Annotation of src/usr.bin/wall/wall.c, Revision 1.29
1.29 ! benno 1: /* $OpenBSD: wall.c,v 1.28 2015/09/29 03:19:24 guenther Exp $ */
1.1 deraadt 2: /* $NetBSD: wall.c,v 1.6 1994/11/17 07:17:58 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1988, 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.18 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * This program is not related to David Wall, whose Stanford Ph.D. thesis
35: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
36: */
37:
1.29 ! benno 38: #include <sys/queue.h>
1.1 deraadt 39: #include <sys/stat.h>
40: #include <sys/time.h>
41: #include <sys/uio.h>
42:
43: #include <paths.h>
44: #include <pwd.h>
1.6 deraadt 45: #include <grp.h>
1.1 deraadt 46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
49: #include <unistd.h>
1.26 deraadt 50: #include <limits.h>
1.1 deraadt 51: #include <utmp.h>
1.4 deraadt 52: #include <vis.h>
1.9 form 53: #include <err.h>
1.1 deraadt 54:
1.6 deraadt 55: struct wallgroup {
1.15 millert 56: gid_t gid;
57: char *name;
58: char **mem;
1.6 deraadt 59: struct wallgroup *next;
60: } *grouplist;
61:
1.29 ! benno 62: struct utmptty {
! 63: char *tty;
! 64: SLIST_ENTRY(utmptty) next;
! 65: };
! 66:
1.15 millert 67: void makemsg(char *);
68: void addgroup(struct group *, char *);
69: char *ttymsg(struct iovec *, int, char *, int);
70: __dead void usage(void);
1.1 deraadt 71:
72: int nobanner;
73: int mbufsize;
74: char *mbuf;
75:
76: /* ARGSUSED */
77: int
1.15 millert 78: main(int argc, char **argv)
1.1 deraadt 79: {
1.15 millert 80: FILE *fp;
81: int ch, ingroup;
1.1 deraadt 82: struct iovec iov;
83: struct utmp utmp;
1.15 millert 84: char *p, **mem;
1.1 deraadt 85: char line[sizeof(utmp.ut_line) + 1];
1.15 millert 86: char username[sizeof(utmp.ut_name) + 1];
87: struct passwd *pw;
88: struct group *grp;
1.6 deraadt 89: struct wallgroup *g;
1.29 ! benno 90: struct utmptty *un;
! 91: SLIST_HEAD(,utmptty) utmphead;
! 92: SLIST_INIT(&utmphead);
1.1 deraadt 93:
1.8 millert 94: while ((ch = getopt(argc, argv, "ng:")) != -1)
1.1 deraadt 95: switch (ch) {
96: case 'n':
97: /* undoc option for shutdown: suppress banner */
1.15 millert 98: pw = getpwnam("nobody");
99: if (geteuid() == 0 || (pw && getuid() == pw->pw_uid))
1.1 deraadt 100: nobanner = 1;
101: break;
1.6 deraadt 102: case 'g':
1.15 millert 103: if ((grp = getgrnam(optarg)) == NULL)
104: errx(1, "unknown group `%s'", optarg);
105: addgroup(grp, optarg);
1.6 deraadt 106: break;
1.1 deraadt 107: default:
1.15 millert 108: usage();
1.1 deraadt 109: }
110: argc -= optind;
111: argv += optind;
112: if (argc > 1)
1.15 millert 113: usage();
1.6 deraadt 114:
1.1 deraadt 115: makemsg(*argv);
116:
1.29 ! benno 117: if (pledge("stdio rpath wpath getpw proc", NULL) == -1)
! 118: err(1, "pledge");
! 119:
1.9 form 120: if (!(fp = fopen(_PATH_UTMP, "r")))
1.21 henning 121: err(1, "cannot read %s", _PATH_UTMP);
1.1 deraadt 122: iov.iov_base = mbuf;
123: iov.iov_len = mbufsize;
1.29 ! benno 124:
1.15 millert 125: while (fread(&utmp, sizeof(utmp), 1, fp) == 1) {
1.16 deraadt 126: if (!utmp.ut_name[0])
1.1 deraadt 127: continue;
1.6 deraadt 128: if (grouplist) {
1.15 millert 129: ingroup = 0;
130: strncpy(username, utmp.ut_name, sizeof(utmp.ut_name));
131: username[sizeof(utmp.ut_name)] = '\0';
1.6 deraadt 132: pw = getpwnam(username);
133: if (!pw)
134: continue;
135: for (g = grouplist; g && ingroup == 0; g = g->next) {
136: if (g->gid == pw->pw_gid)
137: ingroup = 1;
1.15 millert 138: for (mem = g->mem; *mem && ingroup == 0; mem++)
139: if (strcmp(username, *mem) == 0)
1.6 deraadt 140: ingroup = 1;
141: }
142: if (ingroup == 0)
143: continue;
144: }
1.1 deraadt 145: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
146: line[sizeof(utmp.ut_line)] = '\0';
1.29 ! benno 147: un = malloc(sizeof(struct utmptty));
! 148: if (un == NULL)
! 149: err(1, "malloc");
! 150: un->tty = strndup(line, sizeof(utmp.ut_line));
! 151: if (un->tty == NULL)
! 152: err(1, "strndup");
! 153: SLIST_INSERT_HEAD(&utmphead, un, next);
! 154: }
! 155: fclose(fp);
! 156:
! 157: if (pledge("stdio rpath wpath proc", NULL) == -1)
! 158: err(1, "pledge");
! 159:
