/* $OpenBSD: rusers.c,v 1.29 2007/09/02 15:19:34 deraadt Exp $ */ /* * Copyright (c) 2001, 2003 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ /*- * Copyright (c) 1993 John Brezak * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef lint static const char rcsid[] = "$OpenBSD: rusers.c,v 1.29 2007/09/02 15:19:34 deraadt Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include /* Old protocol version */ #include #include #include #include #include #include #include #include #include #include #include /* Preferred formatting */ #define HOST_WIDTH 17 #define LINE_WIDTH 8 #define NAME_WIDTH 8 #define MAX_BROADCAST_SIZE 1400 struct host_info { u_int count; u_int idle; char *host; rusers_utmp *users; } *hostinfo; void print_entry(struct host_info *, int); void fmt_idle(int, char *, size_t); void onehost(char *); void allhosts(void); void sorthosts(void); void expandhosts(void); void alarmclock(int); char *estrndup(const char *, size_t); struct host_info *add_host(char *); int hcompare(const void *, const void *); int icompare(const void *, const void *); int ucompare(const void *, const void *); bool_t rusers_reply(char *, struct sockaddr_in *); bool_t rusers_reply_3(char *, struct sockaddr_in *); enum clnt_stat get_reply(int, in_port_t, u_long, struct rpc_msg *, struct rmtcallres *, bool_t (*)(char *, struct sockaddr_in *)); enum clnt_stat rpc_setup(int *, XDR *, struct rpc_msg *, struct rmtcallargs *, AUTH *, char *); __dead void usage(void); int aflag, hflag, iflag, lflag, uflag; u_int nentries, maxentries; long termwidth; extern char *__progname; int main(int argc, char **argv) { struct winsize win; char *cp, *ep; int ch; while ((ch = getopt(argc, argv, "ahilu")) != -1) switch (ch) { case 'a': aflag = 1; break; case 'h': hflag = 1; break; case 'i': iflag = 1; break; case 'l': lflag = 1; break; case 'u': uflag = 1; break; default: usage(); /*NOTREACHED*/ } if (hflag + iflag + uflag > 1) usage(); if (isatty(STDOUT_FILENO)) { if ((cp = getenv("COLUMNS")) != NULL && *cp != '\0') { termwidth = strtol(cp, &ep, 10); if (*ep != '\0' || termwidth >= INT_MAX || termwidth < 0) termwidth = 0; } if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && win.ws_col > 0) termwidth = win.ws_col; else termwidth = 80; } else termwidth = 80; setlinebuf(stdout); if (argc == optind) { if (hflag || iflag || uflag) { puts("Collecting responses..."); allhosts(); sorthosts(); } else allhosts(); } else { aflag = 1; for (; optind < argc; optind++) (void) onehost(argv[optind]); if (hflag || iflag || uflag) sorthosts(); } exit(0); } struct host_info * add_host(char *host) { int i; for (i = 0; i < nentries; i++) { /* Existing entry. */ if (strcmp(host, hostinfo[i].host) == 0) return(NULL); } /* New entry, allocate space if needed and store. */ if (nentries == maxentries) { maxentries += 128; hostinfo = realloc(hostinfo, sizeof(*hostinfo) * maxentries); if (hostinfo == NULL) err(1, NULL); } if ((hostinfo[nentries].host = strdup(host)) == NULL) err(1, NULL); return(&hostinfo[nentries++]); } void fmt_idle(int idle, char *idle_time, size_t idle_time_len) { int days, hours, minutes, seconds; switch (idle) { case 0: *idle_time = '\0'; break; case INT_MAX: strlcpy(idle_time, "??", idle_time_len); break; default: seconds = idle; days = seconds / (60*60*24); seconds %= (60*60*24); hours = seconds / (60*60); seconds %= (60*60); minutes = seconds / 60; seconds %= 