[1969] | 1 | /* |
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| 2 | * This file is part of the OLC On-Line Consulting System. |
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| 3 | * It contains functions for handling the daemon's I/O. |
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| 4 | * |
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| 5 | * Win Treese |
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| 6 | * Dan Morgan |
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| 7 | * Bill Saphir |
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| 8 | * MIT Project Athena |
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| 9 | * |
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| 10 | * Ken Raeburn |
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| 11 | * MIT Information Systems |
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| 12 | * |
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| 13 | * Tom Coppeto |
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| 14 | * MIT Project Athena |
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| 15 | * |
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| 16 | * Copyright (c) 1988 by the Massachusetts Institute of Technology |
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| 17 | * |
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| 18 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/olc/server/olcd/notify.c,v $ |
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| 19 | * $Author: tjcoppet $ |
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| 20 | */ |
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| 21 | |
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| 22 | #ifndef lint |
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[2077] | 23 | static char rcsid[]="$Header: /afs/dev.mit.edu/source/repository/athena/bin/olc/server/olcd/notify.c,v 1.4 1989-08-22 16:30:10 tjcoppet Exp $"; |
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[1969] | 24 | #endif |
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| 25 | |
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| 26 | |
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| 27 | #include <olc/olc.h> |
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| 28 | #include <olcd.h> |
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| 29 | |
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| 30 | #ifdef ZEPHYR |
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| 31 | #include <zephyr/zephyr.h> /* Zephyr defs. */ |
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| 32 | #endif ZEPHYR |
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| 33 | |
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| 34 | #include <sys/socket.h> /* IPC socket defs. */ |
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| 35 | #include <sys/file.h> /* File handling defs. */ |
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| 36 | #include <sys/stat.h> /* File status defs. */ |
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| 37 | #include <sys/wait.h> /* */ |
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| 38 | #include <netdb.h> /* Net database defs. */ |
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| 39 | #include <pwd.h> /* Directory defs. */ |
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| 40 | #include <signal.h> /* System signal definitions. */ |
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| 41 | #include <sgtty.h> /* Terminal param. definitions. */ |
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| 42 | #include <setjmp.h> |
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| 43 | |
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| 44 | |
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| 45 | /* External Variables. */ |
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| 46 | |
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| 47 | extern char DaemonHost[]; /* Name of daemon's machine. */ |
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| 48 | |
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| 49 | int notice_timeout(); |
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| 50 | static jmp_buf env; |
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| 51 | |
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| 52 | /* |
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| 53 | * Function: write_message() uses the program "write" to send a message |
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| 54 | * from one person to another within the OLC system. |
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| 55 | * Arguments: touser: Username of person receiving the message. |
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| 56 | * tomachine: Name of machine he is using. |
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| 57 | * fromuser: Username of person sending the message. |
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| 58 | * frommachine: Name of machine she is using. |
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| 59 | * message: Ptr. to buffer containing message. |
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| 60 | * Returns: SUCCESS or ERROR. |
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| 61 | * Notes: |
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| 62 | * First try using zwrite_message() for Zephyr users; if that fails, |
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| 63 | * use the standard Unix write code. |
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| 64 | * This code is essentially the same as that in write.c for the |
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| 65 | * program 'write'. |
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| 66 | * |
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| 67 | */ |
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| 68 | |
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| 69 | static int write_port = 0; |
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| 70 | |
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| 71 | ERRCODE |
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| 72 | write_message(touser, tomachine, fromuser, frommachine, message) |
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| 73 | char *touser, *tomachine, *fromuser, *frommachine, *message; |
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| 74 | { |
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| 75 | FILE *tf = NULL; /* Temporary file. */ |
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| 76 | int fds; /* Socket descriptor. */ |
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| 77 | char buf[BUFSIZE]; /* Message buffer. */ |
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| 78 | char error[ERRSIZE]; /* Error message. */ |
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| 79 | struct hostent *host; /* Host entry for receiver. */ |
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| 80 | struct sockaddr_in sin; /* Socket address. */ |
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| 81 | int flag = 0; |
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| 82 | |
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| 83 | if (touser == (char *)NULL) /* User sanity check. */ |
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| 84 | return(ERROR); |
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| 85 | |
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| 86 | #ifdef ZEPHYR |
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| 87 | /* First try using Zephyr write. If return status is anything |
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| 88 | * but SUCCESS, try again using Unix write. |
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| 89 | */ |
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| 90 | if (zwrite_message(touser, message) == SUCCESS) |
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| 91 | return(SUCCESS); |
