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[])
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;
190 if ((aflag && ifname) || (!aflag && ifname == NULL))
196 if (pidfile == NULL && ifname != NULL && aflag == 0) {
197 snprintf(pidfile_buf, sizeof(pidfile_buf) - 1,
198 RARPD_PIDFILE, ifname);
199 pidfile_buf[sizeof(pidfile_buf) - 1] = '\0';
200 pidfile = pidfile_buf;
202 /* If pidfile == NULL, /var/run/<progname>.pid will be used. */
203 pidfile_fh = pidfile_open(pidfile, 0600, NULL);
204 if (pidfile_fh == NULL)
205 logmsg(LOG_ERR, "Cannot open or create pidfile: %s",
206 (pidfile == NULL) ? "/var/run/rarpd.pid" : pidfile);
208 logmsg(LOG_ERR, "cannot fork");
209 pidfile_remove(pidfile_fh);
212 pidfile_write(pidfile_fh);
219 * Add to the interface list.
222 init_one(struct ifaddrs *ifa, char *target, int pass1)
224 struct if_info *ii, *ii2;
225 struct sockaddr_dl *ll;
228 family = ifa->ifa_addr->sa_family;
232 /* Consider only AF_LINK during pass1. */
236 if (!(ifa->ifa_flags & IFF_UP) ||
237 (ifa->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)))
244 /* Don't bother going any further if not the target interface */
245 if (target != NULL && strcmp(ifa->ifa_name, target) != 0)
248 /* Look for interface in list */
249 for (ii = iflist; ii != NULL; ii = ii->ii_next)
250 if (strcmp(ifa->ifa_name, ii->ii_ifname) == 0)
253 if (pass1 && ii != NULL)
254 /* We've already seen that interface once. */
257 /* Allocate a new one if not found */
259 ii = (struct if_info *)malloc(sizeof(*ii));
261 logmsg(LOG_ERR, "malloc: %m");
262 pidfile_remove(pidfile_fh);
265 bzero(ii, sizeof(*ii));
267 strlcpy(ii->ii_ifname, ifa->ifa_name, sizeof(ii->ii_ifname));
268 ii->ii_next = iflist;
270 } else if (!pass1 && ii->ii_ipaddr != 0) {
272 * Second AF_INET definition for that interface: clone
273 * the existing one, and work on that cloned one.
274 * This must be another IP address for this interface,
275 * so avoid killing the previous configuration.
277 ii2 = (struct if_info *)malloc(sizeof(*ii2));
279 logmsg(LOG_ERR, "malloc: %m");
280 pidfile_remove(pidfile_fh);
283 memcpy(ii2, ii, sizeof(*ii2));
285 ii2->ii_next = iflist;
293 ii->ii_ipaddr = SATOSIN(ifa->ifa_addr)->sin_addr.s_addr;
294 ii->ii_netmask = SATOSIN(ifa->ifa_netmask)->sin_addr.s_addr;
295 if (ii->ii_netmask == 0)
296 ii->ii_netmask = ipaddrtonetmask(ii->ii_ipaddr);
298 ii->ii_fd = rarp_open(ii->ii_ifname);
302 ll = (struct sockaddr_dl *)ifa->ifa_addr;
303 switch (ll->sdl_type) {
306 bcopy(LLADDR(ll), ii->ii_eaddr, 6);
313 * Initialize all "candidate" interfaces that are in the system
314 * configuration list. A "candidate" is up, not loopback and not
320 struct if_info *ii, *nii, *lii;
321 struct ifaddrs *ifhead, *ifa;
324 error = getifaddrs(&ifhead);
326 logmsg(LOG_ERR, "getifaddrs: %m");
327 pidfile_remove(pidfile_fh);
331 * We make two passes over the list we have got. In the first
332 * one, we only collect AF_LINK interfaces, and initialize our
333 * list of interfaces from them. In the second pass, we
334 * collect the actual IP addresses from the AF_INET
335 * interfaces, and allow for the same interface name to appear
336 * multiple times (in case of more than one IP address).
