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/*++
/* NAME
/* find_inet 3
/* SUMMARY
/* inet-domain name services
/* SYNOPSIS
/* #include <find_inet.h>
/*
/* unsigned find_inet_addr(host)
/* const char *host;
/*
/* int find_inet_port(port, proto)
/* const char *port;
/* const char *proto;
/* DESCRIPTION
/* These functions translate network address information from
/* between printable form to the internal the form used by the
/* BSD TCP/IP network software.
/*
/* find_inet_addr() translates a symbolic or numerical hostname.
/* This function is deprecated. Use hostname_to_hostaddr() instead.
/*
/* find_inet_port() translates a symbolic or numerical port name.
/* BUGS
/* find_inet_addr() ignores all but the first address listed for
/* a symbolic hostname.
/* DIAGNOSTICS
/* Lookup and conversion errors are fatal.
/* 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
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
/* Application-specific. */
#include "msg.h"
#include "stringops.h"
#include "find_inet.h"
#include "known_tcp_ports.h"
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
#ifdef TEST
extern NORETURN PRINTFLIKE(1, 2) test_msg_fatal(const char *,...);
#define msg_fatal test_msg_fatal
#endif
/* find_inet_addr - translate numerical or symbolic host name */
unsigned find_inet_addr(const char *host)
{
struct in_addr addr;
struct hostent *hp;
addr.s_addr = inet_addr(host);
if ((addr.s_addr == INADDR_NONE) || (addr.s_addr == 0)) {
if ((hp = gethostbyname(host)) == 0)
msg_fatal("host not found: %s", host);
if (hp->h_addrtype != AF_INET)
msg_fatal("unexpected address family: %d", hp->h_addrtype);
if (hp->h_length != sizeof(addr))
msg_fatal("unexpected address length %d", hp->h_length);
memcpy((void *) &addr, hp->h_addr, hp->h_length);
}
return (addr.s_addr);
}
/* find_inet_port - translate numerical or symbolic service name */
int find_inet_port(const char *service, const char *protocol)
{
struct servent *sp;
int port;
service = filter_known_tcp_port(service);
if (alldig(service) && (port = atoi(service)) != 0) {
if (port < 0 || port > 65535)
msg_fatal("bad port number: %s", service);
return (htons(port));
} else {
if ((sp = getservbyname(service, protocol)) == 0)
msg_fatal("unknown service: %s/%s", service, protocol);
return (sp->s_port);
}
}
#ifdef TEST
#include <stdlib.h>
#include <setjmp.h>
#include <string.h>
#include <vstream.h>
#include <vstring.h>
#include <msg_vstream.h>
#define STR(x) vstring_str(x)
/* TODO(wietse) make this a proper VSTREAM interface */
/* vstream_swap - kludge to capture output for testing */
static void vstream_swap(VSTREAM *one, VSTREAM *two)
{
VSTREAM save;
save = *one;
*one = *two;
*two = save;
}
jmp_buf test_fatal_jbuf;
#undef msg_fatal
/* test_msg_fatal - does not return, and does not terminate */
void test_msg_fatal(const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
vmsg_warn(fmt, ap);
va_end(ap);
longjmp(test_fatal_jbuf, 1);
}
struct association {
const char *lhs; /* service name */
const char *rhs; /* service port */
};
struct test_case {
const char *label; /* identifies test case */
struct association associations[10];
const char *service;
const char *proto;
const char *exp_warning; /* expected error */
int exp_hport; /* expected port, host byte order */
};
struct test_case test_cases[] = {
{"good-symbolic",
/* association */ {{"foobar", "25252"}, 0},
/* service */ "foobar",
/* proto */ "tcp",
/* exp_warning */ "",
/* exp_hport */ 25252,
},
{"good-numeric",
/* association */ {{"foobar", "25252"}, 0},
/* service */ "25252",
/* proto */ "tcp",
/* exp_warning */ "",
/* exp_hport */ 25252,
},
{"bad-symbolic",
/* association */ {{"foobar", "25252"}, 0},
/* service */ "an-impossible-name",
/* proto */ "tcp",
/* exp_warning */ "find_inet: warning: unknown service: an-impossible-name/tcp\n",
},
{"bad-numeric",
/* association */ {{"foobar", "25252"}, 0},
/* service */ "123456",
/* proto */ "tcp",
/* exp_warning */ "find_inet: warning: bad port number: 123456\n",
},
};
int main(int argc, char **argv) {
struct test_case *tp;
struct association *ap;
int pass = 0;
int fail = 0;
const char *err;
int test_failed;
int nport;
VSTRING *msg_buf;
VSTREAM *memory_stream;
msg_vstream_init("find_inet", VSTREAM_ERR);
msg_buf = vstring_alloc(100);
for (tp = test_cases; tp->label != 0; tp++) {
test_failed = 0;
VSTRING_RESET(msg_buf);
VSTRING_TERMINATE(msg_buf);
clear_known_tcp_ports();
for (err = 0, ap = tp->associations; err == 0 && ap->lhs != 0; ap++)
err = add_known_tcp_port(ap->lhs, ap->rhs);
if (err != 0) {
msg_warn("test case %s: got err: \"%s\"", tp->label, err);
test_failed = 1;
} else {
if ((memory_stream = vstream_memopen(msg_buf, O_WRONLY)) == 0)
msg_fatal("open memory stream: %m");
vstream_swap(VSTREAM_ERR, memory_stream);
if (setjmp(test_fatal_jbuf) == 0)
nport = find_inet_port(tp->service, tp->proto);
vstream_swap(memory_stream, VSTREAM_ERR);
if (vstream_fclose(memory_stream))
msg_fatal("close memory stream: %m");
if (strcmp(STR(msg_buf), tp->exp_warning) != 0) {
msg_warn("test case %s: got error: \"%s\", want: \"%s\"",
tp->label, STR(msg_buf), tp->exp_warning);
test_failed = 1;
} else if (tp->exp_warning[0] == 0) {
if (ntohs(nport) != tp->exp_hport) {
msg_warn("test case %s: got port \"%d\", want: \"%d\"",
tp->label, ntohs(nport), tp->exp_hport);
test_failed = 1;
}
}
}
if (test_failed) {
msg_info("%s: FAIL", tp->label);
fail++;
} else {
msg_info("%s: PASS", tp->label);
pass++;
}
}
msg_info("PASS=%d FAIL=%d", pass, fail);
vstring_free(msg_buf);
exit(fail != 0);
}
#endif
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