1 /* ifconfig.c - Configure network interface.
2 *
3 * Copyright 2012 Ranjan Kumar <[email protected]>
4 * Copyright 2012 Kyungwan Han <[email protected]>
5 * Reviewed by Kyungsu Kim <[email protected]>
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
14 USE_IFCONFIG(NEWTOY(ifconfig, "^?aS", TOYFLAG_SBIN))
15
16 config 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 rename NEWNAME - rename interface
46
47 Flags you can set on an interface (or -remove by prefixing with -):
48
49 arp - don't use Address Resolution Protocol to map LAN routes
50 promisc - don't discard packets that aren't to this LAN hardware address
51 multicast - force interface into multicast mode if the driver doesn't
52 allmulti - promisc for multicast packets
53 */
54
55 #define FOR_ifconfig
56 #include "toys.h"
57
58 #include <net/if_arp.h>
59 #include <net/ethernet.h>
60
GLOBALS(int sockfd;)61 GLOBALS(
62 int sockfd;
63 )
64
65 // Convert hostname to binary address for AF_INET or AF_INET6
66 // return /prefix (or range max if none)
67 static int get_addrinfo(char *host, sa_family_t af, void *addr)
68 {
69 struct addrinfo hints, *result, *rp = 0;
70 int status, len;
71 char *from, *slash;
72
73 memset(&hints, 0 , sizeof(struct addrinfo));
74 hints.ai_family = af;
75 hints.ai_socktype = SOCK_STREAM;
76
77 slash = strchr(host, '/');
78 if (slash) *slash = 0;
79
80 status = getaddrinfo(host, NULL, &hints, &result);
81 if (!status)
82 for (rp = result; rp; rp = rp->ai_next)
83 if (rp->ai_family == af) break;
84 if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status));
85
86 // ai_addr isn't struct in_addr or in6_addr, it's struct sockaddr. Of course.
87 // You'd think ipv4 and ipv6 would have some basic compatibility, but no.
88 from = ((char *)rp->ai_addr) + 4;
89 if (af == AF_INET6) {
90 len = 16;
91 from += 4; // skip "flowinfo" field ipv6 puts before address
92 } else len = 4;
93 memcpy(addr, from, len);
94 freeaddrinfo(result);
95
96 len = -1;
97 if (slash) len = atolx_range(slash+1, 0, (af == AF_INET) ? 32 : 128);
98
99 return len;
100 }
101
display_ifconfig(char * name,int always,unsigned long long val[])102 static void display_ifconfig(char *name, int always, unsigned long long val[])
103 {
104 struct ifreq ifre;
105 struct sockaddr_in *si = (void *)&ifre.ifr_addr;
106 struct {
107 int type;
108 char *title;
109 } types[] = {
110 {ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"},
111 {ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"},
112 {ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"}
113 };
114 int i;
115 char *pp;
116 FILE *fp;
117 short flags;
118
119 xstrncpy(ifre.ifr_name, name, IFNAMSIZ);
120 if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit_raw(name);
121 flags = ifre.ifr_flags;
122 if (!always && !(flags & IFF_UP)) return;
123
124 if (FLAG(S)) {
125 unsigned uu = 0;
126 int len;
127
128 ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
129 len = printf("%*s %s", -9, name, inet_ntoa(si->sin_addr));
130 if (!ioctl(TT.sockfd, SIOCGIFNETMASK, &ifre))
131 uu = htonl(*(unsigned *)&(si->sin_addr));
132 for (i = 0; uu; i++) uu <<= 1;
133 len += printf("/%d", i);
134 printf("%*c", 29-len, ' ');
135 }
136
137 // Query hardware type and hardware address.
138 // Not xioctl because you don't have permission for this on Android.