338 for (ifa = ifhead; ifa != NULL; ifa = ifa->ifa_next)
339 init_one(ifa, target, 1);
340 for (ifa = ifhead; ifa != NULL; ifa = ifa->ifa_next)
341 init_one(ifa, target, 0);
344 /* Throw away incomplete interfaces */
346 for (ii = iflist; ii != NULL; ii = nii) {
348 if (ii->ii_ipaddr == 0 ||
349 bcmp(ii->ii_eaddr, zero, 6) == 0) {
364 for (ii = iflist; ii != NULL; ii = ii->ii_next)
365 logmsg(LOG_DEBUG, "%s %s 0x%08x %s",
366 ii->ii_ifname, intoa(ntohl(ii->ii_ipaddr)),
367 (in_addr_t)ntohl(ii->ii_netmask), eatoa(ii->ii_eaddr));
374 (void)fprintf(stderr, "%s\n%s\n",
375 "usage: rarpd -a [-dfsv] [-t directory] [-P pidfile]",
376 " rarpd [-dfsv] [-t directory] [-P pidfile] interface");
385 char device[sizeof "/dev/bpf000"];
388 * Go through all the minors and find one that isn't in use.
391 (void)sprintf(device, "/dev/bpf%d", n++);
392 fd = open(device, O_RDWR);
393 } while ((fd == -1) && (errno == EBUSY));
396 logmsg(LOG_ERR, "%s: %m", device);
397 pidfile_remove(pidfile_fh);
404 * Open a BPF file and attach it to the interface named 'device'.
405 * Set immediate mode, and set a filter that accepts only RARP requests.
408 rarp_open(char *device)
415 static struct bpf_insn insns[] = {
416 BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 12),
417 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, ETHERTYPE_REVARP, 0, 3),
418 BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 20),
419 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, REVARP_REQUEST, 0, 1),
420 BPF_STMT(BPF_RET|BPF_K, sizeof(struct ether_arp) +
421 sizeof(struct ether_header)),
422 BPF_STMT(BPF_RET|BPF_K, 0),
424 static struct bpf_program filter = {
425 sizeof insns / sizeof(insns[0]),
431 * Set immediate mode so packets are processed as they arrive.
434 if (ioctl(fd, BIOCIMMEDIATE, &immediate) == -1) {
435 logmsg(LOG_ERR, "BIOCIMMEDIATE: %m");
438 strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
439 if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) == -1) {
440 logmsg(LOG_ERR, "BIOCSETIF: %m");
444 * Check that the data link layer is an Ethernet; this code won't
445 * work with anything else.
447 if (ioctl(fd, BIOCGDLT, (caddr_t)&dlt) == -1) {
448 logmsg(LOG_ERR, "BIOCGDLT: %m");
451 if (dlt != DLT_EN10MB) {
452 logmsg(LOG_ERR, "%s is not an ethernet", device);
456 * Set filter program.
458 if (ioctl(fd, BIOCSETF, (caddr_t)&filter) == -1) {
459 logmsg(LOG_ERR, "BIOCSETF: %m");
465 pidfile_remove(pidfile_fh);
470 * Perform various sanity checks on the RARP request packet. Return
471 * false on failure and log the reason.
474 rarp_check(u_char *p, u_int len)
476 struct ether_header *ep = (struct ether_header *)p;
477 struct ether_arp *ap = (struct ether_arp *)(p + sizeof(*ep));
479 if (len < sizeof(*ep) + sizeof(*ap)) {
480 logmsg(LOG_ERR, "truncated request, got %u, expected %lu",
481 len, (u_long)(sizeof(*ep) + sizeof(*ap)));
485 * XXX This test might be better off broken out...
487 if (ntohs(ep->ether_type) != ETHERTYPE_REVARP ||
488 ntohs(ap->arp_hrd) != ARPHRD_ETHER ||
489 ntohs(ap->arp_op) != REVARP_REQUEST ||
490 ntohs(ap->arp_pro) != ETHERTYPE_IP ||
491 ap->arp_hln != 6 || ap->arp_pln != 4) {
492 logmsg(LOG_DEBUG, "request fails sanity check");
495 if (bcmp((char *)&ep->ether_shost, (char *)&ap->arp_sha, 6) != 0) {
496 logmsg(LOG_DEBUG, "ether/arp sender address mismatch");
499 if (bcmp((char *)&ap->arp_sha, (char *)&ap->arp_tha, 6) != 0) {
500 logmsg(LOG_DEBUG, "ether/arp target address mismatch");
507 * Loop indefinitely listening for RARP requests on the
508 * interfaces in 'iflist'.
