Yasuyuki KOZAKAI | 5208806 | 2007-07-24 05:44:11 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2000-2006 by the netfilter coreteam <coreteam@netfilter.org>: |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
Jan Engelhardt | 3c87101 | 2011-06-24 20:16:48 +0200 | [diff] [blame] | 18 | #include "config.h" |
Jan Engelhardt | d61b02f | 2011-05-20 16:26:04 +0200 | [diff] [blame] | 19 | #include <ctype.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 20 | #include <errno.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 21 | #include <fcntl.h> |
Jan Engelhardt | 0b7a140 | 2011-05-24 02:30:23 +0200 | [diff] [blame] | 22 | #include <inttypes.h> |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 23 | #include <netdb.h> |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 24 | #include <stdarg.h> |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 25 | #include <stdbool.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 28 | #include <string.h> |
| 29 | #include <unistd.h> |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 30 | #include <sys/socket.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 31 | #include <sys/stat.h> |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 32 | #include <sys/statfs.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 33 | #include <sys/types.h> |
Jan Engelhardt | f56b8a8 | 2011-09-03 14:27:55 +0200 | [diff] [blame] | 34 | #include <sys/utsname.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 35 | #include <sys/wait.h> |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 36 | #include <arpa/inet.h> |
Jan Engelhardt | 3c87101 | 2011-06-24 20:16:48 +0200 | [diff] [blame] | 37 | #if defined(HAVE_LINUX_MAGIC_H) |
| 38 | # include <linux/magic.h> /* for PROC_SUPER_MAGIC */ |
| 39 | #elif defined(HAVE_LINUX_PROC_FS_H) |
| 40 | # include <linux/proc_fs.h> /* Linux 2.4 */ |
Jan Engelhardt | 41a9b48 | 2011-08-01 20:14:57 +0200 | [diff] [blame] | 41 | #else |
| 42 | # define PROC_SUPER_MAGIC 0x9fa0 |
Jan Engelhardt | 3c87101 | 2011-06-24 20:16:48 +0200 | [diff] [blame] | 43 | #endif |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 44 | |
Yasuyuki KOZAKAI | 5208806 | 2007-07-24 05:44:11 +0000 | [diff] [blame] | 45 | #include <xtables.h> |
Jan Engelhardt | 4e41854 | 2009-02-21 03:46:37 +0100 | [diff] [blame] | 46 | #include <limits.h> /* INT_MAX in ip_tables.h/ip6_tables.h */ |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 47 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 48 | #include <linux/netfilter_ipv6/ip6_tables.h> |
Jan Engelhardt | ef18e81 | 2008-08-04 12:47:48 +0200 | [diff] [blame] | 49 | #include <libiptc/libxtc.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 50 | |
Mike Frysinger | 5a26b5f | 2007-12-19 14:51:17 +0000 | [diff] [blame] | 51 | #ifndef NO_SHARED_LIBS |
| 52 | #include <dlfcn.h> |
| 53 | #endif |
Jan Engelhardt | c31870f | 2009-02-10 10:48:28 +0100 | [diff] [blame] | 54 | #ifndef IPT_SO_GET_REVISION_MATCH /* Old kernel source. */ |
| 55 | # define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) |
| 56 | # define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) |
| 57 | #endif |
| 58 | #ifndef IP6T_SO_GET_REVISION_MATCH /* Old kernel source. */ |
| 59 | # define IP6T_SO_GET_REVISION_MATCH 68 |
| 60 | # define IP6T_SO_GET_REVISION_TARGET 69 |
| 61 | #endif |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 62 | #include <getopt.h> |
Jan Engelhardt | aa37acc | 2011-02-07 04:00:50 +0100 | [diff] [blame] | 63 | #include "iptables/internal.h" |
Jan Engelhardt | 1e128bd | 2011-01-08 02:25:28 +0100 | [diff] [blame] | 64 | #include "xshared.h" |
Mike Frysinger | 5a26b5f | 2007-12-19 14:51:17 +0000 | [diff] [blame] | 65 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 66 | #define NPROTO 255 |
| 67 | |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 68 | #ifndef PROC_SYS_MODPROBE |
| 69 | #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" |
| 70 | #endif |
| 71 | |
Maciej Zenczykowski | 37911de | 2011-04-05 12:42:37 +0200 | [diff] [blame] | 72 | /* we need this for ip6?tables-restore. ip6?tables-restore.c sets line to the |
| 73 | * current line of the input file, in order to give a more precise error |
| 74 | * message. ip6?tables itself doesn't need this, so it is initialized to the |
| 75 | * magic number of -1 */ |
| 76 | int line = -1; |
| 77 | |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 78 | void basic_exit_err(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); |
| 79 | |
Jamal Hadi Salim | 40a8343 | 2009-02-11 13:02:21 +0100 | [diff] [blame] | 80 | struct xtables_globals *xt_params = NULL; |
| 81 | |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 82 | void basic_exit_err(enum xtables_exittype status, const char *msg, ...) |
Jamal Hadi Salim | 40a8343 | 2009-02-11 13:02:21 +0100 | [diff] [blame] | 83 | { |
| 84 | va_list args; |
| 85 | |
| 86 | va_start(args, msg); |
| 87 | fprintf(stderr, "%s v%s: ", xt_params->program_name, xt_params->program_version); |
| 88 | vfprintf(stderr, msg, args); |
| 89 | va_end(args); |
| 90 | fprintf(stderr, "\n"); |
| 91 | exit(status); |
| 92 | } |
| 93 | |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 94 | void xtables_free_opts(int unused) |
Jamal Hadi Salim | 84c3055 | 2009-02-11 13:00:02 +0100 | [diff] [blame] | 95 | { |
Jan Engelhardt | df28823 | 2011-01-31 02:33:43 +0100 | [diff] [blame] | 96 | if (xt_params->opts != xt_params->orig_opts) { |
Jan Engelhardt | 59e8114 | 2010-11-15 13:19:48 +0100 | [diff] [blame] | 97 | free(xt_params->opts); |
Jan Engelhardt | df28823 | 2011-01-31 02:33:43 +0100 | [diff] [blame] | 98 | xt_params->opts = NULL; |
| 99 | } |
Jamal Hadi Salim | 84c3055 | 2009-02-11 13:00:02 +0100 | [diff] [blame] | 100 | } |
| 101 | |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 102 | struct option *xtables_merge_options(struct option *orig_opts, |
| 103 | struct option *oldopts, |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 104 | const struct option *newopts, |
| 105 | unsigned int *option_offset) |
| 106 | { |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 107 | unsigned int num_oold = 0, num_old = 0, num_new = 0, i; |
| 108 | struct option *merge, *mp; |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 109 | |
| 110 | if (newopts == NULL) |
| 111 | return oldopts; |
| 112 | |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 113 | for (num_oold = 0; orig_opts[num_oold].name; num_oold++) ; |
| 114 | if (oldopts != NULL) |
| 115 | for (num_old = 0; oldopts[num_old].name; num_old++) ; |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 116 | for (num_new = 0; newopts[num_new].name; num_new++) ; |
| 117 | |
Jan Engelhardt | 1dc2739 | 2011-01-08 02:10:52 +0100 | [diff] [blame] | 118 | /* |
| 119 | * Since @oldopts also has @orig_opts already (and does so at the |
| 120 | * start), skip these entries. |
| 121 | */ |
| 122 | oldopts += num_oold; |
| 123 | num_old -= num_oold; |
| 124 | |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 125 | merge = malloc(sizeof(*mp) * (num_oold + num_old + num_new + 1)); |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 126 | if (merge == NULL) |
| 127 | return NULL; |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 128 | |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 129 | /* Let the base options -[ADI...] have precedence over everything */ |
| 130 | memcpy(merge, orig_opts, sizeof(*mp) * num_oold); |
| 131 | mp = merge + num_oold; |
| 132 | |
| 133 | /* Second, the new options */ |
Jan Engelhardt | 1e128bd | 2011-01-08 02:25:28 +0100 | [diff] [blame] | 134 | xt_params->option_offset += XT_OPTION_OFFSET_SCALE; |
Jan Engelhardt | 600f38d | 2010-10-29 18:57:42 +0200 | [diff] [blame] | 135 | *option_offset = xt_params->option_offset; |
| 136 | memcpy(mp, newopts, sizeof(*mp) * num_new); |
| 137 | |
| 138 | for (i = 0; i < num_new; ++i, ++mp) |
| 139 | mp->val += *option_offset; |
| 140 | |
| 141 | /* Third, the old options */ |
| 142 | memcpy(mp, oldopts, sizeof(*mp) * num_old); |
| 143 | mp += num_old; |
| 144 | xtables_free_opts(0); |
| 145 | |
| 146 | /* Clear trailing entry */ |
| 147 | memset(mp, 0, sizeof(*mp)); |
Jamal Hadi Salim | 7058192 | 2009-02-13 08:36:44 -0500 | [diff] [blame] | 148 | return merge; |
| 149 | } |
| 150 | |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 151 | static const struct xtables_afinfo afinfo_ipv4 = { |
| 152 | .kmod = "ip_tables", |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 153 | .proc_exists = "/proc/net/ip_tables_names", |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 154 | .libprefix = "libipt_", |
| 155 | .family = NFPROTO_IPV4, |
| 156 | .ipproto = IPPROTO_IP, |
| 157 | .so_rev_match = IPT_SO_GET_REVISION_MATCH, |
| 158 | .so_rev_target = IPT_SO_GET_REVISION_TARGET, |
| 159 | }; |
| 160 | |
| 161 | static const struct xtables_afinfo afinfo_ipv6 = { |
| 162 | .kmod = "ip6_tables", |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 163 | .proc_exists = "/proc/net/ip6_tables_names", |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 164 | .libprefix = "libip6t_", |
| 165 | .family = NFPROTO_IPV6, |
| 166 | .ipproto = IPPROTO_IPV6, |
| 167 | .so_rev_match = IP6T_SO_GET_REVISION_MATCH, |
| 168 | .so_rev_target = IP6T_SO_GET_REVISION_TARGET, |
| 169 | }; |
| 170 | |
Jan Engelhardt | aa37acc | 2011-02-07 04:00:50 +0100 | [diff] [blame] | 171 | const struct xtables_afinfo *afinfo; |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 172 | |
Jan Engelhardt | 39bf9c8 | 2009-01-27 15:59:06 +0100 | [diff] [blame] | 173 | /* Search path for Xtables .so files */ |
| 174 | static const char *xtables_libdir; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 175 | |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 176 | /* the path to command to load kernel module */ |
Jan Engelhardt | c021c3c | 2009-01-27 15:10:05 +0100 | [diff] [blame] | 177 | const char *xtables_modprobe_program; |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 178 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 179 | /* Keep track of matches/targets pending full registration: linked lists. */ |
| 180 | struct xtables_match *xtables_pending_matches; |
| 181 | struct xtables_target *xtables_pending_targets; |
| 182 | |
| 183 | /* Keep track of fully registered external matches/targets: linked lists. */ |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 184 | struct xtables_match *xtables_matches; |
| 185 | struct xtables_target *xtables_targets; |
| 186 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 187 | /* Fully register a match/target which was previously partially registered. */ |
| 188 | static void xtables_fully_register_pending_match(struct xtables_match *me); |
| 189 | static void xtables_fully_register_pending_target(struct xtables_target *me); |
| 190 | |
Jan Engelhardt | 39bf9c8 | 2009-01-27 15:59:06 +0100 | [diff] [blame] | 191 | void xtables_init(void) |
| 192 | { |
| 193 | xtables_libdir = getenv("XTABLES_LIBDIR"); |
| 194 | if (xtables_libdir != NULL) |
| 195 | return; |
| 196 | xtables_libdir = getenv("IPTABLES_LIB_DIR"); |
| 197 | if (xtables_libdir != NULL) { |
| 198 | fprintf(stderr, "IPTABLES_LIB_DIR is deprecated, " |
| 199 | "use XTABLES_LIBDIR.\n"); |
| 200 | return; |
| 201 | } |
Jan Engelhardt | ec93419 | 2009-02-10 09:54:04 +0100 | [diff] [blame] | 202 | /* |
