1/* ifconfig.c - Configure network interface. 2 * 3 * Copyright 2012 Ranjan Kumar <ranjankumar.bth@gmail.com> 4 * Copyright 2012 Kyungwan Han <asura321@gamil.com> 5 * Reviewed by Kyungsu Kim <kaspyx@gmail.com> 6 * 7 * Not in SUSv4. 8 * 9 * Obsolete fields included for historical purposes: 10 * irq|io_addr|mem_start ADDR - micromanage obsolete hardware 11 * outfill|keepalive INTEGER - SLIP analog dialup line quality monitoring 12 * metric INTEGER - added to Linux 0.9.10 with comment "never used", still true 13 14USE_IFCONFIG(NEWTOY(ifconfig, "^?aS", TOYFLAG_SBIN)) 15 16config IFCONFIG 17 bool "ifconfig" 18 default y 19 help 20 usage: ifconfig [-aS] [INTERFACE [ACTION...]] 21 22 Display or configure network interface. 23 24 With no arguments, display active interfaces. First argument is interface 25 to operate on, one argument by itself displays that interface. 26 27 -a All interfaces displayed, not just active ones 28 -S Short view, one line per interface 29 30 Standard ACTIONs to perform on an INTERFACE: 31 32 ADDR[/MASK] - set IPv4 address (1.2.3.4/5) and activate interface 33 add|del ADDR[/LEN] - add/remove IPv6 address (1111::8888/128) 34 up|down - activate or deactivate interface 35 36 Advanced ACTIONs (default values usually suffice): 37 38 default - remove IPv4 address 39 netmask ADDR - set IPv4 netmask via 255.255.255.0 instead of /24 40 txqueuelen LEN - number of buffered packets before output blocks 41 mtu LEN - size of outgoing packets (Maximum Transmission Unit) 42 broadcast ADDR - Set broadcast address 43 pointopoint ADDR - PPP and PPPOE use this instead of "route add default gw" 44 hw TYPE ADDR - set hardware (mac) address (type = ether|infiniband) 45 46 Flags you can set on an interface (or -remove by prefixing with -): 47 48 arp - don't use Address Resolution Protocol to map LAN routes 49 promisc - don't discard packets that aren't to this LAN hardware address 50 multicast - force interface into multicast mode if the driver doesn't 51 allmulti - promisc for multicast packets 52*/ 53 54#define FOR_ifconfig 55#include "toys.h" 56 57#include <net/if_arp.h> 58#include <net/ethernet.h> 59 60GLOBALS( 61 int sockfd; 62) 63 64// Convert hostname to binary address for AF_INET or AF_INET6 65// return /prefix (or range max if none) 66static int get_addrinfo(char *host, sa_family_t af, void *addr) 67{ 68 struct addrinfo hints, *result, *rp = 0; 69 int status, len; 70 char *from, *slash; 71 72 memset(&hints, 0 , sizeof(struct addrinfo)); 73 hints.ai_family = af; 74 hints.ai_socktype = SOCK_STREAM; 75 76 slash = strchr(host, '/'); 77 if (slash) *slash = 0; 78 79 status = getaddrinfo(host, NULL, &hints, &result); 80 if (!status) 81 for (rp = result; rp; rp = rp->ai_next) 82 if (rp->ai_family == af) break; 83 if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status)); 84 85 // ai_addr isn't struct in_addr or in6_addr, it's struct sockaddr. Of course. 86 // You'd think ipv4 and ipv6 would have some basic compatibility, but no. 87 from = ((char *)rp->ai_addr) + 4; 88 if (af == AF_INET6) { 89 len = 16; 90 from += 4; // skip "flowinfo" field ipv6 puts before address 91 } else len = 4; 92 memcpy(addr, from, len); 93 freeaddrinfo(result); 94 95 len = -1; 96 if (slash) len = atolx_range(slash+1, 0, (af == AF_INET) ? 