source: branches/stable/mindi-busybox/networking/route.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 13 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 17.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* route
3 *
4 * Similar to the standard Unix route, but with only the necessary
5 * parts for AF_INET and AF_INET6
6 *
7 * Bjorn Wesen, Axis Communications AB
8 *
9 * Author of the original route:
10 *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
11 *              (derived from FvK's 'route.c     1.70    01/04/94')
12 *
13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 *
15 *
16 * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
17 * adjustments by Larry Doolittle  <LRDoolittle@lbl.gov>
18 *
19 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
20 */
21
22/* 2004/03/09  Manuel Novoa III <mjn3@codepoet.org>
23 *
24 * Rewritten to fix several bugs, add additional error checking, and
25 * remove ridiculous amounts of bloat.
26 */
27
28#include <getopt.h>
29#include <net/route.h>
30#include <net/if.h>
31
32#include "libbb.h"
33#include "inet_common.h"
34
35
36#ifndef RTF_UP
37/* Keep this in sync with /usr/src/linux/include/linux/route.h */
38#define RTF_UP          0x0001  /* route usable                 */
39#define RTF_GATEWAY     0x0002  /* destination is a gateway     */
40#define RTF_HOST        0x0004  /* host entry (net otherwise)   */
41#define RTF_REINSTATE   0x0008  /* reinstate route after tmout  */
42#define RTF_DYNAMIC     0x0010  /* created dyn. (by redirect)   */
43#define RTF_MODIFIED    0x0020  /* modified dyn. (by redirect)  */
44#define RTF_MTU         0x0040  /* specific MTU for this route  */
45#ifndef RTF_MSS
46#define RTF_MSS         RTF_MTU /* Compatibility :-(            */
47#endif
48#define RTF_WINDOW      0x0080  /* per route window clamping    */
49#define RTF_IRTT        0x0100  /* Initial round trip time      */
50#define RTF_REJECT      0x0200  /* Reject route                 */
51#endif
52
53#if defined(SIOCADDRTOLD) || defined(RTF_IRTT)  /* route */
54#define HAVE_NEW_ADDRT 1
55#endif
56
57#if HAVE_NEW_ADDRT
58#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
59#define full_mask(x) (x)
60#else
61#define mask_in_addr(x) ((x).rt_genmask)
62#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
63#endif
64
65/* The RTACTION entries must agree with tbl_verb[] below! */
66#define RTACTION_ADD 1
67#define RTACTION_DEL 2
68
69/* For the various tbl_*[] arrays, the 1st byte is the offset to
70 * the next entry and the 2nd byte is return value. */
71
72#define NET_FLAG  1
73#define HOST_FLAG 2
74
75/* We remap '-' to '#' to avoid problems with getopt. */
76static const char tbl_hash_net_host[] ALIGN1 =
77    "\007\001#net\0"
78/*  "\010\002#host\0" */
79    "\007\002#host"             /* Since last, we can save a byte. */
80;
81
82#define KW_TAKES_ARG            020
83#define KW_SETS_FLAG            040
84
85#define KW_IPVx_METRIC          020
86#define KW_IPVx_NETMASK         021
87#define KW_IPVx_GATEWAY         022
88#define KW_IPVx_MSS             023
89#define KW_IPVx_WINDOW          024
90#define KW_IPVx_IRTT            025
91#define KW_IPVx_DEVICE          026
92
93#define KW_IPVx_FLAG_ONLY       040
94#define KW_IPVx_REJECT          040
95#define KW_IPVx_MOD             041
96#define KW_IPVx_DYN             042
97#define KW_IPVx_REINSTATE       043
98
99static const char tbl_ipvx[] ALIGN1 =
100    /* 020 is the "takes an arg" bit */
101#if HAVE_NEW_ADDRT
102    "\011\020metric\0"
103#endif
104    "\012\021netmask\0"
105    "\005\022gw\0"
106    "\012\022gateway\0"
107    "\006\023mss\0"
108    "\011\024window\0"
109#ifdef RTF_IRTT
110    "\007\025irtt\0"
111#endif
112    "\006\026dev\0"
113    "\011\026device\0"
114    /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
115#ifdef RTF_REJECT
116    "\011\040reject\0"
117#endif
118    "\006\041mod\0"
119    "\006\042dyn\0"
120/*  "\014\043reinstate\0" */
121    "\013\043reinstate"         /* Since last, we can save a byte. */
122;
123
124static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
125#ifdef RTF_REJECT
126    RTF_REJECT,
127#endif
128    RTF_MODIFIED,
129    RTF_DYNAMIC,
130    RTF_REINSTATE
131};
132
133static int kw_lookup(const char *kwtbl, char ***pargs)
134{
135    if (**pargs) {
136        do {
137            if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */
138                *pargs += 1;
139                if (kwtbl[1] & KW_TAKES_ARG) {
140                    if (!**pargs) { /* No more args! */
141                        bb_show_usage();
142                    }
143                    *pargs += 1; /* Calling routine will use args[-1]. */
144                }
145                return kwtbl[1];
146            }
147            kwtbl += *kwtbl;
148        } while (*kwtbl);
149    }
150    return 0;
151}
152
153/* Add or delete a route, depending on action. */
154
155static void INET_setroute(int action, char **args)
156{
157    struct rtentry rt;
158    const char *netmask = NULL;
159    int skfd, isnet, xflag;
160
161    /* Grab the -net or -host options.  Remember they were transformed. */
162    xflag = kw_lookup(tbl_hash_net_host, &args);
163
164    /* If we did grab -net or -host, make sure we still have an arg left. */
165    if (*args == NULL) {
166        bb_show_usage();
167    }
168
169    /* Clean out the RTREQ structure. */
170    memset(&rt, 0, sizeof(rt));
171
172    {
173        const char *target = *args++;
174        char *prefix;
175
176        /* recognize x.x.x.x/mask format. */
177        prefix = strchr(target, '/');
178        if (prefix) {
179            int prefix_len;
180
181            prefix_len = xatoul_range(prefix+1, 0, 32);
182            mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len));
183            *prefix = '\0';
184#if HAVE_NEW_ADDRT
185            rt.rt_genmask.sa_family = AF_INET;
186#endif
187        } else {
188            /* Default netmask. */
189            netmask = bb_str_default;
190        }
191        /* Prefer hostname lookup is -host flag (xflag==1) was given. */
192        isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
193                             (xflag & HOST_FLAG));
194        if (isnet < 0) {
195            bb_error_msg_and_die("resolving %s", target);
196        }
197        if (prefix) {
198            /* do not destroy prefix for process args */
199            *prefix = '/';
200        }
201    }
202
203    if (xflag) {        /* Reinit isnet if -net or -host was specified. */
204        isnet = (xflag & NET_FLAG);
205    }
206
207    /* Fill in the other fields. */
208    rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
209
210    while (*args) {
211        int k = kw_lookup(tbl_ipvx, &args);
212        const char *args_m1 = args[-1];
213
214        if (k & KW_IPVx_FLAG_ONLY) {
215            rt.rt_flags |= flags_ipvx[k & 3];
216            continue;
217        }
218
219#if HAVE_NEW_ADDRT
220        if (k == KW_IPVx_METRIC) {
221            rt.rt_metric = xatoul(args_m1) + 1;
222            continue;
223        }
224#endif
225
226        if (k == KW_IPVx_NETMASK) {
227            struct sockaddr mask;
228
229            if (mask_in_addr(rt)) {
230                bb_show_usage();
231            }
232
233            netmask = args_m1;
234            isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
235            if (isnet < 0) {
236                bb_error_msg_and_die("resolving %s", netmask);
237            }
238            rt.rt_genmask = full_mask(mask);
239            continue;
240        }
241
242        if (k == KW_IPVx_GATEWAY) {
243            if (rt.rt_flags & RTF_GATEWAY) {
244                bb_show_usage();
245            }
246
247            isnet = INET_resolve(args_m1,
248                                 (struct sockaddr_in *) &rt.rt_gateway, 1);
249            rt.rt_flags |= RTF_GATEWAY;
250
251            if (isnet) {
252                if (isnet < 0) {
253                    bb_error_msg_and_die("resolving %s", args_m1);
254                }
255                bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
256            }
257            continue;
258        }
259
260        if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
261            rt.rt_flags |= RTF_MSS;
262            rt.rt_mss = xatoul_range(args_m1, 64, 32768);
263            continue;
264        }
265
266        if (k == KW_IPVx_WINDOW) {  /* Check valid window bounds. */
267            rt.rt_flags |= RTF_WINDOW;
268            rt.rt_window = xatoul_range(args_m1, 128, INT_MAX);
269            continue;
270        }
271
272#ifdef RTF_IRTT
273        if (k == KW_IPVx_IRTT) {
274            rt.rt_flags |= RTF_IRTT;
275            rt.rt_irtt = xatoul(args_m1);