| 203 | * Well yes, IP6TABLES_LIB_DIR is of lower priority over |
| 204 | * IPTABLES_LIB_DIR since this moved to libxtables; I think that is ok |
| 205 | * for these env vars are deprecated anyhow, and in light of the |
| 206 | * (shared) libxt_*.so files, makes less sense to have |
| 207 | * IPTABLES_LIB_DIR != IP6TABLES_LIB_DIR. |
| 208 | */ |
| 209 | xtables_libdir = getenv("IP6TABLES_LIB_DIR"); |
| 210 | if (xtables_libdir != NULL) { |
| 211 | fprintf(stderr, "IP6TABLES_LIB_DIR is deprecated, " |
| 212 | "use XTABLES_LIBDIR.\n"); |
| 213 | return; |
| 214 | } |
Jan Engelhardt | 39bf9c8 | 2009-01-27 15:59:06 +0100 | [diff] [blame] | 215 | xtables_libdir = XTABLES_LIBDIR; |
| 216 | } |
| 217 | |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 218 | void xtables_set_nfproto(uint8_t nfproto) |
| 219 | { |
| 220 | switch (nfproto) { |
| 221 | case NFPROTO_IPV4: |
| 222 | afinfo = &afinfo_ipv4; |
| 223 | break; |
| 224 | case NFPROTO_IPV6: |
| 225 | afinfo = &afinfo_ipv6; |
| 226 | break; |
| 227 | default: |
| 228 | fprintf(stderr, "libxtables: unhandled NFPROTO in %s\n", |
| 229 | __func__); |
| 230 | } |
| 231 | } |
| 232 | |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 233 | /** |
Jamal Hadi Salim | 7e4db2f | 2009-02-13 09:14:17 -0500 | [diff] [blame] | 234 | * xtables_set_params - set the global parameters used by xtables |
| 235 | * @xtp: input xtables_globals structure |
| 236 | * |
| 237 | * The app is expected to pass a valid xtables_globals data-filled |
| 238 | * with proper values |
| 239 | * @xtp cannot be NULL |
| 240 | * |
| 241 | * Returns -1 on failure to set and 0 on success |
| 242 | */ |
| 243 | int xtables_set_params(struct xtables_globals *xtp) |
| 244 | { |
| 245 | if (!xtp) { |
| 246 | fprintf(stderr, "%s: Illegal global params\n",__func__); |
| 247 | return -1; |
| 248 | } |
| 249 | |
| 250 | xt_params = xtp; |
| 251 | |
| 252 | if (!xt_params->exit_err) |
| 253 | xt_params->exit_err = basic_exit_err; |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | int xtables_init_all(struct xtables_globals *xtp, uint8_t nfproto) |
| 259 | { |
| 260 | xtables_init(); |
| 261 | xtables_set_nfproto(nfproto); |
| 262 | return xtables_set_params(xtp); |
| 263 | } |
| 264 | |
| 265 | /** |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 266 | * xtables_*alloc - wrappers that exit on failure |
| 267 | */ |
| 268 | void *xtables_calloc(size_t count, size_t size) |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 269 | { |
| 270 | void *p; |
| 271 | |
| 272 | if ((p = calloc(count, size)) == NULL) { |
| 273 | perror("ip[6]tables: calloc failed"); |
| 274 | exit(1); |
| 275 | } |
| 276 | |
| 277 | return p; |
| 278 | } |
| 279 | |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 280 | void *xtables_malloc(size_t size) |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 281 | { |
| 282 | void *p; |
| 283 | |
| 284 | if ((p = malloc(size)) == NULL) { |
| 285 | perror("ip[6]tables: malloc failed"); |
| 286 | exit(1); |
| 287 | } |
| 288 | |
| 289 | return p; |
| 290 | } |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 291 | |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 292 | void *xtables_realloc(void *ptr, size_t size) |
| 293 | { |
| 294 | void *p; |
| 295 | |
| 296 | if ((p = realloc(ptr, size)) == NULL) { |
| 297 | perror("ip[6]tables: realloc failed"); |
| 298 | exit(1); |
| 299 | } |
| 300 | |
| 301 | return p; |
| 302 | } |
| 303 | |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 304 | static char *get_modprobe(void) |
| 305 | { |
| 306 | int procfile; |
| 307 | char *ret; |
| 308 | |
| 309 | #define PROCFILE_BUFSIZ 1024 |
| 310 | procfile = open(PROC_SYS_MODPROBE, O_RDONLY); |
| 311 | if (procfile < 0) |
| 312 | return NULL; |
Maciej Zenczykowski | a239728 | 2011-04-04 15:30:32 +0200 | [diff] [blame] | 313 | if (fcntl(procfile, F_SETFD, FD_CLOEXEC) == -1) { |
| 314 | fprintf(stderr, "Could not set close on exec: %s\n", |
| 315 | strerror(errno)); |
| 316 | exit(1); |
| 317 | } |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 318 | |
Jan Engelhardt | 371cea2 | 2010-07-25 23:36:17 +0200 | [diff] [blame] | 319 | ret = malloc(PROCFILE_BUFSIZ); |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 320 | if (ret) { |
| 321 | memset(ret, 0, PROCFILE_BUFSIZ); |
| 322 | switch (read(procfile, ret, PROCFILE_BUFSIZ)) { |
| 323 | case -1: goto fail; |
| 324 | case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */ |
| 325 | } |
| 326 | if (ret[strlen(ret)-1]=='\n') |
| 327 | ret[strlen(ret)-1]=0; |
| 328 | close(procfile); |
| 329 | return ret; |
| 330 | } |
| 331 | fail: |
| 332 | free(ret); |
| 333 | close(procfile); |
| 334 | return NULL; |
| 335 | } |
| 336 | |
Jan Engelhardt | c021c3c | 2009-01-27 15:10:05 +0100 | [diff] [blame] | 337 | int xtables_insmod(const char *modname, const char *modprobe, bool quiet) |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 338 | { |
| 339 | char *buf = NULL; |
| 340 | char *argv[4]; |
| 341 | int status; |
| 342 | |
| 343 | /* If they don't explicitly set it, read out of kernel */ |
| 344 | if (!modprobe) { |
| 345 | buf = get_modprobe(); |
| 346 | if (!buf) |
| 347 | return -1; |
| 348 | modprobe = buf; |
| 349 | } |
| 350 | |
Jan Engelhardt | c19f880 | 2009-02-12 01:28:35 +0100 | [diff] [blame] | 351 | /* |
| 352 | * Need to flush the buffer, or the child may output it again |
| 353 | * when switching the program thru execv. |
| 354 | */ |
| 355 | fflush(stdout); |
| 356 | |
Jan Engelhardt | 94aa2ea | 2009-10-11 03:56:18 -0400 | [diff] [blame] | 357 | switch (vfork()) { |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 358 | case 0: |
| 359 | argv[0] = (char *)modprobe; |
| 360 | argv[1] = (char *)modname; |
| 361 | if (quiet) { |
| 362 | argv[2] = "-q"; |
| 363 | argv[3] = NULL; |
| 364 | } else { |
| 365 | argv[2] = NULL; |
| 366 | argv[3] = NULL; |
| 367 | } |
| 368 | execv(argv[0], argv); |
| 369 | |
| 370 | /* not usually reached */ |
| 371 | exit(1); |
| 372 | case -1: |
Jiri Popelka | f53710b | 2011-06-10 15:26:02 +0200 | [diff] [blame] | 373 | free(buf); |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 374 | return -1; |
| 375 | |
| 376 | default: /* parent */ |
| 377 | wait(&status); |
| 378 | } |
| 379 | |
| 380 | free(buf); |
| 381 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
| 382 | return 0; |
| 383 | return -1; |
| 384 | } |
| 385 | |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 386 | /* return true if a given file exists within procfs */ |
| 387 | static bool proc_file_exists(const char *filename) |
| 388 | { |
| 389 | struct stat s; |
| 390 | struct statfs f; |
| 391 | |
| 392 | if (lstat(filename, &s)) |
| 393 | return false; |
| 394 | if (!S_ISREG(s.st_mode)) |
| 395 | return false; |
| 396 | if (statfs(filename, &f)) |
| 397 | return false; |
| 398 | if (f.f_type != PROC_SUPER_MAGIC) |
| 399 | return false; |
| 400 | return true; |
| 401 | } |
| 402 | |
Jan Engelhardt | c021c3c | 2009-01-27 15:10:05 +0100 | [diff] [blame] | 403 | int xtables_load_ko(const char *modprobe, bool quiet) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 404 | { |
Jan Engelhardt | c021c3c | 2009-01-27 15:10:05 +0100 | [diff] [blame] | 405 | static bool loaded = false; |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 406 | int ret; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 407 | |
Maciej Zenczykowski | b32b361 | 2011-04-19 09:14:04 +0200 | [diff] [blame] | 408 | if (loaded) |
| 409 | return 0; |
| 410 | |
| 411 | if (proc_file_exists(afinfo->proc_exists)) { |
| 412 | loaded = true; |
| 413 | return 0; |
| 414 | }; |
| 415 | |
| 416 | ret = xtables_insmod(afinfo->kmod, modprobe, quiet); |
| 417 | if (ret == 0) |
| 418 | loaded = true; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 419 | |
| 420 | return ret; |
| 421 | } |
| 422 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 423 | /** |
| 424 | * xtables_strtou{i,l} - string to number conversion |
| 425 | * @s: input string |
| 426 | * @end: like strtoul's "end" pointer |
| 427 | * @value: pointer for result |
| 428 | * @min: minimum accepted value |
| 429 | * @max: maximum accepted value |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 430 | * |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 431 | * If @end is NULL, we assume the caller wants a "strict strtoul", and hence |
| 432 | * "15a" is rejected. |
| 433 | * In either case, the value obtained is compared for min-max compliance. |
| 434 | * Base is always 0, i.e. autodetect depending on @s. |
| 435 | * |
| 436 | * Returns true/false whether number was accepted. On failure, *value has |
| 437 | * undefined contents. |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 438 | */ |
Jan Engelhardt | 0b7a140 | 2011-05-24 02:30:23 +0200 | [diff] [blame] | 439 | bool xtables_strtoul(const char *s, char **end, uintmax_t *value, |
| 440 | uintmax_t min, uintmax_t max) |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 441 | { |
Jan Engelhardt | 0b7a140 | 2011-05-24 02:30:23 +0200 | [diff] [blame] | 442 | uintmax_t v; |
Jan Engelhardt | d61b02f | 2011-05-20 16:26:04 +0200 | [diff] [blame] | 443 | const char *p; |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 444 | char *my_end; |
| 445 | |
| 446 | errno = 0; |
Jan Engelhardt | d61b02f | 2011-05-20 16:26:04 +0200 | [diff] [blame] | 447 | /* Since strtoul allows leading minus, we have to check for ourself. */ |
| 448 | for (p = s; isspace(*p); ++p) |
| 449 | ; |
| 450 | if (*p == '-') |
| 451 | return false; |
Jan Engelhardt | 0b7a140 | 2011-05-24 02:30:23 +0200 | [diff] [blame] | 452 | v = strtoumax(s, &my_end, 0); |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 453 | if (my_end == s) |
| 454 | return false; |
| 455 | if (end != NULL) |
| 456 | *end = my_end; |
| 457 | |
| 458 | if (errno != ERANGE && min <= v && (max == 0 || v <= max)) { |
| 459 | if (value != NULL) |
| 460 | *value = v; |
| 461 | if (end == NULL) |
| 462 | return *my_end == '\0'; |
| 463 | return true; |
| 464 | } |
| 465 | |
| 466 | return false; |
| 467 | } |
| 468 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 469 | bool xtables_strtoui(const char *s, char **end, unsigned int *value, |
| 470 | unsigned int min, unsigned int max) |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 471 | { |
Jan Engelhardt | 0b7a140 | 2011-05-24 02:30:23 +0200 | [diff] [blame] | 472 | uintmax_t v; |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 473 | bool ret; |
| 474 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 475 | ret = xtables_strtoul(s, end, &v, min, max); |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 476 | if (value != NULL) |
| 477 | *value = v; |
| 478 | return ret; |
| 479 | } |
| 480 | |
Jan Engelhardt | aae6be9 | 2009-01-30 04:24:47 +0100 | [diff] [blame] | 481 | int xtables_service_to_port(const char *name, const char *proto) |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 482 | { |
| 483 | struct servent *service; |
| 484 | |
| 485 | if ((service = getservbyname(name, proto)) != NULL) |
| 486 | return ntohs((unsigned short) service->s_port); |
| 487 | |
| 488 | return -1; |
| 489 | } |
| 490 | |
