2 * Copyright (c) 1990, 1991, 1992, 1993, 1996
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution
12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
13 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 static const char copyright[] =
20 "@(#) Copyright (c) 1990, 1991, 1992, 1993, 1996\n\
21 The Regents of the University of California. All rights reserved.\n";
24 #include <sys/cdefs.h>
25 __FBSDID("$FreeBSD$");
28 * rarpd - Reverse ARP Daemon
30 * Usage: rarpd -a [-dfsv] [-t directory] [-P pidfile] [hostname]
31 * rarpd [-dfsv] [-t directory] [-P pidfile] interface [hostname]
33 * 'hostname' is optional solely for backwards compatibility with Sun's rarpd.
34 * Currently, the argument is ignored.
36 #include <sys/param.h>
38 #include <sys/ioctl.h>
39 #include <sys/socket.h>
43 #include <net/ethernet.h>
45 #include <net/if_types.h>
46 #include <net/if_dl.h>
47 #include <net/route.h>
49 #include <netinet/in.h>
50 #include <netinet/if_ether.h>
52 #include <arpa/inet.h>
66 /* Cast a struct sockaddr to a struct sockaddr_in */
67 #define SATOSIN(sa) ((struct sockaddr_in *)(sa))
70 #define TFTP_DIR "/tftpboot"
73 #define ARPSECS (20 * 60) /* as per code in netinet/if_ether.c */
74 #define REVARP_REQUEST ARPOP_REVREQUEST
75 #define REVARP_REPLY ARPOP_REVREPLY
78 * The structure for each interface.
81 struct if_info *ii_next;
82 int ii_fd; /* BPF file descriptor */
83 in_addr_t ii_ipaddr; /* IP address */
84 in_addr_t ii_netmask; /* subnet or net mask */
85 u_char ii_eaddr[ETHER_ADDR_LEN]; /* ethernet address */
86 char ii_ifname[IF_NAMESIZE];
90 * The list of all interfaces that are being listened to. rarp_loop()
91 * "selects" on the descriptors in this list.
93 static struct if_info *iflist;
95 static int verbose; /* verbose messages */
96 static const char *tftp_dir = TFTP_DIR; /* tftp directory */
98 static int dflag; /* messages to stdout/stderr, not syslog(3) */
99 static int sflag; /* ignore /tftpboot */
101 static u_char zero[6];
103 static char pidfile_buf[PATH_MAX];
104 static char *pidfile;
105 #define RARPD_PIDFILE "/var/run/rarpd.%s.pid"
106 static struct pidfh *pidfile_fh;
108 static int bpf_open(void);
109 static in_addr_t choose_ipaddr(in_addr_t **, in_addr_t, in_addr_t);
110 static char *eatoa(u_char *);
111 static int expand_syslog_m(const char *fmt, char **newfmt);
112 static void init(char *);
113 static void init_one(struct ifaddrs *, char *, int);
114 static char *intoa(in_addr_t);
115 static in_addr_t ipaddrtonetmask(in_addr_t);
116 static void logmsg(int, const char *, ...) __printflike(2, 3);
117 static int rarp_bootable(in_addr_t);
118 static int rarp_check(u_char *, u_int);
119 static void rarp_loop(void);
120 static int rarp_open(char *);
121 static void rarp_process(struct if_info *, u_char *, u_int);
122 static void rarp_reply(struct if_info *, struct ether_header *,
124 static void update_arptab(u_char *, in_addr_t);
125 static void usage(void);
128 main(int argc, char *argv[])
131 char *ifname, *hostname, *name;
133 int aflag = 0; /* listen on "all" interfaces */
134 int fflag = 0; /* don't fork */
136 if ((name = strrchr(argv[0], '/')) != NULL)
144 * All error reporting is done through syslog, unless -d is specified
146 openlog(name, LOG_PID | LOG_CONS, LOG_DAEMON);
149 while ((op = getopt(argc, argv, "adfsP:t:v")) != -1)
168 strncpy(pidfile_buf, optarg, sizeof(pidfile_buf) - 1);
169 pidfile_buf[sizeof(pidfile_buf) - 1] = '\0';
170 pidfile = pidfile_buf;
188 ifname = (aflag == 0) ? argv[0] : NULL;
189 hostname = ifname ? argv[1] : argv[0];
191 if ((aflag && ifname) || (!aflag && ifname == NULL))
197 if (pidfile == NULL && ifname != NULL && aflag == 0) {
198 snprintf(pidfile_buf, sizeof(pidfile_buf) - 1,
199 RARPD_PIDFILE, ifname);
200 pidfile_buf[sizeof(pidfile_buf) - 1] = '\0';
201 pidfile = pidfile_buf;
203 /* If pidfile == NULL, /var/run/<progname>.pid will be used. */
204 pidfile_fh = pidfile_open(pidfile, 0600, NULL);
205 if (pidfile_fh == NULL)
206 logmsg(LOG_ERR, "Cannot open or create pidfile: %s",
207 (pidfile == NULL) ? "/var/run/rarpd.pid" : pidfile);
209 logmsg(LOG_ERR, "cannot fork");
210 pidfile_remove(pidfile_fh);
213 pidfile_write(pidfile_fh);
220 * Add to the interface list.
