1 /* 2 * ipmaddr.c "ip maddress". 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru> 10 * 11 */ 12 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 #include <syslog.h> 17 #include <fcntl.h> 18 #include <sys/ioctl.h> 19 #include <sys/socket.h> 20 #include <netinet/in.h> 21 #include <arpa/inet.h> 22 #include <string.h> 23 24 #include <linux/netdevice.h> 25 #include <linux/if.h> 26 #include <linux/if_arp.h> 27 #include <linux/sockios.h> 28 29 #include "rt_names.h" 30 #include "utils.h" 31 #include "ip_common.h" 32 33 static struct { 34 char *dev; 35 int family; 36 } filter; 37 38 static void usage(void) __attribute__((noreturn)); 39 40 static void usage(void) 41 { 42 fprintf(stderr, "Usage: ip maddr [ add | del ] MULTIADDR dev STRING\n"); 43 fprintf(stderr, " ip maddr show [ dev STRING ]\n"); 44 exit(-1); 45 } 46 47 static int parse_hex(char *str, unsigned char *addr, size_t size) 48 { 49 int len = 0; 50 51 while (*str && (len < 2 * size)) { 52 int tmp; 53 if (str[1] == 0) 54 return -1; 55 if (sscanf(str, "%02x", &tmp) != 1) 56 return -1; 57 addr[len] = tmp; 58 len++; 59 str += 2; 60 } 61 return len; 62 } 63 64 struct ma_info 65 { 66 struct ma_info *next; 67 int index; 68 int users; 69 char *features; 70 char name[IFNAMSIZ]; 71 inet_prefix addr; 72 }; 73 74 static void maddr_ins(struct ma_info **lst, struct ma_info *m) 75 { 76 struct ma_info *mp; 77 78 for (; (mp = *lst) != NULL; lst = &mp->next) { 79 if (mp->index > m->index) 80 break; 81 } 82 m->next = *lst; 83 *lst = m; 84 } 85 86 static void read_dev_mcast(struct ma_info **result_p) 87 { 88 char buf[256]; 89 FILE *fp = fopen("/proc/net/dev_mcast", "r"); 90 91 if (!fp) 92 return; 93 94 while (fgets(buf, sizeof(buf), fp)) { 95 char hexa[256]; 96 struct ma_info m; 97 int len; 98 int st; 99 100 memset(&m, 0, sizeof(m)); 101 sscanf(buf, "%d%s%d%d%s", &m.index, m.name, &m.users, &st, 102 hexa); 103 if (filter.dev && strcmp(filter.dev, m.name)) 104 continue; 105 106 m.addr.family = AF_PACKET; 107 108 len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data)); 109 if (len >= 0) { 110 struct ma_info *ma = malloc(sizeof(m)); 111 112 memcpy(ma, &m, sizeof(m)); 113 ma->addr.bytelen = len; 114 ma->addr.bitlen = len<<3; 115 if (st) 116 ma->features = "static"; 117 maddr_ins(result_p, ma); 118 } 119 } 120 fclose(fp); 121 } 122 123 static void read_igmp(struct ma_info **result_p) 124 { 125 struct ma_info m; 126 char buf[256]; 127 FILE *fp = fopen("/proc/net/igmp", "r"); 128 129 if (!fp) 130 return; 131 memset(&m, 0, sizeof(m)); 132 if (!fgets(buf, sizeof(buf), fp)) { 133 fclose(fp); 134 return; 135 } 136 137 m.addr.family = AF_INET; 138 m.addr.bitlen = 32; 139 m.addr.bytelen = 4; 140 141 while (fgets(buf, sizeof(buf), fp)) { 142 struct ma_info *ma; 143 144 if (buf[0] != '\t') { 145 sscanf(buf, "%d%s", &m.index, m.name); 146 continue; 147 } 148 149 if (filter.dev && strcmp(filter.dev, m.name)) 150 continue; 151 152 sscanf(buf, "%08x%d", (__u32*)&m.addr.data, &m.users); 153 154 ma = malloc(sizeof(m)); 155 memcpy(ma, &m, sizeof(m)); 156 maddr_ins(result_p, ma); 157 } 158 fclose(fp); 159 } 160 161 162 static void read_igmp6(struct ma_info **result_p) 163 { 164 char buf[256]; 165 FILE *fp = fopen("/proc/net/igmp6", "r"); 166 167 if (!fp) 168 return; 169 170 while (fgets(buf, sizeof(buf), fp)) { 171 char hexa[256]; 172 struct ma_info m; 173 int len; 174 175 memset(&m, 0, sizeof(m)); 176 sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users); 177 178 if (filter.dev && strcmp(filter.dev, m.name)) 179 continue; 180 181 m.addr.family = AF_INET6; 182 183 len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data)); 184 if (len >= 0) { 185 struct ma_info *ma = malloc(sizeof(m)); 186 187 memcpy(ma, &m, sizeof(m)); 188 189 ma->addr.bytelen = len; 190 