Jan Engelhardt | 7ac4052 | 2011-01-07 12:34:04 +0100 | [diff] [blame] | 491 | uint16_t xtables_parse_port(const char *port, const char *proto) |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 492 | { |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 493 | unsigned int portnum; |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 494 | |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 495 | if (xtables_strtoui(port, NULL, &portnum, 0, UINT16_MAX) || |
Jan Engelhardt | aae6be9 | 2009-01-30 04:24:47 +0100 | [diff] [blame] | 496 | (portnum = xtables_service_to_port(port, proto)) != (unsigned)-1) |
Jan Engelhardt | 213e185 | 2009-01-27 17:24:34 +0100 | [diff] [blame] | 497 | return portnum; |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 498 | |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 499 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 500 | "invalid port/service `%s' specified", port); |
| 501 | } |
| 502 | |
Jan Engelhardt | aae6be9 | 2009-01-30 04:24:47 +0100 | [diff] [blame] | 503 | void xtables_parse_interface(const char *arg, char *vianame, |
| 504 | unsigned char *mask) |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 505 | { |
Jan Engelhardt | fcf5723 | 2010-02-09 15:59:13 +0100 | [diff] [blame] | 506 | unsigned int vialen = strlen(arg); |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 507 | unsigned int i; |
| 508 | |
| 509 | memset(mask, 0, IFNAMSIZ); |
| 510 | memset(vianame, 0, IFNAMSIZ); |
| 511 | |
| 512 | if (vialen + 1 > IFNAMSIZ) |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 513 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 514 | "interface name `%s' must be shorter than IFNAMSIZ" |
| 515 | " (%i)", arg, IFNAMSIZ-1); |
| 516 | |
| 517 | strcpy(vianame, arg); |
Jan Engelhardt | fcf5723 | 2010-02-09 15:59:13 +0100 | [diff] [blame] | 518 | if (vialen == 0) |
Richard Weinberger | 2ca6273 | 2011-08-27 15:32:31 +0200 | [diff] [blame] | 519 | return; |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 520 | else if (vianame[vialen - 1] == '+') { |
| 521 | memset(mask, 0xFF, vialen - 1); |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 522 | /* Don't remove `+' here! -HW */ |
| 523 | } else { |
| 524 | /* Include nul-terminator in match */ |
| 525 | memset(mask, 0xFF, vialen + 1); |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 526 | for (i = 0; vianame[i]; i++) { |
Jan Engelhardt | fcf5723 | 2010-02-09 15:59:13 +0100 | [diff] [blame] | 527 | if (vianame[i] == '/' || |
| 528 | vianame[i] == ' ') { |
Max Kellermann | aae4f82 | 2007-10-17 16:36:49 +0000 | [diff] [blame] | 529 | fprintf(stderr, |
| 530 | "Warning: weird character in interface" |
Jan Engelhardt | fcf5723 | 2010-02-09 15:59:13 +0100 | [diff] [blame] | 531 | " `%s' ('/' and ' ' are not allowed by the kernel).\n", |
Max Kellermann | aae4f82 | 2007-10-17 16:36:49 +0000 | [diff] [blame] | 532 | vianame); |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 533 | break; |
| 534 | } |
| 535 | } |
| 536 | } |
| 537 | } |
| 538 | |
Jan Engelhardt | cb25af8 | 2008-04-14 18:37:57 +0200 | [diff] [blame] | 539 | #ifndef NO_SHARED_LIBS |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 540 | static void *load_extension(const char *search_path, const char *af_prefix, |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 541 | const char *name, bool is_target) |
| 542 | { |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 543 | const char *all_prefixes[] = {"libxt_", af_prefix, NULL}; |
| 544 | const char **prefix; |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 545 | const char *dir = search_path, *next; |
| 546 | void *ptr = NULL; |
| 547 | struct stat sb; |
| 548 | char path[256]; |
| 549 | |
| 550 | do { |
| 551 | next = strchr(dir, ':'); |
| 552 | if (next == NULL) |
| 553 | next = dir + strlen(dir); |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 554 | |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 555 | for (prefix = all_prefixes; *prefix != NULL; ++prefix) { |
| 556 | snprintf(path, sizeof(path), "%.*s/%s%s.so", |
| 557 | (unsigned int)(next - dir), dir, |
| 558 | *prefix, name); |
| 559 | |
| 560 | if (stat(path, &sb) != 0) { |
| 561 | if (errno == ENOENT) |
| 562 | continue; |
| 563 | fprintf(stderr, "%s: %s\n", path, |
| 564 | strerror(errno)); |
| 565 | return NULL; |
| 566 | } |
| 567 | if (dlopen(path, RTLD_NOW) == NULL) { |
| 568 | fprintf(stderr, "%s: %s\n", path, dlerror()); |
| 569 | break; |
| 570 | } |
| 571 | |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 572 | if (is_target) |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 573 | ptr = xtables_find_target(name, XTF_DONT_LOAD); |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 574 | else |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 575 | ptr = xtables_find_match(name, |
| 576 | XTF_DONT_LOAD, NULL); |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 577 | |
| 578 | if (ptr != NULL) |
| 579 | return ptr; |
| 580 | |
| 581 | fprintf(stderr, "%s: no \"%s\" extension found for " |
| 582 | "this protocol\n", path, name); |
| 583 | errno = ENOENT; |
| 584 | return NULL; |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 585 | } |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 586 | dir = next + 1; |
| 587 | } while (*next != '\0'); |
| 588 | |
| 589 | return NULL; |
| 590 | } |
Jan Engelhardt | cb25af8 | 2008-04-14 18:37:57 +0200 | [diff] [blame] | 591 | #endif |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 592 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 593 | struct xtables_match * |
| 594 | xtables_find_match(const char *name, enum xtables_tryload tryload, |
| 595 | struct xtables_rule_match **matches) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 596 | { |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 597 | struct xtables_match **dptr; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 598 | struct xtables_match *ptr; |
| 599 | const char *icmp6 = "icmp6"; |
| 600 | |
Jan Engelhardt | 0cb675b | 2010-06-07 11:50:25 +0200 | [diff] [blame] | 601 | if (strlen(name) >= XT_EXTENSION_MAXNAMELEN) |
Jan Engelhardt | 21d1283 | 2010-03-16 16:49:21 +0100 | [diff] [blame] | 602 | xtables_error(PARAMETER_PROBLEM, |
| 603 | "Invalid match name \"%s\" (%u chars max)", |
Jan Engelhardt | 0cb675b | 2010-06-07 11:50:25 +0200 | [diff] [blame] | 604 | name, XT_EXTENSION_MAXNAMELEN - 1); |
Jan Engelhardt | 21d1283 | 2010-03-16 16:49:21 +0100 | [diff] [blame] | 605 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 606 | /* This is ugly as hell. Nonetheless, there is no way of changing |
| 607 | * this without hurting backwards compatibility */ |
| 608 | if ( (strcmp(name,"icmpv6") == 0) || |
| 609 | (strcmp(name,"ipv6-icmp") == 0) || |
| 610 | (strcmp(name,"icmp6") == 0) ) |
| 611 | name = icmp6; |
| 612 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 613 | /* Trigger delayed initialization */ |
| 614 | for (dptr = &xtables_pending_matches; *dptr; ) { |
| 615 | if (strcmp(name, (*dptr)->name) == 0) { |
| 616 | ptr = *dptr; |
| 617 | *dptr = (*dptr)->next; |
| 618 | ptr->next = NULL; |
| 619 | xtables_fully_register_pending_match(ptr); |
| 620 | } else { |
| 621 | dptr = &((*dptr)->next); |
| 622 | } |
| 623 | } |
| 624 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 625 | for (ptr = xtables_matches; ptr; ptr = ptr->next) { |
| 626 | if (strcmp(name, ptr->name) == 0) { |
| 627 | struct xtables_match *clone; |
| 628 | |
| 629 | /* First match of this type: */ |
| 630 | if (ptr->m == NULL) |
| 631 | break; |
| 632 | |
| 633 | /* Second and subsequent clones */ |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 634 | clone = xtables_malloc(sizeof(struct xtables_match)); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 635 | memcpy(clone, ptr, sizeof(struct xtables_match)); |
Jan Engelhardt | 3eab786 | 2011-07-10 11:47:46 +0200 | [diff] [blame] | 636 | clone->udata = NULL; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 637 | clone->mflags = 0; |
| 638 | /* This is a clone: */ |
| 639 | clone->next = clone; |
| 640 | |
| 641 | ptr = clone; |
| 642 | break; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | #ifndef NO_SHARED_LIBS |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 647 | if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 648 | ptr = load_extension(xtables_libdir, afinfo->libprefix, |
Jan Engelhardt | 39bf9c8 | 2009-01-27 15:59:06 +0100 | [diff] [blame] | 649 | name, false); |
Yasuyuki KOZAKAI | 170af8c | 2007-08-04 05:22:17 +0000 | [diff] [blame] | 650 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 651 | if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 652 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 653 | "Couldn't load match `%s':%s\n", |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 654 | name, strerror(errno)); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 655 | } |
| 656 | #else |
| 657 | if (ptr && !ptr->loaded) { |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 658 | if (tryload != XTF_DONT_LOAD) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 659 | ptr->loaded = 1; |
| 660 | else |
| 661 | ptr = NULL; |
| 662 | } |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 663 | if(!ptr && (tryload == XTF_LOAD_MUST_SUCCEED)) { |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 664 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 665 | "Couldn't find match `%s'\n", name); |
| 666 | } |
| 667 | #endif |
| 668 | |
| 669 | if (ptr && matches) { |
| 670 | struct xtables_rule_match **i; |
| 671 | struct xtables_rule_match *newentry; |
| 672 | |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 673 | newentry = xtables_malloc(sizeof(struct xtables_rule_match)); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 674 | |
| 675 | for (i = matches; *i; i = &(*i)->next) { |
| 676 | if (strcmp(name, (*i)->match->name) == 0) |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 677 | (*i)->completed = true; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 678 | } |
| 679 | newentry->match = ptr; |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 680 | newentry->completed = false; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 681 | newentry->next = NULL; |
| 682 | *i = newentry; |
| 683 | } |
| 684 | |
| 685 | return ptr; |
| 686 | } |
| 687 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 688 | struct xtables_target * |
| 689 | xtables_find_target(const char *name, enum xtables_tryload tryload) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 690 | { |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 691 | struct xtables_target **dptr; |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 692 | struct xtables_target *ptr; |
| 693 | |
| 694 | /* Standard target? */ |
| 695 | if (strcmp(name, "") == 0 |
| 696 | || strcmp(name, XTC_LABEL_ACCEPT) == 0 |
| 697 | || strcmp(name, XTC_LABEL_DROP) == 0 |
| 698 | || strcmp(name, XTC_LABEL_QUEUE) == 0 |
| 699 | || strcmp(name, XTC_LABEL_RETURN) == 0) |
| 700 | name = "standard"; |
| 701 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 702 | /* Trigger delayed initialization */ |
| 703 | for (dptr = &xtables_pending_targets; *dptr; ) { |
| 704 | if (strcmp(name, (*dptr)->name) == 0) { |
| 705 | ptr = *dptr; |
| 706 | *dptr = (*dptr)->next; |
| 707 | ptr->next = NULL; |
| 708 | xtables_fully_register_pending_target(ptr); |
| 709 | } else { |
| 710 | dptr = &((*dptr)->next); |
| 711 | } |
| 712 | } |
| 713 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 714 | for (ptr = xtables_targets; ptr; ptr = ptr->next) { |
