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Annotation of 43BSDTahoe/etc/talkd/announce.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)announce.c 5.6 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <sys/stat.h>
        !            24: #include <sgtty.h>
        !            25: #include <sys/ioctl.h>
        !            26: #include <sys/time.h>
        !            27: #include <stdio.h>
        !            28: #include <sys/wait.h>
        !            29: #include <errno.h>
        !            30: #include <syslog.h>
        !            31: 
        !            32: #include <protocols/talkd.h>
        !            33: 
        !            34: extern int errno;
        !            35: extern char hostname[];
        !            36: 
        !            37: /*
        !            38:  * Announce an invitation to talk.
        !            39:  *
        !            40:  * Because the tty driver insists on attaching a terminal-less
        !            41:  * process to any terminal that it writes on, we must fork a child
        !            42:  * to protect ourselves
        !            43:  */
        !            44: announce(request, remote_machine)
        !            45:        CTL_MSG *request;
        !            46:        char *remote_machine;
        !            47: {
        !            48:        int pid, val, status;
        !            49: 
        !            50:        if (pid = fork()) {
        !            51:                /* we are the parent, so wait for the child */
        !            52:                if (pid == -1)          /* the fork failed */
        !            53:                        return (FAILED);
        !            54:                do {
        !            55:                        val = wait(&status);
        !            56:                        if (val == -1) {
        !            57:                                if (errno == EINTR)
        !            58:                                        continue;
        !            59:                                /* shouldn't happen */
        !            60:                                syslog(LOG_WARNING, "announce: wait: %m");
        !            61:                                return (FAILED);
        !            62:                        }
        !            63:                } while (val != pid);
        !            64:                if (status&0377 > 0)    /* we were killed by some signal */
        !            65:                        return (FAILED);
        !            66:                /* Get the second byte, this is the exit/return code */
        !            67:                return ((status >> 8) & 0377);
        !            68:        }
        !            69:        /* we are the child, go and do it */
        !            70:        _exit(announce_proc(request, remote_machine));
        !            71: }
        !            72:        
        !            73: /*
        !            74:  * See if the user is accepting messages. If so, announce that 
        !            75:  * a talk is requested.
        !            76:  */
        !            77: announce_proc(request, remote_machine)
        !            78:        CTL_MSG *request;
        !            79:        char *remote_machine;
        !            80: {
        !            81:        int pid, status;
        !            82:        char full_tty[32];
        !            83:        FILE *tf;
        !            84:        struct stat stbuf;
        !            85: 
        !            86:        (void)sprintf(full_tty, "/dev/%s", request->r_tty);
        !            87:        if (access(full_tty, 0) != 0)
        !            88:                return (FAILED);
        !            89:        if ((tf = fopen(full_tty, "w")) == NULL)
        !            90:                return (PERMISSION_DENIED);
        !            91:        /*
        !            92:         * On first tty open, the server will have
        !            93:         * it's pgrp set, so disconnect us from the
        !            94:         * tty before we catch a signal.
        !            95:         */
        !            96:        ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
        !            97:        if (fstat(fileno(tf), &stbuf) < 0)
        !            98:                return (PERMISSION_DENIED);
        !            99:        if ((stbuf.st_mode&020) == 0)
        !           100:                return (PERMISSION_DENIED);
        !           101:        print_mesg(tf, request, remote_machine);
        !           102:        fclose(tf);
        !           103:        return (SUCCESS);
        !           104: }
        !           105: 
        !           106: #define max(a,b) ( (a) > (b) ? (a) : (b) )
        !           107: #define N_LINES 5
        !           108: #define N_CHARS 120
        !           109: 
        !           110: /*
        !           111:  * Build a block of characters containing the message. 
        !           112:  * It is sent blank filled and in a single block to
        !           113:  * try to keep the message in one piece if the recipient
        !           114:  * in in vi at the time
        !           115:  */
        !           116: print_mesg(tf, request, remote_machine)
        !           117:        FILE *tf;
        !           118:        CTL_MSG *request;
        !           119:        char *remote_machine;
        !           120: {
        !           121:        struct timeval clock;
        !           122:        struct timezone zone;
        !           123:        struct tm *localtime();
        !           124:        struct tm *localclock;
        !           125:        char line_buf[N_LINES][N_CHARS];
        !           126:        int sizes[N_LINES];
        !           127:        char big_buf[N_LINES*N_CHARS];
        !           128:        char *bptr, *lptr;
        !           129:        int i, j, max_size;
        !           130: 
        !           131:        i = 0;
        !           132:        max_size = 0;
        !           133:        gettimeofday(&clock, &zone);
        !           134:        localclock = localtime( &clock.tv_sec );
        !           135:        (void)sprintf(line_buf[i], " ");
        !           136:        sizes[i] = strlen(line_buf[i]);
        !           137:        max_size = max(max_size, sizes[i]);
        !           138:        i++;
        !           139:        (void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...",
        !           140:        hostname, localclock->tm_hour , localclock->tm_min );
        !           141:        sizes[i] = strlen(line_buf[i]);
        !           142:        max_size = max(max_size, sizes[i]);
        !           143:        i++;
        !           144:        (void)sprintf(line_buf[i], "talk: connection requested by %s@%s.",
        !           145:                request->l_name, remote_machine);
        !           146:        sizes[i] = strlen(line_buf[i]);
        !           147:        max_size = max(max_size, sizes[i]);
        !           148:        i++;
        !           149:        (void)sprintf(line_buf[i], "talk: respond with:  talk %s@%s",
        !           150:                request->l_name, remote_machine);
        !           151:        sizes[i] = strlen(line_buf[i]);
        !           152:        max_size = max(max_size, sizes[i]);
        !           153:        i++;
        !           154:        (void)sprintf(line_buf[i], " ");
        !           155:        sizes[i] = strlen(line_buf[i]);
        !           156:        max_size = max(max_size, sizes[i]);
        !           157:        i++;
        !           158:        bptr = big_buf;
        !           159:        *bptr++ = ''; /* send something to wake them up */
        !           160:        *bptr++ = '\r'; /* add a \r in case of raw mode */
        !           161:        *bptr++ = '\n';
        !           162:        for (i = 0; i < N_LINES; i++) {
        !           163:                /* copy the line into the big buffer */
        !           164:                lptr = line_buf[i];
        !           165:                while (*lptr != '\0')
        !           166:                        *(bptr++) = *(lptr++);
        !           167:                /* pad out the rest of the lines with blanks */
        !           168:                for (j = sizes[i]; j < max_size + 2; j++)
        !           169:                        *(bptr++) = ' ';
        !           170:                *(bptr++) = '\r';       /* add a \r in case of raw mode */
        !           171:                *(bptr++) = '\n';
        !           172:        }
        !           173:        *bptr = '\0';
        !           174:        fprintf(tf, big_buf);
        !           175:        fflush(tf);
        !           176:        ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
        !           177: }

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