source: branches/stable/mindi-busybox/networking/libiproute/libnetlink.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: 8.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * libnetlink.c RTnetlink service routines.
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 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 *
12 */
13
14#include <sys/socket.h>
15#include <sys/uio.h>
16
17#include "libbb.h"
18#include "libnetlink.h"
19
20void rtnl_close(struct rtnl_handle *rth)
21{
22    close(rth->fd);
23}
24
25int xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/)
26{
27    socklen_t addr_len;
28
29    memset(rth, 0, sizeof(rth));
30
31    rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
32
33    memset(&rth->local, 0, sizeof(rth->local));
34    rth->local.nl_family = AF_NETLINK;
35    /*rth->local.nl_groups = subscriptions;*/
36
37    xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
38    addr_len = sizeof(rth->local);
39    if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
40        bb_perror_msg_and_die("cannot getsockname");
41    if (addr_len != sizeof(rth->local))
42        bb_error_msg_and_die("wrong address length %d", addr_len);
43    if (rth->local.nl_family != AF_NETLINK)
44        bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
45    rth->seq = time(NULL);
46    return 0;
47}
48
49int xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
50{
51    struct {
52        struct nlmsghdr nlh;
53        struct rtgenmsg g;
54    } req;
55    struct sockaddr_nl nladdr;
56
57    memset(&nladdr, 0, sizeof(nladdr));
58    nladdr.nl_family = AF_NETLINK;
59
60    req.nlh.nlmsg_len = sizeof(req);
61    req.nlh.nlmsg_type = type;
62    req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
63    req.nlh.nlmsg_pid = 0;
64    req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
65    req.g.rtgen_family = family;
66
67    return xsendto(rth->fd, (void*)&req, sizeof(req),
68                 (struct sockaddr*)&nladdr, sizeof(nladdr));
69}
70
71int rtnl_send(struct rtnl_handle *rth, char *buf, int len)
72{
73    struct sockaddr_nl nladdr;
74
75    memset(&nladdr, 0, sizeof(nladdr));
76    nladdr.nl_family = AF_NETLINK;
77
78    return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
79}
80
81int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
82{
83    struct nlmsghdr nlh;
84    struct sockaddr_nl nladdr;
85    struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } };
86    struct msghdr msg = {
87        (void*)&nladdr, sizeof(nladdr),
88        iov,    2,
89        NULL,   0,
90        0
91    };
92
93    memset(&nladdr, 0, sizeof(nladdr));
94    nladdr.nl_family = AF_NETLINK;
95
96    nlh.nlmsg_len = NLMSG_LENGTH(len);
97    nlh.nlmsg_type = type;
98    nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
99    nlh.nlmsg_pid = 0;
100    nlh.nlmsg_seq = rth->dump = ++rth->seq;
101
102    return sendmsg(rth->fd, &msg, 0);
103}
104
105static int rtnl_dump_filter(struct rtnl_handle *rth,
106        int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
107        void *arg1/*,
108        int (*junk)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
109        void *arg2*/)
110{
111    char buf[8192];
112    struct sockaddr_nl nladdr;
113    struct iovec iov = { buf, sizeof(buf) };
114
115    while (1) {
116        int status;
117        struct nlmsghdr *h;
118
119        struct msghdr msg = {
120            (void*)&nladdr, sizeof(nladdr),
121            &iov,   1,
122            NULL,   0,
123            0
124        };
125
126        status = recvmsg(rth->fd, &msg, 0);
127
128        if (status < 0) {
129            if (errno == EINTR)
130                continue;
131            bb_perror_msg("OVERRUN");
132            continue;
133        }
134        if (status == 0) {
135            bb_error_msg("EOF on netlink");
136            return -1;
137        }
138        if (msg.msg_namelen != sizeof(nladdr)) {
139            bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
140        }
141
142        h = (struct nlmsghdr*)buf;
143        while (NLMSG_OK(h, status)) {
144            int err;
145
146            if (nladdr.nl_pid != 0 ||
147                h->nlmsg_pid != rth->local.nl_pid ||
148                h->nlmsg_seq != rth->dump) {
149/*              if (junk) {
150                    err = junk(&nladdr, h, arg2);
151                    if (err < 0)
152                        return err;
153                } */
154                goto skip_it;
155            }
156
157            if (h->nlmsg_type == NLMSG_DONE) {
158                return 0;
159            }
160            if (h->nlmsg_type == NLMSG_ERROR) {
161                struct nlmsgerr *l_err = (struct nlmsgerr*)NLMSG_DATA(h);
162                if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
163                    bb_error_msg("ERROR truncated");
164                } else {
165                    errno = -l_err->error;
166                    bb_perror_msg("RTNETLINK answers");
167                }
168                return -1;
169            }
170            err = filter(&nladdr, h, arg1);
171            if (err < 0)
172                return err;
173
174skip_it:
175            h = NLMSG_NEXT(h, status);
176        }
177        if (msg.msg_flags & MSG_TRUNC) {
178            bb_error_msg("message truncated");
179            continue;
180        }
181        if (status) {
182            bb_error_msg_and_die("remnant of size %d!", status);
183        }
184    }
185}
186
187int xrtnl_dump_filter(struct rtnl_handle *rth,
188        int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
189        void *arg1)
190{
191    int ret = rtnl_dump_filter(rth, filter, arg1/*, NULL, NULL*/);
192    if (ret < 0)
193        bb_error_msg_and_die("dump terminated");
194    return ret;
195}
196
197int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