60; if (idle >= (24*60*60)) snprintf(idle_time, idle_time_len, "%d day%s, %d:%02d:%02d", days, days > 1 ? "s" : "", hours, minutes, seconds); else if (idle >= (60*60)) snprintf(idle_time, idle_time_len, "%2d:%02d:%02d", hours, minutes, seconds); else if (idle > 60) snprintf(idle_time, idle_time_len, "%2d:%02d", minutes, seconds); else snprintf(idle_time, idle_time_len, " :%02d", idle); break; } } bool_t rusers_reply(char *replyp, struct sockaddr_in *raddrp) { utmpidlearr *up = (utmpidlearr *)replyp; struct host_info *entry; struct hostent *hp; rusers_utmp *ut; char *host; int i; if (!aflag && up->uia_cnt == 0) return(0); hp = gethostbyaddr((char *)&raddrp->sin_addr, sizeof(struct in_addr), AF_INET); if (hp) host = hp->h_name; else host = inet_ntoa(raddrp->sin_addr); if ((entry = add_host(host)) == NULL) return(0); if (up->uia_cnt == 0) ut = NULL; else if ((ut = calloc(up->uia_cnt, sizeof(*ut))) == NULL) err(1, NULL); entry->users = ut; entry->count = up->uia_cnt; entry->idle = UINT_MAX; for (i = 0; i < up->uia_cnt; i++, ut++) { ut->ut_user = estrndup(up->uia_arr[i]->ui_utmp.ut_name, RNUSERS_MAXUSERLEN); ut->ut_line = estrndup(up->uia_arr[i]->ui_utmp.ut_line, RNUSERS_MAXLINELEN); ut->ut_host = estrndup(up->uia_arr[i]->ui_utmp.ut_host, RNUSERS_MAXHOSTLEN); ut->ut_time = up->uia_arr[i]->ui_utmp.ut_time; ut->ut_idle = up->uia_arr[i]->ui_idle; if (ut->ut_idle < entry->idle) entry->idle = ut->ut_idle; } if (!hflag && !iflag && !uflag) { print_entry(entry, lflag && entry->count); for (i = 0, ut = entry->users; i < entry->count; i++, ut++) { free(ut->ut_user); free(ut->ut_line); free(ut->ut_host); } free(entry->users); } return(0); } bool_t rusers_reply_3(char *replyp, struct sockaddr_in *raddrp) { utmp_array *up3 = (utmp_array *)replyp; struct host_info *entry; struct hostent *hp; rusers_utmp *ut; char *host; int i; if (!aflag && up3->utmp_array_len == 0) return(0); hp = gethostbyaddr((char *)&raddrp->sin_addr, sizeof(struct in_addr), AF_INET); if (hp) host = hp->h_name; else host = inet_ntoa(raddrp->sin_addr); if ((entry = add_host(host)) == NULL) return(0); if (up3->utmp_array_len == 0) ut = NULL; else if ((ut = calloc(up3->utmp_array_len, sizeof(*ut))) == NULL) err(1, NULL); entry->users = ut; entry->count = up3->utmp_array_len; entry->idle = UINT_MAX; for (i = 0; i < up3->utmp_array_len; i++, ut++) { ut->ut_user = estrndup(up3->utmp_array_val[i].ut_user, RUSERS_MAXUSERLEN); ut->ut_line = estrndup(up3->utmp_array_val[i].ut_line, RUSERS_MAXLINELEN); ut->ut_host = estrndup(up3->utmp_array_val[i].ut_host, RUSERS_MAXHOSTLEN); ut->ut_time = up3->utmp_array_val[i].ut_time; ut->ut_idle = up3->utmp_array_val[i].ut_idle; if (ut->ut_idle < entry->idle) entry->idle = ut->ut_idle; } if (!hflag && !iflag && !uflag) { print_entry(entry, lflag && entry->count); for (i = 0, ut = entry->users; i < entry->count; i++, ut++) { free(ut->ut_user); free(ut->ut_line); free(ut->ut_host); } free(entry->users); } return(0); } void onehost(char *host) { utmpidlearr up; utmp_array up3; CLIENT *rusers_clnt; struct sockaddr_in sin; struct hostent *hp; struct timeval tv = { 25, 0 }; int error; memset(&sin, 0, sizeof sin); hp = gethostbyname(host); if (hp == NULL) errx(1, "unknown host \"%s\"", host); /* Try version 3 first. */ rusers_clnt = clnt_create(host, RUSERSPROG, RUSERSVERS_3, "udp"); if (rusers_clnt == NULL) { clnt_pcreateerror(__progname); exit(1); } memset(&up3, 