Annotation of src/usr.bin/wall/wall.c, Revision 1.24
1.24 ! bluhm 1: /* $OpenBSD: wall.c,v 1.23 2009/08/03 20:22:39 bluhm 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: #ifndef lint
1.15 millert 34: static const char copyright[] =
1.1 deraadt 35: "@(#) Copyright (c) 1988, 1990, 1993\n\
36: The Regents of the University of California. All rights reserved.\n";
37: #endif /* not lint */
38:
39: #ifndef lint
40: #if 0
1.15 millert 41: static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
1.1 deraadt 42: #endif
1.24 ! bluhm 43: static const char rcsid[] = "$OpenBSD: wall.c,v 1.23 2009/08/03 20:22:39 bluhm Exp $";
1.1 deraadt 44: #endif /* not lint */
45:
46: /*
47: * This program is not related to David Wall, whose Stanford Ph.D. thesis
48: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
49: */
50:
51: #include <sys/param.h>
52: #include <sys/stat.h>
53: #include <sys/time.h>
54: #include <sys/uio.h>
55:
56: #include <paths.h>
57: #include <pwd.h>
1.6 deraadt 58: #include <grp.h>
1.1 deraadt 59: #include <stdio.h>
60: #include <stdlib.h>
61: #include <string.h>
62: #include <unistd.h>
63: #include <utmp.h>
1.4 deraadt 64: #include <vis.h>
1.9 form 65: #include <err.h>
1.1 deraadt 66:
1.6 deraadt 67: struct wallgroup {
1.15 millert 68: gid_t gid;
69: char *name;
70: char **mem;
1.6 deraadt 71: struct wallgroup *next;
72: } *grouplist;
73:
1.15 millert 74: void makemsg(char *);
75: void addgroup(struct group *, char *);
76: char *ttymsg(struct iovec *, int, char *, int);
77: __dead void usage(void);
1.1 deraadt 78:
79: int nobanner;
80: int mbufsize;
81: char *mbuf;
82:
83: /* ARGSUSED */
84: int
1.15 millert 85: main(int argc, char **argv)
1.1 deraadt 86: {
1.15 millert 87: FILE *fp;
88: int ch, ingroup;
1.1 deraadt 89: struct iovec iov;
90: struct utmp utmp;
1.15 millert 91: char *p, **mem;
1.1 deraadt 92: char line[sizeof(utmp.ut_line) + 1];
1.15 millert 93: char username[sizeof(utmp.ut_name) + 1];
94: struct passwd *pw;
95: struct group *grp;
1.6 deraadt 96: struct wallgroup *g;
1.1 deraadt 97:
1.8 millert 98: while ((ch = getopt(argc, argv, "ng:")) != -1)
1.1 deraadt 99: switch (ch) {
100: case 'n':
101: /* undoc option for shutdown: suppress banner */
1.15 millert 102: pw = getpwnam("nobody");
103: if (geteuid() == 0 || (pw && getuid() == pw->pw_uid))
1.1 deraadt 104: nobanner = 1;
105: break;
1.6 deraadt 106: case 'g':
1.15 millert 107: if ((grp = getgrnam(optarg)) == NULL)
108: errx(1, "unknown group `%s'", optarg);
109: addgroup(grp, optarg);
1.6 deraadt 110: break;
1.1 deraadt 111: default:
1.15 millert 112: usage();
1.1 deraadt 113: }
114: argc -= optind;
115: argv += optind;
116: if (argc > 1)
1.15 millert 117: usage();
1.6 deraadt 118:
1.1 deraadt 119: makemsg(*argv);
120:
1.9 form 121: if (!(fp = fopen(_PATH_UTMP, "r")))
1.21 henning 122: err(1, "cannot read %s", _PATH_UTMP);
1.1 deraadt 123: iov.iov_base = mbuf;
124: iov.iov_len = mbufsize;
125: /* NOSTRICT */
1.15 millert 126: while (fread(&utmp, sizeof(utmp), 1, fp) == 1) {
1.16 deraadt 127: if (!utmp.ut_name[0])
1.1 deraadt 128: continue;
1.6 deraadt 129: if (grouplist) {
1.15 millert 130: ingroup = 0;
131: strncpy(username, utmp.ut_name, sizeof(utmp.ut_name));
132: username[sizeof(utmp.ut_name)] = '\0';
1.6 deraadt 133: pw = getpwnam(username);
134: if (!pw)
135: continue;
136: for (g = grouplist; g && ingroup == 0; g = g->next) {
137: if (g->gid == pw->pw_gid)
138: ingroup = 1;
1.15 millert 139: for (mem = g->mem; *mem && ingroup == 0; mem++)
140: if (strcmp(username, *mem) == 0)
1.6 deraadt 141: ingroup = 1;
142: }
143: if (ingroup == 0)
144: continue;
145: }
1.1 deraadt 146: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
147: line[sizeof(utmp.ut_line)] = '\0';
148: if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
1.13 deraadt 149: warnx("%s", p);
1.1 deraadt 150: }
151: exit(0);
152: }
153:
154: void
1.15 millert 155: makemsg(char *fname)
1.1 deraadt 156: {
1.15 millert 157: int ch, cnt;
1.1 deraadt 158: struct tm *lt;
159: struct passwd *pw;
160: struct stat sbuf;
1.19 deraadt 161: time_t now;
1.1 deraadt 162: FILE *fp;
163: int fd;
1.17 deraadt 164: char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
1.4 deraadt 165: char tmpbuf[5];
1.11 d 166: char *ttynam;
1.1 deraadt 167:
1.20 avsm 168: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
1.15 millert 169: if ((fd = mkstemp(tmpname)) >= 0) {
170: (void)unlink(tmpname);
171: fp = fdopen(fd, "r+");
172: }
173: if (fd == -1 || fp == NULL)
1.21 henning 174: err(1, "can't open temporary file");
1.1 deraadt 175:
176: if (!nobanner) {
177: if (!(whom = getlogin()))
178: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
179: (void)gethostname(hostname, sizeof(hostname));
180: (void)time(&now);
181: lt = localtime(&now);
1.11 d 182: if ((ttynam = ttyname(STDERR_FILENO)) == NULL)
183: ttynam = "(not a tty)";
1.1 deraadt 184:
185: /*
186: * all this stuff is to blank out a square for the message;
187: * we wrap message lines at column 79, not 80, because some
188: * terminals wrap after 79, some do not, and we can't tell.