32 : 128); 97 98 return len; 99} 100 101static void display_ifconfig(char *name, int always, unsigned long long val[]) 102{ 103 struct ifreq ifre; 104 struct sockaddr_in *si = (void *)&ifre.ifr_addr; 105 struct { 106 int type; 107 char *title; 108 } types[] = { 109 {ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"}, 110 {ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"}, 111 {ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"} 112 }; 113 int i; 114 char *pp; 115 FILE *fp; 116 short flags; 117 118 xstrncpy(ifre.ifr_name, name, IFNAMSIZ); 119 if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit_raw(name); 120 flags = ifre.ifr_flags; 121 if (!always && !(flags & IFF_UP)) return; 122 123 if (toys.optflags&FLAG_S) { 124 unsigned uu = 0; 125 int len; 126 127 ioctl(TT.sockfd, SIOCGIFADDR, &ifre); 128 len = printf("%*s %s", -9, name, inet_ntoa(si->sin_addr)); 129 if (!ioctl(TT.sockfd, SIOCGIFNETMASK, &ifre)) 130 uu = htonl(*(unsigned *)&(si->sin_addr)); 131 for (i = 0; uu; i++) uu <<= 1; 132 len += printf("/%d", i); 133 printf("%*c", 29-len, ' '); 134 } 135 136 // Query hardware type and hardware address. 137 // Not xioctl because you don't have permission for this on Android. 138 ioctl(TT.sockfd, SIOCGIFHWADDR, &ifre); 139 140 if (toys.optflags&FLAG_S) 141 for (i=0; i<6; i++) printf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]); 142 else { 143 for (i=0; i < ARRAY_LEN(types)-1; i++) 144 if (ifre.ifr_hwaddr.sa_family == types[i].type) break; 145 xprintf("%-9s Link encap:%s ", name, types[i].title); 146 if(ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) { 147 xprintf("HWaddr "); 148 for (i=0; i<6; i++) xprintf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]); 149 } 150 sprintf(toybuf, "/sys/class/net/%.15s/device/driver", name); 151 if (readlink0(toybuf, toybuf, sizeof(toybuf))>0) 152 if ((pp = strrchr(toybuf, '/'))) xprintf(" Driver %s", pp+1); 153 xputc('\n'); 154 } 155 156 // If an address is assigned record that. 157 158 ifre.ifr_addr.sa_family = AF_INET; 159 memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr)); 160 ioctl(TT.sockfd, SIOCGIFADDR, &ifre); 161 pp = (char *)&ifre.ifr_addr; 162 for (i = 0; i<sizeof(ifre.ifr_addr); i++) if (pp[i]) break; 163 164 if (!(toys.optflags&FLAG_S) && i != sizeof(ifre.ifr_addr)) { 165 struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr; 166 struct { 167 char *name; 168 int flag, ioctl; 169 } addr[] = { 170 {"addr", 0, 0}, 171 {"P-t-P", IFF_POINTOPOINT, SIOCGIFDSTADDR}, 172 {"Bcast", IFF_BROADCAST, SIOCGIFBRDADDR}, 173 {"Mask", 0, SIOCGIFNETMASK} 174 }; 175 176 // TODO: can this be ipv6? Why are we checking here when ipv6 source later? 177 xprintf("%10c%s", ' ', (si->sin_family == AF_INET) ? "inet" : 178 (si->sin_family == AF_INET6) ? "inet6" : "unspec"); 179 180 for (i=0; i<ARRAY_LEN(addr); i++) { 181 if (!addr[i].flag || (flags & addr[i].flag)) { 182 if (addr[i].ioctl && ioctl(TT.sockfd, addr[i].ioctl, &ifre)) 183 si->sin_family = 0; 184 xprintf(" %s:%s ", addr[i].name, 185 (si->sin_family == 0xFFFF || !si->sin_family) 186 ? "[NOT SET]" : inet_ntoa(si->sin_addr)); 187 } 188 } 189 190 xputc('\n'); 191 } 192 193 fp = fopen(pp = "/proc/net/if_inet6", "r"); 194 if (fp) { 195 char iface_name[IFNAMSIZ]; 196 int plen, iscope; 197 198 while (fgets(toybuf, sizeof(toybuf), fp)) { 199 int nitems; 200 char ipv6_addr[40]; 201 202 nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n", 203 ipv6_addr, &plen, &iscope, iface_name); 204 if (nitems<0 && feof(fp)) break; 205 if (nitems != 4) perror_exit("bad %s", pp); 206 207 if (!strcmp(name, iface_name)) { 208 struct sockaddr_in6 s6; 209 char *ptr = ipv6_addr+sizeof(ipv6_addr)-1; 210 211 // convert giant hex string into colon-spearated ipv6 address by 212 // inserting ':' every 4 characters. 