223 init_one(struct ifaddrs *ifa, char *target, int pass1)
225 struct if_info *ii, *ii2;
226 struct sockaddr_dl *ll;
229 family = ifa->ifa_addr->sa_family;
233 /* Consider only AF_LINK during pass1. */
237 if (!(ifa->ifa_flags & IFF_UP) ||
238 (ifa->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)))
245 /* Don't bother going any further if not the target interface */
246 if (target != NULL && strcmp(ifa->ifa_name, target) != 0)
249 /* Look for interface in list */
250 for (ii = iflist; ii != NULL; ii = ii->ii_next)
251 if (strcmp(ifa->ifa_name, ii->ii_ifname) == 0)
254 if (pass1 && ii != NULL)
255 /* We've already seen that interface once. */
258 /* Allocate a new one if not found */
260 ii = (struct if_info *)malloc(sizeof(*ii));
262 logmsg(LOG_ERR, "malloc: %m");
263 pidfile_remove(pidfile_fh);
266 bzero(ii, sizeof(*ii));
268 strlcpy(ii->ii_ifname, ifa->ifa_name, sizeof(ii->ii_ifname));
269 ii->ii_next = iflist;
271 } else if (!pass1 && ii->ii_ipaddr != 0) {
273 * Second AF_INET definition for that interface: clone
274 * the existing one, and work on that cloned one.
275 * This must be another IP address for this interface,
276 * so avoid killing the previous configuration.
278 ii2 = (struct if_info *)malloc(sizeof(*ii2));
280 logmsg(LOG_ERR, "malloc: %m");
281 pidfile_remove(pidfile_fh);
284 memcpy(ii2, ii, sizeof(*ii2));
286 ii2->ii_next = iflist;
294 ii->ii_ipaddr = SATOSIN(ifa->ifa_addr)->sin_addr.s_addr;
295 ii->ii_netmask = SATOSIN(ifa->ifa_netmask)->sin_addr.s_addr;
296 if (ii->ii_netmask == 0)
297 ii->ii_netmask = ipaddrtonetmask(ii->ii_ipaddr);
299 ii->ii_fd = rarp_open(ii->ii_ifname);
303 ll = (struct sockaddr_dl *)ifa->ifa_addr;
304 switch (ll->sdl_type) {
307 bcopy(LLADDR(ll), ii->ii_eaddr, 6);
314 * Initialize all "candidate" interfaces that are in the system
315 * configuration list. A "candidate" is up, not loopback and not
321 struct if_info *ii, *nii, *lii;
322 struct ifaddrs *ifhead, *ifa;
325 error = getifaddrs(&ifhead);
327 logmsg(LOG_ERR, "getifaddrs: %m");
328 pidfile_remove(pidfile_fh);
332 * We make two passes over the list we have got. In the first
333 * one, we only collect AF_LINK interfaces, and initialize our
334 * list of interfaces from them. In the second pass, we
335 * collect the actual IP addresses from the AF_INET
336 * interfaces, and allow for the same interface name to appear
337 * multiple times (in case of more than one IP address).
