Annotation of src/usr.bin/wall/wall.c, Revision 1.17
1.17 ! deraadt 1: /* $OpenBSD: wall.c,v 1.16 2001/09/06 14:21:47 deraadt 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.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.15 millert 38: static const char copyright[] =
1.1 deraadt 39: "@(#) Copyright (c) 1988, 1990, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
1.15 millert 45: static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
1.1 deraadt 46: #endif
1.17 ! deraadt 47: static const char rcsid[] = "$OpenBSD: wall.c,v 1.16 2001/09/06 14:21:47 deraadt Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: /*
51: * This program is not related to David Wall, whose Stanford Ph.D. thesis
52: * is entitled "Mechanisms for Broadcast and Selective Broadcast".
53: */
54:
55: #include <sys/param.h>
56: #include <sys/stat.h>
57: #include <sys/time.h>
58: #include <sys/uio.h>
59:
60: #include <paths.h>
61: #include <pwd.h>
1.6 deraadt 62: #include <grp.h>
1.1 deraadt 63: #include <stdio.h>
64: #include <stdlib.h>
65: #include <string.h>
66: #include <unistd.h>
67: #include <utmp.h>
1.4 deraadt 68: #include <vis.h>
1.9 form 69: #include <err.h>
1.1 deraadt 70:
1.6 deraadt 71: struct wallgroup {
1.15 millert 72: gid_t gid;
73: char *name;
74: char **mem;
1.6 deraadt 75: struct wallgroup *next;
76: } *grouplist;
77:
1.15 millert 78: void makemsg(char *);
79: void addgroup(struct group *, char *);
80: char *ttymsg(struct iovec *, int, char *, int);
81: __dead void usage(void);
1.1 deraadt 82:
83: int nobanner;
84: int mbufsize;
85: char *mbuf;
86:
87: /* ARGSUSED */
88: int
1.15 millert 89: main(int argc, char **argv)
1.1 deraadt 90: {
1.15 millert 91: FILE *fp;
92: int ch, ingroup;
1.1 deraadt 93: struct iovec iov;
94: struct utmp utmp;
1.15 millert 95: char *p, **mem;
1.1 deraadt 96: char line[sizeof(utmp.ut_line) + 1];
1.15 millert 97: char username[sizeof(utmp.ut_name) + 1];
98: struct passwd *pw;
99: struct group *grp;
1.6 deraadt 100: struct wallgroup *g;
1.1 deraadt 101:
1.8 millert 102: while ((ch = getopt(argc, argv, "ng:")) != -1)
1.1 deraadt 103: switch (ch) {
104: case 'n':
105: /* undoc option for shutdown: suppress banner */
1.15 millert 106: pw = getpwnam("nobody");
107: if (geteuid() == 0 || (pw && getuid() == pw->pw_uid))
1.1 deraadt 108: nobanner = 1;
109: break;
1.6 deraadt 110: case 'g':
1.15 millert 111: grp = getgrnam(optarg);
112: if ((grp = getgrnam(optarg)) == NULL)
113: errx(1, "unknown group `%s'", optarg);
114: addgroup(grp, optarg);
1.6 deraadt 115: break;
1.1 deraadt 116: default:
1.15 millert 117: usage();
1.1 deraadt 118: }
119: argc -= optind;
120: argv += optind;
121: if (argc > 1)
1.15 millert 122: usage();
1.6 deraadt 123:
1.1 deraadt 124: makemsg(*argv);
125:
1.9 form 126: if (!(fp = fopen(_PATH_UTMP, "r")))
1.13 deraadt 127: errx(1, "cannot read %s.", _PATH_UTMP);
1.1 deraadt 128: iov.iov_base = mbuf;
129: iov.iov_len = mbufsize;
130: /* NOSTRICT */
1.15 millert 131: while (fread(&utmp, sizeof(utmp), 1, fp) == 1) {
1.16 deraadt 132: if (!utmp.ut_name[0])
1.1 deraadt 133: continue;
1.6 deraadt 134: if (grouplist) {
1.15 millert 135: ingroup = 0;
136: strncpy(username, utmp.ut_name, sizeof(utmp.ut_name));
137: username[sizeof(utmp.ut_name)] = '\0';
1.6 deraadt 138: pw = getpwnam(username);
139: if (!pw)
140: continue;
141: for (g = grouplist; g && ingroup == 0; g = g->next) {
142: if (g->gid == pw->pw_gid)
143: ingroup = 1;
1.15 millert 144: for (mem = g->mem; *mem && ingroup == 0; mem++)
145: if (strcmp(username, *mem) == 0)
1.6 deraadt 146: ingroup = 1;
147: }
148: if (ingroup == 0)
149: continue;
150: }
1.1 deraadt 151: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
152: line[sizeof(utmp.ut_line)] = '\0';
153: if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
1.13 deraadt 154: warnx("%s", p);
1.1 deraadt 155: }
156: exit(0);
157: }
158:
159: void
1.15 millert 160: makemsg(char *fname)
1.1 deraadt 161: {
1.15 millert 162: int ch, cnt;
1.1 deraadt 163: struct tm *lt;
164: struct passwd *pw;
165: struct stat sbuf;
166: time_t now, time();
167: FILE *fp;
168: int fd;
1.17 ! deraadt 169: char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
1.4 deraadt 170: char tmpbuf[5];
1.11 d 171: char *ttynam;
1.1 deraadt 172:
1.10 deraadt 173: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
1.15 millert 174: if ((fd = mkstemp(tmpname)) >= 0) {
175: (void)unlink(tmpname);
176: fp = fdopen(fd, "r+");
177: }
178: if (fd == -1 || fp == NULL)
1.13 deraadt 179: errx(1, "can't open temporary file.");
1.1 deraadt 180:
181: if (!nobanner) {
182: if (!(whom = getlogin()))
183: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
184: (void)gethostname(hostname, sizeof(hostname));
185: (void)time(&now);
186: lt = localtime(&now);
1.11 d 187: if ((ttynam = ttyname(STDERR_FILENO)) == NULL)
188: ttynam = "(not a tty)";
1.1 deraadt 189:
190: /*
191: * all this stuff is to blank out a square for the message;
192: * we wrap message lines at column 79, not 80, because some
193: * terminals wrap after 79, some do not, and we can't tell.