198          unsigned groups, struct nlmsghdr *answer,
199          int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
200          void *jarg)
201{
202    int status;
203    unsigned seq;
204    struct nlmsghdr *h;
205    struct sockaddr_nl nladdr;
206    struct iovec iov = { (void*)n, n->nlmsg_len };
207    char   buf[8192];
208    struct msghdr msg = {
209        (void*)&nladdr, sizeof(nladdr),
210        &iov,   1,
211        NULL,   0,
212        0
213    };
214
215    memset(&nladdr, 0, sizeof(nladdr));
216    nladdr.nl_family = AF_NETLINK;
217    nladdr.nl_pid = peer;
218    nladdr.nl_groups = groups;
219
220    n->nlmsg_seq = seq = ++rtnl->seq;
221    if (answer == NULL) {
222        n->nlmsg_flags |= NLM_F_ACK;
223    }
224    status = sendmsg(rtnl->fd, &msg, 0);
225
226    if (status < 0) {
227        bb_perror_msg("cannot talk to rtnetlink");
228        return -1;
229    }
230
231    iov.iov_base = buf;
232
233    while (1) {
234        iov.iov_len = sizeof(buf);
235        status = recvmsg(rtnl->fd, &msg, 0);
236
237        if (status < 0) {
238            if (errno == EINTR) {
239                continue;
240            }
241            bb_perror_msg("OVERRUN");
242            continue;
243        }
244        if (status == 0) {
245            bb_error_msg("EOF on netlink");
246            return -1;
247        }
248        if (msg.msg_namelen != sizeof(nladdr)) {
249            bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
250        }
251        for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
252            int l_err;
253            int len = h->nlmsg_len;
254            int l = len - sizeof(*h);
255
256            if (l<0 || len>status) {
257                if (msg.msg_flags & MSG_TRUNC) {
258                    bb_error_msg("truncated message");
259                    return -1;
260                }
261                bb_error_msg_and_die("malformed message: len=%d!", len);
262            }
263
264            if (nladdr.nl_pid != peer ||
265                h->nlmsg_pid != rtnl->local.nl_pid ||
266                h->nlmsg_seq != seq) {
267                if (junk) {
268                    l_err = junk(&nladdr, h, jarg);
269                    if (l_err < 0) {
270                        return l_err;
271                    }
272                }
273                continue;
274            }
275
276            if (h->nlmsg_type == NLMSG_ERROR) {
277                struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
278                if (l < sizeof(struct nlmsgerr)) {
279                    bb_error_msg("ERROR truncated");
280                } else {
281                    errno = -err->error;
282                    if (errno == 0) {
283                        if (answer) {
284                            memcpy(answer, h, h->nlmsg_len);
285                        }
286                        return 0;
287                    }
288                    bb_perror_msg("RTNETLINK answers");
289                }
290                return -1;
291            }
292            if (answer) {
293                memcpy(answer, h, h->nlmsg_len);
294                return 0;
295            }
296
297            bb_error_msg("unexpected reply!");
298
299            status -= NLMSG_ALIGN(len);
300            h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
301        }
302        if (msg.msg_flags & MSG_TRUNC) {
303            bb_error_msg("message truncated");
304            continue;
305        }
306        if (status) {
307            bb_error_msg_and_die("remnant of size %d!", status);
308        }
309    }
310}
311
312int addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data)
313{
314    int len = RTA_LENGTH(4);
315    struct rtattr *rta;
316    if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen)
317        return -1;
318    rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
319    rta->rta_type = type;
320    rta->rta_len = len;
321    memcpy(RTA_DATA(rta), &data, 4);
322    n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
323    return 0;
324}
325
326int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
327{
328    int len = RTA_LENGTH(alen);
329    struct rtattr *rta;
330
331    if (NLMSG_ALIGN(n->nlmsg_len) + len > maxlen)
332        return -1;
333    rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
334    rta->rta_type = type;
335    rta->rta_len = len;
336    memcpy(RTA_DATA(rta), data, alen);
337    n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
338    return 0;
339}
340
341int rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data)
342{
343    int len = RTA_LENGTH(4);
344    struct rtattr *subrta;
345
346    if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
347        return -1;
348    }
349    subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
350    subrta->rta_type = type;
351    subrta->rta_len = len;
352    memcpy(RTA_DATA(subrta), &data, 4);
353    rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
354    return 0;
355}
356
357int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
358{
359    struct rtattr *subrta;
360    int len = RTA_LENGTH(alen);
361
362    if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
363        return -1;
364    }
365    subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
366    subrta->rta_type = type;
367    subrta->rta_len = len;
368    memcpy(RTA_DATA(subrta), data, alen);
369    rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
370    return 0;
371}
372
373
374int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
375{
376    while (RTA_OK(rta, len)) {
377        if (rta->rta_type <= max) {
378            tb[rta->rta_type] = rta;
379        }
380        rta = RTA_NEXT(rta,len);
381    }
382    if (len) {
383        bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);
384    }
385    return 0;
386}
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