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