339 for (ifa = ifhead; ifa != NULL; ifa = ifa->ifa_next)
340 init_one(ifa, target, 1);
341 for (ifa = ifhead; ifa != NULL; ifa = ifa->ifa_next)
342 init_one(ifa, target, 0);
345 /* Throw away incomplete interfaces */
347 for (ii = iflist; ii != NULL; ii = nii) {
349 if (ii->ii_ipaddr == 0 ||
350 bcmp(ii->ii_eaddr, zero, 6) == 0) {
365 for (ii = iflist; ii != NULL; ii = ii->ii_next)
366 logmsg(LOG_DEBUG, "%s %s 0x%08x %s",
367 ii->ii_ifname, intoa(ntohl(ii->ii_ipaddr)),
368 (in_addr_t)ntohl(ii->ii_netmask), eatoa(ii->ii_eaddr));
375 (void)fprintf(stderr, "%s\n%s\n",
376 "usage: rarpd -a [-dfsv] [-t directory] [-P pidfile]",
377 " rarpd [-dfsv] [-t directory] [-P pidfile] interface");
386 char device[sizeof "/dev/bpf000"];
389 * Go through all the minors and find one that isn't in use.
392 (void)sprintf(device, "/dev/bpf%d", n++);
393 fd = open(device, O_RDWR);
394 } while ((fd == -1) && (errno == EBUSY));
397 logmsg(LOG_ERR, "%s: %m", device);
398 pidfile_remove(pidfile_fh);
405 * Open a BPF file and attach it to the interface named 'device'.
406 * Set immediate mode, and set a filter that accepts only RARP requests.
409 rarp_open(char *device)
416 static struct bpf_insn insns[] = {
417 BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 12),
418 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, ETHERTYPE_REVARP, 0, 3),
419 BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 20),
420 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, REVARP_REQUEST, 0, 1),
421 BPF_STMT(BPF_RET|BPF_K, sizeof(struct ether_arp) +
422 sizeof(struct ether_header)),
423 BPF_STMT(BPF_RET|BPF_K, 0),
425 static struct bpf_program filter = {
426 sizeof insns / sizeof(insns[0]),
432 * Set immediate mode so packets are processed as they arrive.
435 if (ioctl(fd, BIOCIMMEDIATE, &immediate) == -1) {
436 logmsg(LOG_ERR, "BIOCIMMEDIATE: %m");
439 strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
440 if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) == -1) {
441 logmsg(LOG_ERR, "BIOCSETIF: %m");
445 * Check that the data link layer is an Ethernet; this code won't
446 * work with anything else.
448 if (ioctl(fd, BIOCGDLT, (caddr_t)&dlt) == -1) {
449 logmsg(LOG_ERR, "BIOCGDLT: %m");
452 if (dlt != DLT_EN10MB) {
453 logmsg(LOG_ERR, "%s is not an ethernet", device);
457 * Set filter program.
459 if (ioctl(fd, BIOCSETF, (caddr_t)&filter) == -1) {
460 logmsg(LOG_ERR, "BIOCSETF: %m");
466 pidfile_remove(pidfile_fh);
471 * Perform various sanity checks on the RARP request packet. Return
472 * false on failure and log the reason.
475 rarp_check(u_char *p, u_int len)
477 struct ether_header *ep = (struct ether_header *)p;
478 struct ether_arp *ap = (struct ether_arp *)(p + sizeof(*ep));
480 if (len < sizeof(*ep) + sizeof(*ap)) {
481 logmsg(LOG_ERR, "truncated request, got %u, expected %lu",
482 len, (u_long)(sizeof(*ep) + sizeof(*ap)));
486 * XXX This test might be better off broken out...
488 if (ntohs(ep->ether_type) != ETHERTYPE_REVARP ||
489 ntohs(ap->arp_hrd) != ARPHRD_ETHER ||
490 ntohs(ap->arp_op) != REVARP_REQUEST ||
491 ntohs(ap->arp_pro) != ETHERTYPE_IP ||
492 ap->arp_hln != 6 || ap->arp_pln != 4) {
493 logmsg(LOG_DEBUG, "request fails sanity check");
496 if (bcmp((char *)&ep->ether_shost, (char *)&ap->arp_sha, 6) != 0) {
497 logmsg(LOG_DEBUG, "ether/arp sender address mismatch");
500 if (bcmp((char *)&ap->arp_sha, (char *)&ap->arp_tha, 6) != 0) {
501 logmsg(LOG_DEBUG, "ether/arp target address mismatch");
508 * Loop indefinitely listening for RARP requests on the
509 * interfaces in 'iflist'.
