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/*
getpeername.c, part of
faucet and hose: network pipe utilities
Copyright (C) 1995-98 Robert Forsman
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
static char info[] = "getpeername: a network utility for sockets\nWritten 1995-98 by Robert Forsman <thoth@cis.ufl.edu>\n";
#include <stdio.h>
#include <string.h>
#include <errno.h>
extern int errno; /* I hate the errno header file */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifndef NOUNIXSOCKETS
#include <sys/un.h>
#endif
#include <netinet/in.h>
#include <netdb.h>
#include "common.h"
void usage()
{
fprintf(stderr, "Usage: %s [ -verbose ] [ fd# ]\n", progname);
}
int getpeername();
int getsockname();
int main(argc, argv)
int argc;
char **argv;
{
int i;
int peer_not_sock = 1;
int fd = 0; /* assume socket is attached to stdin.
(if it's attached to stdout, our
output will go over the socket) */
int verbose=0;
set_progname(argv[0]);
if (0==strcmp(progname + strlen(progname) - 11, "getsockname") &&
(strlen(progname)<12 || progname[strlen(progname)-12] == '/'))
peer_not_sock = 0;
for (i=1; i<argc; i++) {
char *name = argv[i];
while( *name && *name=='-' )
++name;
if (0==strncmp(name, "verbose", strlen(name))) {
verbose++;
} else if (0==strncmp(name, "sock", strlen(name))) {
peer_not_sock=0;
} else if (0==strncmp(name, "peer", strlen(name))) {
peer_not_sock=1;
} else {
break;
}
}
if (i<argc) {
fd = atoi(argv[i++]);
}
if (i<argc) {
fprintf(stderr, "Too many arguments\n");
usage();
exit(1);
}
if (verbose>1) {
emit_version("getpeername", 1995);
}
{
union {
struct sockaddr_storage base;
struct sockaddr_in in;
struct sockaddr_in6 in6;
#ifndef NOUNIXSOCKETS
struct sockaddr_un un;
#endif
} saddr;
struct sockaddr_in *sinp = &saddr.in;
struct sockaddr_in6 *sin6p = &saddr.in6;
#ifndef NOUNIXSOCKETS
struct sockaddr_un *sunp = &saddr.un;
#endif
int saddrlen = sizeof(saddr);
int (*f)();
char *name;
if (peer_not_sock) {
f = getpeername;
name = "peer";
} else {
f = getsockname;
name = "sock";
}
memset(&saddr, 0, sizeof(saddr));
if (0!= f(fd, &saddr, &saddrlen)) {
fprintf(stderr, "%s: get%sname failed on descriptor %d: ", progname, name, fd);
perror("");
exit(1);
}
#ifndef NOUNIXSOCKETS
if (saddr.base.ss_family == AF_UNIX) {
if (verbose)
printf("UNIX, path ");
printf("%s\n", (*sunp->sun_path == '\0') ? "(abstract)"
: (*sunp->sun_path == '/') ? sunp->sun_path
: "(unnamed)");
} else
#endif
if (saddr.base.ss_family == AF_INET ||
saddr.base.ss_family == AF_INET6) {
const int is_inet6 = ( saddr.base.ss_family == AF_INET6 );
if (verbose)
printf("Internet, port ");
printf("%d\n", ntohs( is_inet6 ? sin6p->sin6_port
: sinp->sin_port));
if (verbose)
printf("Host ");
{
char ip[INET6_ADDRSTRLEN];
getnameinfo((struct sockaddr *) &saddr.base,
sizeof(struct sockaddr_storage),
ip, sizeof(ip), NULL, 0, NI_NUMERICHOST);
printf("%s%s", ip, verbose ? " " : "\n");
}
if (verbose) {
char host[NI_MAXHOST];
getnameinfo((struct sockaddr *) &saddr.base,
sizeof(struct sockaddr_storage),
host, sizeof(host), NULL, 0, 0);
printf("%s\n", host);
}
} else {
fprintf(stderr, "%s: unknown address family (%d) returned by get%sname\n", progname, saddr.base.ss_family, name);
}
}
return 0;
}
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