139 ioctl(TT.sockfd, SIOCGIFHWADDR, &ifre);
140
141 if (FLAG(S))
142 for (i=0; i<6; i++) printf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]);
143 else {
144 for (i=0; i < ARRAY_LEN(types)-1; i++)
145 if (ifre.ifr_hwaddr.sa_family == types[i].type) break;
146 xprintf("%-9s Link encap:%s ", name, types[i].title);
147 if(ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) {
148 xprintf("HWaddr ");
149 for (i=0; i<6; i++) xprintf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]);
150 }
151 sprintf(toybuf, "/sys/class/net/%.15s/device/driver", name);
152 if (readlink0(toybuf, toybuf, sizeof(toybuf))>0)
153 if ((pp = strrchr(toybuf, '/'))) xprintf(" Driver %s", pp+1);
154 xputc('\n');
155 }
156
157 // If an address is assigned record that.
158
159 ifre.ifr_addr.sa_family = AF_INET;
160 memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr));
161 ioctl(TT.sockfd, SIOCGIFADDR, &ifre);
162 pp = (char *)&ifre.ifr_addr;
163 for (i = 0; i<sizeof(ifre.ifr_addr); i++) if (pp[i]) break;
164
165 if (!FLAG(S) && i != sizeof(ifre.ifr_addr)) {
166 struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
167 struct {
168 char *name;
169 int flag, ioctl;
170 } addr[] = {
171 {"addr", 0, 0},
172 {"P-t-P", IFF_POINTOPOINT, SIOCGIFDSTADDR},
173 {"Bcast", IFF_BROADCAST, SIOCGIFBRDADDR},
174 {"Mask", 0, SIOCGIFNETMASK}
175 };
176
177 // TODO: can this be ipv6? Why are we checking here when ipv6 source later?
178 xprintf("%10c%s", ' ', (si->sin_family == AF_INET) ? "inet" :
179 (si->sin_family == AF_INET6) ? "inet6" : "unspec");
180
181 for (i=0; i<ARRAY_LEN(addr); i++) {
182 if (!addr[i].flag || (flags & addr[i].flag)) {
183 if (addr[i].ioctl && ioctl(TT.sockfd, addr[i].ioctl, &ifre))
184 si->sin_family = 0;
185 xprintf(" %s:%s ", addr[i].name,
186 (si->sin_family == 0xFFFF || !si->sin_family)
187 ? "[NOT SET]" : inet_ntoa(si->sin_addr));
188 }
189 }
190
191 xputc('\n');
192 }
193
194 fp = fopen(pp = "/proc/net/if_inet6", "r");
195 if (fp) {
196 char iface_name[IFNAMSIZ];
197 int plen, iscope;
198
199 while (fgets(toybuf, sizeof(toybuf), fp)) {
200 int nitems;
201 char ipv6_addr[40];
202
203 nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n",
204 ipv6_addr, &plen, &iscope, iface_name);
205 if (nitems<0 && feof(fp)) break;
206 if (nitems != 4) perror_exit("bad %s", pp);
207
208 if (!strcmp(name, iface_name)) {
209 struct sockaddr_in6 s6;
210 char *ptr = ipv6_addr+sizeof(ipv6_addr)-1;
211
212 // convert giant hex string into colon-spearated ipv6 address by
213 // inserting ':' every 4 characters.
