Annotation of src/usr.bin/wall/wall.c, Revision 1.14
1.14 ! deraadt 1: /* $OpenBSD: wall.c,v 1.13 2000/09/07 17:23:26 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
38: static char copyright[] =
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
45: static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
46: #endif
1.14 ! deraadt 47: static char rcsid[] = "$OpenBSD: wall.c,v 1.13 2000/09/07 17:23:26 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 {
72: struct wallgroup *next;
73: char *name;
74: gid_t gid;
75: } *grouplist;
76:
1.1 deraadt 77: void makemsg __P((char *));
78:
79: #define IGNOREUSER "sleeper"
80:
81: int nobanner;
82: int mbufsize;
83: char *mbuf;
84:
85: /* ARGSUSED */
86: int
87: main(argc, argv)
88: int argc;
89: char **argv;
90: {
91: extern int optind;
92: int ch;
93: struct iovec iov;
94: struct utmp utmp;
95: FILE *fp;
96: char *p, *ttymsg();
97: struct passwd *pep = getpwnam("nobody");
98: char line[sizeof(utmp.ut_line) + 1];
1.6 deraadt 99: struct wallgroup *g;
1.1 deraadt 100:
1.8 millert 101: while ((ch = getopt(argc, argv, "ng:")) != -1)
1.1 deraadt 102: switch (ch) {
103: case 'n':
104: /* undoc option for shutdown: suppress banner */
105: if (geteuid() == 0 || (pep && getuid() == pep->pw_uid))
106: nobanner = 1;
107: break;
1.6 deraadt 108: case 'g':
109: g = (struct wallgroup *)malloc(sizeof *g);
110: g->next = grouplist;
111: g->name = optarg;
112: g->gid = -1;
113: grouplist = g;
114: break;
1.1 deraadt 115: case '?':
116: default:
117: usage:
1.6 deraadt 118: (void)fprintf(stderr, "usage: wall [-g group] [file]\n");
1.1 deraadt 119: exit(1);
120: }
121: argc -= optind;
122: argv += optind;
123: if (argc > 1)
124: goto usage;
125:
1.6 deraadt 126: for (g = grouplist; g; g = g->next) {
127: struct group *grp;
128:
129: grp = getgrnam(g->name);
130: if (grp)
131: g->gid = grp->gr_gid;
132: }
133:
1.1 deraadt 134: makemsg(*argv);
135:
1.9 form 136: if (!(fp = fopen(_PATH_UTMP, "r")))
1.13 deraadt 137: errx(1, "cannot read %s.", _PATH_UTMP);
1.1 deraadt 138: iov.iov_base = mbuf;
139: iov.iov_len = mbufsize;
140: /* NOSTRICT */
141: while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
142: if (!utmp.ut_name[0] ||
143: !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
144: continue;
1.6 deraadt 145: if (grouplist) {
146: int ingroup = 0, ngrps, i;
1.14 ! deraadt 147: char username[MAXLOGNAME];
1.6 deraadt 148: struct passwd *pw;
149: gid_t grps[NGROUPS_MAX];
150:
151: bzero(username, sizeof username);
152: strncpy(username, utmp.ut_name, sizeof utmp.ut_name);
153: pw = getpwnam(username);
154: if (!pw)
155: continue;
156: ngrps = getgroups(pw->pw_gid, grps);
157: for (g = grouplist; g && ingroup == 0; g = g->next) {
158: if (g->gid == -1)
159: continue;
160: if (g->gid == pw->pw_gid)
161: ingroup = 1;
162: for (i = 0; i < ngrps && ingroup == 0; i++)
163: if (g->gid == grps[i])
164: ingroup = 1;
165: }
166: if (ingroup == 0)
167: continue;
168: }
1.1 deraadt 169: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
170: line[sizeof(utmp.ut_line)] = '\0';
171: if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
1.13 deraadt 172: warnx("%s", p);
1.1 deraadt 173: }
174: exit(0);
175: }
176:
177: void
178: makemsg(fname)
179: char *fname;
180: {
181: register int ch, cnt;
182: struct tm *lt;
183: struct passwd *pw;
184: struct stat sbuf;
185: time_t now, time();
186: FILE *fp;
187: int fd;
1.10 deraadt 188: char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[64];
1.4 deraadt 189: char tmpbuf[5];
1.11 d 190: char *ttynam;
1.1 deraadt 191:
1.10 deraadt 192: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
1.12 deraadt 193: if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
1.13 deraadt 194: errx(1, "can't open temporary file.");
1.1 deraadt 195: (void)unlink(tmpname);
196:
197: if (!nobanner) {
198: if (!(whom = getlogin()))
199: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
200: (void)gethostname(hostname, sizeof(hostname));
201: (void)time(&now);
202: lt = localtime(&now);
1.11 d 203: if ((ttynam = ttyname(STDERR_FILENO)) == NULL)
204: ttynam = "(not a tty)";
1.1 deraadt 205:
206: /*
207: * all this stuff is to blank out a square for the message;
208: * we wrap message lines at column 79, not 80, because some
209: * terminals wrap after 79, some do not, and we can't tell.
210: * Which means that we may leave a non-blank character
211: * in column 80, but that can't be helped.
212: */
213: (void)fprintf(fp, "\r%79s\r\n", " ");
1.3 deraadt 214: (void)snprintf(lbuf, sizeof lbuf,
215: "Broadcast Message from %s@%s", whom, hostname);
1.1 deraadt 216: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
1.3 deraadt 217: (void)snprintf(lbuf, sizeof lbuf,
1.11 d 218: " (%s) at %d:%02d ...", ttynam,
1.1 deraadt 219: lt->tm_hour, lt->tm_min);
220: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
221: }
222: (void)fprintf(fp, "%79s\r\n", " ");
223:
1.13 deraadt 224: if (fname) {
225: gid_t egid = getegid();
226:
227: setegid(getgid());
228: if (freopen(fname, "r", stdin) == NULL)
229: errx(1, "can't read %s.", fname);
230: setegid(egid);
231: }
1.1 deraadt 232: while (fgets(lbuf, sizeof(lbuf), stdin))
233: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
1.5 deraadt 234: vis(tmpbuf, ch, VIS_SAFE|VIS_NOSLASH, p[1]);
1.4 deraadt 235: if (cnt == 79+1-strlen(tmpbuf) || ch == '\n') {
236: for (; cnt < 79+1-strlen(tmpbuf); ++cnt)
1.1 deraadt 237: putc(' ', fp);
238: putc('\r', fp);
239: putc('\n', fp);
240: cnt = -1;
241: }
1.4 deraadt 242: if (ch != '\n') {
243: int xx;
244:
245: for (xx = 0; tmpbuf[xx]; xx++)
246: putc(tmpbuf[xx], fp);
247: }
1.1 deraadt 248: }
249: (void)fprintf(fp, "%79s\r\n", " ");
250: rewind(fp);
251:
1.9 form 252: if (fstat(fd, &sbuf))
1.13 deraadt 253: errx(1, "can't stat temporary file.");
1.1 deraadt 254: mbufsize = sbuf.st_size;
1.9 form 255: if (!(mbuf = malloc((u_int)mbufsize)))
1.13 deraadt 256: errx(1, "out of memory.");
1.9 form 257: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
1.13 deraadt 258: errx(1, "can't read temporary file.");
1.1 deraadt 259: (void)close(fd);
260: }
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