189: * Which means that we may leave a non-blank character
190: * in column 80, but that can't be helped.
191: */
192: (void)fprintf(fp, "\r%79s\r\n", " ");
1.3 deraadt 193: (void)snprintf(lbuf, sizeof lbuf,
194: "Broadcast Message from %s@%s", whom, hostname);
1.1 deraadt 195: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
1.3 deraadt 196: (void)snprintf(lbuf, sizeof lbuf,
1.11 d 197: " (%s) at %d:%02d ...", ttynam,
1.1 deraadt 198: lt->tm_hour, lt->tm_min);
199: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
200: }
201: (void)fprintf(fp, "%79s\r\n", " ");
202:
1.13 deraadt 203: if (fname) {
204: gid_t egid = getegid();
205:
206: setegid(getgid());
207: if (freopen(fname, "r", stdin) == NULL)
1.21 henning 208: err(1, "can't read %s", fname);
1.13 deraadt 209: setegid(egid);
210: }
1.1 deraadt 211: while (fgets(lbuf, sizeof(lbuf), stdin))
212: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
1.5 deraadt 213: vis(tmpbuf, ch, VIS_SAFE|VIS_NOSLASH, p[1]);
1.4 deraadt 214: if (cnt == 79+1-strlen(tmpbuf) || ch == '\n') {
215: for (; cnt < 79+1-strlen(tmpbuf); ++cnt)
1.1 deraadt 216: putc(' ', fp);
217: putc('\r', fp);
218: putc('\n', fp);
219: cnt = -1;
220: }
1.4 deraadt 221: if (ch != '\n') {
222: int xx;
223:
224: for (xx = 0; tmpbuf[xx]; xx++)
225: putc(tmpbuf[xx], fp);
226: }
1.1 deraadt 227: }
228: (void)fprintf(fp, "%79s\r\n", " ");
229: rewind(fp);
230:
1.9 form 231: if (fstat(fd, &sbuf))
1.21 henning 232: err(1, "can't stat temporary file");
1.1 deraadt 233: mbufsize = sbuf.st_size;
1.22 tom 234: mbuf = malloc((u_int)mbufsize);
235: if (mbuf == NULL)
236: err(1, NULL);
1.9 form 237: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
1.21 henning 238: err(1, "can't read temporary file");
1.1 deraadt 239: (void)close(fd);
1.15 millert 240: }
241:
242: void
243: addgroup(struct group *grp, char *name)
244: {
245: int i;
246: struct wallgroup *g;
247:
248: for (i = 0; grp->gr_mem[i]; i++)
249: ;
250:
251: g = (struct wallgroup *)malloc(sizeof *g);
252: if (g == NULL)
1.22 tom 253: err(1, NULL);
1.15 millert 254: g->gid = grp->gr_gid;
255: g->name = name;
1.23 bluhm 256: g->mem = (char **)calloc(i + 1, sizeof(char *));
1.15 millert 257: if (g->mem == NULL)
1.22 tom 258: err(1, NULL);
1.15 millert 259: for (i = 0; grp->gr_mem[i] != NULL; i++) {
260: g->mem[i] = strdup(grp->gr_mem[i]);
261: if (g->mem[i] == NULL)
1.22 tom 262: err(1, NULL);
1.15 millert 263: }
264: g->mem[i] = NULL;
265: g->next = grouplist;
266: grouplist = g;
267: }
268:
269: void
270: usage(void)
271: {
272: extern char *__progname;
273:
274: (void)fprintf(stderr, "usage: %s [-g group] [file]\n", __progname);
275: exit(1);
1.1 deraadt 276: }
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