xref: /original-bsd/libexec/talkd/announce.c (revision c3e32dec)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 static char sccsid[] = "@(#)announce.c	8.1 (Berkeley) 06/04/93";
10 #endif /* not lint */
11 
12 #include <sys/types.h>
13 #include <sys/uio.h>
14 #include <sys/stat.h>
15 #include <sys/time.h>
16 #include <sys/wait.h>
17 #include <sys/socket.h>
18 #include <protocols/talkd.h>
19 #include <sgtty.h>
20 #include <errno.h>
21 #include <syslog.h>
22 #include <unistd.h>
23 #include <stdio.h>
24 #include <string.h>
25 #include <paths.h>
26 
27 extern char hostname[];
28 
29 /*
30  * Announce an invitation to talk.
31  */
32 
33 /*
34  * See if the user is accepting messages. If so, announce that
35  * a talk is requested.
36  */
37 announce(request, remote_machine)
38 	CTL_MSG *request;
39 	char *remote_machine;
40 {
41 	char full_tty[32];
42 	FILE *tf;
43 	struct stat stbuf;
44 
45 	(void)sprintf(full_tty, "%s/%s", _PATH_DEV, request->r_tty);
46 	if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0)
47 		return (PERMISSION_DENIED);
48 	return (print_mesg(request->r_tty, tf, request, remote_machine));
49 }
50 
51 #define max(a,b) ( (a) > (b) ? (a) : (b) )
52 #define N_LINES 5
53 #define N_CHARS 120
54 
55 /*
56  * Build a block of characters containing the message.
57  * It is sent blank filled and in a single block to
58  * try to keep the message in one piece if the recipient
59  * in in vi at the time
60  */
61 print_mesg(tty, tf, request, remote_machine)
62 	char *tty;
63 	FILE *tf;
64 	CTL_MSG *request;
65 	char *remote_machine;
66 {
67 	struct timeval clock;
68 	struct timezone zone;
69 	struct tm *localtime();
70 	struct tm *localclock;
71 	struct iovec iovec;
72 	char line_buf[N_LINES][N_CHARS];
73 	int sizes[N_LINES];
74 	char big_buf[N_LINES*N_CHARS];
75 	char *bptr, *lptr, *ttymsg();
76 	int i, j, max_size;
77 
78 	i = 0;
79 	max_size = 0;
80 	gettimeofday(&clock, &zone);
81 	localclock = localtime( &clock.tv_sec );
82 	(void)sprintf(line_buf[i], " ");
83 	sizes[i] = strlen(line_buf[i]);
84 	max_size = max(max_size, sizes[i]);
85 	i++;
86 	(void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...",
87 	hostname, localclock->tm_hour , localclock->tm_min );
88 	sizes[i] = strlen(line_buf[i]);
89 	max_size = max(max_size, sizes[i]);
90 	i++;
91 	(void)sprintf(line_buf[i], "talk: connection requested by %s@%s",
92 		request->l_name, remote_machine);
93 	sizes[i] = strlen(line_buf[i]);
94 	max_size = max(max_size, sizes[i]);
95 	i++;
96 	(void)sprintf(line_buf[i], "talk: respond with:  talk %s@%s",
97 		request->l_name, remote_machine);
98 	sizes[i] = strlen(line_buf[i]);
99 	max_size = max(max_size, sizes[i]);
100 	i++;
101 	(void)sprintf(line_buf[i], " ");
102 	sizes[i] = strlen(line_buf[i]);
103 	max_size = max(max_size, sizes[i]);
104 	i++;
105 	bptr = big_buf;
106 	*bptr++ = ''; /* send something to wake them up */
107 	*bptr++ = '\r';	/* add a \r in case of raw mode */
108 	*bptr++ = '\n';
109 	for (i = 0; i < N_LINES; i++) {
110 		/* copy the line into the big buffer */
111 		lptr = line_buf[i];
112 		while (*lptr != '\0')
113 			*(bptr++) = *(lptr++);
114 		/* pad out the rest of the lines with blanks */
115 		for (j = sizes[i]; j < max_size + 2; j++)
116 			*(bptr++) = ' ';
117 		*(bptr++) = '\r';	/* add a \r in case of raw mode */
118 		*(bptr++) = '\n';
119 	}
120 	*bptr = '\0';
121 	iovec.iov_base = big_buf;
122 	iovec.iov_len = bptr - big_buf;
123 	/*
124 	 * we choose a timeout of RING_WAIT-5 seconds so that we don't
125 	 * stack up processes trying to write messages to a tty
126 	 * that is permanently blocked.
127 	 */
128 	if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)
129 		return (FAILED);
130 
131 	return (SUCCESS);
132 }
133