/*++ /* 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> /* 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((char *) &sin.sin_addr, hp->h_addr_list[0], hp->h_length); } /* * Open a socket, or re-use an existing one. */ if (sock < 0 && (sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { msg_warn("socket: %m"); return; } /* * Biff! */ if (sendto(sock, text, len, 0, (struct sockaddr *) & sin, sizeof(sin)) != len) msg_warn("biff_notify: %m"); }