busybox/libbb/xconnect.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Connect to host at port using address resolution from getaddrinfo
 *
 */

#include <netinet/in.h>
#include <net/if.h>
#include "libbb.h"

void FAST_FUNC setsockopt_reuseaddr(int fd)
{
	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
}
int FAST_FUNC setsockopt_broadcast(int fd)
{
	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
}
int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
{
	int r;
	struct ifreq ifr;
	strncpy(ifr.ifr_name, iface, IFNAMSIZ);
	/* Actually, ifr_name is at offset 0, and in practice
	 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
	 * But just in case it's not true on some obscure arch... */
	r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
	if (r)
		bb_perror_msg("can't bind to interface %s", iface);
	return r;
}


void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
{
	if (connect(s, s_addr, addrlen) < 0) {
		if (ENABLE_FEATURE_CLEAN_UP)
			close(s);
		if (s_addr->sa_family == AF_INET)
			bb_perror_msg_and_die("%s (%s)",
				"cannot connect to remote host",
				inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
		bb_perror_msg_and_die("cannot connect to remote host");
	}
}

/* Return port number for a service.
 * If "port" is a number use it as the port.
 * If "port" is a name it is looked up in /etc/services, if it isnt found return
 * default_port */
unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
{
	unsigned port_nr = default_port;
	if (port) {
		int old_errno;

		/* Since this is a lib function, we're not allowed to reset errno to 0.
		 * Doing so could break an app that is deferring checking of errno. */
		old_errno = errno;
		port_nr = bb_strtou(port, NULL, 10);
		if (errno || port_nr > 65535) {
			struct servent *tserv = getservbyname(port, protocol);
			port_nr = default_port;
			if (tserv)
				port_nr = ntohs(tserv->s_port);
		}
		errno = old_errno;
	}
	return (uint16_t)port_nr;
}


/* "Old" networking API - only IPv4 */

/*
void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
{
	struct hostent *he;

	memset(s_in, 0, sizeof(struct sockaddr_in));
	s_in->sin_family = AF_INET;
	he = xgethostbyname(host);
	memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
}


int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
{
	int s = xsocket(AF_INET, SOCK_STREAM, 0);
	xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
	return s;
}
*/

/* "New" networking API */


int FAST_FUNC get_nport(const struct sockaddr *sa)
{
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET6) {
		return ((struct sockaddr_in6*)sa)->sin6_port;
	}
#endif
	if (sa->sa_family == AF_INET) {
		return ((struct sockaddr_in*)sa)->sin_port;
	}
	/* What? UNIX socket? IPX?? :) */
	return -1;
}

void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
{
#if ENABLE_FEATURE_IPV6
	if (lsa->u.sa.sa_family == AF_INET6) {
		lsa->u.sin6.sin6_port = port;
		return;
	}
#endif
	if (lsa->u.sa.sa_family == AF_INET) {
		lsa->u.sin.sin_port = port;
		return;
	}
	/* What? UNIX socket? IPX?? :) */
}

/* We hijack this constant to mean something else */
/* It doesn't hurt because we will remove this bit anyway */
#define DIE_ON_ERROR AI_CANONNAME

/* host: "1.2.3.4[:port]", "www.google.com[:port]"
 * port: if neither of above specifies port # */
static len_and_sockaddr* str2sockaddr(
		const char *host, int port,
USE_FEATURE_IPV6(sa_family_t af,)
		int ai_flags)
{
	int rc;
	len_and_sockaddr *r = NULL;
	struct addrinfo *result = NULL;
	struct addrinfo *used_res;
	const char *org_host = host; /* only for error msg */
	const char *cp;
	struct addrinfo hint;

	/* Ugly parsing of host:addr */
	if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
		/* Even uglier parsing of [xx]:nn */
		host++;
		cp = strchr(host, ']');
		if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */
			bb_error_msg("bad address '%s'", org_host);
			if (ai_flags & DIE_ON_ERROR)
				xfunc_die();
			return NULL;
		}
	} else {
		cp = strrchr(host, ':');
		if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
			/* There is more than one ':' (e.g. "::1") */
			cp = NULL; /* it's not a port spec */
		}
	}
	if (cp) { /* points to ":" or "]:" */
		int sz = cp - host + 1;
		host = safe_strncpy(alloca(sz), host, sz);
		if (ENABLE_FEATURE_IPV6 && *cp != ':')
			cp++; /* skip ']' */
		cp++; /* skip ':' */
		port = bb_strtou(cp, NULL, 10);
		if (errno || (unsigned)port > 0xffff) {
			bb_error_msg("bad port spec '%s'", org_host);
			if (ai_flags & DIE_ON_ERROR)
				xfunc_die();
			return NULL;
		}
	}

