| /* |
| * (C) 2000-2006 by the netfilter coreteam <coreteam@netfilter.org>: |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <netdb.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <arpa/inet.h> |
| |
| #include <xtables.h> |
| #include <limits.h> /* INT_MAX in ip_tables.h/ip6_tables.h */ |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| #include <linux/netfilter_ipv6/ip6_tables.h> |
| #include <libiptc/libxtc.h> |
| |
| #ifndef NO_SHARED_LIBS |
| #include <dlfcn.h> |
| #endif |
| #ifndef IPT_SO_GET_REVISION_MATCH /* Old kernel source. */ |
| # define IPT_SO_GET_REVISION_MATCH (IPT_BASE_CTL + 2) |
| # define IPT_SO_GET_REVISION_TARGET (IPT_BASE_CTL + 3) |
| #endif |
| #ifndef IP6T_SO_GET_REVISION_MATCH /* Old kernel source. */ |
| # define IP6T_SO_GET_REVISION_MATCH 68 |
| # define IP6T_SO_GET_REVISION_TARGET 69 |
| #endif |
| #include <getopt.h> |
| |
| |
| #define NPROTO 255 |
| |
| #ifndef PROC_SYS_MODPROBE |
| #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" |
| #endif |
| |
| void basic_exit_err(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); |
| |
| struct xtables_globals *xt_params = NULL; |
| |
| void basic_exit_err(enum xtables_exittype status, const char *msg, ...) |
| { |
| va_list args; |
| |
| va_start(args, msg); |
| fprintf(stderr, "%s v%s: ", xt_params->program_name, xt_params->program_version); |
| vfprintf(stderr, msg, args); |
| va_end(args); |
| fprintf(stderr, "\n"); |
| exit(status); |
| } |
| |
| void xtables_free_opts(int unused) |
| { |
| free(xt_params->opts); |
| } |
| |
| struct option *xtables_merge_options(struct option *orig_opts, |
| struct option *oldopts, |
| const struct option *newopts, |
| unsigned int *option_offset) |
| { |
| unsigned int num_oold = 0, num_old = 0, num_new = 0, i; |
| struct option *merge, *mp; |
| |
| if (newopts == NULL) |
| return oldopts; |
| |
| for (num_oold = 0; orig_opts[num_oold].name; num_oold++) ; |
| if (oldopts != NULL) |
| for (num_old = 0; oldopts[num_old].name; num_old++) ; |
| for (num_new = 0; newopts[num_new].name; num_new++) ; |
| |
| merge = malloc(sizeof(*mp) * (num_oold + num_old + num_new + 1)); |
| if (merge == NULL) |
| return NULL; |
| |
| /* Let the base options -[ADI...] have precedence over everything */ |
| memcpy(merge, orig_opts, sizeof(*mp) * num_oold); |
| mp = merge + num_oold; |
| |
| /* Second, the new options */ |
| xt_params->option_offset += 256; |
| *option_offset = xt_params->option_offset; |
| memcpy(mp, newopts, sizeof(*mp) * num_new); |
| |
| for (i = 0; i < num_new; ++i, ++mp) |
| mp->val += *option_offset; |
| |
| /* Third, the old options */ |
| memcpy(mp, oldopts, sizeof(*mp) * num_old); |
| mp += num_old; |
| xtables_free_opts(0); |
| |
| /* Clear trailing entry */ |
| memset(mp, 0, sizeof(*mp)); |
| return merge; |
| } |
| |
| /** |
| * xtables_afinfo - protocol family dependent information |
| * @kmod: kernel module basename (e.g. "ip_tables") |
| * @libprefix: prefix of .so library name (e.g. "libipt_") |
| * @family: nfproto family |
| * @ipproto: used by setsockopt (e.g. IPPROTO_IP) |
| * @so_rev_match: optname to check revision support of match |
| * @so_rev_target: optname to check revision support of target |
| */ |
| struct xtables_afinfo { |
| const char *kmod; |
| const char *libprefix; |
| uint8_t family; |
| uint8_t ipproto; |
| int so_rev_match; |
| int so_rev_target; |
| }; |
| |
| static const struct xtables_afinfo afinfo_ipv4 = { |
| .kmod = "ip_tables", |
| .libprefix = "libipt_", |
| .family = NFPROTO_IPV4, |
| .ipproto = IPPROTO_IP, |
| .so_rev_match = IPT_SO_GET_REVISION_MATCH, |
| .so_rev_target = IPT_SO_GET_REVISION_TARGET, |
| }; |
| |
| static const struct xtables_afinfo afinfo_ipv6 = { |
| .kmod = "ip6_tables", |
| .libprefix = "libip6t_", |
| .family = NFPROTO_IPV6, |
| .ipproto = IPPROTO_IPV6, |
| .so_rev_match = IP6T_SO_GET_REVISION_MATCH, |
| .so_rev_target = IP6T_SO_GET_REVISION_TARGET, |
| }; |
| |
| static const struct xtables_afinfo *afinfo; |
| |
| /* Search path for Xtables .so files */ |
| static const char *xtables_libdir; |
| |
| /* the path to command to load kernel module */ |
| const char *xtables_modprobe_program; |
| |
| /* Keeping track of external matches and targets: linked lists. */ |
| struct xtables_match *xtables_matches; |
| struct xtables_target *xtables_targets; |
| |
| void xtables_init(void) |
| { |
| xtables_libdir = getenv("XTABLES_LIBDIR"); |
| if (xtables_libdir != NULL) |
| return; |
| xtables_libdir = getenv("IPTABLES_LIB_DIR"); |
| if (xtables_libdir != NULL) { |
| fprintf(stderr, "IPTABLES_LIB_DIR is deprecated, " |
| "use XTABLES_LIBDIR.\n"); |
| return; |
| } |
| /* |
| * Well yes, IP6TABLES_LIB_DIR is of lower priority over |
| * IPTABLES_LIB_DIR since this moved to libxtables; I think that is ok |
| * for these env vars are deprecated anyhow, and in light of the |
| * (shared) libxt_*.so files, makes less sense to have |
| * IPTABLES_LIB_DIR != IP6TABLES_LIB_DIR. |
| */ |
| xtables_libdir = getenv("IP6TABLES_LIB_DIR"); |
| if (xtables_libdir != NULL) { |
| fprintf(stderr, "IP6TABLES_LIB_DIR is deprecated, " |
| "use XTABLES_LIBDIR.\n"); |
| return; |
| } |
| xtables_libdir = XTABLES_LIBDIR; |
| } |
| |
| void xtables_set_nfproto(uint8_t nfproto) |
| { |
| switch (nfproto) { |
| case NFPROTO_IPV4: |
| afinfo = &afinfo_ipv4; |
| break; |
| case NFPROTO_IPV6: |
| afinfo = &afinfo_ipv6; |
| break; |
| default: |
| fprintf(stderr, "libxtables: unhandled NFPROTO in %s\n", |
| __func__); |
| } |
| } |
| |
| /** |
| * xtables_set_params - set the global parameters used by xtables |