513 u_char *buf, *bp, *ep;
515 fd_set fds, listeners;
516 int bufsize, maxfd = 0;
519 if (iflist == NULL) {
520 logmsg(LOG_ERR, "no interfaces");
523 if (ioctl(iflist->ii_fd, BIOCGBLEN, (caddr_t)&bufsize) == -1) {
524 logmsg(LOG_ERR, "BIOCGBLEN: %m");
527 buf = malloc(bufsize);
529 logmsg(LOG_ERR, "malloc: %m");
535 * Find the highest numbered file descriptor for select().
536 * Initialize the set of descriptors to listen to.
539 for (ii = iflist; ii != NULL; ii = ii->ii_next) {
540 FD_SET(ii->ii_fd, &fds);
541 if (ii->ii_fd > maxfd)
545 if (select(maxfd + 1, &listeners, NULL, NULL, NULL) == -1) {
546 /* Don't choke when we get ptraced */
549 logmsg(LOG_ERR, "select: %m");
552 for (ii = iflist; ii != NULL; ii = ii->ii_next) {
554 if (!FD_ISSET(fd, &listeners))
557 cc = read(fd, (char *)buf, bufsize);
558 /* Don't choke when we get ptraced */
559 if ((cc == -1) && (errno == EINTR))
562 /* Loop through the packet(s) */
563 #define bhp ((struct bpf_hdr *)bp)
567 u_int caplen, hdrlen;
569 caplen = bhp->bh_caplen;
570 hdrlen = bhp->bh_hdrlen;
571 if (rarp_check(bp + hdrlen, caplen))
572 rarp_process(ii, bp + hdrlen, caplen);
573 bp += BPF_WORDALIGN(hdrlen + caplen);
581 pidfile_remove(pidfile_fh);
586 * True if this server can boot the host whose IP address is 'addr'.
587 * This check is made by looking in the tftp directory for the
588 * configuration file.
591 rarp_bootable(in_addr_t addr)
596 static DIR *dd = NULL;
598 (void)sprintf(ipname, "%08X", (in_addr_t)ntohl(addr));
601 * If directory is already open, rewind it. Otherwise, open it.
603 if ((d = dd) != NULL)
606 if (chdir(tftp_dir) == -1) {
607 logmsg(LOG_ERR, "chdir: %s: %m", tftp_dir);
608 goto rarp_bootable_err;
612 logmsg(LOG_ERR, "opendir: %m");
613 goto rarp_bootable_err;
617 while ((dent = readdir(d)) != NULL)
618 if (strncmp(dent->d_name, ipname, 8) == 0)
623 pidfile_remove(pidfile_fh);
628 * Given a list of IP addresses, 'alist', return the first address that
629 * is on network 'net'; 'netmask' is a mask indicating the network portion
633 choose_ipaddr(in_addr_t **alist, in_addr_t net, in_addr_t netmask)
636 for (; *alist; ++alist)
637 if ((**alist & netmask) == net)
643 * Answer the RARP request in 'pkt', on the interface 'ii'. 'pkt' has
644 * already been checked for validity. The reply is overlaid on the request.
647 rarp_process(struct if_info *ii, u_char *pkt, u_int len)
649 struct ether_header *ep;
651 in_addr_t target_ipaddr;
654 ep = (struct ether_header *)pkt;
655 /* should this be arp_tha? */
656 if (ether_ntohost(ename, (struct ether_addr *)&ep->ether_shost) != 0) {
657 logmsg(LOG_ERR, "cannot map %s to name",
658 eatoa(ep->ether_shost));
662 if ((hp = gethostbyname(ename)) == NULL) {
663 logmsg(LOG_ERR, "cannot map %s to IP address", ename);
668 * Choose correct address from list.
