95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*++
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/* NAME
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/* biff_notify 3
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/* SUMMARY
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/* send biff notification
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/* SYNOPSIS
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/* #include <biff_notify.h>
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/*
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/* void biff_notify(text, len)
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/* const char *text;
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/* int len;
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/* DESCRIPTION
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/* biff_notify() sends a \fBBIFF\fR notification request to the
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/* \fBcomsat\fR daemon.
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/*
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/* Arguments:
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/* .IP text
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/* Null-terminated text (username@mailbox-offset).
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/* .IP len
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/* Length of text, including null terminator.
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/* BUGS
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/* The \fBBIFF\fR "service" can be a noticeable load for
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/* systems that have many logged-in users.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include "sys_defs.h"
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <string.h>
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/* Utility library. */
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#include <msg.h>
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/* Application-specific. */
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#include <biff_notify.h>
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/* biff_notify - notify recipient via the biff "protocol" */
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void biff_notify(const char *text, int len)
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{
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static struct sockaddr_in sin;
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static int sock = -1;
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struct hostent *hp;
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struct servent *sp;
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/*
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* Initialize a socket address structure, or re-use an existing one.
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*/
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if (sin.sin_family == 0) {
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if ((sp = getservbyname("biff", "udp")) == 0) {
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msg_warn("service not found: biff/udp");
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return;
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}
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if ((hp = gethostbyname("localhost")) == 0) {
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msg_warn("host not found: localhost");
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return;
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}
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if ((int) hp->h_length > (int) sizeof(sin.sin_addr)) {
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msg_warn("bad address size %d for localhost", hp->h_length);
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return;
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}
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sin.sin_family = hp->h_addrtype;
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sin.sin_port = sp->s_port;
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memcpy((char *) &sin.sin_addr, hp->h_addr_list[0], hp->h_length);
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}
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/*
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* Open a socket, or re-use an existing one.
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*/
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if (sock < 0 && (sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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msg_warn("socket: %m");
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return;
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}
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/*
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* Biff!
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*/
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if (sendto(sock, text, len, 0, (struct sockaddr *) & sin, sizeof(sin)) != len)
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msg_warn("biff_notify: %m");
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}
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