| * @xtp: input xtables_globals structure |
| * |
| * The app is expected to pass a valid xtables_globals data-filled |
| * with proper values |
| * @xtp cannot be NULL |
| * |
| * Returns -1 on failure to set and 0 on success |
| */ |
| int xtables_set_params(struct xtables_globals *xtp) |
| { |
| if (!xtp) { |
| fprintf(stderr, "%s: Illegal global params\n",__func__); |
| return -1; |
| } |
| |
| xt_params = xtp; |
| |
| if (!xt_params->exit_err) |
| xt_params->exit_err = basic_exit_err; |
| |
| return 0; |
| } |
| |
| int xtables_init_all(struct xtables_globals *xtp, uint8_t nfproto) |
| { |
| xtables_init(); |
| xtables_set_nfproto(nfproto); |
| return xtables_set_params(xtp); |
| } |
| |
| /** |
| * xtables_*alloc - wrappers that exit on failure |
| */ |
| void *xtables_calloc(size_t count, size_t size) |
| { |
| void *p; |
| |
| if ((p = calloc(count, size)) == NULL) { |
| perror("ip[6]tables: calloc failed"); |
| exit(1); |
| } |
| |
| return p; |
| } |
| |
| void *xtables_malloc(size_t size) |
| { |
| void *p; |
| |
| if ((p = malloc(size)) == NULL) { |
| perror("ip[6]tables: malloc failed"); |
| exit(1); |
| } |
| |
| return p; |
| } |
| |
| void *xtables_realloc(void *ptr, size_t size) |
| { |
| void *p; |
| |
| if ((p = realloc(ptr, size)) == NULL) { |
| perror("ip[6]tables: realloc failed"); |
| exit(1); |
| } |
| |
| return p; |
| } |
| |
| static char *get_modprobe(void) |
| { |
| int procfile; |
| char *ret; |
| |
| #define PROCFILE_BUFSIZ 1024 |
| procfile = open(PROC_SYS_MODPROBE, O_RDONLY); |
| if (procfile < 0) |
| return NULL; |
| |
| ret = malloc(PROCFILE_BUFSIZ); |
| if (ret) { |
| memset(ret, 0, PROCFILE_BUFSIZ); |
| switch (read(procfile, ret, PROCFILE_BUFSIZ)) { |
| case -1: goto fail; |
| case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */ |
| } |
| if (ret[strlen(ret)-1]=='\n') |
| ret[strlen(ret)-1]=0; |
| close(procfile); |
| return ret; |
| } |
| fail: |
| free(ret); |
| close(procfile); |
| return NULL; |
| } |
| |
| int xtables_insmod(const char *modname, const char *modprobe, bool quiet) |
| { |
| char *buf = NULL; |
| char *argv[4]; |
| int status; |
| |
| /* If they don't explicitly set it, read out of kernel */ |
| if (!modprobe) { |
| buf = get_modprobe(); |
| if (!buf) |
| return -1; |
| modprobe = buf; |
| } |
| |
| /* |
| * Need to flush the buffer, or the child may output it again |
| * when switching the program thru execv. |
| */ |
| fflush(stdout); |
| |
| switch (vfork()) { |
| case 0: |
| argv[0] = (char *)modprobe; |
| argv[1] = (char *)modname; |
| if (quiet) { |
| argv[2] = "-q"; |
| argv[3] = NULL; |
| } else { |
| argv[2] = NULL; |
| argv[3] = NULL; |
| } |
| execv(argv[0], argv); |
| |
| /* not usually reached */ |
| exit(1); |
| case -1: |
| return -1; |
| |
| default: /* parent */ |
| wait(&status); |
| } |
| |
| free(buf); |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
| return 0; |
| return -1; |
| } |
| |
| int xtables_load_ko(const char *modprobe, bool quiet) |
| { |
| static bool loaded = false; |
| static int ret = -1; |
| |
| if (!loaded) { |
| ret = xtables_insmod(afinfo->kmod, modprobe, quiet); |
| loaded = (ret == 0); |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * xtables_strtou{i,l} - string to number conversion |
| * @s: input string |
| * @end: like strtoul's "end" pointer |
| * @value: pointer for result |
| * @min: minimum accepted value |
| * @max: maximum accepted value |
| * |
| * If @end is NULL, we assume the caller wants a "strict strtoul", and hence |
| * "15a" is rejected. |
| * In either case, the value obtained is compared for min-max compliance. |
| * Base is always 0, i.e. autodetect depending on @s. |
| * |
| * Returns true/false whether number was accepted. On failure, *value has |
| * undefined contents. |
| */ |
| bool xtables_strtoul(const char *s, char **end, unsigned long *value, |
| unsigned long min, unsigned long max) |
| { |
| unsigned long v; |
| char *my_end; |
| |
| errno = 0; |
| v = strtoul(s, &my_end, 0); |
| |
| if (my_end == s) |
| return false; |
| if (end != NULL) |
| *end = my_end; |
| |
| if (errno != ERANGE && min <= v && (max == 0 || v <= max)) { |
| if (value != NULL) |
| *value = v; |
| if (end == NULL) |
| return *my_end == '\0'; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool xtables_strtoui(const char *s, char **end, unsigned int *value, |
| unsigned int min, unsigned int max) |
| { |
| unsigned long v; |
| bool ret; |
| |
| ret = xtables_strtoul(s, end, &v, min, max); |
| if (value != NULL) |
| *value = v; |
| return ret; |
| } |
| |
| int xtables_service_to_port(const char *name, const char *proto) |
| { |
| struct servent *service; |
| |
| if ((service = getservbyname(name, proto)) != NULL) |
| return ntohs((unsigned short) service->s_port); |
| |
| return -1; |
| } |
| |
| u_int16_t xtables_parse_port(const char *port, const char *proto) |
| { |
| unsigned int portnum; |
| |
| if (xtables_strtoui(port, NULL, &portnum, 0, UINT16_MAX) || |
| (portnum = xtables_service_to_port(port, proto)) != (unsigned)-1) |
| return portnum; |
| |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "invalid port/service `%s' specified", port); |
| } |
| |
| void xtables_parse_interface(const char *arg, char *vianame, |
| unsigned char *mask) |
| { |
| unsigned int vialen = strlen(arg); |
| unsigned int i; |
| |
| memset(mask, 0, IFNAMSIZ); |
| memset(vianame, 0, IFNAMSIZ); |
| |
| if (vialen + 1 > IFNAMSIZ) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "interface name `%s' must be shorter than IFNAMSIZ" |
| " (%i)", arg, IFNAMSIZ-1); |
| |