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| 92 | #endif ZEPHYR |
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| 93 | |
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| 94 | if (write_port == 0) { |
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| 95 | struct servent *service; |
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| 96 | service = getservbyname("write", "tcp"); |
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| 97 | if (!service) { |
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| 98 | log_error("write_message: Can't find 'write' service"); |
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| 99 | return(ERROR); |
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| 100 | } |
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| 101 | write_port = service->s_port; |
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| 102 | } |
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| 103 | |
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| 104 | host = gethostbyname(tomachine); |
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| 105 | if (host == (struct hostent *)NULL) { |
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| 106 | (void) sprintf(error, |
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| 107 | "Can't resolve name of host '%s'", tomachine); |
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| 108 | log_error(error); |
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| 109 | return(ERROR); |
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| 110 | } |
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| 111 | sin.sin_family = host->h_addrtype; |
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| 112 | bcopy(host->h_addr, (char *) &sin.sin_addr, host->h_length); |
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| 113 | sin.sin_port = write_port; |
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| 114 | fds = socket(host->h_addrtype, SOCK_STREAM, 0); |
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| 115 | if (fds < 0) { |
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| 116 | perror("socket"); |
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| 117 | exit(1); |
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| 118 | } |
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| 119 | |
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| 120 | |
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| 121 | signal(SIGALRM, notice_timeout); |
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| 122 | alarm(OLCD_TIMEOUT); |
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| 123 | if(setjmp(env) != 0) { |
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| 124 | sprintf(error, "Unable to contact writed on %s", tomachine); |
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| 125 | log_error(error); |
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| 126 | if(tf!=NULL) |
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| 127 | fclose(tf); |
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| 128 | close(fds); |
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| 129 | alarm(0); |
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| 130 | return(ERROR); |
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| 131 | } |
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| 132 | |
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| 133 | |
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| 134 | if (connect(fds, &sin, sizeof (sin)) < 0) { |
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| 135 | alarm(0); |
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| 136 | (void) close(fds); |
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| 137 | return(MACHINE_DOWN); |
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| 138 | } |
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| 139 | (void) write(fds, fromuser, strlen(fromuser)); |
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| 140 | (void) write(fds, "@", 1); |
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| 141 | (void) write(fds, frommachine, strlen(frommachine)); |
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| 142 | (void) write(fds, " ", 1); |
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| 143 | (void) write(fds, touser, strlen(touser)); |
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| 144 | (void) write(fds, "\r\n", 2); |
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| 145 | tf = fdopen(fds, "r"); |
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| 146 | flag++; |
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| 147 | while (1) { |
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| 148 | if (fgets(buf, sizeof(buf), tf) == (char *)NULL) { |
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| 149 | (void) fclose(tf); |
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| 150 | (void) close(fds); |
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| 151 | alarm(0); |
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| 152 | return(LOGGED_OUT); |
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| 153 | } |
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| 154 | if (buf[0] == '\n') |
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| 155 | break; |
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| 156 | (void) write(1, buf, strlen(buf)); |
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| 157 | } |
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| 158 | (void) write(fds, message, strlen(message)); |
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| 159 | (void) write(fds, "\r\n", 2); |
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| 160 | (void) fclose(tf); |
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| 161 | (void) close(fds); |
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| 162 | alarm(0); |
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| 163 | return(SUCCESS); |
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| 164 | } |
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| 165 | |
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| 166 | |
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| 167 | int |
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| 168 | notice_timeout(a) |
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| 169 | int a; |
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| 170 | { |
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| 171 | longjmp(env, 1); |
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| 172 | } |
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| 173 | |
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| 174 | |
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| 175 | /* |
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| 176 | * Function: write_message_to_user() sends a message from the |
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| 177 | * daemon to a user using "write". |
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| 178 | * Arguments: user: Ptr. to user structure. |
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| 179 | * message: Ptr. to buffer containing the message. |
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| 180 | * flags: Specifies special actions. |
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| 181 | * Returns: SUCCESS or ERROR. |
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| 182 | * Notes: |
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| 183 | * First, try to write a message to the user. If it does not |
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| 184 | * succeed, notify the consultant. |
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| 185 | */ |
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| 186 | |
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| 187 | |
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| 188 | ERRCODE |
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| 189 | write_message_to_user(k, message, flags) |