276            rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */
277#if 0                   /* FIXME: do we need to check anything of this? */
278            if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
279                bb_error_msg_and_die("bad irtt");
280            }
281#endif
282            continue;
283        }
284#endif
285
286        /* Device is special in that it can be the last arg specified
287         * and doesn't requre the dev/device keyword in that case. */
288        if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
289            /* Don't use args_m1 here since args may have changed! */
290            rt.rt_dev = args[-1];
291            continue;
292        }
293
294        /* Nothing matched. */
295        bb_show_usage();
296    }
297
298#ifdef RTF_REJECT
299    if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) {
300        rt.rt_dev = (char*)"lo";
301    }
302#endif
303
304    /* sanity checks.. */
305    if (mask_in_addr(rt)) {
306        unsigned long mask = mask_in_addr(rt);
307
308        mask = ~ntohl(mask);
309        if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
310            bb_error_msg_and_die("netmask %.8x and host route conflict",
311                                 (unsigned int) mask);
312        }
313        if (mask & (mask + 1)) {
314            bb_error_msg_and_die("bogus netmask %s", netmask);
315        }
316        mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
317        if (mask & ~mask_in_addr(rt)) {
318            bb_error_msg_and_die("netmask and route address conflict");
319        }
320    }
321
322    /* Fill out netmask if still unset */
323    if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) {
324        mask_in_addr(rt) = 0xffffffff;
325    }
326
327    /* Create a socket to the INET kernel. */
328    skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
329
330    if (action == RTACTION_ADD)
331        xioctl(skfd, SIOCADDRT, &rt);
332    else
333        xioctl(skfd, SIOCDELRT, &rt);
334
335    if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
336}
337
338#if ENABLE_FEATURE_IPV6
339
340static void INET6_setroute(int action, char **args)
341{
342    struct sockaddr_in6 sa6;
343    struct in6_rtmsg rt;
344    int prefix_len, skfd;
345    const char *devname;
346
347        /* We know args isn't NULL from the check in route_main. */
348        const char *target = *args++;
349
350        if (strcmp(target, bb_str_default) == 0) {
351            prefix_len = 0;
352            memset(&sa6, 0, sizeof(sa6));
353        } else {
354            char *cp;
355            if ((cp = strchr(target, '/'))) { /* Yes... const to non is ok. */
356                *cp = 0;
357                prefix_len = xatoul_range(cp+1, 0, 128);
358            } else {
359                prefix_len = 128;
360            }
361            if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
362                bb_error_msg_and_die("resolving %s", target);
363            }
364        }
365
366    /* Clean out the RTREQ structure. */
367    memset(&rt, 0, sizeof(rt));
368
369    memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
370
371    /* Fill in the other fields. */
372    rt.rtmsg_dst_len = prefix_len;
373    rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
374    rt.rtmsg_metric = 1;
375
376    devname = NULL;
377
378    while (*args) {
379        int k = kw_lookup(tbl_ipvx, &args);
380        const char *args_m1 = args[-1];
381
382        if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
383            rt.rtmsg_flags |= flags_ipvx[k & 3];
384            continue;
385        }
386
387        if (k == KW_IPVx_METRIC) {
388            rt.rtmsg_metric = xatoul(args_m1);
389            continue;
390        }
391
392        if (k == KW_IPVx_GATEWAY) {
393            if (rt.rtmsg_flags & RTF_GATEWAY) {
394                bb_show_usage();
395            }
396
397            if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
398                bb_error_msg_and_die("resolving %s", args_m1);
399            }
400            memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
401                   sizeof(struct in6_addr));
402            rt.rtmsg_flags |= RTF_GATEWAY;
403            continue;
404        }
405
406        /* Device is special in that it can be the last arg specified