| strcpy(vianame, arg); |
| if (vialen == 0) |
| memset(mask, 0, IFNAMSIZ); |
| else if (vianame[vialen - 1] == '+') { |
| memset(mask, 0xFF, vialen - 1); |
| memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); |
| /* Don't remove `+' here! -HW */ |
| } else { |
| /* Include nul-terminator in match */ |
| memset(mask, 0xFF, vialen + 1); |
| memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1); |
| for (i = 0; vianame[i]; i++) { |
| if (vianame[i] == '/' || |
| vianame[i] == ' ') { |
| fprintf(stderr, |
| "Warning: weird character in interface" |
| " `%s' ('/' and ' ' are not allowed by the kernel).\n", |
| vianame); |
| break; |
| } |
| } |
| } |
| } |
| |
| #ifndef NO_SHARED_LIBS |
| static void *load_extension(const char *search_path, const char *prefix, |
| const char *name, bool is_target) |
| { |
| const char *dir = search_path, *next; |
| void *ptr = NULL; |
| struct stat sb; |
| char path[256]; |
| |
| do { |
| next = strchr(dir, ':'); |
| if (next == NULL) |
| next = dir + strlen(dir); |
| snprintf(path, sizeof(path), "%.*s/libxt_%s.so", |
| (unsigned int)(next - dir), dir, name); |
| |
| if (dlopen(path, RTLD_NOW) != NULL) { |
| /* Found library. If it didn't register itself, |
| maybe they specified target as match. */ |
| if (is_target) |
| ptr = xtables_find_target(name, XTF_DONT_LOAD); |
| else |
| ptr = xtables_find_match(name, |
| XTF_DONT_LOAD, NULL); |
| } else if (stat(path, &sb) == 0) { |
| fprintf(stderr, "%s: %s\n", path, dlerror()); |
| } |
| |
| if (ptr != NULL) |
| return ptr; |
| |
| snprintf(path, sizeof(path), "%.*s/%s%s.so", |
| (unsigned int)(next - dir), dir, prefix, name); |
| if (dlopen(path, RTLD_NOW) != NULL) { |
| if (is_target) |
| ptr = xtables_find_target(name, XTF_DONT_LOAD); |
| else |
| ptr = xtables_find_match(name, |
| XTF_DONT_LOAD, NULL); |
| } else if (stat(path, &sb) == 0) { |
| fprintf(stderr, "%s: %s\n", path, dlerror()); |
| } |
| |
| if (ptr != NULL) |
| return ptr; |
| |
| dir = next + 1; |
| } while (*next != '\0'); |
| |
| return NULL; |
| } |
| #endif |
| |
| struct xtables_match * |
| xtables_find_match(const char *name, enum xtables_tryload tryload, |
| struct xtables_rule_match **matches) |
| { |
| struct xtables_match *ptr; |
| const char *icmp6 = "icmp6"; |
| |
| if (strlen(name) >= XT_EXTENSION_MAXNAMELEN) |
| xtables_error(PARAMETER_PROBLEM, |
| "Invalid match name \"%s\" (%u chars max)", |
| name, XT_EXTENSION_MAXNAMELEN - 1); |
| |
| /* This is ugly as hell. Nonetheless, there is no way of changing |
| * this without hurting backwards compatibility */ |
| if ( (strcmp(name,"icmpv6") == 0) || |
| (strcmp(name,"ipv6-icmp") == 0) || |
| (strcmp(name,"icmp6") == 0) ) |
| name = icmp6; |
| |
| for (ptr = xtables_matches; ptr; ptr = ptr->next) { |
| if (strcmp(name, ptr->name) == 0) { |
| struct xtables_match *clone; |
| |
| /* First match of this type: */ |
| if (ptr->m == NULL) |
| break; |
| |
| /* Second and subsequent clones */ |
| clone = xtables_malloc(sizeof(struct xtables_match)); |
| memcpy(clone, ptr, sizeof(struct xtables_match)); |
| clone->mflags = 0; |
| /* This is a clone: */ |
| clone->next = clone; |
| |
| ptr = clone; |
| break; |
| } |
| } |
| |
| #ifndef NO_SHARED_LIBS |
| if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { |
| ptr = load_extension(xtables_libdir, afinfo->libprefix, |
| name, false); |
| |
| if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "Couldn't load match `%s':%s\n", |
| name, dlerror()); |
| } |
| #else |
| if (ptr && !ptr->loaded) { |
| if (tryload != XTF_DONT_LOAD) |
| ptr->loaded = 1; |
| else |
| ptr = NULL; |
| } |
| if(!ptr && (tryload == XTF_LOAD_MUST_SUCCEED)) { |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "Couldn't find match `%s'\n", name); |
| } |
| #endif |
| |
| if (ptr && matches) { |
| struct xtables_rule_match **i; |
| struct xtables_rule_match *newentry; |
| |
| newentry = xtables_malloc(sizeof(struct xtables_rule_match)); |
| |
| for (i = matches; *i; i = &(*i)->next) { |
| if (strcmp(name, (*i)->match->name) == 0) |
| (*i)->completed = true; |
| } |
| newentry->match = ptr; |
| newentry->completed = false; |
| newentry->next = NULL; |
| *i = newentry; |
| } |
| |
| return ptr; |
| } |
| |
| struct xtables_target * |
| xtables_find_target(const char *name, enum xtables_tryload tryload) |
| { |
| struct xtables_target *ptr; |
| |
| /* Standard target? */ |
| if (strcmp(name, "") == 0 |
| || strcmp(name, XTC_LABEL_ACCEPT) == 0 |
| || strcmp(name, XTC_LABEL_DROP) == 0 |
| || strcmp(name, XTC_LABEL_QUEUE) == 0 |
| || strcmp(name, XTC_LABEL_RETURN) == 0) |
| name = "standard"; |
| |
| for (ptr = xtables_targets; ptr; ptr = ptr->next) { |
| if (strcmp(name, ptr->name) == 0) |
| break; |
| } |
| |
| #ifndef NO_SHARED_LIBS |
| if (!ptr && tryload != XTF_DONT_LOAD && tryload != XTF_DURING_LOAD) { |
| ptr = load_extension(xtables_libdir, afinfo->libprefix, |
| name, true); |
| |
| if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "Couldn't load target `%s':%s\n", |
| name, dlerror()); |
| } |
| #else |
| if (ptr && !ptr->loaded) { |
| if (tryload != XTF_DONT_LOAD) |
| ptr->loaded = 1; |
| else |
| ptr = NULL; |
| } |
| if (ptr == NULL && tryload == XTF_LOAD_MUST_SUCCEED) { |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "Couldn't find target `%s'\n", name); |
| } |
| #endif |
| |
| if (ptr) |
| ptr->used = 1; |
| |
| return ptr; |
| } |
| |
| static int compatible_revision(const char *name, u_int8_t revision, int opt) |
| { |
| struct xt_get_revision rev; |
| socklen_t s = sizeof(rev); |
| int max_rev, sockfd; |
| |
