Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2009 Roy Marples <roy@marples.name> |
| 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/socket.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <sys/un.h> |
| 31 | |
| 32 | #include <errno.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | #include <time.h> |
| 37 | #include <unistd.h> |
| 38 | |
| 39 | #include "config.h" |
| 40 | #include "common.h" |
| 41 | #include "dhcpcd.h" |
| 42 | #include "control.h" |
| 43 | #include "eloop.h" |
| 44 | |
| 45 | static int fd = -1; |
| 46 | static char buffer[1024]; |
| 47 | static char *argvp[255]; |
| 48 | |
| 49 | struct sockaddr_un sun; |
| 50 | struct fd_list *fds = NULL; |
| 51 | |
| 52 | static void |
| 53 | remove_control_data(void *arg) |
| 54 | { |
| 55 | struct fd_list *l, *last = NULL; |
| 56 | |
| 57 | for (l = fds; l != NULL; l = l->next) { |
| 58 | if (l == arg) { |
| 59 | close(l->fd); |
| 60 | delete_event(l->fd); |
| 61 | if (last == NULL) |
| 62 | fds = l->next; |
| 63 | else |
| 64 | last->next = l->next; |
| 65 | free(l); |
| 66 | break; |
| 67 | } |
| 68 | last = l; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | static void |
| 73 | handle_control_data(void *arg) |
| 74 | { |
| 75 | struct fd_list *l = arg; |
| 76 | ssize_t bytes; |
| 77 | int argc; |
| 78 | char *e, *p; |
| 79 | char **ap; |
| 80 | |
| 81 | bytes = read(l->fd, buffer, sizeof(buffer) - 1); |
| 82 | if (bytes == -1 || bytes == 0) { |
| 83 | remove_control_data(l); |
| 84 | return; |
| 85 | } |
| 86 | buffer[bytes] = '\0'; |
| 87 | p = buffer; |
| 88 | e = buffer + bytes; |
| 89 | argc = 0; |
| 90 | ap = argvp; |
| 91 | while (p < e && (size_t)argc < sizeof(argvp)) { |
| 92 | argc++; |
| 93 | *ap++ = p; |
| 94 | p += strlen(p) + 1; |
| 95 | } |
| 96 | handle_args(l, argc, argvp); |
| 97 | } |
| 98 | |
| 99 | /* ARGSUSED */ |
| 100 | static void |
| 101 | handle_control(_unused void *arg) |
| 102 | { |
| 103 | struct sockaddr_un run; |
| 104 | socklen_t len; |
| 105 | struct fd_list *l; |
| 106 | int f; |
| 107 | |
| 108 | len = sizeof(run); |
| 109 | if ((f = accept(fd, (struct sockaddr *)&run, &len)) == -1) |
| 110 | return; |
| 111 | l = xmalloc(sizeof(*l)); |
| 112 | l->fd = f; |
| 113 | l->listener = 0; |
| 114 | l->next = fds; |
| 115 | fds = l; |
| 116 | add_event(l->fd, handle_control_data, l); |
| 117 | } |
| 118 | |
| 119 | static int |
| 120 | make_sock(void) |
| 121 | { |
| 122 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) |
| 123 | return -1; |
| 124 | memset(&sun, 0, sizeof(sun)); |
| 125 | sun.sun_family = AF_UNIX; |
| 126 | strlcpy(sun.sun_path, CONTROLSOCKET, sizeof(sun.sun_path)); |
| 127 | return sizeof(sun.sun_family) + strlen(sun.sun_path) + 1; |
| 128 | } |
| 129 | |
| 130 | int |
| 131 | start_control(void) |
| 132 | { |
| 133 | int len; |
| 134 | |
| 135 | if ((len = make_sock()) == -1) |
| 136 | return -1; |
| 137 | unlink(CONTROLSOCKET); |
| 138 | if (bind(fd, (struct sockaddr *)&sun, len) == -1 || |
| 139 | chmod(CONTROLSOCKET, |
| 140 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) == -1 || |
| 141 | set_cloexec(fd) == -1 || |
| 142 | set_nonblock(fd) == -1 || |
| 143 | listen(fd, sizeof(fds)) == -1) |
| 144 | { |
| 145 | close(fd); |
| 146 | return -1; |
| 147 | } |
| 148 | add_event(fd, handle_control, NULL); |
| 149 | return fd; |
| 150 | } |
| 151 | |
| 152 | int |
| 153 | stop_control(void) |
| 154 | { |
| 155 | int retval = 0; |
| 156 | struct fd_list *l, *ll; |
| 157 | |
| 158 | delete_event(fd); |
| 159 | if (shutdown(fd, SHUT_RDWR) == -1) |
| 160 | retval = 1; |
| 161 | fd = -1; |
| 162 | if (unlink(CONTROLSOCKET) == -1) |
| 163 | retval = -1; |
| 164 | |
| 165 | l = fds; |
| 166 | while (l != NULL) { |
| 167 | ll = l->next; |
| 168 | delete_event(l->fd); |
| 169 | shutdown(l->fd, SHUT_RDWR); |
| 170 | free(l); |
| 171 | l = ll; |
| 172 | } |
| 173 | |
| 174 | return retval; |
| 175 | } |
| 176 | |
| 177 | int |
| 178 | open_control(void) |
| 179 | { |
| 180 | int len; |
| 181 | |
| 182 | if ((len = make_sock()) == -1) |
| 183 | return -1; |
| 184 | return connect(fd, (struct sockaddr *)&sun, len); |
| 185 | } |
| 186 | |
| 187 | int |
| 188 | send_control(int argc, char * const *argv) |
| 189 | { |
| 190 | char *p = buffer; |
| 191 | int i; |
| 192 | size_t len; |
| 193 | |
| 194 | if (argc > 255) { |
| 195 | errno = ENOBUFS; |
| 196 | return -1; |
| 197 | } |
| 198 | for (i = 0; i < argc; i++) { |
| 199 | len = strlen(argv[i]) + 1; |
| 200 | if ((p - buffer) + len > sizeof(buffer)) { |
| 201 | errno = ENOBUFS; |
| 202 | return -1; |
| 203 | } |
| 204 | memcpy(p, argv[i], len); |
| 205 | p += len; |
| 206 | } |
| 207 | return write(fd, buffer, p - buffer); |
| 208 | } |