214 for (i = 32; i; i--)
215 if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':';
216
217 // Convert to binary and back to get abbreviated :: version
218 if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) {
219 if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) {
220 char *scopes[] = {"Global","Host","Link","Site","Compat"},
221 *scope = "Unknown";
222
223 for (i=0; i<ARRAY_LEN(scopes); i++)
224 if (iscope == (!!i)<<(i+3)) scope = scopes[i];
225 if (FLAG(S)) xprintf(" %s/%d@%c", toybuf, plen,*scope);
226 else xprintf("%10cinet6 addr: %s/%d Scope: %s\n",
227 ' ', toybuf, plen, scope);
228 }
229 }
230 }
231 }
232 fclose(fp);
233 }
234
235 if (FLAG(S)) {
236 xputc('\n');
237 return;
238 }
239
240 xprintf("%10c", ' ');
241
242 if (flags) {
243 unsigned short mask = 1;
244 char **s, *str[] = {
245 "UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS",
246 "RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST",
247 "PORTSEL", "AUTOMEDIA", "DYNAMIC", "LOWER_UP", "DORMANT", "ECHO", NULL
248 };
249
250 for (s = str; *s; s++) {
251 if (flags & mask) xprintf("%s ", *s);
252 mask <<= 1;
253 }
254 } else xprintf("[NO FLAGS] ");
255
256 if (ioctl(TT.sockfd, SIOCGIFMTU, &ifre) < 0) ifre.ifr_mtu = 0;
257 xprintf(" MTU:%d", ifre.ifr_mtu);
258 if (ioctl(TT.sockfd, SIOCGIFMETRIC, &ifre) < 0) ifre.ifr_metric = 0;
259 if (!ifre.ifr_metric) ifre.ifr_metric = 1;
260 xprintf(" Metric:%d", ifre.ifr_metric);
261
262 // non-virtual interface
263
264 if (val) {
265 char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns",
266 "frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns",
267 "collisions", "carrier", 0, "txqueuelen"};
268 signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1,
269 13, 16, -1, 0, 8};
270 int i;
271
272 // Query txqueuelen
273 if (ioctl(TT.sockfd, SIOCGIFTXQLEN, &ifre) >= 0) val[16] = ifre.ifr_qlen;
274 else val[16] = -1;
275
276 for (i = 0; i<sizeof(order); i++) {
277 int j = order[i];
278
279 if (j < 0) xprintf("\n%10c", ' ');
280 else xprintf("%s:%llu ", label[j], val[j]);
281 }
282 }
283 xputc('\n');
284
285 if(!ioctl(TT.sockfd, SIOCGIFMAP, &ifre) && (ifre.ifr_map.irq ||
286 ifre.ifr_map.mem_start || ifre.ifr_map.dma || ifre.ifr_map.base_addr))
287 {
288 xprintf("%10c", ' ');
289 if(ifre.ifr_map.irq) xprintf("Interrupt:%d ", ifre.ifr_map.irq);
290 if(ifre.ifr_map.base_addr >= 0x100) // IO_MAP_INDEX
291 xprintf("Base address:0x%x ", ifre.ifr_map.base_addr);
292 if(ifre.ifr_map.mem_start)
293 xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end);
294 if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma);
295 xputc('\n');
296 }
297 xputc('\n');
298 }
299
show_iface(char * iface_name)300 static void show_iface(char *iface_name)
301 {
302 char *name;
303 struct string_list *ifaces = 0, *sl;
304 int i, j;
305 FILE *fp;
306
307 fp = xfopen("/proc/net/dev", "r");
308
309 for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) {
310 char *buf = toybuf;
311 unsigned long long val[17];
312
313 if (i<2) continue;
314
315 while (isspace(*buf)) buf++;
316 name = strsep(&buf, ":");
317 if(!buf) error_exit("bad name %s", name);
318
319 errno = 0;
320 for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0);
321 if (errno) perror_exit("bad %s at %s", name, buf);
322
323 if (iface_name) {
324 if (!strcmp(iface_name, name)) {
325 display_ifconfig(iface_name, 1, val);
326
327 return;
328 }
329 } else {
330 sl = xmalloc(sizeof(*sl)+strlen(name)+1);
331 strcpy(sl->str, name);
332 sl->next = ifaces;
333 ifaces = sl;
334
335 display_ifconfig(sl->str, FLAG(a), val);
336 }
337 }
338 fclose(fp);
339
340 if (iface_name) display_ifconfig(iface_name, 1, 0);
341 else {
342 struct ifconf ifcon;
343 struct ifreq *ifre;
344 int num;
345