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| 190 | KNUCKLE *k; |
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| 191 | char *message; |
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| 192 | int flags; |
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| 193 | { |
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| 194 | int result; /* Result of writing the message. */ |
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| 195 | char msgbuf[BUFSIZE]; /* Message buffer. */ |
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| 196 | int status; |
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| 197 | |
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| 198 | if (k == (KNUCKLE *) NULL) |
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| 199 | return(ERROR); |
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| 200 | |
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[2076] | 201 | if(k->user->no_knuckles > 1) |
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| 202 | { |
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| 203 | sprintf(msgbuf,"To: %s %s@%s (%d)\n",k->title,k->user->username, |
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| 204 | k->user->realm,k->instance); |
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| 205 | strcat(msgbuf,message); |
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| 206 | result = write_message(k->user->username, k->user->machine, |
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| 207 | "OLC-Daemon", DaemonHost, msgbuf); |
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| 208 | } |
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| 209 | else |
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| 210 | result = write_message(k->user->username, k->user->machine, |
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| 211 | "OLC-Daemon", DaemonHost, message); |
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[1969] | 212 | |
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| 213 | switch(result) |
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| 214 | { |
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| 215 | case ERROR: |
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| 216 | set_status(k->user, UNKNOWN_STATUS); |
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| 217 | (void) sprintf(msgbuf,"Unable to contact %s %s. Cause unknown", |
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| 218 | k->title, k->user->username); |
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| 219 | if(!(flags & NO_RESPOND)) |
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| 220 | (void) write_message_to_user(k->connected, msgbuf, NO_RESPOND); |
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| 221 | log_daemon(k, msgbuf); |
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| 222 | status = ERROR; |
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| 223 | break; |
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| 224 | |
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| 225 | case MACHINE_DOWN: |
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[2025] | 226 | set_status(k->user, UNKNOWN_STATUS); |
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[1969] | 227 | (void) sprintf(msgbuf,"Unable to contact %s %s. Host machine down.", |
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| 228 | k->title, k->user->username); |
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| 229 | if(!(flags & NO_RESPOND)) |
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| 230 | (void) write_message_to_user(k->connected, msgbuf, NO_RESPOND); |
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| 231 | log_daemon(k, msgbuf); |
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| 232 | status = ERROR; |
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| 233 | break; |
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| 234 | |
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| 235 | case LOGGED_OUT: |
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| 236 | set_status(k->user, LOGGED_OUT); |
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| 237 | (void) sprintf(msgbuf,"Unable to contact %s %s. User logged out.", |
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| 238 | k->title, k->user->username); |
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| 239 | if(!(flags & NO_RESPOND)) |
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| 240 | (void) write_message_to_user(k->connected, msgbuf, NO_RESPOND); |
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| 241 | log_daemon(k, msgbuf); |
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| 242 | status = ERROR; |
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| 243 | break; |
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| 244 | |
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| 245 | default: |
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[2025] | 246 | set_status(k->user,ACTIVE); |
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[1969] | 247 | status = SUCCESS; |
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| 248 | break; |
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| 249 | } |
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| 250 | return(status); |
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| 251 | } |
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| 252 | |
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| 253 | #define FUDGEFACTOR 20 |
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| 254 | #define MESSAGE_CLASS "MESSAGE" |
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| 255 | #define PERSONAL_INSTANCE "PERSONAL" |
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| 256 | #define OLC_INSTANCE "OLC" |
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| 257 | #ifdef TEST |
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| 258 | #define OLC_CLASS "OLCTEST" |
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| 259 | #else TEST |
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[2077] | 260 | #define OLC_CLASS "OLC" |
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[1969] | 261 | #endif TEST |
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| 262 | |
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| 263 | ERRCODE olc_broadcast_message(instance,message, code) |
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| 264 | char *instance, *message, *code; |
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| 265 | { |
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| 266 | #ifdef ZEPHYR |
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| 267 | if(zsend_message(OLC_CLASS,instance,code,"",message,0) == ERROR) |
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| 268 | return(ERROR); |
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| 269 | #endif ZEPHYR |
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| 270 | |
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| 271 | return(SUCCESS); |
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| 272 | } |
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| 273 | |
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| 274 | #ifdef ZEPHYR |
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| 275 | |
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| 276 | /* |
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| 277 | * Function: zwrite_message(username, message) writes a message to the |
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| 278 | * specified user. |
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| 279 | * Arguments: username: Username of intended recipient. |
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| 280 | * message: Message to send. |
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| 281 | * Returns: SUCCESS if message sent successfully, else ERROR. |
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| 282 | * |