	memset(&hint, 0 , sizeof(hint));
#if !ENABLE_FEATURE_IPV6
	hint.ai_family = AF_INET; /* do not try to find IPv6 */
#else
	hint.ai_family = af;
#endif
	/* Needed. Or else we will get each address thrice (or more)
	 * for each possible socket type (tcp,udp,raw...): */
	hint.ai_socktype = SOCK_STREAM;
	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
	rc = getaddrinfo(host, NULL, &hint, &result);
	if (rc || !result) {
		bb_error_msg("bad address '%s'", org_host);
		if (ai_flags & DIE_ON_ERROR)
			xfunc_die();
		goto ret;
	}
	used_res = result;
#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
	while (1) {
		if (used_res->ai_family == AF_INET)
			break;
		used_res = used_res->ai_next;
		if (!used_res) {
			used_res = result;
			break;
		}
	}
#endif
	r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
	r->len = used_res->ai_addrlen;
	memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
	set_nport(r, htons(port));
 ret:
	freeaddrinfo(result);
	return r;
}
#if !ENABLE_FEATURE_IPV6
#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
#endif

#if ENABLE_FEATURE_IPV6
len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
{
	return str2sockaddr(host, port, af, 0);
}

len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
{
	return str2sockaddr(host, port, af, DIE_ON_ERROR);
}
#endif

len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, 0);
}

len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
}

len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
{
	return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
}

#undef xsocket_type
int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
{
	SKIP_FEATURE_IPV6(enum { family = AF_INET };)
	len_and_sockaddr *lsa;
	int fd;
	int len;

#if ENABLE_FEATURE_IPV6
	if (family == AF_UNSPEC) {
		fd = socket(AF_INET6, sock_type, 0);
		if (fd >= 0) {
			family = AF_INET6;
			goto done;
		}
		family = AF_INET;
	}
#endif
	fd = xsocket(family, sock_type, 0);
	len = sizeof(struct sockaddr_in);
#if ENABLE_FEATURE_IPV6
	if (family == AF_INET6) {
 done:
		len = sizeof(struct sockaddr_in6);
	}
#endif
	lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
	lsa->len = len;
	lsa->u.sa.sa_family = family;
	*lsap = lsa;
	return fd;
}

int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
{
	return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
}

static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
{
	int fd;
	len_and_sockaddr *lsa;

	if (bindaddr && bindaddr[0]) {
		lsa = xdotted2sockaddr(bindaddr, port);
		/* user specified bind addr dictates family */
		fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
	} else {
		fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
		set_nport(lsa, htons(port));
	}
	setsockopt_reuseaddr(fd);
	xbind(fd, &lsa->u.sa, lsa->len);
	free(lsa);
	return fd;
}

int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
{
	return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
}

int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
{
	return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
}


int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
{
	int fd;
	len_and_sockaddr *lsa;

	lsa = xhost2sockaddr(peer, port);
	fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
	setsockopt_reuseaddr(fd);
	xconnect(fd, &lsa->u.sa, lsa->len);
	free(lsa);
	return fd;
}

int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
{
	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
	xconnect(fd, &lsa->u.sa, lsa->len);
	return fd;
}

/* We hijack this constant to mean something else */
/* It doesn't hurt because we will add this bit anyway */
#define IGNORE_PORT NI_NUMERICSERV
static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
{
	char host[128];
	char serv[16];
	int rc;
	socklen_t salen;

	salen = LSA_SIZEOF_SA;
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET)
		salen = sizeof(struct sockaddr_in);
	if (sa->sa_family == AF_INET6)
		salen = sizeof(struct sockaddr_in6);
#endif
	rc = getnameinfo(sa, salen,
			host, sizeof(host),
	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
			serv, sizeof(serv),
			/* do not resolve port# into service _name_ */
			flags | NI_NUMERICSERV
	);
	if (rc)
		return NULL;
	if (flags & IGNORE_PORT)
		return xstrdup(host);
#if ENABLE_FEATURE_IPV6
	if (sa->sa_family == AF_INET6) {
		if (strchr(host, ':')) /* heh, it's not a resolved hostname */
			return xasprintf("[%s]:%s", host, serv);
		/*return xasprintf("%s:%s", host, serv);*/
		/* - fall through instead */
	}
#endif
	/* For now we don't support anything else, so it has to be INET */
	/*if (sa->sa_family == AF_INET)*/
		return xasprintf("%s:%s", host, serv);
	/*return xstrdup(host);*/
}

