source: branches/stable/mindi-busybox/networking/arp.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)

  • Property svn:eol-style set to native
File size: 11.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * arp.c - Manipulate the system ARP cache
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 *
10 * Author: Fred N. van Kempen, <waltje at uwalt.nl.mugnet.org>
11 * Busybox port: Paul van Gool <pvangool at mimotech.com>
12 *
13 * modified for getopt32 by Arne Bernin <arne [at] alamut.de>
14 */
15
16#include "libbb.h"
17#include "inet_common.h"
18
19#include <arpa/inet.h>
20#include <net/if.h>
21#include <net/if_arp.h>
22#include <netinet/ether.h>
23#include <netpacket/packet.h>
24
25#define DEBUG 0
26
27#define DFLT_AF "inet"
28#define DFLT_HW "ether"
29
30#define ARP_OPT_A (0x1)
31#define ARP_OPT_p (0x2)
32#define ARP_OPT_H (0x4)
33#define ARP_OPT_t (0x8)
34#define ARP_OPT_i (0x10)
35#define ARP_OPT_a (0x20)
36#define ARP_OPT_d (0x40)
37#define ARP_OPT_n (0x80)    /* do not resolve addresses     */
38#define ARP_OPT_D (0x100)   /* HW-address is devicename     */
39#define ARP_OPT_s (0x200)
40#define ARP_OPT_v (0x400 * DEBUG)   /* debugging output flag        */
41
42
43static const struct aftype *ap; /* current address family       */
44static const struct hwtype *hw; /* current hardware type        */
45static int sockfd;              /* active socket descriptor     */
46static smallint hw_set;         /* flag if hw-type was set (-H) */
47static const char *device = ""; /* current device               */
48
49static const char options[] ALIGN1 =
50    "pub\0"
51    "priv\0"
52    "temp\0"
53    "trail\0"
54    "dontpub\0"
55    "auto\0"
56    "dev\0"
57    "netmask\0";
58
59/* Delete an entry from the ARP cache. */
60/* Called only from main, once */
61static int arp_del(char **args)
62{
63    char *host;
64    struct arpreq req;
65    struct sockaddr sa;
66    int flags = 0;
67    int err;
68
69    memset(&req, 0, sizeof(req));
70
71    /* Resolve the host name. */
72    host = *args;
73    if (ap->input(host, &sa) < 0) {
74        bb_herror_msg_and_die("%s", host);
75    }
76
77    /* If a host has more than one address, use the correct one! */
78    memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
79
80    if (hw_set)
81        req.arp_ha.sa_family = hw->type;
82
83    req.arp_flags = ATF_PERM;
84    args++;
85    while (*args != NULL) {
86        switch (index_in_strings(options, *args)) {
87        case 0: /* "pub" */
88            flags |= 1;
89            args++;
90            break;
91        case 1: /* "priv" */
92            flags |= 2;
93            args++;
94            break;
95        case 2: /* "temp" */
96            req.arp_flags &= ~ATF_PERM;
97            args++;
98            break;
99        case 3: /* "trail" */
100            req.arp_flags |= ATF_USETRAILERS;
101            args++;
102            break;
103        case 4: /* "dontpub" */
104#ifdef HAVE_ATF_DONTPUB
105            req.arp_flags |= ATF_DONTPUB;
106#else
107            bb_error_msg("feature ATF_DONTPUB is not supported");
108#endif
109            args++;
110            break;
111        case 5: /* "auto" */
112#ifdef HAVE_ATF_MAGIC
113            req.arp_flags |= ATF_MAGIC;
114#else
115            bb_error_msg("feature ATF_MAGIC is not supported");
116#endif
117            args++;
118            break;
119        case 6: /* "dev" */
120            if (*++args == NULL)
121                bb_show_usage();
122            device = *args;
123            args++;
124            break;
125        case 7: /* "netmask" */
126            if (*++args == NULL)
127                bb_show_usage();
128            if (strcmp(*args, "255.255.255.255") != 0) {
129                host = *args;
130                if (ap->input(host, &sa) < 0) {
131                    bb_herror_msg_and_die("%s", host);
132                }
133                memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
134                req.arp_flags |= ATF_NETMASK;
135            }
136            args++;
137            break;
138        default:
139            bb_show_usage();
140            break;
141        }
142    }
143    if (flags == 0)
144        flags = 3;
145
146    strncpy(req.arp_dev, device, sizeof(req.arp_dev));
147
148    err = -1;
149
150    /* Call the kernel. */
151    if (flags & 2) {
152        if (option_mask32 & ARP_OPT_v)
153            bb_error_msg("SIOCDARP(nopub)");
154        err = ioctl(sockfd, SIOCDARP, &req);
155        if (err < 0) {
156            if (errno == ENXIO) {
157                if (flags & 1)
158                    goto nopub;
159                printf("No ARP entry for %s\n", host);
160                return -1;
161            }
162            bb_perror_msg_and_die("SIOCDARP(priv)");
163        }
164    }
165    if ((flags & 1) && err) {
166 nopub:
167        req.arp_flags |= ATF_PUBL;
168        if (option_mask32 & ARP_OPT_v)
169            bb_error_msg("SIOCDARP(pub)");
170        if (ioctl(sockfd, SIOCDARP, &req) < 0) {