| sockfd = socket(afinfo->family, SOCK_RAW, IPPROTO_RAW); |
| if (sockfd < 0) { |
| if (errno == EPERM) { |
| /* revision 0 is always supported. */ |
| if (revision != 0) |
| fprintf(stderr, "Could not determine whether " |
| "revision %u is supported, " |
| "assuming it is.\n", |
| revision); |
| return 1; |
| } |
| fprintf(stderr, "Could not open socket to kernel: %s\n", |
| strerror(errno)); |
| exit(1); |
| } |
| |
| xtables_load_ko(xtables_modprobe_program, true); |
| |
| strcpy(rev.name, name); |
| rev.revision = revision; |
| |
| max_rev = getsockopt(sockfd, afinfo->ipproto, opt, &rev, &s); |
| if (max_rev < 0) { |
| /* Definitely don't support this? */ |
| if (errno == ENOENT || errno == EPROTONOSUPPORT) { |
| close(sockfd); |
| return 0; |
| } else if (errno == ENOPROTOOPT) { |
| close(sockfd); |
| /* Assume only revision 0 support (old kernel) */ |
| return (revision == 0); |
| } else { |
| fprintf(stderr, "getsockopt failed strangely: %s\n", |
| strerror(errno)); |
| exit(1); |
| } |
| } |
| close(sockfd); |
| return 1; |
| } |
| |
| |
| static int compatible_match_revision(const char *name, u_int8_t revision) |
| { |
| return compatible_revision(name, revision, afinfo->so_rev_match); |
| } |
| |
| static int compatible_target_revision(const char *name, u_int8_t revision) |
| { |
| return compatible_revision(name, revision, afinfo->so_rev_target); |
| } |
| |
| void xtables_register_match(struct xtables_match *me) |
| { |
| struct xtables_match **i, *old; |
| |
| if (me->version == NULL) { |
| fprintf(stderr, "%s: match %s<%u> is missing a version\n", |
| xt_params->program_name, me->name, me->revision); |
| exit(1); |
| } |
| if (strcmp(me->version, XTABLES_VERSION) != 0) { |
| fprintf(stderr, "%s: match \"%s\" has version \"%s\", " |
| "but \"%s\" is required.\n", |
| xt_params->program_name, me->name, |
| me->version, XTABLES_VERSION); |
| exit(1); |
| } |
| |
| if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { |
| fprintf(stderr, "%s: target `%s' has invalid name\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| if (me->family >= NPROTO) { |
| fprintf(stderr, |
| "%s: BUG: match %s has invalid protocol family\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| /* ignore not interested match */ |
| if (me->family != afinfo->family && me->family != AF_UNSPEC) |
| return; |
| |
| old = xtables_find_match(me->name, XTF_DURING_LOAD, NULL); |
| if (old) { |
| if (old->revision == me->revision && |
| old->family == me->family) { |
| fprintf(stderr, |
| "%s: match `%s' already registered.\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| /* Now we have two (or more) options, check compatibility. */ |
| if (compatible_match_revision(old->name, old->revision) |
| && old->revision > me->revision) |
| return; |
| |
| /* See if new match can be used. */ |
| if (!compatible_match_revision(me->name, me->revision)) |
| return; |
| |
| /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ |
| if (old->revision == me->revision && me->family == AF_UNSPEC) |
| return; |
| |
| /* Delete old one. */ |
| for (i = &xtables_matches; *i!=old; i = &(*i)->next); |
| *i = old->next; |
| } |
| |
| if (me->size != XT_ALIGN(me->size)) { |
| fprintf(stderr, "%s: match `%s' has invalid size %u.\n", |
| xt_params->program_name, me->name, |
| (unsigned int)me->size); |
| exit(1); |
| } |
| |
| /* Append to list. */ |
| for (i = &xtables_matches; *i; i = &(*i)->next); |
| me->next = NULL; |
| *i = me; |
| |
| me->m = NULL; |
| me->mflags = 0; |
| } |
| |
| void xtables_register_matches(struct xtables_match *match, unsigned int n) |
| { |
| do { |
| xtables_register_match(&match[--n]); |
| } while (n > 0); |
| } |
| |
| void xtables_register_target(struct xtables_target *me) |
| { |
| struct xtables_target *old; |
| |
| if (me->version == NULL) { |
| fprintf(stderr, "%s: target %s<%u> is missing a version\n", |
| xt_params->program_name, me->name, me->revision); |
| exit(1); |
| } |
| if (strcmp(me->version, XTABLES_VERSION) != 0) { |
| fprintf(stderr, "%s: target \"%s\" has version \"%s\", " |
| "but \"%s\" is required.\n", |
| xt_params->program_name, me->name, |
| me->version, XTABLES_VERSION); |
| exit(1); |
| } |
| |
| if (strlen(me->name) >= XT_EXTENSION_MAXNAMELEN) { |
| fprintf(stderr, "%s: target `%s' has invalid name\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| if (me->family >= NPROTO) { |
| fprintf(stderr, |
| "%s: BUG: target %s has invalid protocol family\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| /* ignore not interested target */ |
| if (me->family != afinfo->family && me->family != AF_UNSPEC) |
| return; |
| |
| old = xtables_find_target(me->name, XTF_DURING_LOAD); |
| if (old) { |
| struct xtables_target **i; |
| |
| if (old->revision == me->revision && |
| old->family == me->family) { |
| fprintf(stderr, |
| "%s: target `%s' already registered.\n", |
| xt_params->program_name, me->name); |
| exit(1); |
| } |
| |
| /* Now we have two (or more) options, check compatibility. */ |
| if (compatible_target_revision(old->name, old->revision) |
| && old->revision > me->revision) |
| return; |
| |
| /* See if new target can be used. */ |
| if (!compatible_target_revision(me->name, me->revision)) |
| return; |
| |
| /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ |
| if (old->revision == me->revision && me->family == AF_UNSPEC) |
| return; |
| |
| /* Delete old one. */ |
| for (i = &xtables_targets; *i!=old; i = &(*i)->next); |
| *i = old->next; |
| } |
| |
| if (me->size != XT_ALIGN(me->size)) { |
| fprintf(stderr, "%s: target `%s' has invalid size %u.\n", |