char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
{
	return sockaddr2str(sa, 0);
}

char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, IGNORE_PORT);
}

char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
}
char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NUMERICHOST);
}

char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
{
	return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Utility routines.
4	*
5	* Connect to host at port using address resolution from getaddrinfo
6	*
7	*/
8
9	#include <netinet/in.h>
10	#include <net/if.h>
11	#include "libbb.h"
12
13	void FAST_FUNC setsockopt_reuseaddr(int fd)
14	{
15	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
16	}
17	int FAST_FUNC setsockopt_broadcast(int fd)
18	{
19	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
20	}
21	int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
22	{
23	int r;
24	struct ifreq ifr;
25	strncpy(ifr.ifr_name, iface, IFNAMSIZ);
26	/* Actually, ifr_name is at offset 0, and in practice
27	* just giving char[IFNAMSIZ] instead of struct ifreq works too.
28	* But just in case it's not true on some obscure arch... */
29	r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
30	if (r)
31	bb_perror_msg("can't bind to interface %s", iface);
32	return r;
33	}
34
35
36	void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
37	{
38	if (connect(s, s_addr, addrlen) < 0) {
39	if (ENABLE_FEATURE_CLEAN_UP)
40	close(s);
41	if (s_addr->sa_family == AF_INET)
42	bb_perror_msg_and_die("%s (%s)",
43	"cannot connect to remote host",
44	inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
45	bb_perror_msg_and_die("cannot connect to remote host");
46	}
47	}
48
49	/* Return port number for a service.
50	* If "port" is a number use it as the port.
51	* If "port" is a name it is looked up in /etc/services, if it isnt found return
52	* default_port */
53	unsigned FAST_FUNC bb_lookup_port(const char port, const char protocol, unsigned default_port)
54	{
55	unsigned port_nr = default_port;
56	if (port) {
57	int old_errno;
58
59	/* Since this is a lib function, we're not allowed to reset errno to 0.
60	* Doing so could break an app that is deferring checking of errno. */
61	old_errno = errno;
62	port_nr = bb_strtou(port, NULL, 10);
63	if (errno \|\| port_nr > 65535) {
64	struct servent *tserv = getservbyname(port, protocol);
65	port_nr = default_port;
66	if (tserv)
67	port_nr = ntohs(tserv->s_port);
68	}
69	errno = old_errno;
70	}
71	return (uint16_t)port_nr;
72	}
73
74
75	/* "Old" networking API - only IPv4 */
76
77	/*
78	void FAST_FUNC bb_lookup_host(struct sockaddr_in s_in, const char host)
79	{
80	struct hostent *he;
81
82	memset(s_in, 0, sizeof(struct sockaddr_in));
83	s_in->sin_family = AF_INET;
84	he = xgethostbyname(host);
85	memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
86	}
87
88
89	int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
90	{
91	int s = xsocket(AF_INET, SOCK_STREAM, 0);
92	xconnect(s, (struct sockaddr) s_addr, sizeof(s_addr));
93	return s;
94	}
95	*/
96
97	/* "New" networking API */
98
99
100	int FAST_FUNC get_nport(const struct sockaddr *sa)
101	{
102	#if ENABLE_FEATURE_IPV6
103	if (sa->sa_family == AF_INET6) {
104	return ((struct sockaddr_in6*)sa)->sin6_port;
105	}
106	#endif
107	if (sa->sa_family == AF_INET) {
108	return ((struct sockaddr_in*)sa)->sin_port;
109	}
110	/* What? UNIX socket? IPX?? :) */
111	return -1;
112	}
113
114	void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
115	{
116	#if ENABLE_FEATURE_IPV6
117	if (lsa->u.sa.sa_family == AF_INET6) {
118	lsa->u.sin6.sin6_port = port;
119	return;
120	}
121	#endif
122	if (lsa->u.sa.sa_family == AF_INET) {
123	lsa->u.sin.sin_port = port;
124	return;
125	}
126	/* What? UNIX socket? IPX?? :) */
127	}
128
129	/* We hijack this constant to mean something else */
130	/* It doesn't hurt because we will remove this bit anyway */
131	#define DIE_ON_ERROR AI_CANONNAME
132
133	/* host: "1.2.3.4[:port]", "www.google.com[:port]"
134	* port: if neither of above specifies port # */
135	static len_and_sockaddr* str2sockaddr(
136	const char *host, int port,
137	USE_FEATURE_IPV6(sa_family_t af,)
138	int ai_flags)
139	{
140	int rc;
141	len_and_sockaddr *r = NULL;
142	struct addrinfo *result = NULL;