171            if (errno == ENXIO) {
172                printf("No ARP entry for %s\n", host);
173                return -1;
174            }
175            bb_perror_msg_and_die("SIOCDARP(pub)");
176        }
177    }
178    return 0;
179}
180
181/* Get the hardware address to a specified interface name */
182static void arp_getdevhw(char *ifname, struct sockaddr *sa,
183                         const struct hwtype *hwt)
184{
185    struct ifreq ifr;
186    const struct hwtype *xhw;
187
188    strcpy(ifr.ifr_name, ifname);
189    ioctl_or_perror_and_die(sockfd, SIOCGIFHWADDR, &ifr,
190                    "cant get HW-Address for '%s'", ifname);
191    if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
192        bb_error_msg_and_die("protocol type mismatch");
193    }
194    memcpy(sa, &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
195
196    if (option_mask32 & ARP_OPT_v) {
197        xhw = get_hwntype(ifr.ifr_hwaddr.sa_family);
198        if (!xhw || !xhw->print) {
199            xhw = get_hwntype(-1);
200        }
201        bb_error_msg("device '%s' has HW address %s '%s'",
202                     ifname, xhw->name,
203                     xhw->print((char *) &ifr.ifr_hwaddr.sa_data));
204    }
205}
206
207/* Set an entry in the ARP cache. */
208/* Called only from main, once */
209static int arp_set(char **args)
210{
211    char *host;
212    struct arpreq req;
213    struct sockaddr sa;
214    int flags;
215
216    memset(&req, 0, sizeof(req));
217
218    host = *args++;
219    if (ap->input(host, &sa) < 0) {
220        bb_herror_msg_and_die("%s", host);
221    }
222    /* If a host has more than one address, use the correct one! */
223    memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
224
225    /* Fetch the hardware address. */
226    if (*args == NULL) {
227        bb_error_msg_and_die("need hardware address");
228    }
229    if (option_mask32 & ARP_OPT_D) {
230        arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL);
231    } else {
232        if (hw->input(*args++, &req.arp_ha) < 0) {
233            bb_error_msg_and_die("invalid hardware address");
234        }
235    }
236
237    /* Check out any modifiers. */
238    flags = ATF_PERM | ATF_COM;
239    while (*args != NULL) {
240        switch (index_in_strings(options, *args)) {
241        case 0: /* "pub" */
242            flags |= ATF_PUBL;
243            args++;
244            break;
245        case 1: /* "priv" */
246            flags &= ~ATF_PUBL;
247            args++;
248            break;
249        case 2: /* "temp" */
250            flags &= ~ATF_PERM;
251            args++;
252            break;
253        case 3: /* "trail" */
254            flags |= ATF_USETRAILERS;
255            args++;
256            break;
257        case 4: /* "dontpub" */
258#ifdef HAVE_ATF_DONTPUB
259            flags |= ATF_DONTPUB;
260#else
261            bb_error_msg("feature ATF_DONTPUB is not supported");
262#endif
263            args++;
264            break;
265        case 5: /* "auto" */
266#ifdef HAVE_ATF_MAGIC
267            flags |= ATF_MAGIC;
268#else
269            bb_error_msg("feature ATF_MAGIC is not supported");
270#endif
271            args++;
272            break;
273        case 6: /* "dev" */
274            if (*++args == NULL)
275                bb_show_usage();
276            device = *args;
277            args++;
278            break;
279        case 7: /* "netmask" */
280            if (*++args == NULL)
281                bb_show_usage();
282            if (strcmp(*args, "255.255.255.255") != 0) {
283                host = *args;
284                if (ap->input(host, &sa) < 0) {
285                    bb_herror_msg_and_die("%s", host);
286                }
287                memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
288                flags |= ATF_NETMASK;
289            }
290            args++;
291            break;
292        default:
293            bb_show_usage();
294            break;
295        }
296    }
297
298    /* Fill in the remainder of the request. */
299    req.arp_flags = flags;
300
301    strncpy(req.arp_dev, device, sizeof(req.arp_dev));
302
303    /* Call the kernel. */
304    if (option_mask32 & ARP_OPT_v)
305        bb_error_msg("SIOCSARP()");
306    xioctl(sockfd, SIOCSARP, &req);
307    return 0;
308}
309
310
311/* Print the contents of an ARP request block. */
312static void
313arp_disp(const char *name, char *ip, int type, int arp_flags,
314         char *hwa, char *mask, char *dev)
315{
316    const struct hwtype *xhw;
317
318    xhw = get_hwntype(type);
319    if (xhw == NULL)
320        xhw = get_hwtype(DFLT_HW);
321
322    printf("%s (%s) at ", name, ip);
323
324    if (!(arp_flags & ATF_COM)) {
325        if (arp_flags & ATF_PUBL)
326            printf("* ");
327        else
328            printf("<incomplete> ");
329    } else {
330        printf("%s [%s] ", hwa, xhw->name);
331    }
332
333    if (arp_flags & ATF_NETMASK)
334        printf("netmask %s ", mask);
335