514 u_char *buf, *bp, *ep;
516 fd_set fds, listeners;
517 int bufsize, maxfd = 0;
520 if (iflist == NULL) {
521 logmsg(LOG_ERR, "no interfaces");
524 if (ioctl(iflist->ii_fd, BIOCGBLEN, (caddr_t)&bufsize) == -1) {
525 logmsg(LOG_ERR, "BIOCGBLEN: %m");
528 buf = malloc(bufsize);
530 logmsg(LOG_ERR, "malloc: %m");
536 * Find the highest numbered file descriptor for select().
537 * Initialize the set of descriptors to listen to.
540 for (ii = iflist; ii != NULL; ii = ii->ii_next) {
541 FD_SET(ii->ii_fd, &fds);
542 if (ii->ii_fd > maxfd)
546 if (select(maxfd + 1, &listeners, NULL, NULL, NULL) == -1) {
547 /* Don't choke when we get ptraced */
550 logmsg(LOG_ERR, "select: %m");
553 for (ii = iflist; ii != NULL; ii = ii->ii_next) {
555 if (!FD_ISSET(fd, &listeners))
558 cc = read(fd, (char *)buf, bufsize);
559 /* Don't choke when we get ptraced */
560 if ((cc == -1) && (errno == EINTR))
563 /* Loop through the packet(s) */
564 #define bhp ((struct bpf_hdr *)bp)
568 u_int caplen, hdrlen;
570 caplen = bhp->bh_caplen;
571 hdrlen = bhp->bh_hdrlen;
572 if (rarp_check(bp + hdrlen, caplen))
573 rarp_process(ii, bp + hdrlen, caplen);
574 bp += BPF_WORDALIGN(hdrlen + caplen);
582 pidfile_remove(pidfile_fh);
587 * True if this server can boot the host whose IP address is 'addr'.
588 * This check is made by looking in the tftp directory for the
589 * configuration file.
592 rarp_bootable(in_addr_t addr)
597 static DIR *dd = NULL;
599 (void)sprintf(ipname, "%08X", (in_addr_t)ntohl(addr));
602 * If directory is already open, rewind it. Otherwise, open it.
604 if ((d = dd) != NULL)
607 if (chdir(tftp_dir) == -1) {
608 logmsg(LOG_ERR, "chdir: %s: %m", tftp_dir);
609 goto rarp_bootable_err;
613 logmsg(LOG_ERR, "opendir: %m");
614 goto rarp_bootable_err;
618 while ((dent = readdir(d)) != NULL)
619 if (strncmp(dent->d_name, ipname, 8) == 0)
624 pidfile_remove(pidfile_fh);
629 * Given a list of IP addresses, 'alist', return the first address that
630 * is on network 'net'; 'netmask' is a mask indicating the network portion
634 choose_ipaddr(in_addr_t **alist, in_addr_t net, in_addr_t netmask)
637 for (; *alist; ++alist)
638 if ((**alist & netmask) == net)
644 * Answer the RARP request in 'pkt', on the interface 'ii'. 'pkt' has
645 * already been checked for validity. The reply is overlaid on the request.
648 rarp_process(struct if_info *ii, u_char *pkt, u_int len)
650 struct ether_header *ep;
652 in_addr_t target_ipaddr;
655 ep = (struct ether_header *)pkt;
656 /* should this be arp_tha? */
657 if (ether_ntohost(ename, (struct ether_addr *)&ep->ether_shost) != 0) {
658 logmsg(LOG_ERR, "cannot map %s to name",
659 eatoa(ep->ether_shost));
663 if ((hp = gethostbyname(ename)) == NULL) {
664 logmsg(LOG_ERR, "cannot map %s to IP address", ename);
669 * Choose correct address from list.