0, sizeof(up3)); error = clnt_call(rusers_clnt, RUSERSPROC_NAMES, xdr_void, NULL, xdr_utmp_array, &up3, tv); switch (error) { case RPC_SUCCESS: sin.sin_addr.s_addr = *(int *)hp->h_addr; rusers_reply_3((char *)&up3, &sin); clnt_destroy(rusers_clnt); return; case RPC_PROGVERSMISMATCH: clnt_destroy(rusers_clnt); break; default: clnt_perror(rusers_clnt, __progname); clnt_destroy(rusers_clnt); exit(1); } /* Fall back to version 2. */ rusers_clnt = clnt_create(host, RUSERSPROG, RUSERSVERS_IDLE, "udp"); if (rusers_clnt == NULL) { clnt_pcreateerror(__progname); exit(1); } memset(&up, 0, sizeof(up)); error = clnt_call(rusers_clnt, RUSERSPROC_NAMES, xdr_void, NULL, xdr_utmpidlearr, &up, tv); if (error != RPC_SUCCESS) { clnt_perror(rusers_clnt, __progname); clnt_destroy(rusers_clnt); exit(1); } sin.sin_addr.s_addr = *(int *)hp->h_addr; rusers_reply((char *)&up, &sin); clnt_destroy(rusers_clnt); } enum clnt_stat get_reply(int sock, in_port_t port, u_long xid, struct rpc_msg *msgp, struct rmtcallres *resp, bool_t (*callback)(char *, struct sockaddr_in *)) { ssize_t inlen; socklen_t fromlen; struct sockaddr_in raddr; char inbuf[UDPMSGSIZE]; XDR xdr; retry: msgp->acpted_rply.ar_verf = _null_auth; msgp->acpted_rply.ar_results.where = (caddr_t)resp; msgp->acpted_rply.ar_results.proc = xdr_rmtcallres; fromlen = sizeof(struct sockaddr); inlen = recvfrom(sock, inbuf, sizeof(inbuf), 0, (struct sockaddr *)&raddr, &fromlen); if (inlen < 0) { if (errno == EINTR) goto retry; return (RPC_CANTRECV); } if (inlen < sizeof(u_int32_t)) goto retry; /* * If the reply we got matches our request, decode the * replay and pass it to the callback function. */ xdrmem_create(&xdr, inbuf, (u_int)inlen, XDR_DECODE); if (xdr_replymsg(&xdr, msgp)) { if ((msgp->rm_xid == xid) && (msgp->rm_reply.rp_stat == MSG_ACCEPTED) && (msgp->acpted_rply.ar_stat == SUCCESS)) { raddr.sin_port = htons(port); (void)(*callback)(resp->results_ptr, &raddr); } } xdr.x_op = XDR_FREE; msgp->acpted_rply.ar_results.proc = xdr_void; (void)xdr_replymsg(&xdr, msgp); (void)(*resp->xdr_results)(&xdr, resp->results_ptr); xdr_destroy(&xdr); return(RPC_SUCCESS); } enum clnt_stat rpc_setup(int *fdp, XDR *xdr, struct rpc_msg *msg, struct rmtcallargs *args, AUTH *unix_auth, char *buf) { int on = 1; if ((*fdp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) return(RPC_CANTSEND); if (setsockopt(*fdp, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) return(RPC_CANTSEND); msg->rm_xid = arc4random(); msg->rm_direction = CALL; msg->rm_call.cb_rpcvers = RPC_MSG_VERSION; msg->rm_call.cb_prog = PMAPPROG; msg->rm_call.cb_vers = PMAPVERS; msg->rm_call.cb_proc = PMAPPROC_CALLIT; msg->rm_call.cb_cred = unix_auth->ah_cred; msg->rm_call.cb_verf = unix_auth->ah_verf; xdrmem_create(xdr, buf, MAX_BROADCAST_SIZE, XDR_ENCODE); if (!xdr_callmsg(xdr, msg) || !xdr_rmtcall_args(xdr, args)) return(RPC_CANTENCODEARGS); return(RPC_SUCCESS); } void allhosts(void) { enum clnt_stat stat; struct itimerval timeout; AUTH *unix_auth; size_t outlen[2]; int sock[2] = { -1, -1 }; int i, maxfd, rval; u_long xid[2], port[2]; fd_set *fds = NULL; struct sockaddr_in *sin, baddr; struct rmtcallargs args; struct rmtcallres res[2]; struct rpc_msg msg[2]; struct ifaddrs *ifa, *ifap = NULL; char buf[2][MAX_BROADCAST_SIZE]; utmpidlearr up; utmp_array up3; XDR xdr; if ((unix_auth = authunix_create_default()) == NULL) err(1, "can't create auth handle"); if (getifaddrs(&ifap) != 0) err(1, "can't get list of interface addresses"); memset(&up, 0, sizeof(up)); memset(&up3, 0, sizeof(up3)); memset(&baddr, 0, sizeof(baddr)); memset(&res, 0, sizeof(res)); memset(&msg, 0, sizeof(msg)); memset(&timeout, 0, sizeof(timeout)); args.prog = RUSERSPROG; args.vers = RUSERSVERS_IDLE; args.proc = RUSERSPROC_NAMES; args.xdr_args = xdr_void; args.args_ptr = NULL; stat = rpc_setup(&sock[0], &xdr, &msg[0], &args, unix_auth, buf[0]); if (stat != RPC_SUCCESS) goto cleanup; xid[0] = msg[0].rm_xid; outlen[0] = xdr_getpos(&xdr); xdr_destroy(&xdr); args.vers = RUSERSVERS_3; stat = rpc_setup(&sock[1], &xdr, &msg[1], &args, unix_auth, buf[1]); if (stat != RPC_SUCCESS) goto cleanup; xid[1] = msg[1].rm_xid; outlen[1] = xdr_getpos(&xdr); xdr_destroy(&xdr); maxfd = MAX(sock[0], sock[1]) + 1; fds = (fd_set *)calloc(howmany(maxfd, NFDBITS), sizeof(fd_mask)); if (fds == NULL) err(1, NULL); baddr.sin_len = sizeof(struct sockaddr_in); baddr.sin_family = AF_INET; baddr.sin_port = htons(PMAPPORT); baddr.sin_addr.s_addr = htonl(INADDR_ANY); res[0].port_ptr = &port[0]; res[0].xdr_results = xdr_utmpidlearr; res[0].results_ptr = (caddr_t)&up; res[1].port_ptr = &port[1]; res[1].xdr_results = xdr_utmp_array; res[1].results_ptr = (caddr_t)&up3; (void)signal(SIGALRM, alarmclock); /* * We do 6 runs through the loop. On even runs we send * a version 3 broadcast. On odd ones we send a version 2 * broadcast. This should give version 3 replies enough * of an 'edge' over the old version 2 ones in most cases. * We select() waiting for replies for 5 seconds in between * each broadcast. */ for (i = 0; i < 6; i++) { for (ifa = ifap; ifa; ifa = ifa->ifa_next) { if (ifa->ifa_addr->sa_family != AF_INET || !(ifa->ifa_flags & IFF_BROADCAST) || !(ifa->ifa_flags & IFF_UP) || ifa->ifa_broadaddr == NULL || ifa->ifa_broadaddr->sa_family != AF_INET) continue; sin = (struct sockaddr_in *)ifa->ifa_broadaddr; baddr.sin_addr = sin->sin_addr; /* use protocol 2 or 3 depending on i (odd or even) */ if (i & 1) { if (sendto(sock[0], buf[0], outlen[0], 0, (struct sockaddr *)&baddr, sizeof(struct sockaddr)) != outlen[0]) err(1, "can't send broadcast packet"); } else { if (sendto(sock[1], buf[1], outlen[1], 0, (struct sockaddr *)&baddr, sizeof(struct sockaddr)) != outlen[1]) err(1, "can't send broadcast packet"); } } /* * We stay in the select loop for ~5 seconds */ timeout.it_value.tv_sec = 5; timeout.it_value.tv_usec = 0; while (timerisset(&timeout.it_value)) { FD_SET(sock[0], fds); FD_SET(sock[1], fds); setitimer(ITIMER_REAL, &timeout, NULL); rval = select(maxfd, fds, NULL, NULL, NULL); setitimer(ITIMER_REAL, NULL, &timeout); if (rval == -1) { if (errno == EINTR) break; err(1, "select"); /* shouldn't happen */ } if (FD_ISSET(sock[1], fds)) { stat = get_reply(sock[1], (in_port_t)port[1], xid[1], &msg[1], &res[1], rusers_reply_3); if (stat != RPC_SUCCESS) goto cleanup; } if (FD_ISSET(sock[0], fds)) { stat = get_reply(sock[0], (in_port_t)port[0], xid[0], &msg[0], &res[0], rusers_reply); if (stat != RPC_SUCCESS) goto cleanup; } } } cleanup: if (ifap != NULL) freeifaddrs(ifap); if (fds != NULL) free(fds); if (sock[0] >= 0) (void)close(sock[0]); if (sock[1] >= 0) (void)close(sock[1]); AUTH_DESTROY(unix_auth); if (stat != RPC_SUCCESS) { clnt_perrno(stat); exit(1); } } void print_entry(struct host_info *entry, int longfmt) { char date[32], idle_time[64]; char remote[RUSERS_MAXHOSTLEN + 3]; struct rusers_utmp *ut; int i, len; if (!longfmt) printf("%-*.