| 715 | if (strcmp(name, ptr->name) == 0) |
| 716 | break; |
| 717 | } |
| 718 | |
| 719 | #ifndef NO_SHARED_LIBS |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 720 | if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 721 | ptr = load_extension(xtables_libdir, afinfo->libprefix, |
Jan Engelhardt | 39bf9c8 | 2009-01-27 15:59:06 +0100 | [diff] [blame] | 722 | name, true); |
Yasuyuki KOZAKAI | 170af8c | 2007-08-04 05:22:17 +0000 | [diff] [blame] | 723 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 724 | if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 725 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 726 | "Couldn't load target `%s':%s\n", |
Jan Engelhardt | 9273850 | 2011-01-30 14:18:17 +0100 | [diff] [blame] | 727 | name, strerror(errno)); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 728 | } |
| 729 | #else |
| 730 | if (ptr && !ptr->loaded) { |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 731 | if (tryload != XTF_DONT_LOAD) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 732 | ptr->loaded = 1; |
| 733 | else |
| 734 | ptr = NULL; |
| 735 | } |
Peter Volkov | 854d2d9 | 2009-03-24 11:09:16 +0300 | [diff] [blame] | 736 | if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) { |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 737 | xt_params->exit_err(PARAMETER_PROBLEM, |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 738 | "Couldn't find target `%s'\n", name); |
| 739 | } |
| 740 | #endif |
| 741 | |
| 742 | if (ptr) |
| 743 | ptr->used = 1; |
| 744 | |
| 745 | return ptr; |
| 746 | } |
| 747 | |
Jan Engelhardt | 7ac4052 | 2011-01-07 12:34:04 +0100 | [diff] [blame] | 748 | static int compatible_revision(const char *name, uint8_t revision, int opt) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 749 | { |
| 750 | struct xt_get_revision rev; |
| 751 | socklen_t s = sizeof(rev); |
| 752 | int max_rev, sockfd; |
| 753 | |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 754 | sockfd = socket(afinfo->family, SOCK_RAW, IPPROTO_RAW); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 755 | if (sockfd < 0) { |
Patrick McHardy | df1ef38 | 2007-12-03 15:32:28 +0000 | [diff] [blame] | 756 | if (errno == EPERM) { |
| 757 | /* revision 0 is always supported. */ |
| 758 | if (revision != 0) |
Jan Engelhardt | e1639b0 | 2011-05-05 12:54:52 +0200 | [diff] [blame] | 759 | fprintf(stderr, "%s: Could not determine whether " |
Patrick McHardy | df1ef38 | 2007-12-03 15:32:28 +0000 | [diff] [blame] | 760 | "revision %u is supported, " |
| 761 | "assuming it is.\n", |
Jan Engelhardt | e1639b0 | 2011-05-05 12:54:52 +0200 | [diff] [blame] | 762 | name, revision); |
Patrick McHardy | df1ef38 | 2007-12-03 15:32:28 +0000 | [diff] [blame] | 763 | return 1; |
| 764 | } |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 765 | fprintf(stderr, "Could not open socket to kernel: %s\n", |
| 766 | strerror(errno)); |
| 767 | exit(1); |
| 768 | } |
| 769 | |
Maciej Zenczykowski | a239728 | 2011-04-04 15:30:32 +0200 | [diff] [blame] | 770 | if (fcntl(sockfd, F_SETFD, FD_CLOEXEC) == -1) { |
| 771 | fprintf(stderr, "Could not set close on exec: %s\n", |
| 772 | strerror(errno)); |
| 773 | exit(1); |
| 774 | } |
| 775 | |
Jan Engelhardt | c021c3c | 2009-01-27 15:10:05 +0100 | [diff] [blame] | 776 | xtables_load_ko(xtables_modprobe_program, true); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 777 | |
| 778 | strcpy(rev.name, name); |
| 779 | rev.revision = revision; |
| 780 | |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 781 | max_rev = getsockopt(sockfd, afinfo->ipproto, opt, &rev, &s); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 782 | if (max_rev < 0) { |
| 783 | /* Definitely don't support this? */ |
| 784 | if (errno == ENOENT || errno == EPROTONOSUPPORT) { |
| 785 | close(sockfd); |
| 786 | return 0; |
| 787 | } else if (errno == ENOPROTOOPT) { |
| 788 | close(sockfd); |
| 789 | /* Assume only revision 0 support (old kernel) */ |
| 790 | return (revision == 0); |
| 791 | } else { |
| 792 | fprintf(stderr, "getsockopt failed strangely: %s\n", |
| 793 | strerror(errno)); |
| 794 | exit(1); |
| 795 | } |
| 796 | } |
| 797 | close(sockfd); |
| 798 | return 1; |
| 799 | } |
| 800 | |
| 801 | |
Jan Engelhardt | 7ac4052 | 2011-01-07 12:34:04 +0100 | [diff] [blame] | 802 | static int compatible_match_revision(const char *name, uint8_t revision) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 803 | { |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 804 | return compatible_revision(name, revision, afinfo->so_rev_match); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 805 | } |
| 806 | |
Jan Engelhardt | 7ac4052 | 2011-01-07 12:34:04 +0100 | [diff] [blame] | 807 | static int compatible_target_revision(const char *name, uint8_t revision) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 808 | { |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 809 | return compatible_revision(name, revision, afinfo->so_rev_target); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 810 | } |
| 811 | |
Jan Engelhardt | dfbedfe | 2011-01-08 03:31:04 +0100 | [diff] [blame] | 812 | static void xtables_check_options(const char *name, const struct option *opt) |
| 813 | { |
| 814 | for (; opt->name != NULL; ++opt) |
| 815 | if (opt->val < 0 || opt->val >= XT_OPTION_OFFSET_SCALE) { |
| 816 | fprintf(stderr, "%s: Extension %s uses invalid " |
| 817 | "option value %d\n",xt_params->program_name, |
| 818 | name, opt->val); |
| 819 | exit(1); |
| 820 | } |
| 821 | } |
| 822 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 823 | void xtables_register_match(struct xtables_match *me) |
| 824 | { |
Jan Engelhardt | c284de5 | 2009-06-25 21:25:24 +0200 | [diff] [blame] | 825 | if (me->version == NULL) { |
| 826 | fprintf(stderr, "%s: match %s<%u> is missing a version\n", |
| 827 | xt_params->program_name, me->name, me->revision); |
| 828 | exit(1); |
| 829 | } |
Jan Engelhardt | dacafa5 | 2009-01-27 20:56:23 +0100 | [diff] [blame] | 830 | if (strcmp(me->version, XTABLES_VERSION) != 0) { |
| 831 | fprintf(stderr, "%s: match \"%s\" has version \"%s\", " |
| 832 | "but \"%s\" is required.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 833 | xt_params->program_name, me->name, |
Jan Engelhardt | dacafa5 | 2009-01-27 20:56:23 +0100 | [diff] [blame] | 834 | me->version, XTABLES_VERSION); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 835 | exit(1); |
| 836 | } |
| 837 | |
Jan Engelhardt | 0cb675b | 2010-06-07 11:50:25 +0200 | [diff] [blame] | 838 | if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { |
Li Yewang | 281439b | 2011-01-09 22:26:58 +0100 | [diff] [blame] | 839 | fprintf(stderr, "%s: match `%s' has invalid name\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 840 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 841 | exit(1); |
| 842 | } |
| 843 | |
| 844 | if (me->family >= NPROTO) { |
| 845 | fprintf(stderr, |
| 846 | "%s: BUG: match %s has invalid protocol family\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 847 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 848 | exit(1); |
| 849 | } |
| 850 | |
Jan Engelhardt | aa37acc | 2011-02-07 04:00:50 +0100 | [diff] [blame] | 851 | if (me->x6_options != NULL) |
| 852 | xtables_option_metavalidate(me->name, me->x6_options); |
Jan Engelhardt | dfbedfe | 2011-01-08 03:31:04 +0100 | [diff] [blame] | 853 | if (me->extra_opts != NULL) |
| 854 | xtables_check_options(me->name, me->extra_opts); |
| 855 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 856 | /* ignore not interested match */ |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 857 | if (me->family != afinfo->family && me->family != AF_UNSPEC) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 858 | return; |
| 859 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 860 | /* place on linked list of matches pending full registration */ |
| 861 | me->next = xtables_pending_matches; |
| 862 | xtables_pending_matches = me; |
| 863 | } |
| 864 | |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 865 | /** |
| 866 | * Compare two actions for their preference |
| 867 | * @a: one action |
| 868 | * @b: another |
| 869 | * |
| 870 | * Like strcmp, returns a negative number if @a is less preferred than @b, |
| 871 | * positive number if @a is more preferred than @b, or zero if equally |
| 872 | * preferred. |
| 873 | */ |
| 874 | static int |
Jan Engelhardt | cd2f9bd | 2012-09-04 05:24:47 +0200 | [diff] [blame] | 875 | xtables_mt_prefer(bool a_alias, unsigned int a_rev, unsigned int a_fam, |
| 876 | bool b_alias, unsigned int b_rev, unsigned int b_fam) |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 877 | { |
Jan Engelhardt | cd2f9bd | 2012-09-04 05:24:47 +0200 | [diff] [blame] | 878 | /* |
| 879 | * Alias ranks higher than no alias. |
| 880 | * (We want the new action to be used whenever possible.) |
| 881 | */ |
| 882 | if (!a_alias && b_alias) |
| 883 | return -1; |
| 884 | if (a_alias && !b_alias) |
| 885 | return 1; |
| 886 | |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 887 | /* Higher revision ranks higher. */ |
| 888 | if (a_rev < b_rev) |
| 889 | return -1; |
| 890 | if (a_rev > b_rev) |
| 891 | return 1; |
| 892 | |
| 893 | /* NFPROTO_<specific> ranks higher than NFPROTO_UNSPEC. */ |
| 894 | if (a_fam == NFPROTO_UNSPEC && b_fam != NFPROTO_UNSPEC) |
| 895 | return -1; |
| 896 | if (a_fam != NFPROTO_UNSPEC && b_fam == NFPROTO_UNSPEC) |
| 897 | return 1; |
| 898 | |
| 899 | /* Must be the same thing. */ |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | static int xtables_match_prefer(const struct xtables_match *a, |
| 904 | const struct xtables_match *b) |
| 905 | { |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 906 | return xtables_mt_prefer(a->real_name != NULL, |
Jan Engelhardt | c436dad | 2012-09-27 23:48:25 +0200 | [diff] [blame] | 907 | a->revision, a->family, |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 908 | b->real_name != NULL, |
Jan Engelhardt | c436dad | 2012-09-27 23:48:25 +0200 | [diff] [blame] | 909 | b->revision, b->family); |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | static int xtables_target_prefer(const struct xtables_target *a, |
| 913 | const struct xtables_target *b) |
| 914 | { |
Jan Engelhardt | cd2f9bd | 2012-09-04 05:24:47 +0200 | [diff] [blame] | 915 | /* |
| 916 | * Note that if x->real_name==NULL, it will be set to x->name in |
| 917 | * xtables_register_*; the direct pointer comparison here is therefore |
| 918 | * legitimate to detect an alias. |
| 919 | */ |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 920 | return xtables_mt_prefer(a->real_name != NULL, |
Jan Engelhardt | cd2f9bd | 2012-09-04 05:24:47 +0200 | [diff] [blame] | 921 | a->revision, a->family, |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 922 | b->real_name != NULL, |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 923 | b->revision, b->family); |
| 924 | } |
| 925 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 926 | static void xtables_fully_register_pending_match(struct xtables_match *me) |
| 927 | { |
