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/*++
/* NAME
/* inet_addr_host 3
/* SUMMARY
/* determine all host internet interface addresses
/* SYNOPSIS
/* #include <inet_addr_host.h>
/*
/* int inet_addr_host(addr_list, hostname)
/* INET_ADDR_LIST *addr_list;
/* const char *hostname;
/* DESCRIPTION
/* inet_addr_host() determines all interface addresses of the
/* named host. The host may be specified as a symbolic name,
/* or as a numerical address. An empty host expands as the
/* wild-card address. Address results are appended to
/* the specified address list. The result value is the number
/* of addresses appended to the list.
/* DIAGNOSTICS
/* Fatal errors: out of memory.
/* BUGS
/* This code uses the name service, so it talks to the network,
/* and that may not be desirable.
/* SEE ALSO
/* inet_addr_list(3) address list management
/* 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 library. */
#include <sys_defs.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Utility library. */
#include <mymalloc.h>
#include <inet_addr_list.h>
#include <inet_addr_host.h>
#include <myaddrinfo.h>
#include <sock_addr.h>
#include <inet_proto.h>
#include <msg.h>
/* inet_addr_host - look up address list for host */
int inet_addr_host(INET_ADDR_LIST *addr_list, const char *hostname)
{
const char *myname = "inet_addr_host";
int sock;
struct addrinfo *res0;
struct addrinfo *res;
int aierr;
ssize_t hostnamelen;
const char *hname;
const char *serv;
int initial_count = addr_list->used;
const INET_PROTO_INFO *proto_info;
/*
* The use of square brackets around an IPv6 addresses is required, even
* though we don't enforce it as it'd make the code unnecessarily
* complicated.
*
* XXX AIX 5.1 getaddrinfo() does not allow "0" as service, regardless of
* whether or not a host is specified.
*/
if (*hostname == 0) {
hname = 0;
serv = "1";
} else if (*hostname == '['
&& hostname[(hostnamelen = strlen(hostname)) - 1] == ']') {
hname = mystrndup(hostname + 1, hostnamelen - 2);
serv = 0;
} else {
hname = hostname;
serv = 0;
}
proto_info = inet_proto_info();
if ((aierr = hostname_to_sockaddr(hname, serv, SOCK_STREAM, &res0)) == 0) {
for (res = res0; res; res = res->ai_next) {
/*
* Safety net.
*/
if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) {
msg_info("%s: skipping address family %d for host \"%s\"",
myname, res->ai_family, hostname);
continue;
}
/*
* On Linux systems it is not unusual for user-land to be out of
* sync with kernel-land. When this is the case we try to be
* helpful and filter out address families that the library
* claims to understand but that are not supported by the kernel.
*/
if ((sock = socket(res->ai_family, SOCK_STREAM, 0)) < 0) {
msg_warn("%s: skipping address family %d: %m",
myname, res->ai_family);
continue;
}
if (close(sock))
msg_warn("%s: close socket: %m", myname);
inet_addr_list_append(addr_list, res->ai_addr);
}
freeaddrinfo(res0);
}
if (hname && hname != hostname)
myfree((void *) hname);
return (addr_list->used - initial_count);
}
#ifdef TEST
#include <msg.h>
#include <vstream.h>
#include <msg_vstream.h>
#include <sock_addr.h>
int main(int argc, char **argv)
{
INET_ADDR_LIST list;
struct sockaddr_storage *sa;
MAI_HOSTADDR_STR hostaddr;
INET_PROTO_INFO *proto_info;
msg_vstream_init(argv[0], VSTREAM_ERR);
if (argc < 3)
msg_fatal("usage: %s protocols hostname...", argv[0]);
proto_info = inet_proto_init(argv[0], argv[1]);
argv += 1;
while (--argc && *++argv) {
inet_addr_list_init(&list);
if (inet_addr_host(&list, *argv) == 0)
msg_fatal("not found: %s", *argv);
for (sa = list.addrs; sa < list.addrs + list.used; sa++) {
SOCKADDR_TO_HOSTADDR(SOCK_ADDR_PTR(sa), SOCK_ADDR_LEN(sa),
&hostaddr, (MAI_SERVPORT_STR *) 0, 0);
vstream_printf("%s\t%s\n", *argv, hostaddr.buf);
}
vstream_fflush(VSTREAM_OUT);
inet_addr_list_free(&list);
}
return (0);
}
#endif
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