346 // Loop until buffer's big enough
347 ifcon.ifc_buf = NULL;
348 for (num = 30;;num += 10) {
349 ifcon.ifc_len = sizeof(struct ifreq)*num;
350 ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len);
351 xioctl(TT.sockfd, SIOCGIFCONF, &ifcon);
352 if (ifcon.ifc_len != sizeof(struct ifreq)*num) break;
353 }
354
355 ifre = ifcon.ifc_req;
356 for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++)
357 {
358 // Skip duplicates
359 for(sl = ifaces; sl; sl = sl->next)
360 if(!strcmp(sl->str, ifre->ifr_name)) break;
361
362 if(!sl) display_ifconfig(ifre->ifr_name, FLAG(a), 0);
363 }
364
365 free(ifcon.ifc_buf);
366 }
367
368 llist_traverse(ifaces, free);
369 }
370
371 // Encode offset and size of field into an int, and make result negative
372 #define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x))
373
ifconfig_main(void)374 void ifconfig_main(void)
375 {
376 char **argv = toys.optargs;
377 struct ifreq ifre;
378 int i;
379
380 TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
381 if(toys.optc < 2) {
382 show_iface(*argv);
383 return;
384 }
385
386 // Open interface
387 memset(&ifre, 0, sizeof(struct ifreq));
388 xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ);
389
390 // Perform operations on interface
391 while(*++argv) {
392 // Table of known operations
393 struct argh {
394 char *name;
395 int on, off; // set, clear
396 } try[] = {
397 {0, IFF_UP|IFF_RUNNING, SIOCSIFADDR},
398 {"up", IFF_UP|IFF_RUNNING, 0},
399 {"down", 0, IFF_UP},
400 {"arp", 0, IFF_NOARP},
401 {"promisc", IFF_PROMISC, 0},
402 {"allmulti", IFF_ALLMULTI, 0},
403 {"multicast", IFF_MULTICAST, 0},
404 {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR},
405 {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR},
406 {"netmask", 0, SIOCSIFNETMASK},
407 {"dstaddr", 0, SIOCSIFDSTADDR},
408 {"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU},
409 {"rename", IFREQ_OFFSZ(ifr_newname), SIOCSIFNAME},
410 {"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE
411 {"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL
412 {"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC},
413 {"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN},
414 {"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP},
415 {"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP},
416 {"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP},
417 {"inet", 0, 0},
418 {"inet6", 0, 0}
419 };
420 char *s = *argv;
421 int rev = (*s == '-');
422
423 s += rev;
424
425 // "set hardware address" is oddball enough to special case
426 if (!strcmp(*argv, "hw")) {
427 char *hw_addr, *ptr, *p;
428 struct sockaddr *sock = &ifre.ifr_hwaddr;
429 int count = 6;
430
431 ptr = p = (char *)sock->sa_data;
432 memset(sock, 0, sizeof(struct sockaddr));
433 if (argv[1]) {
434 if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER;
435 else if (!strcmp("infiniband", *argv)) {
436 sock->sa_family = ARPHRD_INFINIBAND;
437 count = 20;
438 p = ptr = toybuf;
439 }
440 }
441 if (!sock->sa_family || !argv[1]) help_exit("bad hw '%s'", *argv);
442 hw_addr = *++argv;
443
444 // Parse and verify address.
445 while (*hw_addr && (p-ptr) < count) {
446 int val, len = 0;
447
448 if (*hw_addr == ':') hw_addr++;
449 sscanf(hw_addr, "%2x%n", &val, &len);
450 if (!len || len > 2) break; // 1 nibble can be set e.g. C2:79:38:95:D:A
451 hw_addr += len;
452 *p++ = val;
453 }
454
455 if ((p-ptr) != count || *hw_addr)
456 error_exit("bad hw-addr '%s'", *argv);
457
458 // the linux kernel's "struct sockaddr" (include/linux/socket.h in the
459 // kernel source) only has 14 bytes of sa_data, and an infiniband address
460 // is 20. So if we go through the ioctl, the kernel will truncate
461 // infiniband addresses, meaning we have to go through sysfs instead.