| 928 | struct xtables_match **i, *old; |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 929 | const char *rn; |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 930 | int compare; |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 931 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 932 | old = xtables_find_match(me->name, XTF_DURING_LOAD, NULL); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 933 | if (old) { |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 934 | compare = xtables_match_prefer(old, me); |
| 935 | if (compare == 0) { |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 936 | fprintf(stderr, |
| 937 | "%s: match `%s' already registered.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 938 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 939 | exit(1); |
| 940 | } |
| 941 | |
| 942 | /* Now we have two (or more) options, check compatibility. */ |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 943 | rn = (old->real_name != NULL) ? old->real_name : old->name; |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 944 | if (compare > 0 && |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 945 | compatible_match_revision(rn, old->revision)) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 946 | return; |
| 947 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 948 | /* See if new match can be used. */ |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 949 | rn = (me->real_name != NULL) ? me->real_name : me->name; |
| 950 | if (!compatible_match_revision(rn, me->revision)) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 951 | return; |
| 952 | |
| 953 | /* Delete old one. */ |
| 954 | for (i = &xtables_matches; *i!=old; i = &(*i)->next); |
| 955 | *i = old->next; |
| 956 | } |
| 957 | |
| 958 | if (me->size != XT_ALIGN(me->size)) { |
| 959 | fprintf(stderr, "%s: match `%s' has invalid size %u.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 960 | xt_params->program_name, me->name, |
| 961 | (unsigned int)me->size); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 962 | exit(1); |
| 963 | } |
| 964 | |
| 965 | /* Append to list. */ |
| 966 | for (i = &xtables_matches; *i; i = &(*i)->next); |
| 967 | me->next = NULL; |
| 968 | *i = me; |
| 969 | |
| 970 | me->m = NULL; |
| 971 | me->mflags = 0; |
| 972 | } |
| 973 | |
Jan Engelhardt | 9a8fc4f | 2009-06-25 17:13:46 +0200 | [diff] [blame] | 974 | void xtables_register_matches(struct xtables_match *match, unsigned int n) |
| 975 | { |
| 976 | do { |
| 977 | xtables_register_match(&match[--n]); |
| 978 | } while (n > 0); |
| 979 | } |
| 980 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 981 | void xtables_register_target(struct xtables_target *me) |
| 982 | { |
Jan Engelhardt | c284de5 | 2009-06-25 21:25:24 +0200 | [diff] [blame] | 983 | if (me->version == NULL) { |
| 984 | fprintf(stderr, "%s: target %s<%u> is missing a version\n", |
| 985 | xt_params->program_name, me->name, me->revision); |
| 986 | exit(1); |
| 987 | } |
Jan Engelhardt | dacafa5 | 2009-01-27 20:56:23 +0100 | [diff] [blame] | 988 | if (strcmp(me->version, XTABLES_VERSION) != 0) { |
| 989 | fprintf(stderr, "%s: target \"%s\" has version \"%s\", " |
| 990 | "but \"%s\" is required.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 991 | xt_params->program_name, me->name, |
Jan Engelhardt | dacafa5 | 2009-01-27 20:56:23 +0100 | [diff] [blame] | 992 | me->version, XTABLES_VERSION); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 993 | exit(1); |
| 994 | } |
| 995 | |
Jan Engelhardt | 0cb675b | 2010-06-07 11:50:25 +0200 | [diff] [blame] | 996 | if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 997 | fprintf(stderr, "%s: target `%s' has invalid name\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 998 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 999 | exit(1); |
| 1000 | } |
| 1001 | |
| 1002 | if (me->family >= NPROTO) { |
| 1003 | fprintf(stderr, |
| 1004 | "%s: BUG: target %s has invalid protocol family\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 1005 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1006 | exit(1); |
| 1007 | } |
| 1008 | |
Jan Engelhardt | aa37acc | 2011-02-07 04:00:50 +0100 | [diff] [blame] | 1009 | if (me->x6_options != NULL) |
| 1010 | xtables_option_metavalidate(me->name, me->x6_options); |
Jan Engelhardt | dfbedfe | 2011-01-08 03:31:04 +0100 | [diff] [blame] | 1011 | if (me->extra_opts != NULL) |
| 1012 | xtables_check_options(me->name, me->extra_opts); |
| 1013 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1014 | /* ignore not interested target */ |
Jan Engelhardt | 77f48c2 | 2009-02-07 19:59:53 +0100 | [diff] [blame] | 1015 | if (me->family != afinfo->family && me->family != AF_UNSPEC) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1016 | return; |
| 1017 | |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 1018 | /* place on linked list of targets pending full registration */ |
| 1019 | me->next = xtables_pending_targets; |
| 1020 | xtables_pending_targets = me; |
| 1021 | } |
| 1022 | |
| 1023 | static void xtables_fully_register_pending_target(struct xtables_target *me) |
| 1024 | { |
| 1025 | struct xtables_target *old; |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 1026 | const char *rn; |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 1027 | int compare; |
Maciej Zenczykowski | 2c6ac07 | 2011-04-04 15:31:43 +0200 | [diff] [blame] | 1028 | |
Jan Engelhardt | 2338efd | 2009-01-27 15:23:01 +0100 | [diff] [blame] | 1029 | old = xtables_find_target(me->name, XTF_DURING_LOAD); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1030 | if (old) { |
| 1031 | struct xtables_target **i; |
| 1032 | |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 1033 | compare = xtables_target_prefer(old, me); |
| 1034 | if (compare == 0) { |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1035 | fprintf(stderr, |
| 1036 | "%s: target `%s' already registered.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 1037 | xt_params->program_name, me->name); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1038 | exit(1); |
| 1039 | } |
| 1040 | |
| 1041 | /* Now we have two (or more) options, check compatibility. */ |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 1042 | rn = (old->real_name != NULL) ? old->real_name : old->name; |
Jan Engelhardt | 954b76c | 2012-09-27 21:36:35 +0200 | [diff] [blame] | 1043 | if (compare > 0 && |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 1044 | compatible_target_revision(rn, old->revision)) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1045 | return; |
| 1046 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 1047 | /* See if new target can be used. */ |
Jan Engelhardt | dd43527 | 2012-10-07 14:32:36 +0000 | [diff] [blame^] | 1048 | rn = (me->real_name != NULL) ? me->real_name : me->name; |
| 1049 | if (!compatible_target_revision(rn, me->revision)) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1050 | return; |
| 1051 | |
| 1052 | /* Delete old one. */ |
| 1053 | for (i = &xtables_targets; *i!=old; i = &(*i)->next); |
| 1054 | *i = old->next; |
| 1055 | } |
| 1056 | |
| 1057 | if (me->size != XT_ALIGN(me->size)) { |
| 1058 | fprintf(stderr, "%s: target `%s' has invalid size %u.\n", |
Jamal Hadi Salim | 5dd19de | 2009-02-13 10:42:24 -0500 | [diff] [blame] | 1059 | xt_params->program_name, me->name, |
| 1060 | (unsigned int)me->size); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 1061 | exit(1); |
| 1062 | } |
| 1063 | |
| 1064 | /* Prepend to list. */ |
| 1065 | me->next = xtables_targets; |
| 1066 | xtables_targets = me; |
| 1067 | me->t = NULL; |
| 1068 | me->tflags = 0; |
| 1069 | } |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1070 | |
Jan Engelhardt | 9a8fc4f | 2009-06-25 17:13:46 +0200 | [diff] [blame] | 1071 | void xtables_register_targets(struct xtables_target *target, unsigned int n) |
| 1072 | { |
| 1073 | do { |
| 1074 | xtables_register_target(&target[--n]); |
| 1075 | } while (n > 0); |
| 1076 | } |
| 1077 | |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 1078 | /** |
| 1079 | * xtables_param_act - act on condition |
| 1080 | * @status: a constant from enum xtables_exittype |
| 1081 | * |
| 1082 | * %XTF_ONLY_ONCE: print error message that option may only be used once. |
| 1083 | * @p1: module name (e.g. "mark") |
| 1084 | * @p2(...): option in conflict (e.g. "--mark") |
| 1085 | * @p3(...): condition to match on (see extensions/ for examples) |
| 1086 | * |
| 1087 | * %XTF_NO_INVERT: option does not support inversion |
| 1088 | * @p1: module name |
| 1089 | * @p2: option in conflict |
| 1090 | * @p3: condition to match on |
| 1091 | * |
| 1092 | * %XTF_BAD_VALUE: bad value for option |
| 1093 | * @p1: module name |
| 1094 | * @p2: option with which the problem occured (e.g. "--mark") |
| 1095 | * @p3: string the user passed in (e.g. "99999999999999") |
| 1096 | * |
| 1097 | * %XTF_ONE_ACTION: two mutually exclusive actions have been specified |
| 1098 | * @p1: module name |
| 1099 | * |
| 1100 | * Displays an error message and exits the program. |
| 1101 | */ |
| 1102 | void xtables_param_act(unsigned int status, const char *p1, ...) |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1103 | { |
| 1104 | const char *p2, *p3; |
| 1105 | va_list args; |
| 1106 | bool b; |
| 1107 | |
| 1108 | va_start(args, p1); |
| 1109 | |
| 1110 | switch (status) { |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 1111 | case XTF_ONLY_ONCE: |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1112 | p2 = va_arg(args, const char *); |
| 1113 | b = va_arg(args, unsigned int); |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1114 | if (!b) { |
| 1115 | va_end(args); |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1116 | return; |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1117 | } |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1118 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1119 | "%s: \"%s\" option may only be specified once", |
| 1120 | p1, p2); |
| 1121 | break; |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 1122 | case XTF_NO_INVERT: |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1123 | p2 = va_arg(args, const char *); |
| 1124 | b = va_arg(args, unsigned int); |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1125 | if (!b) { |
| 1126 | va_end(args); |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1127 | return; |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1128 | } |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1129 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1130 | "%s: \"%s\" option cannot be inverted", p1, p2); |
| 1131 | break; |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 1132 | case XTF_BAD_VALUE: |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1133 | p2 = va_arg(args, const char *); |
| 1134 | p3 = va_arg(args, const char *); |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1135 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1136 | "%s: Bad value for \"%s\" option: \"%s\"", |
| 1137 | p1, p2, p3); |
| 1138 | break; |
Jan Engelhardt | a41545c | 2009-01-27 21:27:19 +0100 | [diff] [blame] | 1139 | case XTF_ONE_ACTION: |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1140 | b = va_arg(args, unsigned int); |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1141 | if (!b) { |
| 1142 | va_end(args); |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1143 | return; |
