Collapse gd_astpending and gd_reqpri together into gd_reqflags. gd_reqflags
[dragonfly.git] / libexec / comsat / comsat.c
CommitLineData
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1/*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. 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.
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32 *
33 * @(#) Copyright (c) 1980, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)comsat.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/comsat/comsat.c,v 1.13.2.1 2002/08/09 02:56:30 johan Exp $
36 * $DragonFly: src/libexec/comsat/comsat.c,v 1.2 2003/06/17 04:27:07 dillon Exp $
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37 */
38
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39#include <sys/param.h>
40#include <sys/socket.h>
41#include <sys/stat.h>
42#include <sys/file.h>
43#include <sys/wait.h>
44
45#include <netinet/in.h>
46
47#include <ctype.h>
48#include <err.h>
49#include <errno.h>
50#include <netdb.h>
51#include <paths.h>
52#include <pwd.h>
53#include <termios.h>
54#include <signal.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <syslog.h>
59#include <unistd.h>
60#include <utmp.h>
61
62int debug = 0;
63#define dsyslog if (debug) syslog
64
65#define MAXIDLE 120
66
67char hostname[MAXHOSTNAMELEN];
68struct utmp *utmp = NULL;
69time_t lastmsgtime;
70int nutmp, uf;
71
72void jkfprintf __P((FILE *, char[], char[], off_t));
73void mailfor __P((char *));
74void notify __P((struct utmp *, char[], off_t, int));
75void onalrm __P((int));
76void reapchildren __P((int));
77
78int
79main(argc, argv)
80 int argc;
81 char *argv[];
82{
83 struct sockaddr_in from;
84 register int cc;
85 int fromlen;
86 char msgbuf[256];
87
88 /* verify proper invocation */
89 fromlen = sizeof(from);
90 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
91 err(1, "getsockname");
92 openlog("comsat", LOG_PID, LOG_DAEMON);
93 if (chdir(_PATH_MAILDIR)) {
94 syslog(LOG_ERR, "chdir: %s: %m", _PATH_MAILDIR);
95 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
96 exit(1);
97 }
98 if ((uf = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
99 syslog(LOG_ERR, "open: %s: %m", _PATH_UTMP);
100 (void) recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
101 exit(1);
102 }
103 (void)time(&lastmsgtime);
104 (void)gethostname(hostname, sizeof(hostname));
105 onalrm(0);
106 (void)signal(SIGALRM, onalrm);
107 (void)signal(SIGTTOU, SIG_IGN);
108 (void)signal(SIGCHLD, reapchildren);
109 for (;;) {
110 cc = recv(0, msgbuf, sizeof(msgbuf) - 1, 0);
111 if (cc <= 0) {
112 if (errno != EINTR)
113 sleep(1);
114 errno = 0;
115 continue;
116 }
117 if (!nutmp) /* no one has logged in yet */
118 continue;
119 sigblock(sigmask(SIGALRM));
120 msgbuf[cc] = '\0';
121 (void)time(&lastmsgtime);
122 mailfor(msgbuf);
123 sigsetmask(0L);
124 }
125}
126
127void
128reapchildren(signo)
129 int signo;
130{
131 while (wait3(NULL, WNOHANG, NULL) > 0);
132}
133
134void
135onalrm(signo)
136 int signo;
137{
138 static u_int utmpsize; /* last malloced size for utmp */
139 static u_int utmpmtime; /* last modification time for utmp */
140 struct stat statbf;
141
142 if (time(NULL) - lastmsgtime >= MAXIDLE)
143 exit(0);
144 (void)alarm((u_int)15);
145 (void)fstat(uf, &statbf);
146 if (statbf.st_mtime > utmpmtime) {
147 utmpmtime = statbf.st_mtime;
148 if (statbf.st_size > utmpsize) {
149 utmpsize = statbf.st_size + 10 * sizeof(struct utmp);
150 if ((utmp = realloc(utmp, utmpsize)) == NULL) {
151 syslog(LOG_ERR, "%s", strerror(errno));
152 exit(1);
153 }
154 }
155 (void)lseek(uf, (off_t)0, L_SET);
156 nutmp = read(uf, utmp, (int)statbf.st_size)/sizeof(struct utmp);
157 }
158}
159
160void
161mailfor(name)
162 char *name;
163{
164 register struct utmp *utp = &utmp[nutmp];
165 register char *cp;
166 char *file;
167 off_t offset;
168 int folder;
169 char buf[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
170 char buf2[sizeof(_PATH_MAILDIR) + sizeof(utmp[0].ut_name) + 1];
171
172 if (!(cp = strchr(name, '@')))
173 return;
174 *cp = '\0';
