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6dbe3af9 KZ |
1 | /* |
2 | * Copyright (c) 1988, 1990 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * Modified for Linux, Mon Mar 8 18:08:30 1993, faith@cs.unc.edu | |
34 | */ | |
35 | ||
36 | #ifndef lint | |
37 | char copyright[] = | |
38 | "@(#) Copyright (c) 1988 Regents of the University of California.\n\ | |
39 | All rights reserved.\n"; | |
40 | #endif /* not lint */ | |
41 | ||
42 | #ifndef lint | |
43 | static char sccsid[] = "@(#)wall.c 5.14 (Berkeley) 3/2/91"; | |
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 | #include <utmp.h> | |
56 | #include <pwd.h> | |
57 | #include <stdio.h> | |
58 | #include <stdlib.h> | |
59 | #include <paths.h> | |
60 | ||
61 | #define IGNOREUSER "sleeper" | |
62 | ||
63 | int nobanner; | |
64 | int mbufsize; | |
65 | char *mbuf; | |
66 | ||
67 | /* ARGSUSED */ | |
68 | main(argc, argv) | |
69 | int argc; | |
70 | char **argv; | |
71 | { | |
72 | extern int optind; | |
73 | int ch; | |
74 | struct iovec iov; | |
75 | struct utmp utmp; | |
76 | FILE *fp; | |
77 | char *p, *ttymsg(); | |
78 | ||
79 | while ((ch = getopt(argc, argv, "n")) != EOF) | |
80 | switch (ch) { | |
81 | case 'n': | |
82 | /* undoc option for shutdown: suppress banner */ | |
83 | if (geteuid() == 0) | |
84 | nobanner = 1; | |
85 | break; | |
86 | case '?': | |
87 | default: | |
88 | usage: | |
89 | (void)fprintf(stderr, "usage: wall [file]\n"); | |
90 | exit(1); | |
91 | } | |
92 | argc -= optind; | |
93 | argv += optind; | |
94 | if (argc > 1) | |
95 | goto usage; | |
96 | ||
97 | #ifdef __linux__ | |
98 | if (argc != 1) | |
99 | makemsg(""); | |
100 | else | |
101 | #endif | |
102 | makemsg(*argv); | |
103 | ||
104 | if (!(fp = fopen(_PATH_UTMP, "r"))) { | |
105 | (void)fprintf(stderr, "wall: cannot read %s.\n", _PATH_UTMP); | |
106 | exit(1); | |
107 | } | |
108 | iov.iov_base = mbuf; | |
109 | iov.iov_len = mbufsize; | |
110 | /* NOSTRICT */ | |
111 | while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) { | |
112 | if (!utmp.ut_name[0] || | |
113 | !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name))) | |
114 | continue; | |
115 | #ifdef __linux__ | |
116 | if (utmp.ut_type != USER_PROCESS) | |
117 | continue; | |
118 | #endif | |
119 | if (p = ttymsg(&iov, 1, utmp.ut_line)) | |
120 | (void)fprintf(stderr, "wall: %s\n", p); | |
121 | } | |
122 | exit(0); | |
123 | } | |
124 | ||
125 | makemsg(fname) | |
126 | char *fname; | |
127 | { | |
128 | register int ch, cnt; | |
129 | struct tm *lt; | |
130 | struct passwd *pw; | |
131 | struct stat sbuf; | |
132 | time_t now, time(); | |
133 | FILE *fp; | |
134 | int fd; | |
135 | char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15]; | |
136 | char *getlogin(), *strcpy(), *ttyname(); | |
137 | ||
138 | (void)strcpy(tmpname, _PATH_TMP); | |
139 | (void)strcat(tmpname, "/wall.XXXXXX"); | |
140 | if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) { | |
141 | (void)fprintf(stderr, "wall: can't open temporary file.\n"); | |
142 | exit(1); | |
143 | } | |
144 | (void)unlink(tmpname); | |
145 | ||
146 | if (!nobanner) { | |
147 | if (!(whom = getlogin())) | |
148 | whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; | |
149 | (void)gethostname(hostname, sizeof(hostname)); | |
150 | (void)time(&now); | |
151 | lt = localtime(&now); | |
152 | ||
153 | /* | |
154 | * all this stuff is to blank out a square for the message; | |
155 | * we wrap message lines at column 79, not 80, because some | |
156 | * terminals wrap after 79, some do not, and we can't tell. | |
157 | * Which means that we may leave a non-blank character | |
158 | * in column 80, but that can't be helped. | |
159 | */ | |
160 | (void)fprintf(fp, "\r%79s\r\n", " "); | |
161 | (void)sprintf(lbuf, "Broadcast Message from %s@%s", | |
162 | whom, hostname); | |
163 | (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf); | |
164 | (void)sprintf(lbuf, " (%s) at %d:%02d ...", ttyname(2), | |
165 | lt->tm_hour, lt->tm_min); | |
166 | (void)fprintf(fp, "%-79.79s\r\n", lbuf); | |
167 | } | |
168 | (void)fprintf(fp, "%79s\r\n", " "); | |
169 | ||
170 | if (*fname && !(freopen(fname, "r", stdin))) { | |
171 | (void)fprintf(stderr, "wall: can't read %s.\n", fname); | |
172 | exit(1); | |
173 | } | |
174 | while (fgets(lbuf, sizeof(lbuf), stdin)) | |
175 | for (cnt = 0, p = lbuf; ch = *p; ++p, ++cnt) { | |
176 | if (cnt == 79 || ch == '\n') { | |
177 | for (; cnt < 79; ++cnt) | |
178 | putc(' ', fp); | |
179 | putc('\r', fp); | |
180 | putc('\n', fp); | |
181 | cnt = 0; | |
182 | } else | |
183 | putc(ch, fp); | |
184 | } | |
185 | (void)fprintf(fp, "%79s\r\n", " "); | |
186 | rewind(fp); | |
187 | ||
188 | if (fstat(fd, &sbuf)) { | |
189 | (void)fprintf(stderr, "wall: can't stat temporary file.\n"); | |
190 | exit(1); | |
191 | } | |
192 | mbufsize = sbuf.st_size; | |
193 | if (!(mbuf = malloc((u_int)mbufsize))) { | |
194 | (void)fprintf(stderr, "wall: out of memory.\n"); | |
195 | exit(1); | |
196 | } | |
197 | if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) { | |
198 | (void)fprintf(stderr, "wall: can't read temporary file.\n"); | |
199 | exit(1); | |
200 | } | |
201 | (void)close(fd); | |
202 | } |