Jiri Popelka | d010169 | 2011-06-10 15:26:00 +0200 | [diff] [blame] | 1144 | } |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1145 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1146 | "%s: At most one action is possible", p1); |
| 1147 | break; |
| 1148 | default: |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1149 | xt_params->exit_err(status, p1, args); |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 1150 | break; |
| 1151 | } |
| 1152 | |
| 1153 | va_end(args); |
| 1154 | } |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1155 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1156 | const char *xtables_ipaddr_to_numeric(const struct in_addr *addrp) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1157 | { |
| 1158 | static char buf[20]; |
| 1159 | const unsigned char *bytep = (const void *)&addrp->s_addr; |
| 1160 | |
| 1161 | sprintf(buf, "%u.%u.%u.%u", bytep[0], bytep[1], bytep[2], bytep[3]); |
| 1162 | return buf; |
| 1163 | } |
| 1164 | |
| 1165 | static const char *ipaddr_to_host(const struct in_addr *addr) |
| 1166 | { |
| 1167 | struct hostent *host; |
| 1168 | |
| 1169 | host = gethostbyaddr(addr, sizeof(struct in_addr), AF_INET); |
| 1170 | if (host == NULL) |
| 1171 | return NULL; |
| 1172 | |
| 1173 | return host->h_name; |
| 1174 | } |
| 1175 | |
| 1176 | static const char *ipaddr_to_network(const struct in_addr *addr) |
| 1177 | { |
| 1178 | struct netent *net; |
| 1179 | |
| 1180 | if ((net = getnetbyaddr(ntohl(addr->s_addr), AF_INET)) != NULL) |
| 1181 | return net->n_name; |
| 1182 | |
| 1183 | return NULL; |
| 1184 | } |
| 1185 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1186 | const char *xtables_ipaddr_to_anyname(const struct in_addr *addr) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1187 | { |
| 1188 | const char *name; |
| 1189 | |
| 1190 | if ((name = ipaddr_to_host(addr)) != NULL || |
| 1191 | (name = ipaddr_to_network(addr)) != NULL) |
| 1192 | return name; |
| 1193 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1194 | return xtables_ipaddr_to_numeric(addr); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1195 | } |
| 1196 | |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1197 | int xtables_ipmask_to_cidr(const struct in_addr *mask) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1198 | { |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1199 | uint32_t maskaddr, bits; |
| 1200 | int i; |
| 1201 | |
| 1202 | maskaddr = ntohl(mask->s_addr); |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1203 | /* shortcut for /32 networks */ |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1204 | if (maskaddr == 0xFFFFFFFFL) |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1205 | return 32; |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1206 | |
| 1207 | i = 32; |
| 1208 | bits = 0xFFFFFFFEL; |
| 1209 | while (--i >= 0 && maskaddr != bits) |
| 1210 | bits <<= 1; |
| 1211 | if (i >= 0) |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1212 | return i; |
| 1213 | |
| 1214 | /* this mask cannot be converted to CIDR notation */ |
| 1215 | return -1; |
| 1216 | } |
| 1217 | |
| 1218 | const char *xtables_ipmask_to_numeric(const struct in_addr *mask) |
| 1219 | { |
| 1220 | static char buf[20]; |
| 1221 | uint32_t cidr; |
| 1222 | |
| 1223 | cidr = xtables_ipmask_to_cidr(mask); |
| 1224 | if (cidr < 0) { |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1225 | /* mask was not a decent combination of 1's and 0's */ |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1226 | sprintf(buf, "/%s", xtables_ipaddr_to_numeric(mask)); |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1227 | return buf; |
| 1228 | } else if (cidr == 32) { |
| 1229 | /* we don't want to see "/32" */ |
| 1230 | return ""; |
| 1231 | } |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1232 | |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1233 | sprintf(buf, "/%d", cidr); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1234 | return buf; |
| 1235 | } |
| 1236 | |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1237 | static struct in_addr *__numeric_to_ipaddr(const char *dotted, bool is_mask) |
| 1238 | { |
| 1239 | static struct in_addr addr; |
| 1240 | unsigned char *addrp; |
| 1241 | unsigned int onebyte; |
| 1242 | char buf[20], *p, *q; |
| 1243 | int i; |
| 1244 | |
| 1245 | /* copy dotted string, because we need to modify it */ |
| 1246 | strncpy(buf, dotted, sizeof(buf) - 1); |
| 1247 | buf[sizeof(buf) - 1] = '\0'; |
| 1248 | addrp = (void *)&addr.s_addr; |
| 1249 | |
| 1250 | p = buf; |
| 1251 | for (i = 0; i < 3; ++i) { |
| 1252 | if ((q = strchr(p, '.')) == NULL) { |
| 1253 | if (is_mask) |
| 1254 | return NULL; |
| 1255 | |
| 1256 | /* autocomplete, this is a network address */ |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 1257 | if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1258 | return NULL; |
| 1259 | |
| 1260 | addrp[i] = onebyte; |
| 1261 | while (i < 3) |
| 1262 | addrp[++i] = 0; |
| 1263 | |
| 1264 | return &addr; |
| 1265 | } |
| 1266 | |
| 1267 | *q = '\0'; |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 1268 | if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1269 | return NULL; |
| 1270 | |
| 1271 | addrp[i] = onebyte; |
| 1272 | p = q + 1; |
| 1273 | } |
| 1274 | |
| 1275 | /* we have checked 3 bytes, now we check the last one */ |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 1276 | if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1277 | return NULL; |
| 1278 | |
| 1279 | addrp[3] = onebyte; |
| 1280 | return &addr; |
| 1281 | } |
| 1282 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1283 | struct in_addr *xtables_numeric_to_ipaddr(const char *dotted) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1284 | { |
| 1285 | return __numeric_to_ipaddr(dotted, false); |
| 1286 | } |
| 1287 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1288 | struct in_addr *xtables_numeric_to_ipmask(const char *dotted) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1289 | { |
| 1290 | return __numeric_to_ipaddr(dotted, true); |
| 1291 | } |
| 1292 | |
| 1293 | static struct in_addr *network_to_ipaddr(const char *name) |
| 1294 | { |
| 1295 | static struct in_addr addr; |
| 1296 | struct netent *net; |
| 1297 | |
| 1298 | if ((net = getnetbyname(name)) != NULL) { |
| 1299 | if (net->n_addrtype != AF_INET) |
| 1300 | return NULL; |
| 1301 | addr.s_addr = htonl(net->n_net); |
| 1302 | return &addr; |
| 1303 | } |
| 1304 | |
| 1305 | return NULL; |
| 1306 | } |
| 1307 | |
| 1308 | static struct in_addr *host_to_ipaddr(const char *name, unsigned int *naddr) |
| 1309 | { |
| 1310 | struct hostent *host; |
| 1311 | struct in_addr *addr; |
| 1312 | unsigned int i; |
| 1313 | |
| 1314 | *naddr = 0; |
| 1315 | if ((host = gethostbyname(name)) != NULL) { |
| 1316 | if (host->h_addrtype != AF_INET || |
| 1317 | host->h_length != sizeof(struct in_addr)) |
| 1318 | return NULL; |
| 1319 | |
| 1320 | while (host->h_addr_list[*naddr] != NULL) |
| 1321 | ++*naddr; |
Wes Campaigne | 11e250b | 2011-02-21 19:10:11 -0500 | [diff] [blame] | 1322 | addr = xtables_calloc(*naddr, sizeof(struct in_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1323 | for (i = 0; i < *naddr; i++) |
| 1324 | memcpy(&addr[i], host->h_addr_list[i], |
| 1325 | sizeof(struct in_addr)); |
| 1326 | return addr; |
| 1327 | } |
| 1328 | |
| 1329 | return NULL; |
| 1330 | } |
| 1331 | |
| 1332 | static struct in_addr * |
| 1333 | ipparse_hostnetwork(const char *name, unsigned int *naddrs) |
| 1334 | { |
| 1335 | struct in_addr *addrptmp, *addrp; |
| 1336 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1337 | if ((addrptmp = xtables_numeric_to_ipaddr(name)) != NULL || |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1338 | (addrptmp = network_to_ipaddr(name)) != NULL) { |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 1339 | addrp = xtables_malloc(sizeof(struct in_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1340 | memcpy(addrp, addrptmp, sizeof(*addrp)); |
| 1341 | *naddrs = 1; |
| 1342 | return addrp; |
| 1343 | } |
| 1344 | if ((addrptmp = host_to_ipaddr(name, naddrs)) != NULL) |
| 1345 | return addrptmp; |
| 1346 | |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1347 | xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1348 | } |
| 1349 | |
| 1350 | static struct in_addr *parse_ipmask(const char *mask) |
| 1351 | { |
| 1352 | static struct in_addr maskaddr; |
| 1353 | struct in_addr *addrp; |
| 1354 | unsigned int bits; |
| 1355 | |
| 1356 | if (mask == NULL) { |
| 1357 | /* no mask at all defaults to 32 bits */ |
| 1358 | maskaddr.s_addr = 0xFFFFFFFF; |
| 1359 | return &maskaddr; |
| 1360 | } |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1361 | if ((addrp = xtables_numeric_to_ipmask(mask)) != NULL) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1362 | /* dotted_to_addr already returns a network byte order addr */ |
| 1363 | return addrp; |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 1364 | if (!xtables_strtoui(mask, NULL, &bits, 0, 32)) |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1365 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1366 | "invalid mask `%s' specified", mask); |
| 1367 | if (bits != 0) { |
| 1368 | maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits)); |
| 1369 | return &maskaddr; |
| 1370 | } |
| 1371 | |
| 1372 | maskaddr.s_addr = 0U; |
| 1373 | return &maskaddr; |
| 1374 | } |
| 1375 | |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1376 | void xtables_ipparse_multiple(const char *name, struct in_addr **addrpp, |
| 1377 | struct in_addr **maskpp, unsigned int *naddrs) |
| 1378 | { |
| 1379 | struct in_addr *addrp; |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1380 | char buf[256], *p, *next; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1381 | unsigned int len, i, j, n, count = 1; |
| 1382 | const char *loop = name; |
| 1383 | |
| 1384 | while ((loop = strchr(loop, ',')) != NULL) { |
| 1385 | ++count; |
| 1386 | ++loop; /* skip ',' */ |
| 1387 | } |
| 1388 | |
| 1389 | *addrpp = xtables_malloc(sizeof(struct in_addr) * count); |
| 1390 | *maskpp = xtables_malloc(sizeof(struct in_addr) * count); |
| 1391 | |
| 1392 | loop = name; |
| 1393 | |
| 1394 | for (i = 0; i < count; ++i) { |
Jan Engelhardt | 0c38444 | 2011-07-09 16:19:09 +0200 | [diff] [blame] | 1395 | while (isspace(*loop)) |
| 1396 | ++loop; |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1397 | next = strchr(loop, ','); |
| 1398 | if (next != NULL) |
| 1399 | len = next - loop; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1400 | else |
| 1401 | len = strlen(loop); |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1402 | if (len > sizeof(buf) - 1) |
| 1403 | xt_params->exit_err(PARAMETER_PROBLEM, |
| 1404 | "Hostname too long"); |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1405 | |
| 1406 | strncpy(buf, loop, len); |
| 1407 | buf[len] = '\0'; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1408 | if ((p = strrchr(buf, '/')) != NULL) { |
| 1409 | *p = '\0'; |
| 1410 | addrp = parse_ipmask(p + 1); |
| 1411 | } else { |
| 1412 | addrp = parse_ipmask(NULL); |
| 1413 | } |
| 1414 | memcpy(*maskpp + i, addrp, sizeof(*addrp)); |
| 1415 | |
| 1416 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
| 1417 | if ((*maskpp + i)->s_addr == 0) |
| 1418 | /* |