407         * and doesn't requre the dev/device keyword in that case. */
408        if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
409            /* Don't use args_m1 here since args may have changed! */
410            devname = args[-1];
411            continue;
412        }
413
414        /* Nothing matched. */
415        bb_show_usage();
416    }
417
418    /* Create a socket to the INET6 kernel. */
419    skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
420
421    rt.rtmsg_ifindex = 0;
422
423    if (devname) {
424        struct ifreq ifr;
425        memset(&ifr, 0, sizeof(ifr));
426        strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name));
427        xioctl(skfd, SIOGIFINDEX, &ifr);
428        rt.rtmsg_ifindex = ifr.ifr_ifindex;
429    }
430
431    /* Tell the kernel to accept this route. */
432    if (action == RTACTION_ADD)
433        xioctl(skfd, SIOCADDRT, &rt);
434    else
435        xioctl(skfd, SIOCDELRT, &rt);
436
437    if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
438}
439#endif
440
441static const unsigned flagvals[] = { /* Must agree with flagchars[]. */
442    RTF_GATEWAY,
443    RTF_HOST,
444    RTF_REINSTATE,
445    RTF_DYNAMIC,
446    RTF_MODIFIED,
447#if ENABLE_FEATURE_IPV6
448    RTF_DEFAULT,
449    RTF_ADDRCONF,
450    RTF_CACHE
451#endif
452};
453
454#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
455#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
456
457/* Must agree with flagvals[]. */
458static const char flagchars[] ALIGN1 =
459    "GHRDM"
460#if ENABLE_FEATURE_IPV6
461    "DAC"
462#endif
463;
464
465static void set_flags(char *flagstr, int flags)
466{
467    int i;
468
469    *flagstr++ = 'U';
470
471    for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
472        if (flags & flagvals[i]) {
473            ++flagstr;
474        }
475    }
476}
477
478/* also used in netstat */
479void bb_displayroutes(int noresolve, int netstatfmt)
480{
481    char devname[64], flags[16], *sdest, *sgw;
482    unsigned long d, g, m;
483    int flgs, ref, use, metric, mtu, win, ir;
484    struct sockaddr_in s_addr;
485    struct in_addr mask;
486
487    FILE *fp = xfopen("/proc/net/route", "r");
488
489    printf("Kernel IP routing table\n"
490           "Destination     Gateway         Genmask         Flags %s Iface\n",
491            netstatfmt ? "  MSS Window  irtt" : "Metric Ref    Use");
492
493    if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
494        goto ERROR;        /* Empty or missing line, or read error. */
495    }
496    while (1) {
497        int r;
498        r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
499                   devname, &d, &g, &flgs, &ref, &use, &metric, &m,
500                   &mtu, &win, &ir);
501        if (r != 11) {
502            if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
503                break;
504            }
505 ERROR:
506            bb_error_msg_and_die("fscanf");
507        }
508
509        if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
510            continue;
511        }
512
513        set_flags(flags, (flgs & IPV4_MASK));
514#ifdef RTF_REJECT
515        if (flgs & RTF_REJECT) {
516            flags[0] = '!';
517        }
518#endif
519
520        memset(&s_addr, 0, sizeof(struct sockaddr_in));
521        s_addr.sin_family = AF_INET;
522        s_addr.sin_addr.s_addr = d;
523        sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
524        s_addr.sin_addr.s_addr = g;
525        sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
526        mask.s_addr = m;
527        /* "%15.15s" truncates hostnames, do we really want that? */
528        printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
529        free(sdest);
530        free(sgw);
531        if (netstatfmt) {
532            printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
533        } else {
534            printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
535        }
536    }
537}
538
539#if ENABLE_FEATURE_IPV6
540
541static void INET6_displayroutes(int noresolve)
542{
543    char addr6[128], *naddr6;
544    /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
545     * We read the non-delimited strings into the tail of the buffer
546     * using fscanf and then modify the buffer by shifting forward
547     * while inserting ':'s and the nul terminator for the first string.