ma->addr.bitlen = len<<3; 191 maddr_ins(result_p, ma); 192 } 193 } 194 fclose(fp); 195 } 196 197 static void print_maddr(FILE *fp, struct ma_info *list) 198 { 199 fprintf(fp, "\t"); 200 201 if (list->addr.family == AF_PACKET) { 202 SPRINT_BUF(b1); 203 fprintf(fp, "link %s", ll_addr_n2a((unsigned char*)list->addr.data, 204 list->addr.bytelen, 0, 205 b1, sizeof(b1))); 206 } else { 207 char abuf[256]; 208 switch(list->addr.family) { 209 case AF_INET: 210 fprintf(fp, "inet "); 211 break; 212 case AF_INET6: 213 fprintf(fp, "inet6 "); 214 break; 215 default: 216 fprintf(fp, "family %d ", list->addr.family); 217 break; 218 } 219 fprintf(fp, "%s", 220 format_host(list->addr.family, 221 -1, 222 list->addr.data, 223 abuf, sizeof(abuf))); 224 } 225 if (list->users != 1) 226 fprintf(fp, " users %d", list->users); 227 if (list->features) 228 fprintf(fp, " %s", list->features); 229 fprintf(fp, "\n"); 230 } 231 232 static void print_mlist(FILE *fp, struct ma_info *list) 233 { 234 int cur_index = 0; 235 236 for (; list; list = list->next) { 237 if (oneline) { 238 cur_index = list->index; 239 fprintf(fp, "%d:\t%s%s", cur_index, list->name, _SL_); 240 } else if (cur_index != list->index) { 241 cur_index = list->index; 242 fprintf(fp, "%d:\t%s\n", cur_index, list->name); 243 } 244 print_maddr(fp, list); 245 } 246 } 247 248 static int multiaddr_list(int argc, char **argv) 249 { 250 struct ma_info *list = NULL; 251 252 if (!filter.family) 253 filter.family = preferred_family; 254 255 while (argc > 0) { 256 if (1) { 257 if (strcmp(*argv, "dev") == 0) { 258 NEXT_ARG(); 259 } 260 else if (matches(*argv, "help") == 0) 261 usage(); 262 if (filter.dev) 263 duparg2("dev", *argv); 264 filter.dev = *argv; 265 } 266 argv++; argc--; 267 } 268 269 if (!filter.family || filter.family == AF_PACKET) 270 read_dev_mcast(&list); 271 if (!filter.family || filter.family == AF_INET) 272 read_igmp(&list); 273 if (!filter.family || filter.family == AF_INET6) 274 read_igmp6(&list); 275 print_mlist(stdout, list); 276 return 0; 277 } 278 279 static int multiaddr_modify(int cmd, int argc, char **argv) 280 { 281 struct ifreq ifr; 282 int fd; 283 284 memset(&ifr, 0, sizeof(ifr)); 285 286 if (cmd == RTM_NEWADDR) 287 cmd = SIOCADDMULTI; 288 else 289 cmd = SIOCDELMULTI; 290 291 while (argc > 0) { 292 if (strcmp(*argv, "dev") == 0) { 293 NEXT_ARG(); 294 if (ifr.ifr_name[0]) 295 duparg("dev", *argv); 296 strncpy(ifr.ifr_name, *argv, IFNAMSIZ); 297 } else { 298 if (matches(*argv, "address") == 0) { 299 NEXT_ARG(); 300 } 301 if (matches(*argv, "help") == 0) 302 usage(); 303 if (ifr.ifr_hwaddr.sa_data[0]) 304 duparg("address", *argv); 305 if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data, 306 14, *argv) < 0) { 307 fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv); 308 exit(1); 309 } 310 } 311 argc--; argv++; 312 } 313 if (ifr.ifr_name[0] == 0) { 314 fprintf(stderr, "Not enough information: \"dev\" is required.\n"); 315 exit(-1); 316 } 317 318 fd = socket(AF_INET, SOCK_DGRAM, 0); 319 if (fd < 0) { 320 perror("Cannot create socket"); 321 exit(1); 322 } 323 if (ioctl(fd, cmd, (char*)&ifr) != 0) { 324 perror("ioctl"); 325 exit(1); 326 } 327 close(fd); 328 329 exit(0); 330 } 331 332 333 int do_multiaddr(int argc, char **argv) 334 { 335 if (argc < 1) 336 return multiaddr_list(0, NULL); 337 if (matches(*argv, "add") == 0) 338 return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1); 339 if (matches(*argv, "delete") == 0) 340 return multiaddr_modify(RTM_DELADDR, argc-1, argv+1); 341 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0 342 || matches(*argv, "lst") == 0) 343 return multiaddr_list(argc-1, argv+1); 344 if (matches(*argv, "help") == 0) 345 usage(); 346 fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv); 347 exit(-1); 348 } 349
