114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
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/*++
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/* NAME
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/* peer_name 3
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/* SUMMARY
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/* produce printable peer name and address
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/* SYNOPSIS
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/* #include <peer_name.h>
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/*
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/* typedef struct {
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/* .in +4
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/* int type;
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/* char name;
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/* char addr;
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/* .in -4
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/* } PEER_NAME;
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/*
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/* PEER_NAME *peer_name(sock)
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/* int sock;
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/* DESCRIPTION
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/* The \fIpeer_name\fR() routine attempts to produce a printable
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/* version of the peer name and address of the specified socket.
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/* The result is in static memory that will be overwritten.
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/* Make a copy if the result is to be used for an appreciable
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/* amount of time.
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/*
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/* Where information is unavailable, the name and/or address
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/* are set to "unknown".
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/* The \fItype\fR result field specifies how the name and address
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/* should be interpreted:
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/* .IP PEER_TYPE_INET
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/* The socket specifies a TCP/IP endpoint.
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/* The result is a hostname (from the DNS, a local hosts file or
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/* other); the address a dotted quad.
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/* .IP PEER_TYPE_LOCAL
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/* The socket argument specifies a local transport.
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/* The result name is "localhost"; the result address is "127.0.0.1".
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/* .IP PEER_TYPE_UNKNOWN
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/* The socket argument does not specify a socket.
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/* The result name is "localhost"; the result address is "127.0.0.1".
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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/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netdb.h>
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/* Utility library. */
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#include <msg.h>
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#include <valid_hostname.h>
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#include <peer_name.h>
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/* peer_name - produce printable peer name and address */
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PEER_NAME *peer_name(int sock)
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{
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static PEER_NAME peer;
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struct sockaddr_in sin;
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SOCKADDR_SIZE len = sizeof(sin);
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struct hostent *hp;
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if (getpeername(sock, (struct sockaddr *) & sin, &len) == 0) {
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switch (sin.sin_family) {
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case AF_INET:
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peer.type = PEER_TYPE_INET;
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hp = gethostbyaddr((char *) &(sin.sin_addr),
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sizeof(sin.sin_addr), AF_INET);
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peer.name = (hp && valid_hostname(hp->h_name) ?
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hp->h_name : "unknown");
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peer.addr = inet_ntoa(sin.sin_addr);
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return (&peer);
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case AF_UNSPEC:
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case AF_UNIX:
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peer.type = PEER_TYPE_LOCAL;
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peer.name = "localhost";
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peer.addr = "127.0.0.1";
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return (&peer);
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}
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}
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peer.type = PEER_TYPE_UNKNOWN;
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peer.name = "localhost";
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peer.addr = "127.0.0.1";
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return (&peer);
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}
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#ifdef TEST
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#include <unistd.h>
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int main(int unused_argc, char **unused_argv)
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{
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PEER_NAME *peer;
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peer = peer_name(STDIN_FILENO);
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msg_info("name %s addr %s", peer->name, peer->addr);
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}
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#endif
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