| 1419 | * A bit pointless to process multiple addresses |
| 1420 | * in this case... |
| 1421 | */ |
| 1422 | strcpy(buf, "0.0.0.0"); |
| 1423 | |
| 1424 | addrp = ipparse_hostnetwork(buf, &n); |
| 1425 | if (n > 1) { |
| 1426 | count += n - 1; |
| 1427 | *addrpp = xtables_realloc(*addrpp, |
| 1428 | sizeof(struct in_addr) * count); |
| 1429 | *maskpp = xtables_realloc(*maskpp, |
| 1430 | sizeof(struct in_addr) * count); |
| 1431 | for (j = 0; j < n; ++j) |
| 1432 | /* for each new addr */ |
| 1433 | memcpy(*addrpp + i + j, addrp + j, |
| 1434 | sizeof(*addrp)); |
| 1435 | for (j = 1; j < n; ++j) |
| 1436 | /* for each new mask */ |
| 1437 | memcpy(*maskpp + i + j, *maskpp + i, |
| 1438 | sizeof(*addrp)); |
| 1439 | i += n - 1; |
| 1440 | } else { |
| 1441 | memcpy(*addrpp + i, addrp, sizeof(*addrp)); |
| 1442 | } |
| 1443 | /* free what ipparse_hostnetwork had allocated: */ |
| 1444 | free(addrp); |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1445 | if (next == NULL) |
| 1446 | break; |
| 1447 | loop = next + 1; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1448 | } |
| 1449 | *naddrs = count; |
Jan Engelhardt | 4b110b4 | 2011-02-21 03:21:18 +0100 | [diff] [blame] | 1450 | for (i = 0; i < count; ++i) |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1451 | (*addrpp+i)->s_addr &= (*maskpp+i)->s_addr; |
| 1452 | } |
| 1453 | |
| 1454 | |
Jan Engelhardt | a0baae8 | 2009-01-30 04:32:50 +0100 | [diff] [blame] | 1455 | /** |
| 1456 | * xtables_ipparse_any - transform arbitrary name to in_addr |
| 1457 | * |
| 1458 | * Possible inputs (pseudo regex): |
| 1459 | * m{^($hostname|$networkname|$ipaddr)(/$mask)?} |
| 1460 | * "1.2.3.4/5", "1.2.3.4", "hostname", "networkname" |
| 1461 | */ |
| 1462 | void xtables_ipparse_any(const char *name, struct in_addr **addrpp, |
| 1463 | struct in_addr *maskp, unsigned int *naddrs) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1464 | { |
| 1465 | unsigned int i, j, k, n; |
| 1466 | struct in_addr *addrp; |
| 1467 | char buf[256], *p; |
| 1468 | |
| 1469 | strncpy(buf, name, sizeof(buf) - 1); |
| 1470 | buf[sizeof(buf) - 1] = '\0'; |
| 1471 | if ((p = strrchr(buf, '/')) != NULL) { |
| 1472 | *p = '\0'; |
| 1473 | addrp = parse_ipmask(p + 1); |
| 1474 | } else { |
| 1475 | addrp = parse_ipmask(NULL); |
| 1476 | } |
| 1477 | memcpy(maskp, addrp, sizeof(*maskp)); |
| 1478 | |
| 1479 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
| 1480 | if (maskp->s_addr == 0U) |
| 1481 | strcpy(buf, "0.0.0.0"); |
| 1482 | |
| 1483 | addrp = *addrpp = ipparse_hostnetwork(buf, naddrs); |
| 1484 | n = *naddrs; |
| 1485 | for (i = 0, j = 0; i < n; ++i) { |
| 1486 | addrp[j++].s_addr &= maskp->s_addr; |
| 1487 | for (k = 0; k < j - 1; ++k) |
| 1488 | if (addrp[k].s_addr == addrp[j-1].s_addr) { |
Wes Campaigne | adcb281 | 2011-02-21 19:10:12 -0500 | [diff] [blame] | 1489 | /* |
| 1490 | * Nuke the dup by copying an address from the |
| 1491 | * tail here, and check the current position |
| 1492 | * again (--j). |
| 1493 | */ |
| 1494 | memcpy(&addrp[--j], &addrp[--*naddrs], |
| 1495 | sizeof(struct in_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1496 | break; |
| 1497 | } |
| 1498 | } |
| 1499 | } |
| 1500 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1501 | const char *xtables_ip6addr_to_numeric(const struct in6_addr *addrp) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1502 | { |
Maciej Zenczykowski | cf3e52d | 2011-04-04 15:31:09 +0200 | [diff] [blame] | 1503 | /* 0000:0000:0000:0000:0000:0000:000.000.000.000 |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1504 | * 0000:0000:0000:0000:0000:0000:0000:0000 */ |
| 1505 | static char buf[50+1]; |
| 1506 | return inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); |
| 1507 | } |
| 1508 | |
| 1509 | static const char *ip6addr_to_host(const struct in6_addr *addr) |
| 1510 | { |
| 1511 | static char hostname[NI_MAXHOST]; |
| 1512 | struct sockaddr_in6 saddr; |
| 1513 | int err; |
| 1514 | |
| 1515 | memset(&saddr, 0, sizeof(struct sockaddr_in6)); |
| 1516 | memcpy(&saddr.sin6_addr, addr, sizeof(*addr)); |
| 1517 | saddr.sin6_family = AF_INET6; |
| 1518 | |
| 1519 | err = getnameinfo((const void *)&saddr, sizeof(struct sockaddr_in6), |
| 1520 | hostname, sizeof(hostname) - 1, NULL, 0, 0); |
| 1521 | if (err != 0) { |
| 1522 | #ifdef DEBUG |
| 1523 | fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); |
| 1524 | #endif |
| 1525 | return NULL; |
| 1526 | } |
| 1527 | |
| 1528 | #ifdef DEBUG |
| 1529 | fprintf (stderr, "\naddr2host: %s\n", hostname); |
| 1530 | #endif |
| 1531 | return hostname; |
| 1532 | } |
| 1533 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1534 | const char *xtables_ip6addr_to_anyname(const struct in6_addr *addr) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1535 | { |
| 1536 | const char *name; |
| 1537 | |
| 1538 | if ((name = ip6addr_to_host(addr)) != NULL) |
| 1539 | return name; |
| 1540 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1541 | return xtables_ip6addr_to_numeric(addr); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1542 | } |
| 1543 | |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1544 | int xtables_ip6mask_to_cidr(const struct in6_addr *k) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1545 | { |
| 1546 | unsigned int bits = 0; |
| 1547 | uint32_t a, b, c, d; |
| 1548 | |
Jan Engelhardt | 4860781 | 2008-06-10 15:17:53 +0200 | [diff] [blame] | 1549 | a = ntohl(k->s6_addr32[0]); |
| 1550 | b = ntohl(k->s6_addr32[1]); |
| 1551 | c = ntohl(k->s6_addr32[2]); |
| 1552 | d = ntohl(k->s6_addr32[3]); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1553 | while (a & 0x80000000U) { |
| 1554 | ++bits; |
| 1555 | a <<= 1; |
| 1556 | a |= (b >> 31) & 1; |
| 1557 | b <<= 1; |
| 1558 | b |= (c >> 31) & 1; |
| 1559 | c <<= 1; |
| 1560 | c |= (d >> 31) & 1; |
| 1561 | d <<= 1; |
| 1562 | } |
| 1563 | if (a != 0 || b != 0 || c != 0 || d != 0) |
| 1564 | return -1; |
| 1565 | return bits; |
| 1566 | } |
| 1567 | |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1568 | const char *xtables_ip6mask_to_numeric(const struct in6_addr *addrp) |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1569 | { |
| 1570 | static char buf[50+2]; |
Pablo Neira Ayuso | a96166c | 2012-07-14 15:39:20 +0200 | [diff] [blame] | 1571 | int l = xtables_ip6mask_to_cidr(addrp); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1572 | |
| 1573 | if (l == -1) { |
| 1574 | strcpy(buf, "/"); |
Jan Engelhardt | e44ea7f | 2009-01-30 03:55:09 +0100 | [diff] [blame] | 1575 | strcat(buf, xtables_ip6addr_to_numeric(addrp)); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1576 | return buf; |
| 1577 | } |
| 1578 | sprintf(buf, "/%d", l); |
| 1579 | return buf; |
| 1580 | } |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1581 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1582 | struct in6_addr *xtables_numeric_to_ip6addr(const char *num) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1583 | { |
| 1584 | static struct in6_addr ap; |
| 1585 | int err; |
| 1586 | |
| 1587 | if ((err = inet_pton(AF_INET6, num, &ap)) == 1) |
| 1588 | return ≈ |
| 1589 | #ifdef DEBUG |
| 1590 | fprintf(stderr, "\nnumeric2addr: %d\n", err); |
| 1591 | #endif |
| 1592 | return NULL; |
| 1593 | } |
| 1594 | |
| 1595 | static struct in6_addr * |
| 1596 | host_to_ip6addr(const char *name, unsigned int *naddr) |
| 1597 | { |
Wes Campaigne | 2ad8dc8 | 2011-02-21 19:10:10 -0500 | [diff] [blame] | 1598 | struct in6_addr *addr; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1599 | struct addrinfo hints; |
Wes Campaigne | 2ad8dc8 | 2011-02-21 19:10:10 -0500 | [diff] [blame] | 1600 | struct addrinfo *res, *p; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1601 | int err; |
Wes Campaigne | 2ad8dc8 | 2011-02-21 19:10:10 -0500 | [diff] [blame] | 1602 | unsigned int i; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1603 | |
| 1604 | memset(&hints, 0, sizeof(hints)); |
| 1605 | hints.ai_flags = AI_CANONNAME; |
| 1606 | hints.ai_family = AF_INET6; |
| 1607 | hints.ai_socktype = SOCK_RAW; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1608 | |
| 1609 | *naddr = 0; |
| 1610 | if ((err = getaddrinfo(name, NULL, &hints, &res)) != 0) { |
| 1611 | #ifdef DEBUG |
| 1612 | fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); |
| 1613 | #endif |
| 1614 | return NULL; |
| 1615 | } else { |
Wes Campaigne | 2ad8dc8 | 2011-02-21 19:10:10 -0500 | [diff] [blame] | 1616 | /* Find length of address chain */ |
| 1617 | for (p = res; p != NULL; p = p->ai_next) |
| 1618 | ++*naddr; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1619 | #ifdef DEBUG |
| 1620 | fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, |
Patrick McHardy | 30290ae | 2010-05-20 15:41:03 +0200 | [diff] [blame] | 1621 | xtables_ip6addr_to_numeric(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1622 | #endif |
Wes Campaigne | 2ad8dc8 | 2011-02-21 19:10:10 -0500 | [diff] [blame] | 1623 | /* Copy each element of the address chain */ |
| 1624 | addr = xtables_calloc(*naddr, sizeof(struct in6_addr)); |
| 1625 | for (i = 0, p = res; p != NULL; p = p->ai_next) |
| 1626 | memcpy(&addr[i++], |
| 1627 | &((const struct sockaddr_in6 *)p->ai_addr)->sin6_addr, |
| 1628 | sizeof(struct in6_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1629 | freeaddrinfo(res); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1630 | return addr; |
| 1631 | } |
| 1632 | |
| 1633 | return NULL; |
| 1634 | } |
| 1635 | |
| 1636 | static struct in6_addr *network_to_ip6addr(const char *name) |
| 1637 | { |
| 1638 | /* abort();*/ |
| 1639 | /* TODO: not implemented yet, but the exception breaks the |
| 1640 | * name resolvation */ |
| 1641 | return NULL; |
| 1642 | } |
| 1643 | |
| 1644 | static struct in6_addr * |
| 1645 | ip6parse_hostnetwork(const char *name, unsigned int *naddrs) |
| 1646 | { |
| 1647 | struct in6_addr *addrp, *addrptmp; |
| 1648 | |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1649 | if ((addrptmp = xtables_numeric_to_ip6addr(name)) != NULL || |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1650 | (addrptmp = network_to_ip6addr(name)) != NULL) { |
Jan Engelhardt | 630ef48 | 2009-01-27 14:58:41 +0100 | [diff] [blame] | 1651 | addrp = xtables_malloc(sizeof(struct in6_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1652 | memcpy(addrp, addrptmp, sizeof(*addrp)); |
| 1653 | *naddrs = 1; |
| 1654 | return addrp; |
| 1655 | } |
| 1656 | if ((addrp = host_to_ip6addr(name, naddrs)) != NULL) |
| 1657 | return addrp; |
| 1658 | |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1659 | xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1660 | } |
| 1661 | |
| 1662 | static struct in6_addr *parse_ip6mask(char *mask) |
| 1663 | { |
| 1664 | static struct in6_addr maskaddr; |
| 1665 | struct in6_addr *addrp; |
| 1666 | unsigned int bits; |
| 1667 | |
| 1668 | if (mask == NULL) { |
| 1669 | /* no mask at all defaults to 128 bits */ |
| 1670 | memset(&maskaddr, 0xff, sizeof maskaddr); |
| 1671 | return &maskaddr; |
| 1672 | } |
Jan Engelhardt | 1e01b0b | 2009-01-30 04:20:32 +0100 | [diff] [blame] | 1673 | if ((addrp = xtables_numeric_to_ip6addr(mask)) != NULL) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1674 | return addrp; |
Jan Engelhardt | 5f2922c | 2009-01-27 18:43:01 +0100 | [diff] [blame] | 1675 | if (!xtables_strtoui(mask, NULL, &bits, 0, 128)) |