336    if (arp_flags & ATF_PERM)
337        printf("PERM ");
338    if (arp_flags & ATF_PUBL)
339        printf("PUP ");
340#ifdef HAVE_ATF_MAGIC
341    if (arp_flags & ATF_MAGIC)
342        printf("AUTO ");
343#endif
344#ifdef HAVE_ATF_DONTPUB
345    if (arp_flags & ATF_DONTPUB)
346        printf("DONTPUB ");
347#endif
348    if (arp_flags & ATF_USETRAILERS)
349        printf("TRAIL ");
350
351    printf("on %s\n", dev);
352}
353
354/* Display the contents of the ARP cache in the kernel. */
355/* Called only from main, once */
356static int arp_show(char *name)
357{
358    const char *host;
359    const char *hostname;
360    FILE *fp;
361    struct sockaddr sa;
362    int type, flags;
363    int num;
364    unsigned entries = 0, shown = 0;
365    char ip[128];
366    char hwa[128];
367    char mask[128];
368    char line[128];
369    char dev[128];
370
371    host = NULL;
372    if (name != NULL) {
373        /* Resolve the host name. */
374        if (ap->input(name, &sa) < 0) {
375            bb_herror_msg_and_die("%s", name);
376        }
377        host = xstrdup(ap->sprint(&sa, 1));
378    }
379    fp = xfopen("/proc/net/arp", "r");
380    /* Bypass header -- read one line */
381    fgets(line, sizeof(line), fp);
382
383    /* Read the ARP cache entries. */
384    while (fgets(line, sizeof(line), fp)) {
385
386        mask[0] = '-'; mask[1] = '\0';
387        dev[0] = '-'; dev[1] = '\0';
388        /* All these strings can't overflow
389         * because fgets above reads limited amount of data */
390        num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
391                     ip, &type, &flags, hwa, mask, dev);
392        if (num < 4)
393            break;
394
395        entries++;
396        /* if the user specified hw-type differs, skip it */
397        if (hw_set && (type != hw->type))
398            continue;
399
400        /* if the user specified address differs, skip it */
401        if (host && strcmp(ip, host) != 0)
402            continue;
403
404        /* if the user specified device differs, skip it */
405        if (device[0] && strcmp(dev, device) != 0)
406            continue;
407
408        shown++;
409        /* This IS ugly but it works -be */
410        hostname = "?";
411        if (!(option_mask32 & ARP_OPT_n)) {
412            if (ap->input(ip, &sa) < 0)
413                hostname = ip;
414            else
415                hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
416            if (strcmp(hostname, ip) == 0)
417                hostname = "?";
418        }
419
420        arp_disp(hostname, ip, type, flags, hwa, mask, dev);
421    }
422    if (option_mask32 & ARP_OPT_v)
423        printf("Entries: %d\tSkipped: %d\tFound: %d\n",
424               entries, entries - shown, shown);
425
426    if (!shown) {
427        if (hw_set || host || device[0])
428            printf("No match found in %d entries\n", entries);
429    }
430    if (ENABLE_FEATURE_CLEAN_UP) {
431        free((char*)host);
432        fclose(fp);
433    }
434    return 0;
435}
436
437int arp_main(int argc, char **argv);
438int arp_main(int argc, char **argv)
439{
440    char *hw_type;
441    char *protocol;
442
443    /* Initialize variables... */
444    ap = get_aftype(DFLT_AF);
445    if (!ap)
446        bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
447
448    getopt32(argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
449                 &hw_type, &hw_type, &device);
450    argv += optind;
451    if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
452        ap = get_aftype(protocol);
453        if (ap == NULL)
454            bb_error_msg_and_die("%s: unknown %s", protocol, "address family");
455    }
456    if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
457        hw = get_hwtype(hw_type);
458        if (hw == NULL)
459            bb_error_msg_and_die("%s: unknown %s", hw_type, "hardware type");
460        hw_set = 1;
461    }
462    //if (option_mask32 & ARP_OPT_i)... -i
463
464    if (ap->af != AF_INET) {
465        bb_error_msg_and_die("%s: kernel only supports 'inet'", ap->name);
466    }
467
468    /* If no hw type specified get default */
469    if (!hw) {
470        hw = get_hwtype(DFLT_HW);
471        if (!hw)
472            bb_error_msg_and_die("%s: %s not supported", DFLT_HW, "hardware type");
473    }
474
475    if (hw->alen <= 0) {
476        bb_error_msg_and_die("%s: %s without ARP support",
477                             hw->name, "hardware type");
478    }
479    sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
480
481    /* Now see what we have to do here... */
482    if (option_mask32 & (ARP_OPT_d|ARP_OPT_s)) {
483        if (argv[0] == NULL)
484            bb_error_msg_and_die("need host name");
485        if (option_mask32 & ARP_OPT_s)
486            return arp_set(argv);
487        return arp_del(argv);
488    }
489    //if (option_mask32 & ARP_OPT_a) - default
490    return arp_show(argv[0]);
491}
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