671 if (hp->h_addrtype != AF_INET) {
672 logmsg(LOG_ERR, "cannot handle non IP addresses for %s",
676 target_ipaddr = choose_ipaddr((in_addr_t **)hp->h_addr_list,
677 ii->ii_ipaddr & ii->ii_netmask,
679 if (target_ipaddr == 0) {
680 logmsg(LOG_ERR, "cannot find %s on net %s",
681 ename, intoa(ntohl(ii->ii_ipaddr & ii->ii_netmask)));
684 if (sflag || rarp_bootable(target_ipaddr))
685 rarp_reply(ii, ep, target_ipaddr, len);
686 else if (verbose > 1)
687 logmsg(LOG_INFO, "%s %s at %s DENIED (not bootable)",
689 eatoa(ep->ether_shost),
690 intoa(ntohl(target_ipaddr)));
694 * Poke the kernel arp tables with the ethernet/ip address combinataion
695 * given. When processing a reply, we must do this so that the booting
696 * host (i.e. the guy running rarpd), won't try to ARP for the hardware
697 * address of the guy being booted (he cannot answer the ARP).
699 static struct sockaddr_inarp sin_inarp = {
700 sizeof(struct sockaddr_inarp), AF_INET, 0,
706 static struct sockaddr_dl sin_dl = {
707 sizeof(struct sockaddr_dl), AF_LINK, 0, IFT_ETHER, 0, 6,
712 struct rt_msghdr rthdr;
717 update_arptab(u_char *ep, in_addr_t ipaddr)
721 struct sockaddr_inarp *ar, *ar2;
722 struct sockaddr_dl *ll, *ll2;
723 struct rt_msghdr *rt;
729 r = socket(PF_ROUTE, SOCK_RAW, 0);
731 logmsg(LOG_ERR, "raw route socket: %m");
732 pidfile_remove(pidfile_fh);
738 ar->sin_addr.s_addr = ipaddr;
740 bcopy(ep, LLADDR(ll), 6);
742 /* Get the type and interface index */
744 bzero(rt, sizeof(rtmsg));
745 rt->rtm_version = RTM_VERSION;
746 rt->rtm_addrs = RTA_DST;
747 rt->rtm_type = RTM_GET;
749 ar2 = (struct sockaddr_inarp *)rtmsg.rtspace;
750 bcopy(ar, ar2, sizeof(*ar));
751 rt->rtm_msglen = sizeof(*rt) + sizeof(*ar);
753 if ((write(r, rt, rt->rtm_msglen) == -1) && (errno != ESRCH)) {
754 logmsg(LOG_ERR, "rtmsg get write: %m");
759 cc = read(r, rt, sizeof(rtmsg));
760 } while (cc > 0 && (rt->rtm_seq != seq || rt->rtm_pid != pid));
762 logmsg(LOG_ERR, "rtmsg get read: %m");
766 ll2 = (struct sockaddr_dl *)((u_char *)ar2 + ar2->sin_len);
767 if (ll2->sdl_family != AF_LINK) {
769 * XXX I think this means the ip address is not on a
770 * directly connected network (the family is AF_INET in
773 logmsg(LOG_ERR, "bogus link family (%d) wrong net for %08X?\n",
774 ll2->sdl_family, ipaddr);
778 xtype = ll2->sdl_type;
779 xindex = ll2->sdl_index;
781 /* Set the new arp entry */
782 bzero(rt, sizeof(rtmsg));
783 rt->rtm_version = RTM_VERSION;
784 rt->rtm_addrs = RTA_DST | RTA_GATEWAY;
785 rt->rtm_inits = RTV_EXPIRE;
786 clock_gettime(CLOCK_MONOTONIC, &tp);
787 rt->rtm_rmx.rmx_expire = tp.tv_sec + ARPSECS;
788 rt->rtm_flags = RTF_HOST | RTF_STATIC;
789 rt->rtm_type = RTM_ADD;
792 bcopy(ar, ar2, sizeof(*ar));
794 ll2 = (struct sockaddr_dl *)((u_char *)ar2 + sizeof(*ar2));
795 bcopy(ll, ll2, sizeof(*ll));
796 ll2->sdl_type = xtype;
797 ll2->sdl_index = xindex;
799 rt->rtm_msglen = sizeof(*rt) + sizeof(*ar2) + sizeof(*ll2);
801 if ((write(r, rt, rt->rtm_msglen) == -1) && (errno != EEXIST)) {
802 logmsg(LOG_ERR, "rtmsg add write: %m");
807 cc = read(r, rt, sizeof(rtmsg));
808 } while (cc > 0 && (rt->rtm_seq != seq || rt->rtm_pid != pid));
811 logmsg(LOG_ERR, "rtmsg add read: %m");
817 * Build a reverse ARP packet and sent it out on the interface.