*s ", HOST_WIDTH, HOST_WIDTH, entry->host); for (i = 0, ut = entry->users; i < entry->count; i++, ut++) { if (longfmt) { strftime(date, sizeof(date), "%h %d %R", localtime((time_t *)&ut->ut_time)); date[sizeof(date) - 1] = '\0'; fmt_idle(ut->ut_idle, idle_time, sizeof(idle_time)); len = termwidth - (MAX(strlen(ut->ut_user), NAME_WIDTH) + 1 + HOST_WIDTH + 1 + LINE_WIDTH + 1 + strlen(date) + 1 + MAX(8, strlen(idle_time)) + 1 + 2); if (len > 0 && ut->ut_host[0] != '\0') snprintf(remote, sizeof(remote), "(%.*s)", MIN(len, RUSERS_MAXHOSTLEN), ut->ut_host); else remote[0] = '\0'; len = HOST_WIDTH - MIN(HOST_WIDTH, strlen(entry->host)) + LINE_WIDTH - MIN(LINE_WIDTH, strlen(ut->ut_line)); printf("%-*s %.*s:%.*s%-*s %-12s %8s %s\n", NAME_WIDTH, ut->ut_user, HOST_WIDTH, entry->host, LINE_WIDTH, ut->ut_line, len, "", date, idle_time, remote); } else { fputs(ut->ut_user, stdout); putchar(' '); } } if (!longfmt) putchar('\n'); } void expandhosts(void) { struct host_info *new_hostinfo, *entry; u_int count; int i, j; for (i = 0, count = 0; i < nentries; i++) count += hostinfo[i].count; new_hostinfo = (struct host_info *)calloc(sizeof(*entry), count); if (new_hostinfo == NULL) err(1, NULL); for (i = 0, entry = new_hostinfo; i < nentries; i++) { for (j = 0; j < hostinfo[i].count; j++) { memcpy(entry, &hostinfo[i], sizeof(*entry)); entry->users = &hostinfo[i].users[j]; entry->idle = entry->users->ut_idle; entry->count = 1; entry++; } } free(hostinfo); hostinfo = new_hostinfo; nentries = maxentries = count; } void sorthosts(void) { int i; int (*compar)(const void *, const void *); if (iflag && lflag) expandhosts(); if (hflag) compar = hcompare; else if (iflag) compar = icompare; else compar = ucompare; qsort(hostinfo, nentries, sizeof(*hostinfo), compar); for (i = 0; i < nentries; i++) print_entry(&hostinfo[i], lflag && hostinfo[i].count); } int hcompare(const void *aa, const void *bb) { const struct host_info *a = (struct host_info *)aa; const struct host_info *b = (struct host_info *)bb; int rval; if ((rval = strcasecmp(a->host, b->host)) != 0) return(rval); if (a->idle < b->idle) return(-1); else if (a->idle > b->idle) return(1); if (a->count > b->count) return(-1); else if (a->count < b->count) return(1); return(0); } int icompare(const void *aa, const void *bb) { const struct host_info *a = (struct host_info *)aa; const struct host_info *b = (struct host_info *)bb; if (a->idle < b->idle) return(-1); else if (a->idle > b->idle) return(1); if (a->count > b->count) return(-1); else if (a->count < b->count) return(1); return(strcasecmp(a->host, b->host)); } int ucompare(const void *aa, const void *bb) { const struct host_info *a = (struct host_info *)aa; const struct host_info *b = (struct host_info *)bb; if (a->count > b->count) return(-1); else if (a->count < b->count) return(1); if (a->idle < b->idle) return(-1); else if (a->idle > b->idle) return(1); return(strcasecmp(a->host, b->host)); } void alarmclock(int signo) { ; /* just interrupt */ } char * estrndup(const char *src, size_t len) { char *dst, *end; if ((end = memchr(src, '\0', len)) != NULL) len = end - src; if ((dst = malloc(len + 1)) == NULL) err(1, NULL); memcpy(dst, src, len); dst[len] = '\0'; return(dst); } void usage(void) { fprintf(stderr, "usage: %s [-al] [-h | -i | -u] [hosts ...]\n", __progname); exit(1); }