1 /* $NetBSD: biff_notify.c,v 1.2 2017/02/14 01:16:45 christos Exp $ */
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 #include <iostuff.h>
49
50 /* Application-specific. */
51
52 #include <biff_notify.h>
53
54 /* biff_notify - notify recipient via the biff "protocol" */
55
biff_notify(const char * text,ssize_t len)56 void biff_notify(const char *text, ssize_t len)
57 {
58 static struct sockaddr_in sin;
59 static int sock = -1;
60 struct hostent *hp;
61 struct servent *sp;
62
63 /*
64 * Initialize a socket address structure, or re-use an existing one.
65 */
66 if (sin.sin_family == 0) {
67 if ((sp = getservbyname("biff", "udp")) == 0) {
68 msg_warn("service not found: biff/udp");
69 return;
70 }
71 if ((hp = gethostbyname("localhost")) == 0) {
72 msg_warn("host not found: localhost");
73 return;
74 }
75 if ((int) hp->h_length > (int) sizeof(sin.sin_addr)) {
76 msg_warn("bad address size %d for localhost", hp->h_length);
77 return;
78 }
79 sin.sin_family = hp->h_addrtype;
80 sin.sin_port = sp->s_port;
81 memcpy((void *) &sin.sin_addr, hp->h_addr_list[0], hp->h_length);
82 }
83
84 /*
85 * Open a socket, or re-use an existing one.
86 */
87 if (sock < 0) {
88 if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
89 msg_warn("socket: %m");
90 return;
91 }
92 close_on_exec(sock, CLOSE_ON_EXEC);
93 }
94
95 /*
96 * Biff!
97 */
98 if (sendto(sock, text, len, 0, (struct sockaddr *) &sin, sizeof(sin)) != len)
99 msg_warn("biff_notify: %m");
100 }
101