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 8.3 (Berkeley) 04/28/95"; 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 <vis.h> 26 #include <paths.h> 27 28 extern char hostname[]; 29 30 /* 31 * Announce an invitation to talk. 32 */ 33 34 /* 35 * See if the user is accepting messages. If so, announce that 36 * a talk is requested. 37 */ 38 announce(request, remote_machine) 39 CTL_MSG *request; 40 char *remote_machine; 41 { 42 char full_tty[32]; 43 FILE *tf; 44 struct stat stbuf; 45 46 (void)snprintf(full_tty, sizeof(full_tty), 47 "%s%s", _PATH_DEV, request->r_tty); 48 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 49 return (PERMISSION_DENIED); 50 return (print_mesg(request->r_tty, tf, request, remote_machine)); 51 } 52 53 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 54 #define N_LINES 5 55 #define N_CHARS 256 56 57 /* 58 * Build a block of characters containing the message. 59 * It is sent blank filled and in a single block to 60 * try to keep the message in one piece if the recipient 61 * in in vi at the time 62 */ 63 print_mesg(tty, tf, request, remote_machine) 64 char *tty; 65 FILE *tf; 66 CTL_MSG *request; 67 char *remote_machine; 68 { 69 struct timeval clock; 70 struct timezone zone; 71 struct tm *localtime(); 72 struct tm *localclock; 73 struct iovec iovec; 74 char line_buf[N_LINES][N_CHARS]; 75 int sizes[N_LINES]; 76 char big_buf[N_LINES*N_CHARS]; 77 char *bptr, *lptr, *vis_user; 78 int i, j, max_size; 79 80 i = 0; 81 max_size = 0; 82 gettimeofday(&clock, &zone); 83 localclock = localtime( &clock.tv_sec ); 84 (void)sprintf(line_buf[i], " "); 85 sizes[i] = strlen(line_buf[i]); 86 max_size = max(max_size, sizes[i]); 87 i++; 88 (void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...", 89 hostname, localclock->tm_hour , localclock->tm_min ); 90 sizes[i] = strlen(line_buf[i]); 91 max_size = max(max_size, sizes[i]); 92 i++; 93 vis_user = (char *) malloc(strlen(request->l_name) * 4 + 1); 94 strvis(vis_user, request->l_name, VIS_CSTYLE); 95 (void)sprintf(line_buf[i], "talk: connection requested by %s@%s", 96 vis_user, remote_machine); 97 sizes[i] = strlen(line_buf[i]); 98 max_size = max(max_size, sizes[i]); 99 i++; 100 (void)sprintf(line_buf[i], "talk: respond with: talk %s@%s", 101 vis_user, remote_machine); 102 sizes[i] = strlen(line_buf[i]); 103 max_size = max(max_size, sizes[i]); 104 i++; 105 (void)sprintf(line_buf[i], " "); 106 sizes[i] = strlen(line_buf[i]); 107 max_size = max(max_size, sizes[i]); 108 i++; 109 bptr = big_buf; 110 *bptr++ = ''; /* send something to wake them up */ 111 *bptr++ = '\r'; /* add a \r in case of raw mode */ 112 *bptr++ = '\n'; 113 for (i = 0; i < N_LINES; i++) { 114 /* copy the line into the big buffer */ 115 lptr = line_buf[i]; 116 while (*lptr != '\0') 117 *(bptr++) = *(lptr++); 118 /* pad out the rest of the lines with blanks */ 119 for (j = sizes[i]; j < max_size + 2; j++) 120 *(bptr++) = ' '; 121 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 122 *(bptr++) = '\n'; 123 } 124 *bptr = '\0'; 125 iovec.iov_base = big_buf; 126 iovec.iov_len = bptr - big_buf; 127 /* 128 * we choose a timeout of RING_WAIT-5 seconds so that we don't 129 * stack up processes trying to write messages to a tty 130 * that is permanently blocked. 131 */ 132 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 133 return (FAILED); 134 135 return (SUCCESS); 136 } 137