2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1983, 1993
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34 static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95";
36 static const char rcsid[] =
40 #include <sys/types.h>
45 #include <sys/socket.h>
47 #include <protocols/talkd.h>
62 * Announce an invitation to talk.
66 * See if the user is accepting messages. If so, announce that
67 * a talk is requested.
70 announce(CTL_MSG *request, const char *remote_machine)
75 (void)snprintf(full_tty, sizeof(full_tty),
76 "%s%s", _PATH_DEV, request->r_tty);
77 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0)
78 return (PERMISSION_DENIED);
79 return (print_mesg(request->r_tty, request, remote_machine));
82 #define max(a,b) ( (a) > (b) ? (a) : (b) )
87 * Build a block of characters containing the message.
88 * It is sent blank filled and in a single block to
89 * try to keep the message in one piece if the recipient
93 print_mesg(const char *tty, CTL_MSG *request,
94 const char *remote_machine)
98 struct tm *localclock;
100 char line_buf[N_LINES][N_CHARS];
102 char big_buf[N_LINES*N_CHARS];
103 char *bptr, *lptr, *vis_user;
108 gettimeofday(&now, NULL);
109 clock_sec = now.tv_sec;
110 localclock = localtime(&clock_sec);
111 (void)snprintf(line_buf[i], N_CHARS, " ");
112 sizes[i] = strlen(line_buf[i]);
113 max_size = max(max_size, sizes[i]);
115 (void)snprintf(line_buf[i], N_CHARS,
116 "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...",
117 hostname, localclock->tm_hour , localclock->tm_min,
118 localclock->tm_year + 1900, localclock->tm_mon + 1,
119 localclock->tm_mday);
120 sizes[i] = strlen(line_buf[i]);
121 max_size = max(max_size, sizes[i]);
124 vis_user = malloc(strlen(request->l_name) * 4 + 1);
125 strvis(vis_user, request->l_name, VIS_CSTYLE);
126 (void)snprintf(line_buf[i], N_CHARS,
127 "talk: connection requested by %s@%s", vis_user, remote_machine);
128 sizes[i] = strlen(line_buf[i]);
129 max_size = max(max_size, sizes[i]);
131 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s",
132 vis_user, remote_machine);
133 sizes[i] = strlen(line_buf[i]);
134 max_size = max(max_size, sizes[i]);
136 (void)snprintf(line_buf[i], N_CHARS, " ");
137 sizes[i] = strlen(line_buf[i]);
138 max_size = max(max_size, sizes[i]);
141 *bptr++ = '\007'; /* send something to wake them up */
142 *bptr++ = '\r'; /* add a \r in case of raw mode */
144 for (i = 0; i < N_LINES; i++) {
145 /* copy the line into the big buffer */
147 while (*lptr != '\0')
148 *(bptr++) = *(lptr++);
149 /* pad out the rest of the lines with blanks */
150 for (j = sizes[i]; j < max_size + 2; j++)
152 *(bptr++) = '\r'; /* add a \r in case of raw mode */
156 iovec.iov_base = big_buf;
157 iovec.iov_len = bptr - big_buf;
159 * we choose a timeout of RING_WAIT-5 seconds so that we don't
160 * stack up processes trying to write messages to a tty
161 * that is permanently blocked.
163 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)