Annotation of src/usr.bin/wall/wall.c, Revision 1.25
1.25 ! deraadt 1: /* $OpenBSD: wall.c,v 1.24 2009/08/03 20:30:03 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: /*
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:
38: #include <sys/param.h>
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>
50: #include <utmp.h>
1.4 deraadt 51: #include <vis.h>
1.9 form 52: #include <err.h>
1.1 deraadt 53:
1.6 deraadt 54: struct wallgroup {
1.15 millert 55: gid_t gid;
56: char *name;
57: char **mem;
1.6 deraadt 58: struct wallgroup *next;
59: } *grouplist;
60:
1.15 millert 61: void makemsg(char *);
62: void addgroup(struct group *, char *);
63: char *ttymsg(struct iovec *, int, char *, int);
64: __dead void usage(void);
1.1 deraadt 65:
66: int nobanner;
67: int mbufsize;
68: char *mbuf;
69:
70: /* ARGSUSED */
71: int
1.15 millert 72: main(int argc, char **argv)
1.1 deraadt 73: {
1.15 millert 74: FILE *fp;
75: int ch, ingroup;
1.1 deraadt 76: struct iovec iov;
77: struct utmp utmp;
1.15 millert 78: char *p, **mem;
1.1 deraadt 79: char line[sizeof(utmp.ut_line) + 1];
1.15 millert 80: char username[sizeof(utmp.ut_name) + 1];
81: struct passwd *pw;
82: struct group *grp;
1.6 deraadt 83: struct wallgroup *g;
1.1 deraadt 84:
1.8 millert 85: while ((ch = getopt(argc, argv, "ng:")) != -1)
1.1 deraadt 86: switch (ch) {
87: case 'n':
88: /* undoc option for shutdown: suppress banner */
1.15 millert 89: pw = getpwnam("nobody");
90: if (geteuid() == 0 || (pw && getuid() == pw->pw_uid))
1.1 deraadt 91: nobanner = 1;
92: break;
1.6 deraadt 93: case 'g':
1.15 millert 94: if ((grp = getgrnam(optarg)) == NULL)
95: errx(1, "unknown group `%s'", optarg);
96: addgroup(grp, optarg);
1.6 deraadt 97: break;
1.1 deraadt 98: default:
1.15 millert 99: usage();
1.1 deraadt 100: }
101: argc -= optind;
102: argv += optind;
103: if (argc > 1)
1.15 millert 104: usage();
1.6 deraadt 105:
1.1 deraadt 106: makemsg(*argv);
107:
1.9 form 108: if (!(fp = fopen(_PATH_UTMP, "r")))
1.21 henning 109: err(1, "cannot read %s", _PATH_UTMP);
1.1 deraadt 110: iov.iov_base = mbuf;
111: iov.iov_len = mbufsize;
112: /* NOSTRICT */
1.15 millert 113: while (fread(&utmp, sizeof(utmp), 1, fp) == 1) {
1.16 deraadt 114: if (!utmp.ut_name[0])
1.1 deraadt 115: continue;
1.6 deraadt 116: if (grouplist) {
1.15 millert 117: ingroup = 0;
118: strncpy(username, utmp.ut_name, sizeof(utmp.ut_name));
119: username[sizeof(utmp.ut_name)] = '\0';
1.6 deraadt 120: pw = getpwnam(username);
121: if (!pw)
122: continue;
123: for (g = grouplist; g && ingroup == 0; g = g->next) {
124: if (g->gid == pw->pw_gid)
125: ingroup = 1;
1.15 millert 126: for (mem = g->mem; *mem && ingroup == 0; mem++)
127: if (strcmp(username, *mem) == 0)
1.6 deraadt 128: ingroup = 1;
129: }
130: if (ingroup == 0)
131: continue;
132: }
1.1 deraadt 133: strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
134: line[sizeof(utmp.ut_line)] = '\0';
135: if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
1.13 deraadt 136: warnx("%s", p);
1.1 deraadt 137: }
138: exit(0);
139: }
140:
141: void
1.15 millert 142: makemsg(char *fname)
1.1 deraadt 143: {
1.15 millert 144: int ch, cnt;
1.1 deraadt 145: struct tm *lt;
146: struct passwd *pw;
147: struct stat sbuf;
1.19 deraadt 148: time_t now;
1.1 deraadt 149: FILE *fp;
150: int fd;
1.17 deraadt 151: char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
1.4 deraadt 152: char tmpbuf[5];
1.11 d 153: char *ttynam;
1.1 deraadt 154:
1.20 avsm 155: snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
1.15 millert 156: if ((fd = mkstemp(tmpname)) >= 0) {
157: (void)unlink(tmpname);
158: fp = fdopen(fd, "r+");
159: }
160: if (fd == -1 || fp == NULL)
1.21 henning 161: err(1, "can't open temporary file");
1.1 deraadt 162:
163: if (!nobanner) {
164: if (!(whom = getlogin()))
165: whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
166: (void)gethostname(hostname, sizeof(hostname));
167: (void)time(&now);
168: lt = localtime(&now);
1.11 d 169: if ((ttynam = ttyname(STDERR_FILENO)) == NULL)
170: ttynam = "(not a tty)";
1.1 deraadt 171:
172: /*
173: * all this stuff is to blank out a square for the message;
174: * we wrap message lines at column 79, not 80, because some
175: * terminals wrap after 79, some do not, and we can't tell.