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| 283 | * Inspired greatly by Robert French's zwrite.c (i.e. somewhat swiped). |
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| 284 | * |
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| 285 | */ |
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| 286 | |
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| 287 | |
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| 288 | ERRCODE |
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| 289 | zwrite_message(username, message) |
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| 290 | char *username; |
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| 291 | char *message; |
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| 292 | { |
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| 293 | char error[ERRSIZE]; |
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| 294 | |
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| 295 | /* Sanity check the username. */ |
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| 296 | if (username == NULL) |
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| 297 | { |
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| 298 | (void) sprintf(error, "zwrite_message: null username"); |
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| 299 | log_error(error); |
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| 300 | return(ERROR); |
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| 301 | } |
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| 302 | if (strlen(username) == 0) |
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| 303 | { |
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| 304 | (void) sprintf(error, "zwrite_message: zero length username"); |
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| 305 | log_error(error); |
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| 306 | return(ERROR); |
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| 307 | } |
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| 308 | |
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| 309 | if(zsend_message(MESSAGE_CLASS,PERSONAL_INSTANCE,"olc hello",username,message,0) |
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| 310 | == ERROR) |
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| 311 | return(ERROR); |
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| 312 | |
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| 313 | return(SUCCESS); |
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| 314 | } |
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| 315 | |
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| 316 | |
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| 317 | ERRCODE |
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| 318 | zsend_message(class,instance,opcode,username,message, flags) |
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| 319 | char *class,*instance,*opcode,*username,*message; |
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| 320 | int flags; |
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| 321 | { |
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| 322 | ZNotice_t notice; /* Zephyr notice */ |
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| 323 | int ret; /* return value, length */ |
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| 324 | char error[ERRSIZE]; |
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| 325 | char buf[BUFSIZ]; |
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| 326 | char *signature = "From: OLC Service \n"; |
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| 327 | |
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| 328 | #ifdef lint |
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| 329 | flags = flags; |
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| 330 | opcode = opcode; |
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| 331 | #endif lint; |
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| 332 | |
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| 333 | if ((ret = ZInitialize()) != ZERR_NONE) |
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| 334 | { |
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| 335 | (void) sprintf(error, "zwrite_message: couldn't ZInitialize"); |
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| 336 | log_error(error); |
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| 337 | return(ERROR); /* Oops, couldn't initialize. */ |
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| 338 | } |
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| 339 | |
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| 340 | bzero(¬ice, sizeof(ZNotice_t)); |
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| 341 | |
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| 342 | notice.z_kind = ACKED; |
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| 343 | notice.z_port = 0; |
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| 344 | notice.z_class = class; |
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| 345 | notice.z_class_inst = instance; |
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| 346 | notice.z_sender = 0; |
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| 347 | notice.z_message_len = 0; |
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| 348 | notice.z_recipient = username; |
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| 349 | notice.z_default_format = "Message $message"; |
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| 350 | notice.z_opcode = opcode; |
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| 351 | |
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| 352 | (void) strcpy(buf,signature); |
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| 353 | (void) strcat(buf,message); |
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| 354 | |
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| 355 | |
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| 356 | /* Watch the moving pointer.... */ |
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| 357 | notice.z_message = buf; |
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| 358 | notice.z_message_len = strlen(buf) + 1; |
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| 359 | ret = zsend(¬ice); /* send real message */ |
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| 360 | |
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| 361 | return(ret); |
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| 362 | } |
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| 363 | |
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| 364 | /* |
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| 365 | * Function: zsend(¬ice, isreal): Send a Zephyr notice. |
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| 366 | * Arguments: notice: Zephyr notice to send. |
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| 367 | * Returns: SUCCESS on success, else ERROR |
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| 368 | */ |
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| 369 | |
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| 370 | ERRCODE |
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| 371 | zsend(notice) |
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| 372 | ZNotice_t *notice; |
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| 373 | { |
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| 374 | int ret; |
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| 375 | ZNotice_t retnotice; |
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| 376 | |
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| 377 | if ((ret = ZSendNotice(notice, ZAUTH)) != ZERR_NONE) |
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| 378 | { |
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| 379 | /* Some sort of unknown communications error. */ |
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| 380 | fprintf(stderr, "zsend: error %d from ZSendNotice", ret); |