| xt_params->program_name, me->name, |
| (unsigned int)me->size); |
| exit(1); |
| } |
| |
| /* Prepend to list. */ |
| me->next = xtables_targets; |
| xtables_targets = me; |
| me->t = NULL; |
| me->tflags = 0; |
| } |
| |
| void xtables_register_targets(struct xtables_target *target, unsigned int n) |
| { |
| do { |
| xtables_register_target(&target[--n]); |
| } while (n > 0); |
| } |
| |
| /** |
| * xtables_param_act - act on condition |
| * @status: a constant from enum xtables_exittype |
| * |
| * %XTF_ONLY_ONCE: print error message that option may only be used once. |
| * @p1: module name (e.g. "mark") |
| * @p2(...): option in conflict (e.g. "--mark") |
| * @p3(...): condition to match on (see extensions/ for examples) |
| * |
| * %XTF_NO_INVERT: option does not support inversion |
| * @p1: module name |
| * @p2: option in conflict |
| * @p3: condition to match on |
| * |
| * %XTF_BAD_VALUE: bad value for option |
| * @p1: module name |
| * @p2: option with which the problem occured (e.g. "--mark") |
| * @p3: string the user passed in (e.g. "99999999999999") |
| * |
| * %XTF_ONE_ACTION: two mutually exclusive actions have been specified |
| * @p1: module name |
| * |
| * Displays an error message and exits the program. |
| */ |
| void xtables_param_act(unsigned int status, const char *p1, ...) |
| { |
| const char *p2, *p3; |
| va_list args; |
| bool b; |
| |
| va_start(args, p1); |
| |
| switch (status) { |
| case XTF_ONLY_ONCE: |
| p2 = va_arg(args, const char *); |
| b = va_arg(args, unsigned int); |
| if (!b) |
| return; |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "%s: \"%s\" option may only be specified once", |
| p1, p2); |
| break; |
| case XTF_NO_INVERT: |
| p2 = va_arg(args, const char *); |
| b = va_arg(args, unsigned int); |
| if (!b) |
| return; |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "%s: \"%s\" option cannot be inverted", p1, p2); |
| break; |
| case XTF_BAD_VALUE: |
| p2 = va_arg(args, const char *); |
| p3 = va_arg(args, const char *); |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "%s: Bad value for \"%s\" option: \"%s\"", |
| p1, p2, p3); |
| break; |
| case XTF_ONE_ACTION: |
| b = va_arg(args, unsigned int); |
| if (!b) |
| return; |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "%s: At most one action is possible", p1); |
| break; |
| default: |
| xt_params->exit_err(status, p1, args); |
| break; |
| } |
| |
| va_end(args); |
| } |
| |
| const char *xtables_ipaddr_to_numeric(const struct in_addr *addrp) |
| { |
| static char buf[20]; |
| const unsigned char *bytep = (const void *)&addrp->s_addr; |
| |
| sprintf(buf, "%u.%u.%u.%u", bytep[0], bytep[1], bytep[2], bytep[3]); |
| return buf; |
| } |
| |
| static const char *ipaddr_to_host(const struct in_addr *addr) |
| { |
| struct hostent *host; |
| |
| host = gethostbyaddr(addr, sizeof(struct in_addr), AF_INET); |
| if (host == NULL) |
| return NULL; |
| |
| return host->h_name; |
| } |
| |
| static const char *ipaddr_to_network(const struct in_addr *addr) |
| { |
| struct netent *net; |
| |
| if ((net = getnetbyaddr(ntohl(addr->s_addr), AF_INET)) != NULL) |
| return net->n_name; |
| |
| return NULL; |
| } |
| |
| const char *xtables_ipaddr_to_anyname(const struct in_addr *addr) |
| { |
| const char *name; |
| |
| if ((name = ipaddr_to_host(addr)) != NULL || |
| (name = ipaddr_to_network(addr)) != NULL) |
| return name; |
| |
| return xtables_ipaddr_to_numeric(addr); |
| } |
| |
| const char *xtables_ipmask_to_numeric(const struct in_addr *mask) |
| { |
| static char buf[20]; |
| uint32_t maskaddr, bits; |
| int i; |
| |
| maskaddr = ntohl(mask->s_addr); |
| |
| if (maskaddr == 0xFFFFFFFFL) |
| /* we don't want to see "/32" */ |
| return ""; |
| |
| i = 32; |
| bits = 0xFFFFFFFEL; |
| while (--i >= 0 && maskaddr != bits) |
| bits <<= 1; |
| if (i >= 0) |
| sprintf(buf, "/%d", i); |
| else |
| /* mask was not a decent combination of 1's and 0's */ |
| sprintf(buf, "/%s", xtables_ipaddr_to_numeric(mask)); |
| |
| return buf; |
| } |
| |
| static struct in_addr *__numeric_to_ipaddr(const char *dotted, bool is_mask) |
| { |
| static struct in_addr addr; |
| unsigned char *addrp; |
| unsigned int onebyte; |
| char buf[20], *p, *q; |
| int i; |
| |
| /* copy dotted string, because we need to modify it */ |
| strncpy(buf, dotted, sizeof(buf) - 1); |
| buf[sizeof(buf) - 1] = '\0'; |
| addrp = (void *)&addr.s_addr; |
| |
| p = buf; |
| for (i = 0; i < 3; ++i) { |
| if ((q = strchr(p, '.')) == NULL) { |
| if (is_mask) |
| return NULL; |
| |
| /* autocomplete, this is a network address */ |
| if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
| return NULL; |
| |
| addrp[i] = onebyte; |
| while (i < 3) |
| addrp[++i] = 0; |
| |
| return &addr; |
| } |
| |
| *q = '\0'; |
| if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
| return NULL; |
| |
| addrp[i] = onebyte; |
| p = q + 1; |
| } |
| |
| /* we have checked 3 bytes, now we check the last one */ |
| if (!xtables_strtoui(p, NULL, &onebyte, 0, UINT8_MAX)) |
| return NULL; |
| |
| addrp[3] = onebyte; |
| return &addr; |
| } |
| |
| struct in_addr *xtables_numeric_to_ipaddr(const char *dotted) |
| { |
| return __numeric_to_ipaddr(dotted, false); |
| } |
| |
| struct in_addr *xtables_numeric_to_ipmask(const char *dotted) |
| { |
| return __numeric_to_ipaddr(dotted, true); |
| } |
| |
| static struct in_addr *network_to_ipaddr(const char *name) |
| { |
| static struct in_addr addr; |
| struct netent *net; |
| |
| if ((net = getnetbyname(name)) != NULL) { |
| if (net->n_addrtype != AF_INET) |
| return NULL; |
| addr.s_addr = htonl(net->n_net); |