! 160: SLIST_FOREACH(un, &utmphead, next) {
! 161: if ((p = ttymsg(&iov, 1, un->tty, 60*5)) != NULL)
1.13 deraadt 162: warnx("%s", p);
1.1 deraadt 163: }
1.29 ! benno 164:
1.1 deraadt 165: exit(0);
166: }
167:
168: void
1.15 millert 169: makemsg(char *fname)
1.1 deraadt 170: {
1.15 millert 171: int ch, cnt;
1.1 deraadt 172: struct tm *lt;
173: struct passwd *pw;
174: struct stat sbuf;
1.19 deraadt 175: time_t now;
1.1 deraadt 176: FILE *fp;
177: int fd;
1.26 deraadt 178: char *p, *whom, hostname[HOST_NAME_MAX+1], lbuf[100], tmpname[PATH_MAX];
1.4 deraadt 179: char tmpbuf[5];
1.11 d 180: char *ttynam;
1.1 deraadt 181:
1.20 avsm 182: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
1.15 millert 183: if ((fd = mkstemp(tmpname)) >= 0) {
184: (void)unlink(tmpname);
185: fp = fdopen(fd, "r+");
186: }
187: if (fd == -1 || fp == NULL)
1.21 henning 188: err(1, "can't open temporary file");
1.1 deraadt 189:
190: if (!nobanner) {
191: if (!(whom = getlogin()))
192: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
193: (void)gethostname(hostname, sizeof(hostname));
194: (void)time(&now);
195: lt = localtime(&now);
1.11 d 196: if ((ttynam = ttyname(STDERR_FILENO)) == NULL)
197: ttynam = "(not a tty)";
1.1 deraadt 198:
199: /*
200: * all this stuff is to blank out a square for the message;
201: * we wrap message lines at column 79, not 80, because some
202: * terminals wrap after 79, some do not, and we can't tell.
203: * Which means that we may leave a non-blank character
204: * in column 80, but that can't be helped.
205: */
206: (void)fprintf(fp, "\r%79s\r\n", " ");
1.3 deraadt 207: (void)snprintf(lbuf, sizeof lbuf,
208: "Broadcast Message from %s@%s", whom, hostname);
1.1 deraadt 209: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
1.3 deraadt 210: (void)snprintf(lbuf, sizeof lbuf,
1.11 d 211: " (%s) at %d:%02d ...", ttynam,
1.1 deraadt 212: lt->tm_hour, lt->tm_min);
213: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
214: }
215: (void)fprintf(fp, "%79s\r\n", " ");
216:
1.13 deraadt 217: if (fname) {
218: gid_t egid = getegid();
219:
220: setegid(getgid());
221: if (freopen(fname, "r", stdin) == NULL)
1.21 henning 222: err(1, "can't read %s", fname);
1.13 deraadt 223: setegid(egid);
224: }
1.1 deraadt 225: while (fgets(lbuf, sizeof(lbuf), stdin))
226: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
1.5 deraadt 227: vis(tmpbuf, ch, VIS_SAFE|VIS_NOSLASH, p[1]);
1.4 deraadt 228: if (cnt == 79+1-strlen(tmpbuf) || ch == '\n') {
229: for (; cnt < 79+1-strlen(tmpbuf); ++cnt)
1.1 deraadt 230: putc(' ', fp);
231: putc('\r', fp);
232: putc('\n', fp);
233: cnt = -1;
234: }
1.4 deraadt 235: if (ch != '\n') {
236: int xx;
237:
238: for (xx = 0; tmpbuf[xx]; xx++)
239: putc(tmpbuf[xx], fp);
240: }
1.1 deraadt 241: }
242: (void)fprintf(fp, "%79s\r\n", " ");
243: rewind(fp);
244:
1.9 form 245: if (fstat(fd, &sbuf))
1.21 henning 246: err(1, "can't stat temporary file");
1.1 deraadt 247: mbufsize = sbuf.st_size;
1.22 tom 248: mbuf = malloc((u_int)mbufsize);
249: if (mbuf == NULL)
250: err(1, NULL);
1.9 form 251: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
1.21 henning 252: err(1, "can't read temporary file");
1.1 deraadt 253: (void)close(fd);
1.15 millert 254: }
255:
256: void
257: addgroup(struct group *grp, char *name)
258: {
259: int i;
260: struct wallgroup *g;
261:
262: for (i = 0; grp->gr_mem[i]; i++)
263: ;
264:
1.27 deraadt 265: g = malloc(sizeof *g);
1.15 millert 266: if (g == NULL)
1.22 tom 267: err(1, NULL);
1.15 millert 268: g->gid = grp->gr_gid;
269: g->name = name;
1.27 deraadt 270: g->mem = calloc(i + 1, sizeof(char *));
1.15 millert 271: if (g->mem == NULL)
1.22 tom 272: err(1, NULL);
1.15 millert 273: for (i = 0; grp->gr_mem[i] != NULL; i++) {
274: g->mem[i] = strdup(grp->gr_mem[i]);
275: if (g->mem[i] == NULL)
1.22 tom 276: err(1, NULL);
1.15 millert 277: }
278: g->mem[i] = NULL;
279: g->next = grouplist;
280: grouplist = g;
281: }
282:
283: void
284: usage(void)
285: {
286: extern char *__progname;
287:
288: (void)fprintf(stderr, "usage: %s [-g group] [file]\n", __progname);
289: exit(1);
1.1 deraadt 290: }
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