projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5ae73570 C |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | */ | |
| 6 | ||
| 7 | #include "bsd.h" | |
| 8 | ||
| 9 | #if defined(TALK_43) || defined(TALK_42) | |
| 10 | ||
| 11 | # include <stdio.h> | |
| 12 | # include <string.h> | |
| 13 | # include "talk_ctl.h" | |
| 14 | # include <sys/param.h> | |
| 15 | # include <netdb.h> | |
| 16 | ||
| 17 | extern CTL_MSG msg; | |
| 18 | ||
| 19 | struct hostent *gethostbyname(); | |
| 20 | struct servent *getservbyname(); | |
| 21 | ||
| 22 | static char hostname[MAXHOSTNAMELEN]; | |
| 23 | char *my_machine_name; | |
| 24 | ||
| 25 | /* | |
| 26 | * Determine the local user and machine | |
| 27 | */ | |
| 28 | get_local_name(my_name) | |
| 29 | char *my_name; | |
| 30 | { | |
| 31 | struct hostent *hp; | |
| 32 | struct servent *sp; | |
| 33 | ||
| 34 | /* Load these useful values into the standard message header */ | |
| 35 | msg.id_num = 0; | |
| 36 | (void) strncpy(msg.l_name, my_name, NAME_SIZE); | |
| 37 | msg.l_name[NAME_SIZE - 1] = '\0'; | |
| 38 | msg.r_tty[0] = '\0'; | |
| 39 | msg.pid = getpid(); | |
| 40 | # ifdef TALK_43 | |
| 41 | msg.vers = TALK_VERSION; | |
| 42 | msg.addr.sa_family = htons(AF_INET); | |
| 43 | msg.ctl_addr.sa_family = htons(AF_INET); | |
| 44 | # else | |
| 45 | msg.addr.sin_family = htons(AF_INET); | |
| 46 | msg.ctl_addr.sin_family = htons(AF_INET); | |
| 47 | # endif | |
| 48 | ||
| 49 | (void) gethostname(hostname, sizeof (hostname)); | |
| 50 | my_machine_name = hostname; | |
| 51 | /* look up the address of the local host */ | |
| 52 | hp = gethostbyname(my_machine_name); | |
| 53 | if (hp == (struct hostent *) 0) { | |
| 54 | printf("This machine doesn't exist. Boy, am I confused!\n"); | |
| 55 | exit(-1); | |
| 56 | } | |
| 57 | memcpy(&my_machine_addr, hp->h_addr, hp->h_length); | |
| 58 | /* find the daemon portal */ | |
| 59 | # ifdef TALK_43 | |
| 60 | sp = getservbyname("ntalk", "udp"); | |
| 61 | # else | |
| 62 | sp = getservbyname("talk", "udp"); | |
| 63 | # endif | |
| 64 | if (sp == 0) { | |
| 65 | # ifdef LOG | |
| 66 | syslog(LOG_ERR, "This machine doesn't support talk"); | |
| 67 | # else | |
| 68 | perror("This machine doesn't support talk"); | |
| 69 | # endif | |
| 70 | exit(-1); | |
| 71 | } | |
| 72 | daemon_port = sp->s_port; | |
| 73 | } | |
| 74 | ||
| 75 | /* | |
| 76 | * Determine the remote user and machine | |
| 77 | */ | |
| 78 | get_remote_name(his_address) | |
| 79 | char *his_address; | |
| 80 | { | |
| 81 | char *his_name; | |
| 82 | char *his_machine_name; | |
| 83 | char *ptr; | |
| 84 | struct hostent *hp; | |
| 85 | ||
| 86 | ||
| 87 | /* check for, and strip out, the machine name of the target */ | |
| 88 | for (ptr = his_address; *ptr != '\0' && *ptr != '@' && *ptr != ':' | |
| 89 | && *ptr != '!' && *ptr != '.'; ptr++) | |
| 90 | continue; | |
| 91 | if (*ptr == '\0') { | |
| 92 | /* this is a local to local talk */ | |
| 93 | his_name = his_address; | |
| 94 | his_machine_name = my_machine_name; | |
| 95 | } else { | |
| 96 | if (*ptr == '@') { | |
| 97 | /* user@host */ | |
| 98 | his_name = his_address; | |
| 99 | his_machine_name = ptr + 1; | |
| 100 | } else { | |
| 101 | /* host.user or host!user or host:user */ | |
| 102 | his_name = ptr + 1; | |
| 103 | his_machine_name = his_address; | |
| 104 | } | |
| 105 | *ptr = '\0'; | |
| 106 | } | |
| 107 | /* Load these useful values into the standard message header */ | |
| 108 | (void) strncpy(msg.r_name, his_name, NAME_SIZE); | |
| 109 | msg.r_name[NAME_SIZE - 1] = '\0'; | |
| 110 | ||
| 111 | /* if he is on the same machine, then simply copy */ | |
| 112 | if (bcmp((char *) &his_machine_name, (char *) &my_machine_name, | |
| 113 | sizeof(his_machine_name)) == 0) | |
| 114 | memcpy(&his_machine_addr, &my_machine_addr, | |
| 115 | sizeof(his_machine_name)); | |
| 116 | else { | |
| 117 | /* look up the address of the recipient's machine */ | |
| 118 | hp = gethostbyname(his_machine_name); | |
| 119 | if (hp == (struct hostent *) 0) | |
| 120 | return 0; /* unknown host */ | |
| 121 | memcpy(&his_machine_addr, hp->h_addr, hp->h_length); | |
| 122 | } | |
| 123 | return 1; | |
| 124 | } | |
| 125 | #endif |