194: * Which means that we may leave a non-blank character
195: * in column 80, but that can't be helped.
196: */
197: (void)fprintf(fp, "\r%79s\r\n", " ");
1.3 deraadt 198: (void)snprintf(lbuf, sizeof lbuf,
199: "Broadcast Message from %s@%s", whom, hostname);
1.1 deraadt 200: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
1.3 deraadt 201: (void)snprintf(lbuf, sizeof lbuf,
1.11 d 202: " (%s) at %d:%02d ...", ttynam,
1.1 deraadt 203: lt->tm_hour, lt->tm_min);
204: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
205: }
206: (void)fprintf(fp, "%79s\r\n", " ");
207:
1.13 deraadt 208: if (fname) {
209: gid_t egid = getegid();
210:
211: setegid(getgid());
212: if (freopen(fname, "r", stdin) == NULL)
213: errx(1, "can't read %s.", fname);
214: setegid(egid);
215: }
1.1 deraadt 216: while (fgets(lbuf, sizeof(lbuf), stdin))
217: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
1.5 deraadt 218: vis(tmpbuf, ch, VIS_SAFE|VIS_NOSLASH, p[1]);
1.4 deraadt 219: if (cnt == 79+1-strlen(tmpbuf) || ch == '\n') {
220: for (; cnt < 79+1-strlen(tmpbuf); ++cnt)
1.1 deraadt 221: putc(' ', fp);
222: putc('\r', fp);
223: putc('\n', fp);
224: cnt = -1;
225: }
1.4 deraadt 226: if (ch != '\n') {
227: int xx;
228:
229: for (xx = 0; tmpbuf[xx]; xx++)
230: putc(tmpbuf[xx], fp);
231: }
1.1 deraadt 232: }
233: (void)fprintf(fp, "%79s\r\n", " ");
234: rewind(fp);
235:
1.9 form 236: if (fstat(fd, &sbuf))
1.13 deraadt 237: errx(1, "can't stat temporary file.");
1.1 deraadt 238: mbufsize = sbuf.st_size;
1.9 form 239: if (!(mbuf = malloc((u_int)mbufsize)))
1.13 deraadt 240: errx(1, "out of memory.");
1.9 form 241: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
1.13 deraadt 242: errx(1, "can't read temporary file.");
1.1 deraadt 243: (void)close(fd);
1.15 millert 244: }
245:
246: void
247: addgroup(struct group *grp, char *name)
248: {
249: int i;
250: struct wallgroup *g;
251:
252: for (i = 0; grp->gr_mem[i]; i++)
253: ;
254:
255: g = (struct wallgroup *)malloc(sizeof *g);
256: if (g == NULL)
257: errx(1, "out of memory.");
258: g->gid = grp->gr_gid;
259: g->name = name;
260: g->mem = (char **)malloc(i + 1);
261: if (g->mem == NULL)
262: errx(1, "out of memory.");
263: for (i = 0; grp->gr_mem[i] != NULL; i++) {
264: g->mem[i] = strdup(grp->gr_mem[i]);
265: if (g->mem[i] == NULL)
266: errx(1, "out of memory.");
267: }
268: g->mem[i] = NULL;
269: g->next = grouplist;
270: grouplist = g;
271: }
272:
273: void
274: usage(void)
275: {
276: extern char *__progname;
277:
278: (void)fprintf(stderr, "usage: %s [-g group] [file]\n", __progname);
279: exit(1);
1.1 deraadt 280: }
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