176: * Which means that we may leave a non-blank character
177: * in column 80, but that can't be helped.
178: */
179: (void)fprintf(fp, "\r%79s\r\n", " ");
1.3 deraadt 180: (void)snprintf(lbuf, sizeof lbuf,
181: "Broadcast Message from %s@%s", whom, hostname);
1.1 deraadt 182: (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
1.3 deraadt 183: (void)snprintf(lbuf, sizeof lbuf,
1.11 d 184: " (%s) at %d:%02d ...", ttynam,
1.1 deraadt 185: lt->tm_hour, lt->tm_min);
186: (void)fprintf(fp, "%-79.79s\r\n", lbuf);
187: }
188: (void)fprintf(fp, "%79s\r\n", " ");
189:
1.13 deraadt 190: if (fname) {
191: gid_t egid = getegid();
192:
193: setegid(getgid());
194: if (freopen(fname, "r", stdin) == NULL)
1.21 henning 195: err(1, "can't read %s", fname);
1.13 deraadt 196: setegid(egid);
197: }
1.1 deraadt 198: while (fgets(lbuf, sizeof(lbuf), stdin))
199: for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
1.5 deraadt 200: vis(tmpbuf, ch, VIS_SAFE|VIS_NOSLASH, p[1]);
1.4 deraadt 201: if (cnt == 79+1-strlen(tmpbuf) || ch == '\n') {
202: for (; cnt < 79+1-strlen(tmpbuf); ++cnt)
1.1 deraadt 203: putc(' ', fp);
204: putc('\r', fp);
205: putc('\n', fp);
206: cnt = -1;
207: }
1.4 deraadt 208: if (ch != '\n') {
209: int xx;
210:
211: for (xx = 0; tmpbuf[xx]; xx++)
212: putc(tmpbuf[xx], fp);
213: }
1.1 deraadt 214: }
215: (void)fprintf(fp, "%79s\r\n", " ");
216: rewind(fp);
217:
1.9 form 218: if (fstat(fd, &sbuf))
1.21 henning 219: err(1, "can't stat temporary file");
1.1 deraadt 220: mbufsize = sbuf.st_size;
1.22 tom 221: mbuf = malloc((u_int)mbufsize);
222: if (mbuf == NULL)
223: err(1, NULL);
1.9 form 224: if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
1.21 henning 225: err(1, "can't read temporary file");
1.1 deraadt 226: (void)close(fd);
1.15 millert 227: }
228:
229: void
230: addgroup(struct group *grp, char *name)
231: {
232: int i;
233: struct wallgroup *g;
234:
235: for (i = 0; grp->gr_mem[i]; i++)
236: ;
237:
238: g = (struct wallgroup *)malloc(sizeof *g);
239: if (g == NULL)
1.22 tom 240: err(1, NULL);
1.15 millert 241: g->gid = grp->gr_gid;
242: g->name = name;
1.23 bluhm 243: g->mem = (char **)calloc(i + 1, sizeof(char *));
1.15 millert 244: if (g->mem == NULL)
1.22 tom 245: err(1, NULL);
1.15 millert 246: for (i = 0; grp->gr_mem[i] != NULL; i++) {
247: g->mem[i] = strdup(grp->gr_mem[i]);
248: if (g->mem[i] == NULL)
1.22 tom 249: err(1, NULL);
1.15 millert 250: }
251: g->mem[i] = NULL;
252: g->next = grouplist;
253: grouplist = g;
254: }
255:
256: void
257: usage(void)
258: {
259: extern char *__progname;
260:
261: (void)fprintf(stderr, "usage: %s [-g group] [file]\n", __progname);
262: exit(1);
1.1 deraadt 263: }
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