213 for (i = 32; i; i--) 214 if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':'; 215 216 // Convert to binary and back to get abbreviated :: version 217 if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) { 218 if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) { 219 char *scopes[] = {"Global","Host","Link","Site","Compat"}, 220 *scope = "Unknown"; 221 222 for (i=0; i<ARRAY_LEN(scopes); i++) 223 if (iscope == (!!i)<<(i+3)) scope = scopes[i]; 224 if (toys.optflags&FLAG_S) xprintf(" %s/%d@%c", toybuf, plen,*scope); 225 else xprintf("%10cinet6 addr: %s/%d Scope: %s\n", 226 ' ', toybuf, plen, scope); 227 } 228 } 229 } 230 } 231 fclose(fp); 232 } 233 234 if (toys.optflags&FLAG_S) { 235 xputc('\n'); 236 return; 237 } 238 239 xprintf("%10c", ' '); 240 241 if (flags) { 242 unsigned short mask = 1; 243 char **s, *str[] = { 244 "UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS", 245 "RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST", 246 "PORTSEL", "AUTOMEDIA", "DYNAMIC", NULL 247 }; 248 249 for (s = str; *s; s++) { 250 if (flags & mask) xprintf("%s ", *s); 251 mask <<= 1; 252 } 253 } else xprintf("[NO FLAGS] "); 254 255 if (ioctl(TT.sockfd, SIOCGIFMTU, &ifre) < 0) ifre.ifr_mtu = 0; 256 xprintf(" MTU:%d", ifre.ifr_mtu); 257 if (ioctl(TT.sockfd, SIOCGIFMETRIC, &ifre) < 0) ifre.ifr_metric = 0; 258 if (!ifre.ifr_metric) ifre.ifr_metric = 1; 259 xprintf(" Metric:%d", ifre.ifr_metric); 260 261 // non-virtual interface 262 263 if (val) { 264 char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns", 265 "frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns", 266 "collisions", "carrier", 0, "txqueuelen"}; 267 signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1, 268 13, 16, -1, 0, 8}; 269 int i; 270 271 // Query txqueuelen 272 if (ioctl(TT.sockfd, SIOCGIFTXQLEN, &ifre) >= 0) val[16] = ifre.ifr_qlen; 273 else val[16] = -1; 274 275 for (i = 0; i<sizeof(order); i++) { 276 int j = order[i]; 277 278 if (j < 0) xprintf("\n%10c", ' '); 279 else xprintf("%s:%llu ", label[j], val[j]); 280 } 281 } 282 xputc('\n'); 283 284 if(!ioctl(TT.sockfd, SIOCGIFMAP, &ifre) && (ifre.ifr_map.irq || 285 ifre.ifr_map.mem_start || ifre.ifr_map.dma || ifre.ifr_map.base_addr)) 286 { 287 xprintf("%10c", ' '); 288 if(ifre.ifr_map.irq) xprintf("Interrupt:%d ", ifre.ifr_map.irq); 289 if(ifre.ifr_map.base_addr >= 0x100) // IO_MAP_INDEX 290 xprintf("Base address:0x%x ", ifre.ifr_map.base_addr); 291 if(ifre.ifr_map.mem_start) 292 xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end); 293 if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma); 294 xputc('\n'); 295 } 296 xputc('\n'); 297} 298 299static void show_iface(char *iface_name) 300{ 301 char *name; 302 struct string_list *ifaces = 0, *sl; 303 int i, j; 304 FILE *fp; 305 306 fp = xfopen("/proc/net/dev", "r"); 307 308 for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) { 309 char *buf = toybuf; 310 unsigned long long val[17]; 311 312 if (i<2) continue; 313 314 while (isspace(*buf)) buf++; 315 name = strsep(&buf, ":"); 316 if(!buf) error_exit("bad name %s", name); 317 318 errno = 0; 319 for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0); 320 if (errno) perror_exit("bad %s at %s", name, buf); 321 322 if (iface_name) { 323 if (!strcmp(iface_name, name)) { 324 display_ifconfig(iface_name, 1, val); 325 326 return; 327 } 328 } else { 329 sl = xmalloc(sizeof(*sl)+strlen(name)+1); 330 strcpy(sl->str, name); 331 sl->next = ifaces; 332 ifaces = sl; 333 334 display_ifconfig(sl->str, toys.optflags & FLAG_a, val); 335 } 336 } 337 fclose(fp); 338 339 if (iface_name) display_ifconfig(iface_name, 1, 0); 340 else { 341 struct ifconf ifcon; 342 struct ifreq *ifre; 343 int num; 344 345 // Loop until buffer's big enough 346 ifcon.ifc_buf = NULL; 347 for (num = 30;;num += 10) { 348 ifcon.ifc_len = sizeof(struct ifreq)*num; 349 ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len); 350 xioctl(TT.sockfd, SIOCGIFCONF, &ifcon); 351 if (ifcon.ifc_len != sizeof(struct ifreq)*num) break; 352 } 353 354 ifre = ifcon.ifc_req; 355 for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++) 356 { 357 // Skip duplicates 358 for(sl = ifaces; sl; sl = sl->next) 359 if(!strcmp(sl->str, ifre->ifr_name)) break; 360 361 if(!sl) display_ifconfig(ifre->ifr_name, toys.optflags & FLAG_a, 0); 362 } 363 364 free(ifcon.ifc_buf); 365 } 366 367 llist_traverse(ifaces, free); 368} 369 370// Encode offset and size of field into an int, and make result negative 371#define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x)) 372 373void ifconfig_main(void) 374{ 375 char **argv = toys.optargs; 376 struct ifreq ifre; 377 int i; 378 379 TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0); 380 if(toys.optc < 2) { 381 show_iface(*argv); 382 return; 383 } 384 385 // Open interface 386 memset(&ifre, 0, sizeof(struct ifreq)); 387 xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ); 388 389 // Perform operations on interface 390 while(*++argv) { 391 // Table of known operations 392 struct argh { 393 char *name; 394 int on, off; // set, clear 395 } try[] = { 396 {0, IFF_UP|IFF_RUNNING, SIOCSIFADDR}, 397 {"up", IFF_UP|IFF_RUNNING, 0}, 398 {"down", 0, IFF_UP}, 399 {"arp", 0, IFF_NOARP}, 400 {"promisc", IFF_PROMISC, 0}, 401 {"allmulti", IFF_ALLMULTI, 0}, 402 {"multicast", IFF_MULTICAST, 0}, 403 {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR}, 404 {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR}, 405 {"netmask", 0, SIOCSIFNETMASK}, 406 {"dstaddr", 0, SIOCSIFDSTADDR}, 407 {"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU}, 408 {"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE 409 {"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL 410 {"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC}, 411 {"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN}, 412 {"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP}, 413 {"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP}, 414 {"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP}, 415 {"inet", 0, 0}, 416 {"inet6", 0, 0} 417 }; 418 char *s = *argv; 419 int rev = (*s == '-'); 420 421 s += rev; 422 423 // "set hardware address" is oddball enough to special case 424 if (!strcmp(*argv, "hw")) { 425 char *hw_addr, *ptr, *p; 426 struct sockaddr *sock = &ifre.ifr_hwaddr; 427 int count = 6; 428 429 ptr = p = (char *)sock->sa_data; 430 memset(sock, 0, sizeof(struct sockaddr)); 431 if (argv[1]) { 432 if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER; 433 else if (!strcmp("infiniband", *argv)) { 434 sock->sa_family = ARPHRD_INFINIBAND; 435 count = 20; 436 p = ptr = toybuf; 437 } 438 } 439 if (!sock->sa_family || !argv[1]) help_exit("bad hw '%s'", *argv); 440 hw_addr = *++argv; 441 442 // Parse and verify address. 