Jamal Hadi Salim | 8b7baeb | 2009-02-11 13:05:43 +0100 | [diff] [blame] | 1676 | xt_params->exit_err(PARAMETER_PROBLEM, |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1677 | "invalid mask `%s' specified", mask); |
| 1678 | if (bits != 0) { |
| 1679 | char *p = (void *)&maskaddr; |
| 1680 | memset(p, 0xff, bits / 8); |
| 1681 | memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); |
| 1682 | p[bits/8] = 0xff << (8 - (bits & 7)); |
| 1683 | return &maskaddr; |
| 1684 | } |
| 1685 | |
| 1686 | memset(&maskaddr, 0, sizeof(maskaddr)); |
| 1687 | return &maskaddr; |
| 1688 | } |
| 1689 | |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1690 | void |
| 1691 | xtables_ip6parse_multiple(const char *name, struct in6_addr **addrpp, |
| 1692 | struct in6_addr **maskpp, unsigned int *naddrs) |
| 1693 | { |
Olaf Rempel | 58df901 | 2009-09-20 13:24:11 +0200 | [diff] [blame] | 1694 | static const struct in6_addr zero_addr; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1695 | struct in6_addr *addrp; |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1696 | char buf[256], *p, *next; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1697 | unsigned int len, i, j, n, count = 1; |
| 1698 | const char *loop = name; |
| 1699 | |
| 1700 | while ((loop = strchr(loop, ',')) != NULL) { |
| 1701 | ++count; |
| 1702 | ++loop; /* skip ',' */ |
| 1703 | } |
| 1704 | |
| 1705 | *addrpp = xtables_malloc(sizeof(struct in6_addr) * count); |
| 1706 | *maskpp = xtables_malloc(sizeof(struct in6_addr) * count); |
| 1707 | |
| 1708 | loop = name; |
| 1709 | |
| 1710 | for (i = 0; i < count /*NB: count can grow*/; ++i) { |
Jan Engelhardt | 0c38444 | 2011-07-09 16:19:09 +0200 | [diff] [blame] | 1711 | while (isspace(*loop)) |
| 1712 | ++loop; |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1713 | next = strchr(loop, ','); |
| 1714 | if (next != NULL) |
| 1715 | len = next - loop; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1716 | else |
| 1717 | len = strlen(loop); |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1718 | if (len > sizeof(buf) - 1) |
| 1719 | xt_params->exit_err(PARAMETER_PROBLEM, |
| 1720 | "Hostname too long"); |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1721 | |
| 1722 | strncpy(buf, loop, len); |
| 1723 | buf[len] = '\0'; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1724 | if ((p = strrchr(buf, '/')) != NULL) { |
| 1725 | *p = '\0'; |
| 1726 | addrp = parse_ip6mask(p + 1); |
| 1727 | } else { |
| 1728 | addrp = parse_ip6mask(NULL); |
| 1729 | } |
| 1730 | memcpy(*maskpp + i, addrp, sizeof(*addrp)); |
| 1731 | |
| 1732 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
Olaf Rempel | 58df901 | 2009-09-20 13:24:11 +0200 | [diff] [blame] | 1733 | if (memcmp(*maskpp + i, &zero_addr, sizeof(zero_addr)) == 0) |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1734 | strcpy(buf, "::"); |
| 1735 | |
| 1736 | addrp = ip6parse_hostnetwork(buf, &n); |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1737 | if (n > 1) { |
| 1738 | count += n - 1; |
| 1739 | *addrpp = xtables_realloc(*addrpp, |
| 1740 | sizeof(struct in6_addr) * count); |
| 1741 | *maskpp = xtables_realloc(*maskpp, |
| 1742 | sizeof(struct in6_addr) * count); |
| 1743 | for (j = 0; j < n; ++j) |
| 1744 | /* for each new addr */ |
| 1745 | memcpy(*addrpp + i + j, addrp + j, |
| 1746 | sizeof(*addrp)); |
| 1747 | for (j = 1; j < n; ++j) |
| 1748 | /* for each new mask */ |
| 1749 | memcpy(*maskpp + i + j, *maskpp + i, |
| 1750 | sizeof(*addrp)); |
| 1751 | i += n - 1; |
| 1752 | } else { |
| 1753 | memcpy(*addrpp + i, addrp, sizeof(*addrp)); |
| 1754 | } |
| 1755 | /* free what ip6parse_hostnetwork had allocated: */ |
| 1756 | free(addrp); |
Jan Engelhardt | c0e69db | 2011-07-09 16:01:18 +0200 | [diff] [blame] | 1757 | if (next == NULL) |
| 1758 | break; |
| 1759 | loop = next + 1; |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1760 | } |
| 1761 | *naddrs = count; |
Jan Engelhardt | 4b110b4 | 2011-02-21 03:21:18 +0100 | [diff] [blame] | 1762 | for (i = 0; i < count; ++i) |
Michael Granzow | 332e4ac | 2009-04-09 18:24:36 +0100 | [diff] [blame] | 1763 | for (j = 0; j < 4; ++j) |
| 1764 | (*addrpp+i)->s6_addr32[j] &= (*maskpp+i)->s6_addr32[j]; |
| 1765 | } |
| 1766 | |
Jan Engelhardt | a0baae8 | 2009-01-30 04:32:50 +0100 | [diff] [blame] | 1767 | void xtables_ip6parse_any(const char *name, struct in6_addr **addrpp, |
| 1768 | struct in6_addr *maskp, unsigned int *naddrs) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1769 | { |
Jan Engelhardt | 9c0fa7d | 2009-04-03 22:40:35 +0200 | [diff] [blame] | 1770 | static const struct in6_addr zero_addr; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1771 | struct in6_addr *addrp; |
| 1772 | unsigned int i, j, k, n; |
| 1773 | char buf[256], *p; |
| 1774 | |
| 1775 | strncpy(buf, name, sizeof(buf) - 1); |
| 1776 | buf[sizeof(buf)-1] = '\0'; |
| 1777 | if ((p = strrchr(buf, '/')) != NULL) { |
| 1778 | *p = '\0'; |
| 1779 | addrp = parse_ip6mask(p + 1); |
| 1780 | } else { |
| 1781 | addrp = parse_ip6mask(NULL); |
| 1782 | } |
| 1783 | memcpy(maskp, addrp, sizeof(*maskp)); |
| 1784 | |
| 1785 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
Jan Engelhardt | 9c0fa7d | 2009-04-03 22:40:35 +0200 | [diff] [blame] | 1786 | if (memcmp(maskp, &zero_addr, sizeof(zero_addr)) == 0) |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1787 | strcpy(buf, "::"); |
| 1788 | |
| 1789 | addrp = *addrpp = ip6parse_hostnetwork(buf, naddrs); |
| 1790 | n = *naddrs; |
| 1791 | for (i = 0, j = 0; i < n; ++i) { |
| 1792 | for (k = 0; k < 4; ++k) |
Yasuyuki Kozakai | 5a2208c | 2008-06-04 15:16:03 +0200 | [diff] [blame] | 1793 | addrp[j].s6_addr32[k] &= maskp->s6_addr32[k]; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1794 | ++j; |
| 1795 | for (k = 0; k < j - 1; ++k) |
| 1796 | if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { |
Wes Campaigne | adcb281 | 2011-02-21 19:10:12 -0500 | [diff] [blame] | 1797 | /* |
| 1798 | * Nuke the dup by copying an address from the |
| 1799 | * tail here, and check the current position |
| 1800 | * again (--j). |
| 1801 | */ |
| 1802 | memcpy(&addrp[--j], &addrp[--*naddrs], |
| 1803 | sizeof(struct in_addr)); |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1804 | break; |
| 1805 | } |
| 1806 | } |
| 1807 | } |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1808 | |
Jan Engelhardt | a0baae8 | 2009-01-30 04:32:50 +0100 | [diff] [blame] | 1809 | void xtables_save_string(const char *value) |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1810 | { |
| 1811 | static const char no_quote_chars[] = "_-0123456789" |
| 1812 | "abcdefghijklmnopqrstuvwxyz" |
| 1813 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| 1814 | static const char escape_chars[] = "\"\\'"; |
| 1815 | size_t length; |
| 1816 | const char *p; |
| 1817 | |
Max Kellerman | 87dc7c4 | 2011-02-17 11:57:19 +0100 | [diff] [blame] | 1818 | length = strspn(value, no_quote_chars); |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1819 | if (length > 0 && value[length] == 0) { |
| 1820 | /* no quoting required */ |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1821 | putchar(' '); |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 1822 | fputs(value, stdout); |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1823 | } else { |
| 1824 | /* there is at least one dangerous character in the |
| 1825 | value, which we have to quote. Write double quotes |
| 1826 | around the value and escape special characters with |
| 1827 | a backslash */ |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 1828 | printf(" \""); |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1829 | |
| 1830 | for (p = strpbrk(value, escape_chars); p != NULL; |
| 1831 | p = strpbrk(value, escape_chars)) { |
| 1832 | if (p > value) |
| 1833 | fwrite(value, 1, p - value, stdout); |
| 1834 | putchar('\\'); |
| 1835 | putchar(*p); |
| 1836 | value = p + 1; |
| 1837 | } |
| 1838 | |
| 1839 | /* print the rest and finish the double quoted |
| 1840 | string */ |
| 1841 | fputs(value, stdout); |
Jan Engelhardt | 7386635 | 2010-12-18 02:04:59 +0100 | [diff] [blame] | 1842 | putchar('\"'); |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1843 | } |
| 1844 | } |
Jan Engelhardt | 0f16c72 | 2009-01-30 04:55:38 +0100 | [diff] [blame] | 1845 | |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1846 | const struct xtables_pprot xtables_chain_protos[] = { |
| 1847 | {"tcp", IPPROTO_TCP}, |
| 1848 | {"sctp", IPPROTO_SCTP}, |
| 1849 | {"udp", IPPROTO_UDP}, |
| 1850 | {"udplite", IPPROTO_UDPLITE}, |
| 1851 | {"icmp", IPPROTO_ICMP}, |
| 1852 | {"icmpv6", IPPROTO_ICMPV6}, |
| 1853 | {"ipv6-icmp", IPPROTO_ICMPV6}, |
| 1854 | {"esp", IPPROTO_ESP}, |
| 1855 | {"ah", IPPROTO_AH}, |
| 1856 | {"ipv6-mh", IPPROTO_MH}, |
| 1857 | {"mh", IPPROTO_MH}, |
| 1858 | {"all", 0}, |
| 1859 | {NULL}, |
| 1860 | }; |
| 1861 | |
Jan Engelhardt | 7ac4052 | 2011-01-07 12:34:04 +0100 | [diff] [blame] | 1862 | uint16_t |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1863 | xtables_parse_protocol(const char *s) |
| 1864 | { |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1865 | const struct protoent *pent; |
| 1866 | unsigned int proto, i; |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1867 | |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1868 | if (xtables_strtoui(s, NULL, &proto, 0, UINT8_MAX)) |
| 1869 | return proto; |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1870 | |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1871 | /* first deal with the special case of 'all' to prevent |
| 1872 | * people from being able to redefine 'all' in nsswitch |
| 1873 | * and/or provoke expensive [not working] ldap/nis/... |
| 1874 | * lookups */ |
| 1875 | if (strcmp(s, "all") == 0) |
| 1876 | return 0; |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1877 | |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1878 | pent = getprotobyname(s); |
| 1879 | if (pent != NULL) |
| 1880 | return pent->p_proto; |
Pablo Neira Ayuso | e55cc4a | 2009-05-12 09:51:26 +0200 | [diff] [blame] | 1881 | |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1882 | for (i = 0; i < ARRAY_SIZE(xtables_chain_protos); ++i) { |
| 1883 | if (xtables_chain_protos[i].name == NULL) |
| 1884 | continue; |
| 1885 | if (strcmp(s, xtables_chain_protos[i].name) == 0) |
| 1886 | return xtables_chain_protos[i].num; |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1887 | } |
Jan Engelhardt | 85f423a | 2011-05-12 14:03:36 +0200 | [diff] [blame] | 1888 | xt_params->exit_err(PARAMETER_PROBLEM, |
| 1889 | "unknown protocol \"%s\" specified", s); |
| 1890 | return -1; |
Jan Engelhardt | 1de7edf | 2009-01-30 05:38:11 +0100 | [diff] [blame] | 1891 | } |
Jan Engelhardt | f56b8a8 | 2011-09-03 14:27:55 +0200 | [diff] [blame] | 1892 | |
| 1893 | int kernel_version; |
| 1894 | |
| 1895 | void get_kernel_version(void) |
| 1896 | { |
| 1897 | static struct utsname uts; |
| 1898 | int x = 0, y = 0, z = 0; |
| 1899 | |
| 1900 | if (uname(&uts) == -1) { |
| 1901 | fprintf(stderr, "Unable to retrieve kernel version.\n"); |
| 1902 | xtables_free_opts(1); |
| 1903 | exit(1); |
| 1904 | } |
| 1905 | |
| 1906 | sscanf(uts.release, "%d.%d.%d", &x, &y, &z); |
| 1907 | kernel_version = LINUX_VERSION(x, y, z); |
| 1908 | } |