2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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33 * @(#)announce.c 8.3 (Berkeley) 4/28/95
34 * $FreeBSD: src/libexec/talkd/announce.c,v 1.11.2.3 2001/10/18 12:30:42 des Exp $
37 #include <sys/types.h>
42 #include <sys/socket.h>
44 #include <protocols/talkd.h>
58 extern char hostname[];
61 * Announce an invitation to talk.
65 * See if the user is accepting messages. If so, announce that
66 * a talk is requested.
69 announce(CTL_MSG *request, const char *remote_machine)
74 (void)snprintf(full_tty, sizeof(full_tty),
75 "%s%s", _PATH_DEV, request->r_tty);
76 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0)
77 return (PERMISSION_DENIED);
78 return (print_mesg(request->r_tty, request, remote_machine));
81 #define max(a,b) ( (a) > (b) ? (a) : (b) )
86 * Build a block of characters containing the message.
87 * It is sent blank filled and in a single block to
88 * try to keep the message in one piece if the recipient
92 print_mesg(const char *tty, CTL_MSG *request, const char *remote_machine)
96 struct tm *localclock;
98 char line_buf[N_LINES][N_CHARS];
100 char big_buf[N_LINES*N_CHARS];
101 char *bptr, *lptr, *vis_user;
106 gettimeofday(&now, NULL);
107 clock_sec = now.tv_sec;
108 localclock = localtime(&clock_sec);
109 (void)snprintf(line_buf[i], N_CHARS, " ");
110 sizes[i] = strlen(line_buf[i]);
111 max_size = max(max_size, sizes[i]);
113 (void)snprintf(line_buf[i], N_CHARS,
114 "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...",
115 hostname, localclock->tm_hour , localclock->tm_min,
116 localclock->tm_year + 1900, localclock->tm_mon + 1,
117 localclock->tm_mday);
118 sizes[i] = strlen(line_buf[i]);
119 max_size = max(max_size, sizes[i]);
122 vis_user = malloc(strlen(request->l_name) * 4 + 1);
123 strvis(vis_user, request->l_name, VIS_CSTYLE);
124 (void)snprintf(line_buf[i], N_CHARS,
125 "talk: connection requested by %s@%s", vis_user, remote_machine);
126 sizes[i] = strlen(line_buf[i]);
127 max_size = max(max_size, sizes[i]);
129 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s",
130 vis_user, remote_machine);
131 sizes[i] = strlen(line_buf[i]);
132 max_size = max(max_size, sizes[i]);
134 (void)snprintf(line_buf[i], N_CHARS, " ");
135 sizes[i] = strlen(line_buf[i]);
136 max_size = max(max_size, sizes[i]);
138 *bptr++ = '\007'; /* send something to wake them up */
139 *bptr++ = '\r'; /* add a \r in case of raw mode */
141 for (i = 0; i < N_LINES; i++) {
142 /* copy the line into the big buffer */
144 while (*lptr != '\0')
145 *(bptr++) = *(lptr++);
146 /* pad out the rest of the lines with blanks */
147 for (j = sizes[i]; j < max_size + 2; j++)
149 *(bptr++) = '\r'; /* add a \r in case of raw mode */
153 iovec.iov_base = big_buf;
154 iovec.iov_len = bptr - big_buf;
156 * we choose a timeout of RING_WAIT-5 seconds so that we don't
157 * stack up processes trying to write messages to a tty
158 * that is permanently blocked.
160 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)