670 if (hp->h_addrtype != AF_INET) {
671 logmsg(LOG_ERR, "cannot handle non IP addresses for %s",
675 target_ipaddr = choose_ipaddr((in_addr_t **)hp->h_addr_list,
676 ii->ii_ipaddr & ii->ii_netmask,
678 if (target_ipaddr == 0) {
679 logmsg(LOG_ERR, "cannot find %s on net %s",
680 ename, intoa(ntohl(ii->ii_ipaddr & ii->ii_netmask)));
683 if (sflag || rarp_bootable(target_ipaddr))
684 rarp_reply(ii, ep, target_ipaddr, len);
685 else if (verbose > 1)
686 logmsg(LOG_INFO, "%s %s at %s DENIED (not bootable)",
688 eatoa(ep->ether_shost),
689 intoa(ntohl(target_ipaddr)));
693 * Poke the kernel arp tables with the ethernet/ip address combinataion
694 * given. When processing a reply, we must do this so that the booting
695 * host (i.e. the guy running rarpd), won't try to ARP for the hardware
696 * address of the guy being booted (he cannot answer the ARP).
698 static struct sockaddr_in sin_inarp = {
699 sizeof(struct sockaddr_in), AF_INET, 0,
704 static struct sockaddr_dl sin_dl = {
705 sizeof(struct sockaddr_dl), AF_LINK, 0, IFT_ETHER, 0, 6,
710 struct rt_msghdr rthdr;
715 update_arptab(u_char *ep, in_addr_t ipaddr)
719 struct sockaddr_in *ar, *ar2;
720 struct sockaddr_dl *ll, *ll2;
721 struct rt_msghdr *rt;
727 r = socket(PF_ROUTE, SOCK_RAW, 0);
729 logmsg(LOG_ERR, "raw route socket: %m");
730 pidfile_remove(pidfile_fh);
736 ar->sin_addr.s_addr = ipaddr;
738 bcopy(ep, LLADDR(ll), 6);
740 /* Get the type and interface index */
742 bzero(rt, sizeof(rtmsg));
743 rt->rtm_version = RTM_VERSION;
744 rt->rtm_addrs = RTA_DST;
745 rt->rtm_type = RTM_GET;
747 ar2 = (struct sockaddr_in *)rtmsg.rtspace;
748 bcopy(ar, ar2, sizeof(*ar));
749 rt->rtm_msglen = sizeof(*rt) + sizeof(*ar);
751 if ((write(r, rt, rt->rtm_msglen) == -1) && (errno != ESRCH)) {
752 logmsg(LOG_ERR, "rtmsg get write: %m");
757 cc = read(r, rt, sizeof(rtmsg));
758 } while (cc > 0 && (rt->rtm_seq != seq || rt->rtm_pid != pid));
760 logmsg(LOG_ERR, "rtmsg get read: %m");
764 ll2 = (struct sockaddr_dl *)((u_char *)ar2 + ar2->sin_len);
765 if (ll2->sdl_family != AF_LINK) {
767 * XXX I think this means the ip address is not on a
768 * directly connected network (the family is AF_INET in
771 logmsg(LOG_ERR, "bogus link family (%d) wrong net for %08X?\n",
772 ll2->sdl_family, ipaddr);
776 xtype = ll2->sdl_type;
777 xindex = ll2->sdl_index;
779 /* Set the new arp entry */
780 bzero(rt, sizeof(rtmsg));
781 rt->rtm_version = RTM_VERSION;
782 rt->rtm_addrs = RTA_DST | RTA_GATEWAY;
783 rt->rtm_inits = RTV_EXPIRE;
784 clock_gettime(CLOCK_MONOTONIC, &tp);
785 rt->rtm_rmx.rmx_expire = tp.tv_sec + ARPSECS;
786 rt->rtm_flags = RTF_HOST | RTF_STATIC;
787 rt->rtm_type = RTM_ADD;
790 bcopy(ar, ar2, sizeof(*ar));
792 ll2 = (struct sockaddr_dl *)((u_char *)ar2 + sizeof(*ar2));
793 bcopy(ll, ll2, sizeof(*ll));
794 ll2->sdl_type = xtype;
795 ll2->sdl_index = xindex;
797 rt->rtm_msglen = sizeof(*rt) + sizeof(*ar2) + sizeof(*ll2);
799 if ((write(r, rt, rt->rtm_msglen) == -1) && (errno != EEXIST)) {
800 logmsg(LOG_ERR, "rtmsg add write: %m");
805 cc = read(r, rt, sizeof(rtmsg));
806 } while (cc > 0 && (rt->rtm_seq != seq || rt->rtm_pid != pid));
809 logmsg(LOG_ERR, "rtmsg add read: %m");
815 * Build a reverse ARP packet and sent it out on the interface.
