external/ibm-public/postfix/dist/src/local/biff_notify.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      biff_notify 3
   6 /* SUMMARY
   7 /*      send biff notification
   8 /* SYNOPSIS
   9 /*      #include <biff_notify.h>
  10 /*
  11 /*      void    biff_notify(text, len)
  12 /*      const char *text;
  13 /*      ssize_t len;
  14 /* DESCRIPTION
  15 /*      biff_notify() sends a \fBBIFF\fR notification request to the
  16 /*      \fBcomsat\fR daemon.
  17 /*
  18 /*      Arguments:
  19 /* .IP text
  20 /*      Null-terminated text (username@mailbox-offset).
  21 /* .IP len
  22 /*      Length of text, including null terminator.
  23 /* BUGS
  24 /*      The \fBBIFF\fR "service" can be a noticeable load for
  25 /*      systems that have many logged-in users.
  26 /* LICENSE
  27 /* .ad
  28 /* .fi
  29 /*      The Secure Mailer license must be distributed with this software.
  30 /* AUTHOR(S)
  31 /*      Wietse Venema
  32 /*      IBM T.J. Watson Research
  33 /*      P.O. Box 704
  34 /*      Yorktown Heights, NY 10598, USA
  35 /*--*/
  36
  37 /* System library. */
  38
  39 #include "sys_defs.h"
  40 #include <sys/socket.h>
  41 #include <netinet/in.h>
  42 #include <netdb.h>
  43 #include <string.h>
  44
  45 /* Utility library. */
  46
  47 #include <msg.h>
  48
  49 /* Application-specific. */
  50
  51 #include <biff_notify.h>
  52
  53 /* biff_notify - notify recipient via the biff "protocol" */
  54
  55 void    biff_notify(const char *text, ssize_t len)
  56 {
  57     static struct sockaddr_in sin;
  58     static int sock = -1;
  59     struct hostent *hp;
  60     struct servent *sp;
  61
  62     /*
  63      * Initialize a socket address structure, or re-use an existing one.
  64      */
  65     if (sin.sin_family == 0) {
  66         if ((sp = getservbyname("biff", "udp")) == 0) {
  67             msg_warn("service not found: biff/udp");
  68             return;
  69         }
  70         if ((hp = gethostbyname("localhost")) == 0) {
  71             msg_warn("host not found: localhost");
  72             return;
  73         }
  74         if ((int) hp->h_length > (int) sizeof(sin.sin_addr)) {
  75             msg_warn("bad address size %d for localhost", hp->h_length);
  76             return;
  77         }
  78         sin.sin_family = hp->h_addrtype;
  79         sin.sin_port = sp->s_port;
  80         memcpy((char *) &sin.sin_addr, hp->h_addr_list[0], hp->h_length);
  81     }
  82
  83     /*
  84      * Open a socket, or re-use an existing one.
  85      */
  86     if (sock < 0 && (sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  87         msg_warn("socket: %m");
  88         return;
  89     }
  90
  91     /*
  92      * Biff!
  93      */
  94     if (sendto(sock, text, len, 0, (struct sockaddr *) & sin, sizeof(sin)) != len)
  95         msg_warn("biff_notify: %m");
  96 }