175 offset = atoi(cp + 1);
176 if (!(cp = strchr(cp + 1, ':')))
177 file = name;
178 else
179 file = cp + 1;
180 sprintf(buf, "%s/%.*s", _PATH_MAILDIR, (int)sizeof(utmp[0].ut_name),
181 name);
182 if (*file != '/') {
183 sprintf(buf2, "%s/%.*s", _PATH_MAILDIR,
184 (int)sizeof(utmp[0].ut_name), file);
185 file = buf2;
186 }
187 folder = strcmp(buf, file);
188 while (--utp >= utmp)
189 if (!strncmp(utp->ut_name, name, sizeof(utmp[0].ut_name)))
190 notify(utp, file, offset, folder);
191}
192
193static char *cr;
194
195void
196notify(utp, file, offset, folder)
197 register struct utmp *utp;
198 char file[];
199 off_t offset;
200 int folder;
201{
202 FILE *tp;
203 struct stat stb;
204 struct termios tio;
205 char tty[20], name[sizeof(utmp[0].ut_name) + 1];
206
207 (void)snprintf(tty, sizeof(tty), "%s%.*s",
208 _PATH_DEV, (int)sizeof(utp->ut_line), utp->ut_line);
209 if (strchr(tty + sizeof(_PATH_DEV) - 1, '/')) {
210 /* A slash is an attempt to break security... */
211 syslog(LOG_AUTH | LOG_NOTICE, "'/' in \"%s\"", tty);
212 return;
213 }
214 if (stat(tty, &stb) || !(stb.st_mode & (S_IXUSR | S_IXGRP))) {
215 dsyslog(LOG_DEBUG, "%s: wrong mode on %s", utp->ut_name, tty);
216 return;
217 }
218 dsyslog(LOG_DEBUG, "notify %s on %s\n", utp->ut_name, tty);
219 if (fork())
220 return;
221 (void)signal(SIGALRM, SIG_DFL);
222 (void)alarm((u_int)30);
223 if ((tp = fopen(tty, "w")) == NULL) {
224 dsyslog(LOG_ERR, "%s: %s", tty, strerror(errno));
225 _exit(1);
226 }
227 (void)tcgetattr(fileno(tp), &tio);
228 cr = ((tio.c_oflag & (OPOST|ONLCR)) == (OPOST|ONLCR)) ? "\n" : "\n\r";
229 (void)strncpy(name, utp->ut_name, sizeof(utp->ut_name));
230 name[sizeof(name) - 1] = '\0';
231 switch (stb.st_mode & (S_IXUSR | S_IXGRP)) {
232 case S_IXUSR:
233 case (S_IXUSR | S_IXGRP):
234 (void)fprintf(tp,
235 "%s\007New mail for %s@%.*s\007 has arrived%s%s%s:%s----%s",
236 cr, name, (int)sizeof(hostname), hostname,
237 folder ? cr : "", folder ? "to " : "", folder ? file : "",
238 cr, cr);
239 jkfprintf(tp, name, file, offset);
240 break;
241 case S_IXGRP:
242 (void)fprintf(tp, "\007");
243 (void)fflush(tp);
244 (void)sleep(1);
245 (void)fprintf(tp, "\007");
246 break;
247 default:
248 break;
249 }
250 (void)fclose(tp);
251 _exit(0);
252}
253
254void
255jkfprintf(tp, user, file, offset)
256 register FILE *tp;
257 char user[];
258 char file[];
259 off_t offset;
260{
261 register unsigned char *cp, ch;
262 register FILE *fi;
263 register int linecnt, charcnt, inheader;
264 register struct passwd *p;
265 unsigned char line[BUFSIZ];
266
267 /* Set effective uid to user in case mail drop is on nfs */
268 if ((p = getpwnam(user)) != NULL)
269 (void) setuid(p->pw_uid);
270
271 if ((fi = fopen(file, "r")) == NULL)
272 return;
273
274 (void)fseek(fi, offset, L_SET);
275 /*
276 * Print the first 7 lines or 560 characters of the new mail
277 * (whichever comes first). Skip header crap other than
278 * From, Subject, To, and Date.
279 */
280 linecnt = 7;
281 charcnt = 560;
282 inheader = 1;
283 while (fgets(line, sizeof(line), fi) != NULL) {
284 if (inheader) {
285 if (line[0] == '\n') {
286 inheader = 0;
287 continue;
288 }
289 if (line[0] == ' ' || line[0] == '\t' ||
290 (strncmp(line, "From:", 5) &&
291 strncmp(line, "Subject:", 8)))
292 continue;
293 }
294 if (linecnt <= 0 || charcnt <= 0) {
295 (void)fprintf(tp, "...more...%s", cr);
296 (void)fclose(fi);
297 return;
298 }
299 /* strip weird stuff so can't trojan horse stupid terminals */
300 for (cp = line; (ch = *cp) && ch != '\n'; ++cp, --charcnt) {
301 /* disable upper controls and enable all other
302 8bit codes due to lack of locale knowledge
303 */
304 if (((ch & 0x80) && ch < 0xA0) ||
305 (!(ch & 0x80) && !isprint(ch) &&
306 !isspace(ch) && ch != '\a' && ch != '\b')
307 ) {
308 if (ch & 0x80) {
309 ch &= ~0x80;
310 (void)fputs("M-", tp);
311 }
312 if (iscntrl(ch)) {
313 ch ^= 0x40;
314 (void)fputc('^', tp);
315 }
316 }
317 (void)fputc(ch, tp);
318 }
319 (void)fputs(cr, tp);
320 --linecnt;
321 }
322 (void)fprintf(tp, "----%s\n", cr);
323 (void)fclose(fi);
324}