816 * 'ep' points to a valid REVARP_REQUEST. The REVARP_REPLY is built
817 * on top of the request, then written to the network.
819 * RFC 903 defines the ether_arp fields as follows. The following comments
820 * are taken (more or less) straight from this document.
824 * arp_sha is the hardware address of the sender of the packet.
825 * arp_spa is undefined.
826 * arp_tha is the 'target' hardware address.
827 * In the case where the sender wishes to determine his own
828 * protocol address, this, like arp_sha, will be the hardware
829 * address of the sender.
830 * arp_tpa is undefined.
834 * arp_sha is the hardware address of the responder (the sender of the
836 * arp_spa is the protocol address of the responder (see the note below).
837 * arp_tha is the hardware address of the target, and should be the same as
838 * that which was given in the request.
839 * arp_tpa is the protocol address of the target, that is, the desired address.
841 * Note that the requirement that arp_spa be filled in with the responder's
842 * protocol is purely for convenience. For instance, if a system were to use
843 * both ARP and RARP, then the inclusion of the valid protocol-hardware
844 * address pair (arp_spa, arp_sha) may eliminate the need for a subsequent
848 rarp_reply(struct if_info *ii, struct ether_header *ep, in_addr_t ipaddr,
852 struct ether_arp *ap = (struct ether_arp *)(ep + 1);
854 update_arptab((u_char *)&ap->arp_sha, ipaddr);
857 * Build the rarp reply by modifying the rarp request in place.
859 ap->arp_op = htons(REVARP_REPLY);
862 ep->ether_type = ETHERTYPE_REVARP;
864 bcopy((char *)&ap->arp_sha, (char *)&ep->ether_dhost, 6);
865 bcopy((char *)ii->ii_eaddr, (char *)&ep->ether_shost, 6);
866 bcopy((char *)ii->ii_eaddr, (char *)&ap->arp_sha, 6);
868 bcopy((char *)&ipaddr, (char *)ap->arp_tpa, 4);
869 /* Target hardware is unchanged. */
870 bcopy((char *)&ii->ii_ipaddr, (char *)ap->arp_spa, 4);
872 /* Zero possible garbage after packet. */
873 bzero((char *)ep + (sizeof(*ep) + sizeof(*ap)),
874 len - (sizeof(*ep) + sizeof(*ap)));
875 n = write(ii->ii_fd, (char *)ep, len);
877 logmsg(LOG_ERR, "write: only %d of %d bytes written", n, len);
879 logmsg(LOG_INFO, "%s %s at %s REPLIED", ii->ii_ifname,
881 intoa(ntohl(ipaddr)));
885 * Get the netmask of an IP address. This routine is used if
886 * SIOCGIFNETMASK doesn't work.
889 ipaddrtonetmask(in_addr_t addr)
894 return htonl(IN_CLASSA_NET);
896 return htonl(IN_CLASSB_NET);
898 return htonl(IN_CLASSC_NET);
899 logmsg(LOG_DEBUG, "unknown IP address class: %08X", addr);
900 return htonl(0xffffffff);
904 * A faster replacement for inet_ntoa().
907 intoa(in_addr_t addr)
912 static char buf[sizeof(".xxx.xxx.xxx.xxx")];
914 cp = &buf[sizeof buf];
920 *--cp = byte % 10 + '0';
923 *--cp = byte % 10 + '0';
938 static char buf[sizeof("xx:xx:xx:xx:xx:xx")];
940 (void)sprintf(buf, "%x:%x:%x:%x:%x:%x",
941 ea[0], ea[1], ea[2], ea[3], ea[4], ea[5]);
946 logmsg(int pri, const char *fmt, ...)
958 if (expand_syslog_m(fmt, &newfmt) == -1) {
959 vfprintf(fp, fmt, v);
961 vfprintf(fp, newfmt, v);
967 vsyslog(pri, fmt, v);
973 expand_syslog_m(const char *fmt, char **newfmt) {
979 while ((m = strstr(str, "%m")) != NULL) {
980 asprintf(&np, "%s%.*s%s", p, (int)(m - str),
981 str, strerror(errno));
992 asprintf(&np, "%s%s", p, str);