443 while (*hw_addr && (p-ptr) < count) { 444 int val, len = 0; 445 446 if (*hw_addr == ':') hw_addr++; 447 sscanf(hw_addr, "%2x%n", &val, &len); 448 if (!len || len > 2) break; // 1 nibble can be set e.g. C2:79:38:95:D:A 449 hw_addr += len; 450 *p++ = val; 451 } 452 453 if ((p-ptr) != count || *hw_addr) 454 error_exit("bad hw-addr '%s'", *argv); 455 456 // the linux kernel's "struct sockaddr" (include/linux/socket.h in the 457 // kernel source) only has 14 bytes of sa_data, and an infiniband address 458 // is 20. So if we go through the ioctl, the kernel will truncate 459 // infiniband addresses, meaning we have to go through sysfs instead. 460 if (sock->sa_family == ARPHRD_INFINIBAND && !strchr(ifre.ifr_name, '/')) { 461 int fd; 462 463 sprintf(toybuf, "/sys/class/net/%s/address", ifre.ifr_name); 464 fd = xopen(toybuf, O_RDWR); 465 xwrite(fd, *argv, strlen(*argv)); 466 close(fd); 467 } else xioctl(TT.sockfd, SIOCSIFHWADDR, &ifre); 468 continue; 469 470 // Add/remove ipv6 address to interface 471 472 } else if (!strcmp(*argv, "add") || !strcmp(*argv, "del")) { 473 struct ifreq_inet6 { 474 struct in6_addr addr; 475 unsigned prefix; 476 int index; 477 } ifre6; 478 int plen, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0); 479 480 if (!argv[1]) help_exit("%s", *argv); 481 482 plen = get_addrinfo(argv[1], AF_INET6, &ifre6.addr); 483 if (plen < 0) plen = 128; 484 xioctl(fd6, SIOCGIFINDEX, &ifre); 485 ifre6.index = ifre.ifr_ifindex; 486 ifre6.prefix = plen; 487 xioctl(fd6, **(argv++)=='a' ? SIOCSIFADDR : SIOCDIFADDR, &ifre6); 488 489 close(fd6); 490 continue; 491 // Iterate through table to find/perform operation 492 } else for (i = 0; i<ARRAY_LEN(try); i++) { 493 struct argh *t = try+i; 494 int on = t->on, off = t->off; 495 496 if (!t->name) { 497 if (isdigit(**argv) || !strcmp(*argv, "default")) argv--; 498 else continue; 499 } else if (strcmp(t->name, s)) continue; 500 501 // Is this an SIOCSI entry? 502 if ((off|0xff) == 0x89ff) { 503 if (!rev) { 504 if (!*++argv) error_exit("%s needs argument", t->name); 505 506 // Assign value to ifre field and call ioctl? (via IFREQ_OFFSZ.) 507 if (on < 0) { 508 long l = strtoul(*argv, 0, 0); 509 510 if (off == SIOCSIFMAP) xioctl(TT.sockfd, SIOCGIFMAP, &ifre); 511 on = -on; 512 poke((on>>16) + (char *)&ifre, l, on&15); 513 xioctl(TT.sockfd, off, &ifre); 514 break; 515 } else { 516 struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr; 517 int mask = -1; 518 519 si->sin_family = AF_INET; 520 521 if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY; 522 else mask = get_addrinfo(*argv, AF_INET, &si->sin_addr); 523 xioctl(TT.sockfd, off, &ifre); 524 525 // Handle /netmask 526 if (mask >= 0) { 527 // sin_addr probably isn't unaligned, but just in case... 528 mask = htonl((~0)<<(32-mask)); 529 memcpy(&si->sin_addr, &mask, 4); 530 xioctl(TT.sockfd, SIOCSIFNETMASK, &ifre); 531 } 532 } 533 } 534 off = 0; 535 } 536 537 // Set flags 538 if (on || off) { 539 xioctl(TT.sockfd, SIOCGIFFLAGS, &ifre); 540 ifre.ifr_flags &= ~(rev ? on : off); 541 ifre.ifr_flags |= (rev ? off : on); 542 xioctl(TT.sockfd, SIOCSIFFLAGS, &ifre); 543 } 544 545 break; 546 } 547 if (i == ARRAY_LEN(try)) help_exit("bad argument '%s'", *argv); 548 } 549 close(TT.sockfd); 550} 551