548     * Hence the strings are at addr6x and addr6x+40.  This generates
549     * _much_ less code than the previous (upstream) approach. */
550    char addr6x[80];
551    char iface[16], flags[16];
552    int iflags, metric, refcnt, use, prefix_len, slen;
553    struct sockaddr_in6 snaddr6;
554
555    FILE *fp = xfopen("/proc/net/ipv6_route", "r");
556
557    printf("Kernel IPv6 routing table\n%-44s%-40s"
558              "Flags Metric Ref    Use Iface\n",
559              "Destination", "Next Hop");
560
561    while (1) {
562        int r;
563        r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
564                   addr6x+14, &prefix_len, &slen, addr6x+40+7,
565                   &metric, &use, &refcnt, &iflags, iface);
566        if (r != 9) {
567            if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
568                break;
569            }
570 ERROR:
571            bb_error_msg_and_die("fscanf");
572        }
573
574        /* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
575         * For now, always do this to validate the proc route format, even
576         * if the interface is down. */
577        {
578            int i = 0;
579            char *p = addr6x+14;
580
581            do {
582                if (!*p) {
583                    if (i == 40) { /* nul terminator for 1st address? */
584                        addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */
585                        ++p;    /* Skip and continue. */
586                        continue;
587                    }
588                    goto ERROR;
589                }
590                addr6x[i++] = *p++;
591                if (!((i+1) % 5)) {
592                    addr6x[i++] = ':';
593                }
594            } while (i < 40+28+7);
595        }
596
597        if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
598            continue;
599        }
600
601        set_flags(flags, (iflags & IPV6_MASK));
602
603        r = 0;
604        do {
605            inet_pton(AF_INET6, addr6x + r,
606                      (struct sockaddr *) &snaddr6.sin6_addr);
607            snaddr6.sin6_family = AF_INET6;
608            naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
609                           0x0fff /* Apparently, upstream never resolves. */
610                           );
611
612            if (!r) {           /* 1st pass */
613                snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
614                r += 40;
615                free(naddr6);
616            } else {            /* 2nd pass */
617                /* Print the info. */
618                printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
619                        addr6, naddr6, flags, metric, refcnt, use, iface);
620                free(naddr6);
621                break;
622            }
623        } while (1);
624    }
625}
626
627#endif
628
629#define ROUTE_OPT_A     0x01
630#define ROUTE_OPT_n     0x02
631#define ROUTE_OPT_e     0x04
632#define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */
633
634/* 1st byte is offset to next entry offset.  2nd byte is return value. */
635/* 2nd byte matches RTACTION_* code */
636static const char tbl_verb[] ALIGN1 =
637    "\006\001add\0"
638    "\006\002del\0"
639/*  "\011\002delete\0" */
640    "\010\002delete"  /* Since it's last, we can save a byte. */
641;
642
643int route_main(int argc, char **argv);
644int route_main(int argc, char **argv)
645{
646    unsigned opt;
647    int what;
648    char *family;
649    char **p;
650
651    /* First, remap '-net' and '-host' to avoid getopt problems. */
652    p = argv;
653    while (*++p) {
654        if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) {
655            p[0][0] = '#';
656        }
657    }
658
659    opt = getopt32(argv, "A:ne", &family);
660
661    if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) {
662#if ENABLE_FEATURE_IPV6
663        if (strcmp(family, "inet6") == 0) {
664            opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */
665        } else
666#endif
667        bb_show_usage();
668    }
669
670    argv += optind;
671
672    /* No more args means display the routing table. */
673    if (!*argv) {
674        int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0;
675#if ENABLE_FEATURE_IPV6
676        if (opt & ROUTE_OPT_INET6)
677            INET6_displayroutes(noresolve);
678        else
679#endif
680            bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
681
682        fflush_stdout_and_exit(EXIT_SUCCESS);
683    }
684
685    /* Check verb.  At the moment, must be add, del, or delete. */
686    what = kw_lookup(tbl_verb, &argv);
687    if (!what || !*argv) {      /* Unknown verb or no more args. */
688        bb_show_usage();
689    }
690
691#if ENABLE_FEATURE_IPV6
692    if (opt & ROUTE_OPT_INET6)
693        INET6_setroute(what, argv);
694    else
695#endif
696        INET_setroute(what, argv);
697
698    return EXIT_SUCCESS;
699}
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