462 if (sock->sa_family == ARPHRD_INFINIBAND && !strchr(ifre.ifr_name, '/')) {
463 int fd;
464
465 sprintf(toybuf, "/sys/class/net/%s/address", ifre.ifr_name);
466 fd = xopen(toybuf, O_RDWR);
467 xwrite(fd, *argv, strlen(*argv));
468 close(fd);
469 } else xioctl(TT.sockfd, SIOCSIFHWADDR, &ifre);
470 continue;
471
472 // Add/remove ipv6 address to interface
473
474 } else if (!strcmp(*argv, "add") || !strcmp(*argv, "del")) {
475 struct ifreq_inet6 {
476 struct in6_addr addr;
477 unsigned prefix;
478 int index;
479 } ifre6;
480 int plen, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
481
482 if (!argv[1]) help_exit("%s", *argv);
483
484 plen = get_addrinfo(argv[1], AF_INET6, &ifre6.addr);
485 if (plen < 0) plen = 128;
486 xioctl(fd6, SIOCGIFINDEX, &ifre);
487 ifre6.index = ifre.ifr_ifindex;
488 ifre6.prefix = plen;
489 xioctl(fd6, **(argv++)=='a' ? SIOCSIFADDR : SIOCDIFADDR, &ifre6);
490
491 close(fd6);
492 continue;
493 // Iterate through table to find/perform operation
494 } else for (i = 0; i<ARRAY_LEN(try); i++) {
495 struct argh *t = try+i;
496 int on = t->on, off = t->off;
497
498 // First entry in list assigns address to interface (no command name)
499 if (!t->name) {
500 if (isdigit(**argv) || !strcmp(*argv, "default")) argv--;
501 else continue;
502 } else if (strcmp(t->name, s)) continue;
503
504 // Is this an SIOCSI entry?
505 if ((off|0xff) == 0x89ff) {
506 if (!rev) {
507 if (!*++argv) error_exit("%s needs argument", t->name);
508
509 // Assign value to ifre field and call ioctl? (via IFREQ_OFFSZ.)
510 if (on < 0) {
511 void *dest = ((on = -on)>>16)+(char *)&ifre;
512
513 // If we're about to set mem_start/io_addr/irq, get other 2 first
514 if (off == SIOCSIFMAP) xioctl(TT.sockfd, SIOCGIFMAP, &ifre);
515 if (off == SIOCSIFNAME) xstrncpy(dest, *argv, on&0xffff);
516 else poke(dest, strtoul(*argv, 0, 0), on&15);
517 xioctl(TT.sockfd, off, &ifre);
518 break;
519 } else {
520 struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr;
521 int mask = -1;
522
523 si->sin_family = AF_INET;
524
525 if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY;
526 else mask = get_addrinfo(*argv, AF_INET, &si->sin_addr);
527 xioctl(TT.sockfd, off, &ifre);
528
529 // Handle /netmask
530 if (mask >= 0) {
531 // sin_addr probably isn't unaligned, but just in case...
532 mask = htonl((~0)<<(32-mask));
533 memcpy(&si->sin_addr, &mask, 4);
534 xioctl(TT.sockfd, SIOCSIFNETMASK, &ifre);
535 }
536 }
537 }
538 off = 0;
539 }
540
541 // Set flags
542 if (on || off) {
543 xioctl(TT.sockfd, SIOCGIFFLAGS, &ifre);
544 ifre.ifr_flags &= ~(rev ? on : off);
545 ifre.ifr_flags |= (rev ? off : on);
546 xioctl(TT.sockfd, SIOCSIFFLAGS, &ifre);
547 }
548
549 break;
550 }
551 if (i == ARRAY_LEN(try)) help_exit("bad argument '%s'", *argv);
552 }
553 close(TT.sockfd);
554 }
555