| return &addr; |
| } |
| |
| return NULL; |
| } |
| |
| static struct in_addr *host_to_ipaddr(const char *name, unsigned int *naddr) |
| { |
| struct hostent *host; |
| struct in_addr *addr; |
| unsigned int i; |
| |
| *naddr = 0; |
| if ((host = gethostbyname(name)) != NULL) { |
| if (host->h_addrtype != AF_INET || |
| host->h_length != sizeof(struct in_addr)) |
| return NULL; |
| |
| while (host->h_addr_list[*naddr] != NULL) |
| ++*naddr; |
| addr = xtables_calloc(*naddr, sizeof(struct in_addr) * *naddr); |
| for (i = 0; i < *naddr; i++) |
| memcpy(&addr[i], host->h_addr_list[i], |
| sizeof(struct in_addr)); |
| return addr; |
| } |
| |
| return NULL; |
| } |
| |
| static struct in_addr * |
| ipparse_hostnetwork(const char *name, unsigned int *naddrs) |
| { |
| struct in_addr *addrptmp, *addrp; |
| |
| if ((addrptmp = xtables_numeric_to_ipaddr(name)) != NULL || |
| (addrptmp = network_to_ipaddr(name)) != NULL) { |
| addrp = xtables_malloc(sizeof(struct in_addr)); |
| memcpy(addrp, addrptmp, sizeof(*addrp)); |
| *naddrs = 1; |
| return addrp; |
| } |
| if ((addrptmp = host_to_ipaddr(name, naddrs)) != NULL) |
| return addrptmp; |
| |
| xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
| } |
| |
| static struct in_addr *parse_ipmask(const char *mask) |
| { |
| static struct in_addr maskaddr; |
| struct in_addr *addrp; |
| unsigned int bits; |
| |
| if (mask == NULL) { |
| /* no mask at all defaults to 32 bits */ |
| maskaddr.s_addr = 0xFFFFFFFF; |
| return &maskaddr; |
| } |
| if ((addrp = xtables_numeric_to_ipmask(mask)) != NULL) |
| /* dotted_to_addr already returns a network byte order addr */ |
| return addrp; |
| if (!xtables_strtoui(mask, NULL, &bits, 0, 32)) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "invalid mask `%s' specified", mask); |
| if (bits != 0) { |
| maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits)); |
| return &maskaddr; |
| } |
| |
| maskaddr.s_addr = 0U; |
| return &maskaddr; |
| } |
| |
| void xtables_ipparse_multiple(const char *name, struct in_addr **addrpp, |
| struct in_addr **maskpp, unsigned int *naddrs) |
| { |
| struct in_addr *addrp; |
| char buf[256], *p; |
| unsigned int len, i, j, n, count = 1; |
| const char *loop = name; |
| |
| while ((loop = strchr(loop, ',')) != NULL) { |
| ++count; |
| ++loop; /* skip ',' */ |
| } |
| |
| *addrpp = xtables_malloc(sizeof(struct in_addr) * count); |
| *maskpp = xtables_malloc(sizeof(struct in_addr) * count); |
| |
| loop = name; |
| |
| for (i = 0; i < count; ++i) { |
| if (loop == NULL) |
| break; |
| if (*loop == ',') |
| ++loop; |
| if (*loop == '\0') |
| break; |
| p = strchr(loop, ','); |
| if (p != NULL) |
| len = p - loop; |
| else |
| len = strlen(loop); |
| if (len == 0 || sizeof(buf) - 1 < len) |
| break; |
| |
| strncpy(buf, loop, len); |
| buf[len] = '\0'; |
| loop += len; |
| if ((p = strrchr(buf, '/')) != NULL) { |
| *p = '\0'; |
| addrp = parse_ipmask(p + 1); |
| } else { |
| addrp = parse_ipmask(NULL); |
| } |
| memcpy(*maskpp + i, addrp, sizeof(*addrp)); |
| |
| /* if a null mask is given, the name is ignored, like in "any/0" */ |
| if ((*maskpp + i)->s_addr == 0) |
| /* |
| * A bit pointless to process multiple addresses |
| * in this case... |
| */ |
| strcpy(buf, "0.0.0.0"); |
| |
| addrp = ipparse_hostnetwork(buf, &n); |
| if (n > 1) { |
| count += n - 1; |
| *addrpp = xtables_realloc(*addrpp, |
| sizeof(struct in_addr) * count); |
| *maskpp = xtables_realloc(*maskpp, |
| sizeof(struct in_addr) * count); |
| for (j = 0; j < n; ++j) |
| /* for each new addr */ |
| memcpy(*addrpp + i + j, addrp + j, |
| sizeof(*addrp)); |
| for (j = 1; j < n; ++j) |
| /* for each new mask */ |
| memcpy(*maskpp + i + j, *maskpp + i, |
| sizeof(*addrp)); |
| i += n - 1; |
| } else { |
| memcpy(*addrpp + i, addrp, sizeof(*addrp)); |
| } |
| /* free what ipparse_hostnetwork had allocated: */ |
| free(addrp); |
| } |
| *naddrs = count; |
| for (i = 0; i < n; ++i) |
| (*addrpp+i)->s_addr &= (*maskpp+i)->s_addr; |
| } |
| |
| |
| /** |
| * xtables_ipparse_any - transform arbitrary name to in_addr |
| * |
| * Possible inputs (pseudo regex): |
| * m{^($hostname|$networkname|$ipaddr)(/$mask)?} |
| * "1.2.3.4/5", "1.2.3.4", "hostname", "networkname" |
| */ |
| void xtables_ipparse_any(const char *name, struct in_addr **addrpp, |
| struct in_addr *maskp, unsigned int *naddrs) |
| { |
| unsigned int i, j, k, n; |
| struct in_addr *addrp; |
| char buf[256], *p; |
| |
| strncpy(buf, name, sizeof(buf) - 1); |
| buf[sizeof(buf) - 1] = '\0'; |
| if ((p = strrchr(buf, '/')) != NULL) { |
| *p = '\0'; |
| addrp = parse_ipmask(p + 1); |
| } else { |
| addrp = parse_ipmask(NULL); |
| } |
| memcpy(maskp, addrp, sizeof(*maskp)); |
| |
| /* if a null mask is given, the name is ignored, like in "any/0" */ |
| if (maskp->s_addr == 0U) |
| strcpy(buf, "0.0.0.0"); |
| |
| addrp = *addrpp = ipparse_hostnetwork(buf, naddrs); |
| n = *naddrs; |
| for (i = 0, j = 0; i < n; ++i) { |
| addrp[j++].s_addr &= maskp->s_addr; |
| for (k = 0; k < j - 1; ++k) |
| if (addrp[k].s_addr == addrp[j-1].s_addr) { |
| --*naddrs; |
| --j; |
| break; |
| } |
| } |
| } |
| |
| const char *xtables_ip6addr_to_numeric(const struct in6_addr *addrp) |
| { |
| /* 0000:0000:0000:0000:0000:000.000.000.000 |
| * 0000:0000:0000:0000:0000:0000:0000:0000 */ |
| static char buf[50+1]; |
| return inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); |
| } |
| |
| static const char *ip6addr_to_host(const struct in6_addr *addr) |
| { |
| static char hostname[NI_MAXHOST]; |
| struct sockaddr_in6 saddr; |
| int err; |
| |