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| 381 | return(ERROR); |
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| 382 | } |
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| 383 | |
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| 384 | if ((ret = ZIfNotice(&retnotice, (struct sockaddr_in *) 0, |
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| 385 | ZCompareUIDPred, (char *) ¬ice->z_uid)) != |
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| 386 | ZERR_NONE) |
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| 387 | { |
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| 388 | /* Server acknowledgement error here. */ |
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| 389 | fprintf(stderr, "zsend: error %d from ZIfNotice", ret); |
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| 390 | ZFreeNotice(&retnotice); |
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| 391 | return(ERROR); |
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| 392 | } |
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| 393 | |
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| 394 | if (retnotice.z_kind == SERVNAK) |
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| 395 | { |
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| 396 | fprintf(stderr, "zsend: authentication failure"); |
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| 397 | ZFreeNotice(&retnotice); |
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| 398 | return(ERROR); |
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| 399 | } |
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| 400 | |
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| 401 | if (retnotice.z_kind != SERVACK || !retnotice.z_message_len) |
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| 402 | { |
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| 403 | fprintf(stderr, "zsend: server failure during SERVACK"); |
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| 404 | ZFreeNotice(&retnotice); |
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| 405 | return(ERROR); |
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| 406 | } |
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| 407 | |
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| 408 | if (! strcmp(retnotice.z_message, ZSRVACK_SENT)) |
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| 409 | { |
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| 410 | ZFreeNotice(&retnotice); |
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| 411 | return(SUCCESS); /* Message made it */ |
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| 412 | } |
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| 413 | else |
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| 414 | { |
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| 415 | #ifdef TEST |
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| 416 | printf("zsend: unknown error sending Zephyr message"); |
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| 417 | #endif |
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| 418 | ZFreeNotice(&retnotice); |
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| 419 | return(ERROR); /* Some error, probably not using Zephyr */ |
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| 420 | } |
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| 421 | } |
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| 422 | |
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| 423 | |
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| 424 | |
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| 425 | #endif ZEPHYR |
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| 426 | |
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| 427 | /* |
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| 428 | * Function: perror() similar to that of the C library, except that |
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| 429 | * a datestamp precedes the message printed. |
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| 430 | * Arguments: msg: Message to print. |
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| 431 | * Returns: nothing |
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| 432 | * |
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| 433 | */ |
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| 434 | |
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| 435 | #include <sys/uio.h> |
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| 436 | extern int sys_nerr; |
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| 437 | extern char *sys_errlist[]; |
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| 438 | extern int errno; |
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| 439 | static char time_buf[20]; |
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| 440 | |
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| 441 | perror(msg) |
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| 442 | char *msg; |
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| 443 | { |
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| 444 | register int error_number; |
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| 445 | struct iovec iov[6]; |
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| 446 | register struct iovec *v = iov; |
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| 447 | |
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| 448 | error_number = errno; |
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| 449 | |
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| 450 | time_now(time_buf); |
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| 451 | v->iov_base = time_buf; |
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| 452 | v->iov_len = strlen(time_buf); |
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| 453 | v++; |
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| 454 | |
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| 455 | v->iov_base = " "; |
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| 456 | v->iov_len = 1; |
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| 457 | v++; |
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| 458 | |
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| 459 | if (msg) { |
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| 460 | if (*msg) { |
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| 461 | v->iov_base = msg; |
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| 462 | v->iov_len = strlen(msg); |
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| 463 | v++; |
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| 464 | v->iov_base = ": "; |
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| 465 | v->iov_len = 2; |
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| 466 | v++; |
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| 467 | } |
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| 468 | } |
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| 469 | |
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| 470 | if (error_number < sys_nerr) |
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| 471 | v->iov_base = sys_errlist[error_number]; |
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| 472 | else |
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| 473 | v->iov_base = "Unknown error"; |
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| 474 | v->iov_len = strlen(v->iov_base); |
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| 475 | v++; |
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| 476 | |
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| 477 | v->iov_base = "\n"; |
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| 478 | v->iov_len = 1; |
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| 479 | (void) writev(2, iov, (v - iov) + 1); |
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| 480 | } |
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