818 * 'ep' points to a valid REVARP_REQUEST. The REVARP_REPLY is built
819 * on top of the request, then written to the network.
821 * RFC 903 defines the ether_arp fields as follows. The following comments
822 * are taken (more or less) straight from this document.
826 * arp_sha is the hardware address of the sender of the packet.
827 * arp_spa is undefined.
828 * arp_tha is the 'target' hardware address.
829 * In the case where the sender wishes to determine his own
830 * protocol address, this, like arp_sha, will be the hardware
831 * address of the sender.
832 * arp_tpa is undefined.
836 * arp_sha is the hardware address of the responder (the sender of the
838 * arp_spa is the protocol address of the responder (see the note below).
839 * arp_tha is the hardware address of the target, and should be the same as
840 * that which was given in the request.
841 * arp_tpa is the protocol address of the target, that is, the desired address.
843 * Note that the requirement that arp_spa be filled in with the responder's
844 * protocol is purely for convenience. For instance, if a system were to use
845 * both ARP and RARP, then the inclusion of the valid protocol-hardware
846 * address pair (arp_spa, arp_sha) may eliminate the need for a subsequent
850 rarp_reply(struct if_info *ii, struct ether_header *ep, in_addr_t ipaddr,
854 struct ether_arp *ap = (struct ether_arp *)(ep + 1);
856 update_arptab((u_char *)&ap->arp_sha, ipaddr);
859 * Build the rarp reply by modifying the rarp request in place.
861 ap->arp_op = htons(REVARP_REPLY);
864 ep->ether_type = ETHERTYPE_REVARP;
866 bcopy((char *)&ap->arp_sha, (char *)&ep->ether_dhost, 6);
867 bcopy((char *)ii->ii_eaddr, (char *)&ep->ether_shost, 6);
868 bcopy((char *)ii->ii_eaddr, (char *)&ap->arp_sha, 6);
870 bcopy((char *)&ipaddr, (char *)ap->arp_tpa, 4);
871 /* Target hardware is unchanged. */
872 bcopy((char *)&ii->ii_ipaddr, (char *)ap->arp_spa, 4);
874 /* Zero possible garbage after packet. */
875 bzero((char *)ep + (sizeof(*ep) + sizeof(*ap)),
876 len - (sizeof(*ep) + sizeof(*ap)));
877 n = write(ii->ii_fd, (char *)ep, len);
879 logmsg(LOG_ERR, "write: only %d of %d bytes written", n, len);
881 logmsg(LOG_INFO, "%s %s at %s REPLIED", ii->ii_ifname,
883 intoa(ntohl(ipaddr)));
887 * Get the netmask of an IP address. This routine is used if
888 * SIOCGIFNETMASK doesn't work.
891 ipaddrtonetmask(in_addr_t addr)
896 return htonl(IN_CLASSA_NET);
898 return htonl(IN_CLASSB_NET);
900 return htonl(IN_CLASSC_NET);
901 logmsg(LOG_DEBUG, "unknown IP address class: %08X", addr);
902 return htonl(0xffffffff);
906 * A faster replacement for inet_ntoa().
909 intoa(in_addr_t addr)
914 static char buf[sizeof(".xxx.xxx.xxx.xxx")];
916 cp = &buf[sizeof buf];
922 *--cp = byte % 10 + '0';
925 *--cp = byte % 10 + '0';
940 static char buf[sizeof("xx:xx:xx:xx:xx:xx")];
942 (void)sprintf(buf, "%x:%x:%x:%x:%x:%x",
943 ea[0], ea[1], ea[2], ea[3], ea[4], ea[5]);
948 logmsg(int pri, const char *fmt, ...)
960 if (expand_syslog_m(fmt, &newfmt) == -1) {
961 vfprintf(fp, fmt, v);
963 vfprintf(fp, newfmt, v);
969 vsyslog(pri, fmt, v);
975 expand_syslog_m(const char *fmt, char **newfmt) {
981 while ((m = strstr(str, "%m")) != NULL) {
982 asprintf(&np, "%s%.*s%s", p, (int)(m - str),
983 str, strerror(errno));
994 asprintf(&np, "%s%s", p, str);