| memset(&saddr, 0, sizeof(struct sockaddr_in6)); |
| memcpy(&saddr.sin6_addr, addr, sizeof(*addr)); |
| saddr.sin6_family = AF_INET6; |
| |
| err = getnameinfo((const void *)&saddr, sizeof(struct sockaddr_in6), |
| hostname, sizeof(hostname) - 1, NULL, 0, 0); |
| if (err != 0) { |
| #ifdef DEBUG |
| fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); |
| #endif |
| return NULL; |
| } |
| |
| #ifdef DEBUG |
| fprintf (stderr, "\naddr2host: %s\n", hostname); |
| #endif |
| return hostname; |
| } |
| |
| const char *xtables_ip6addr_to_anyname(const struct in6_addr *addr) |
| { |
| const char *name; |
| |
| if ((name = ip6addr_to_host(addr)) != NULL) |
| return name; |
| |
| return xtables_ip6addr_to_numeric(addr); |
| } |
| |
| static int ip6addr_prefix_length(const struct in6_addr *k) |
| { |
| unsigned int bits = 0; |
| uint32_t a, b, c, d; |
| |
| a = ntohl(k->s6_addr32[0]); |
| b = ntohl(k->s6_addr32[1]); |
| c = ntohl(k->s6_addr32[2]); |
| d = ntohl(k->s6_addr32[3]); |
| while (a & 0x80000000U) { |
| ++bits; |
| a <<= 1; |
| a |= (b >> 31) & 1; |
| b <<= 1; |
| b |= (c >> 31) & 1; |
| c <<= 1; |
| c |= (d >> 31) & 1; |
| d <<= 1; |
| } |
| if (a != 0 || b != 0 || c != 0 || d != 0) |
| return -1; |
| return bits; |
| } |
| |
| const char *xtables_ip6mask_to_numeric(const struct in6_addr *addrp) |
| { |
| static char buf[50+2]; |
| int l = ip6addr_prefix_length(addrp); |
| |
| if (l == -1) { |
| strcpy(buf, "/"); |
| strcat(buf, xtables_ip6addr_to_numeric(addrp)); |
| return buf; |
| } |
| sprintf(buf, "/%d", l); |
| return buf; |
| } |
| |
| struct in6_addr *xtables_numeric_to_ip6addr(const char *num) |
| { |
| static struct in6_addr ap; |
| int err; |
| |
| if ((err = inet_pton(AF_INET6, num, &ap)) == 1) |
| return ≈ |
| #ifdef DEBUG |
| fprintf(stderr, "\nnumeric2addr: %d\n", err); |
| #endif |
| return NULL; |
| } |
| |
| static struct in6_addr * |
| host_to_ip6addr(const char *name, unsigned int *naddr) |
| { |
| static struct in6_addr *addr; |
| struct addrinfo hints; |
| struct addrinfo *res; |
| int err; |
| |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_flags = AI_CANONNAME; |
| hints.ai_family = AF_INET6; |
| hints.ai_socktype = SOCK_RAW; |
| hints.ai_protocol = IPPROTO_IPV6; |
| hints.ai_next = NULL; |
| |
| *naddr = 0; |
| if ((err = getaddrinfo(name, NULL, &hints, &res)) != 0) { |
| #ifdef DEBUG |
| fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); |
| #endif |
| return NULL; |
| } else { |
| if (res->ai_family != AF_INET6 || |
| res->ai_addrlen != sizeof(struct sockaddr_in6)) |
| return NULL; |
| |
| #ifdef DEBUG |
| fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, |
| xtables_ip6addr_to_numeric(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)); |
| #endif |
| /* Get the first element of the address-chain */ |
| addr = xtables_malloc(sizeof(struct in6_addr)); |
| memcpy(addr, &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr, |
| sizeof(struct in6_addr)); |
| freeaddrinfo(res); |
| *naddr = 1; |
| return addr; |
| } |
| |
| return NULL; |
| } |
| |
| static struct in6_addr *network_to_ip6addr(const char *name) |
| { |
| /* abort();*/ |
| /* TODO: not implemented yet, but the exception breaks the |
| * name resolvation */ |
| return NULL; |
| } |
| |
| static struct in6_addr * |
| ip6parse_hostnetwork(const char *name, unsigned int *naddrs) |
| { |
| struct in6_addr *addrp, *addrptmp; |
| |
| if ((addrptmp = xtables_numeric_to_ip6addr(name)) != NULL || |
| (addrptmp = network_to_ip6addr(name)) != NULL) { |
| addrp = xtables_malloc(sizeof(struct in6_addr)); |
| memcpy(addrp, addrptmp, sizeof(*addrp)); |
| *naddrs = 1; |
| return addrp; |
| } |
| if ((addrp = host_to_ip6addr(name, naddrs)) != NULL) |
| return addrp; |
| |
| xt_params->exit_err(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
| } |
| |
| static struct in6_addr *parse_ip6mask(char *mask) |
| { |
| static struct in6_addr maskaddr; |
| struct in6_addr *addrp; |
| unsigned int bits; |
| |
| if (mask == NULL) { |
| /* no mask at all defaults to 128 bits */ |
| memset(&maskaddr, 0xff, sizeof maskaddr); |
| return &maskaddr; |
| } |
| if ((addrp = xtables_numeric_to_ip6addr(mask)) != NULL) |
| return addrp; |
| if (!xtables_strtoui(mask, NULL, &bits, 0, 128)) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "invalid mask `%s' specified", mask); |
| if (bits != 0) { |
| char *p = (void *)&maskaddr; |
| memset(p, 0xff, bits / 8); |
| memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); |
| p[bits/8] = 0xff << (8 - (bits & 7)); |
| return &maskaddr; |
| } |
| |
| memset(&maskaddr, 0, sizeof(maskaddr)); |
| return &maskaddr; |
| } |
| |
| void |
| xtables_ip6parse_multiple(const char *name, struct in6_addr **addrpp, |
| struct in6_addr **maskpp, unsigned int *naddrs) |
| { |
| static const struct in6_addr zero_addr; |
| struct in6_addr *addrp; |
| char buf[256], *p; |
| unsigned int len, i, j, n, count = 1; |
| const char *loop = name; |
| |
| while ((loop = strchr(loop, ',')) != NULL) { |
| ++count; |
| ++loop; /* skip ',' */ |
| } |
| |
| *addrpp = xtables_malloc(sizeof(struct in6_addr) * count); |
| *maskpp = xtables_malloc(sizeof(struct in6_addr) * count); |
| |
| loop = name; |
| |
| for (i = 0; i < count /*NB: count can grow*/; ++i) { |
| if (loop == NULL) |
| break; |
| if (*loop == ',') |
| ++loop; |
| if (*loop == '\0') |
| break; |
| p = strchr(loop, ','); |
| if (p != NULL) |
| len = p - loop; |
| else |
| len = strlen(loop); |
| if (len == 0 || sizeof(buf) - 1 < len) |
| break; |
| |
| strncpy(buf, loop, len); |
| buf[len] = '\0'; |
| loop += len; |
