2 ** rcvtty.c -- a rcvmail program (a lot like rcvalert) handling IPC ttys
4 ** This code is Copyright (c) 2002, by the authors of nmh. See the
5 ** COPYRIGHT file in the root directory of the nmh distribution for
6 ** complete copyright information.
9 /* Changed to use getutent() and friends. Assumes that when getutent() exists,
10 ** a number of other things also exist. Please check.
11 ** Ruud de Rooij <ruud@ruud.org> Sun, 28 May 2000 17:28:55 +0200
15 #include <h/signals.h>
16 #include <h/rcvmail.h>
17 #include <h/scansbr.h>
28 # define UTMP_FILE _PATH_UTMP
30 # define UTMP_FILE "/etc/utmp"
36 "%2(hour{dtimenow}):%02(min{dtimenow}): %<(size)%5(size) %>%<{encrypted}E%>\
37 %<(mymbox{from})%<{to}To:%14(friendly{to})%>%>%<(zero)%17(friendly{from})%> \
38 %{subject}%<{body}<<%{body}>>%>"
40 static struct swit switches[] = {
44 { "form formatfile", 0 },
46 { "format string", 5 },
48 { "width columns", 0 },
66 static int newline = 1;
69 static char *form = NULL;
70 static char *format = NULL;
73 ** external prototypes
75 char *getusername(void);
80 static RETSIGTYPE alrmser(int);
81 static int message_fd(char **);
82 static int header_fd(void);
83 static void alert(char *, int);
87 main(int argc, char **argv)
90 char *cp, *user, buf[BUFSIZ], tty[BUFSIZ];
91 char **argp, **arguments, *vec[MAXARGS];
100 setlocale(LC_ALL, "");
102 invo_name = mhbasename(argv[0]);
104 /* read user profile/context */
108 arguments = getarguments(invo_name, argc, argv, 1);
111 while ((cp = *argp++)) {
113 switch (smatch(++cp, switches)) {
115 ambigsw(cp, switches);
122 snprintf(buf, sizeof(buf),
125 print_help(buf, switches, 1);
128 print_version(invo_name);
136 if (!(form = *argp++) || *form == '-')
137 adios(NULL, "missing argument to %s", argp[-2]);
141 if (!(format = *argp++) || *format == '-')
142 adios(NULL, "missing argument to %s", argp[-2]);
147 if (!(cp = *argp++) || *cp == '-')
148 adios(NULL, "missing argument to %s", argp[-2]);
170 if ((md = vecp ? message_fd(vec) : header_fd()) == NOTOK)
173 user = getusername();
177 while ((utp = getutent()) != NULL) {
179 #ifdef HAVE_STRUCT_UTMP_UT_TYPE
180 utp->ut_type == USER_PROCESS &&
182 utp->ut_name[0] != 0 && utp->ut_line[0] != 0
183 && strncmp(user, utp->ut_name,
184 sizeof(utp->ut_name)) == 0) {
185 strncpy(tty, utp->ut_line, sizeof(utp->ut_line));
191 if ((uf = fopen(UTMP_FILE, "r")) == NULL)
193 while (fread((char *) &ut, sizeof(ut), 1, uf) == 1)
194 if (ut.ut_name[0] != 0 &&
195 strncmp(user, ut.ut_name, sizeof(ut.ut_name))
197 strncpy(tty, ut.ut_line, sizeof(ut.ut_line));
204 return 0; /* dead code to satisfy the compiler */
211 #ifndef RELIABLE_SIGNALS
212 SIGNAL(SIGALRM, alrmser);
220 message_fd(char **vec)
223 int bytes, fd, seconds;
228 fd = mkstemp(strncpy(tmpfil, "/tmp/rcvttyXXXXX", sizeof(tmpfil)));
230 unlink(mktemp(strncpy(tmpfil, "/tmp/rcvttyXXXXX", sizeof(tmpfil))));
231 if ((fd = open(tmpfil, O_RDWR | O_CREAT | O_TRUNC, 0600)) == NOTOK)
236 if ((child_id = vfork()) == NOTOK) {
240 } else if (child_id) {
242 if (!setjmp(myctx)) {
243 SIGNAL(SIGALRM, alrmser);
244 bytes = fstat(fileno(stdin), &st) != NOTOK ?
245 (int) st.st_size : 100;
247 /* amount of time to wait depends on message size */
249 /* give at least 5 minutes */
251 } else if (bytes >= 90000) {
252 /* but 30 minutes should be long enough */
255 seconds = (bytes / 60) + 300;
257 alarm((unsigned int) seconds);
258 pidwait(child_id, OK);
261 if (fstat(fd, &st) != NOTOK && st.st_size > (off_t) 0)
265 ** Ruthlessly kill the child and anything
266 ** else in its process group.
268 KILLPG(child_id, SIGKILL);
276 if (dup2(fd, 1) == NOTOK || dup2(fd, 2) == NOTOK)
279 setpgid((pid_t) 0, getpid()); /* put in own process group */
282 return 1; /* dead code to satisfy compiler */
293 tfile = m_mktemp2(NULL, invo_name, &fd, NULL);
294 if (tfile == NULL) return NOTOK;
299 /* get new format string */
300 nfs = new_fs(form, format, SCANFMT);
301 scan(stdin, 0, 0, nfs, width, 0, 0, NULL, 0L, 0);
303 write(fd, "\n\r", 2);
304 write(fd, scanl, strlen(scanl));
306 write(fd, "\007", 1);
313 alert(char *tty, int md)
316 char buffer[BUFSIZ], ttyspec[BUFSIZ];
319 snprintf(ttyspec, sizeof(ttyspec), "/dev/%s", tty);
322 ** The mask depends on whether we are checking for
323 ** write permission based on `biff' or `mesg'.
325 mask = biff ? S_IEXEC : (S_IWRITE >> 3);
326 if (stat(ttyspec, &st) == NOTOK || (st.st_mode & mask) == 0)
329 if (!setjmp(myctx)) {
330 SIGNAL(SIGALRM, alrmser);
332 td = open(ttyspec, O_WRONLY);
341 lseek(md, (off_t) 0, SEEK_SET);
343 while ((i = read(md, buffer, sizeof(buffer))) > 0)
344 if (write(td, buffer, i) != i)