| if ((p = strrchr(buf, '/')) != NULL) { |
| *p = '\0'; |
| addrp = parse_ip6mask(p + 1); |
| } else { |
| addrp = parse_ip6mask(NULL); |
| } |
| memcpy(*maskpp + i, addrp, sizeof(*addrp)); |
| |
| /* if a null mask is given, the name is ignored, like in "any/0" */ |
| if (memcmp(*maskpp + i, &zero_addr, sizeof(zero_addr)) == 0) |
| strcpy(buf, "::"); |
| |
| addrp = ip6parse_hostnetwork(buf, &n); |
| /* ip6parse_hostnetwork only ever returns one IP |
| address (it exits if the resolution fails). |
| Therefore, n will always be 1 here. Leaving the |
| code below in anyway in case ip6parse_hostnetwork |
| is improved some day to behave like |
| ipparse_hostnetwork: */ |
| if (n > 1) { |
| count += n - 1; |
| *addrpp = xtables_realloc(*addrpp, |
| sizeof(struct in6_addr) * count); |
| *maskpp = xtables_realloc(*maskpp, |
| sizeof(struct in6_addr) * count); |
| for (j = 0; j < n; ++j) |
| /* for each new addr */ |
| memcpy(*addrpp + i + j, addrp + j, |
| sizeof(*addrp)); |
| for (j = 1; j < n; ++j) |
| /* for each new mask */ |
| memcpy(*maskpp + i + j, *maskpp + i, |
| sizeof(*addrp)); |
| i += n - 1; |
| } else { |
| memcpy(*addrpp + i, addrp, sizeof(*addrp)); |
| } |
| /* free what ip6parse_hostnetwork had allocated: */ |
| free(addrp); |
| } |
| *naddrs = count; |
| for (i = 0; i < n; ++i) |
| for (j = 0; j < 4; ++j) |
| (*addrpp+i)->s6_addr32[j] &= (*maskpp+i)->s6_addr32[j]; |
| } |
| |
| void xtables_ip6parse_any(const char *name, struct in6_addr **addrpp, |
| struct in6_addr *maskp, unsigned int *naddrs) |
| { |
| static const struct in6_addr zero_addr; |
| struct in6_addr *addrp; |
| unsigned int i, j, k, n; |
| char buf[256], *p; |
| |
| strncpy(buf, name, sizeof(buf) - 1); |
| buf[sizeof(buf)-1] = '\0'; |
| if ((p = strrchr(buf, '/')) != NULL) { |
| *p = '\0'; |
| addrp = parse_ip6mask(p + 1); |
| } else { |
| addrp = parse_ip6mask(NULL); |
| } |
| memcpy(maskp, addrp, sizeof(*maskp)); |
| |
| /* if a null mask is given, the name is ignored, like in "any/0" */ |
| if (memcmp(maskp, &zero_addr, sizeof(zero_addr)) == 0) |
| strcpy(buf, "::"); |
| |
| addrp = *addrpp = ip6parse_hostnetwork(buf, naddrs); |
| n = *naddrs; |
| for (i = 0, j = 0; i < n; ++i) { |
| for (k = 0; k < 4; ++k) |
| addrp[j].s6_addr32[k] &= maskp->s6_addr32[k]; |
| ++j; |
| for (k = 0; k < j - 1; ++k) |
| if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { |
| --*naddrs; |
| --j; |
| break; |
| } |
| } |
| } |
| |
| void xtables_save_string(const char *value) |
| { |
| static const char no_quote_chars[] = "_-0123456789" |
| "abcdefghijklmnopqrstuvwxyz" |
| "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| static const char escape_chars[] = "\"\\'"; |
| size_t length; |
| const char *p; |
| |
| length = strcspn(value, no_quote_chars); |
| if (length > 0 && value[length] == 0) { |
| /* no quoting required */ |
| fputs(value, stdout); |
| putchar(' '); |
| } else { |
| /* there is at least one dangerous character in the |
| value, which we have to quote. Write double quotes |
| around the value and escape special characters with |
| a backslash */ |
| putchar('"'); |
| |
| for (p = strpbrk(value, escape_chars); p != NULL; |
| p = strpbrk(value, escape_chars)) { |
| if (p > value) |
| fwrite(value, 1, p - value, stdout); |
| putchar('\\'); |
| putchar(*p); |
| value = p + 1; |
| } |
| |
| /* print the rest and finish the double quoted |
| string */ |
| fputs(value, stdout); |
| printf("\" "); |
| } |
| } |
| |
| /** |
| * Check for option-intrapositional negation. |
| * Do not use in new code. |
| */ |
| int xtables_check_inverse(const char option[], int *invert, |
| int *my_optind, int argc, char **argv) |
| { |
| if (option == NULL || strcmp(option, "!") != 0) |
| return false; |
| |
| fprintf(stderr, "Using intrapositioned negation " |
| "(`--option ! this`) is deprecated in favor of " |
| "extrapositioned (`! --option this`).\n"); |
| |
| if (*invert) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "Multiple `!' flags not allowed"); |
| *invert = true; |
| if (my_optind != NULL) { |
| optarg = argv[*my_optind]; |
| ++*my_optind; |
| if (argc && *my_optind > argc) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "no argument following `!'"); |
| } |
| |
| return true; |
| } |
| |
| const struct xtables_pprot xtables_chain_protos[] = { |
| {"tcp", IPPROTO_TCP}, |
| {"sctp", IPPROTO_SCTP}, |
| {"udp", IPPROTO_UDP}, |
| {"udplite", IPPROTO_UDPLITE}, |
| {"icmp", IPPROTO_ICMP}, |
| {"icmpv6", IPPROTO_ICMPV6}, |
| {"ipv6-icmp", IPPROTO_ICMPV6}, |
| {"esp", IPPROTO_ESP}, |
| {"ah", IPPROTO_AH}, |
| {"ipv6-mh", IPPROTO_MH}, |
| {"mh", IPPROTO_MH}, |
| {"all", 0}, |
| {NULL}, |
| }; |
| |
| u_int16_t |
| xtables_parse_protocol(const char *s) |
| { |
| unsigned int proto; |
| |
| if (!xtables_strtoui(s, NULL, &proto, 0, UINT8_MAX)) { |
| struct protoent *pent; |
| |
| /* first deal with the special case of 'all' to prevent |
| * people from being able to redefine 'all' in nsswitch |
| * and/or provoke expensive [not working] ldap/nis/... |
| * lookups */ |
| if (!strcmp(s, "all")) |
| return 0; |
| |
| if ((pent = getprotobyname(s))) |
| proto = pent->p_proto; |
| else { |
| unsigned int i; |
| for (i = 0; i < ARRAY_SIZE(xtables_chain_protos); ++i) { |
| if (xtables_chain_protos[i].name == NULL) |
| continue; |
| |
| if (strcmp(s, xtables_chain_protos[i].name) == 0) { |
| proto = xtables_chain_protos[i].num; |
| break; |
| } |
| } |
| if (i == ARRAY_SIZE(xtables_chain_protos)) |
| xt_params->exit_err(PARAMETER_PROBLEM, |
| "unknown protocol `%s' specified", |
| s); |
| } |
| } |
| |
| return proto; |
| } |