143	struct addrinfo *used_res;
144	const char org_host = host; / only for error msg */
145	const char *cp;
146	struct addrinfo hint;
147
148	/* Ugly parsing of host:addr */
149	if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
150	/* Even uglier parsing of [xx]:nn */
151	host++;
152	cp = strchr(host, ']');
153	if (!cp \|\| cp[1] != ':') { /* Malformed: must have [xx]:nn */
154	bb_error_msg("bad address '%s'", org_host);
155	if (ai_flags & DIE_ON_ERROR)
156	xfunc_die();
157	return NULL;
158	}
159	} else {
160	cp = strrchr(host, ':');
161	if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
162	/* There is more than one ':' (e.g. "::1") */
163	cp = NULL; /* it's not a port spec */
164	}
165	}
166	if (cp) { /* points to ":" or "]:" */
167	int sz = cp - host + 1;
168	host = safe_strncpy(alloca(sz), host, sz);
169	if (ENABLE_FEATURE_IPV6 && *cp != ':')
170	cp++; /* skip ']' */
171	cp++; /* skip ':' */
172	port = bb_strtou(cp, NULL, 10);
173	if (errno \|\| (unsigned)port > 0xffff) {
174	bb_error_msg("bad port spec '%s'", org_host);
175	if (ai_flags & DIE_ON_ERROR)
176	xfunc_die();
177	return NULL;
178	}
179	}
180
181	memset(&hint, 0 , sizeof(hint));
182	#if !ENABLE_FEATURE_IPV6
183	hint.ai_family = AF_INET; /* do not try to find IPv6 */
184	#else
185	hint.ai_family = af;
186	#endif
187	/* Needed. Or else we will get each address thrice (or more)
188	* for each possible socket type (tcp,udp,raw...): */
189	hint.ai_socktype = SOCK_STREAM;
190	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
191	rc = getaddrinfo(host, NULL, &hint, &result);
192	if (rc \|\| !result) {
193	bb_error_msg("bad address '%s'", org_host);
194	if (ai_flags & DIE_ON_ERROR)
195	xfunc_die();
196	goto ret;
197	}
198	used_res = result;
199	#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
200	while (1) {
201	if (used_res->ai_family == AF_INET)
202	break;
203	used_res = used_res->ai_next;
204	if (!used_res) {
205	used_res = result;
206	break;
207	}
208	}
209	#endif
210	r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
211	r->len = used_res->ai_addrlen;
212	memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
213	set_nport(r, htons(port));
214	ret:
215	freeaddrinfo(result);
216	return r;
217	}
218	#if !ENABLE_FEATURE_IPV6
219	#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
220	#endif
221
222	#if ENABLE_FEATURE_IPV6
223	len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
224	{
225	return str2sockaddr(host, port, af, 0);
226	}
227
228	len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
229	{
230	return str2sockaddr(host, port, af, DIE_ON_ERROR);
231	}
232	#endif
233
234	len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
235	{
236	return str2sockaddr(host, port, AF_UNSPEC, 0);
237	}
238
239	len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
240	{
241	return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
242	}
243
244	len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
245	{
246	return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST \| DIE_ON_ERROR);
247	}
248
249	#undef xsocket_type
250	int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
251	{
252	SKIP_FEATURE_IPV6(enum { family = AF_INET };)
253	len_and_sockaddr *lsa;
254	int fd;
255	int len;
256
257	#if ENABLE_FEATURE_IPV6
258	if (family == AF_UNSPEC) {
259	fd = socket(AF_INET6, sock_type, 0);
260	if (fd >= 0) {
261	family = AF_INET6;
262	goto done;
263	}
264	family = AF_INET;
265	}
266	#endif
267	fd = xsocket(family, sock_type, 0);
268	len = sizeof(struct sockaddr_in);
269	#if ENABLE_FEATURE_IPV6
270	if (family == AF_INET6) {
271	done:
272	len = sizeof(struct sockaddr_in6);
273	}
274	#endif
275	lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
276	lsa->len = len;
277	lsa->u.sa.sa_family = family;
278	*lsap = lsa;
279	return fd;
280	}
281
282	int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
283	{
284	return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
285	}
286
287	static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
288	{
289	int fd;
290	len_and_sockaddr *lsa;
291
292	if (bindaddr && bindaddr[0]) {
293	lsa = xdotted2sockaddr(bindaddr, port);
294	/* user specified bind addr dictates family */
295	fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
296	} else {
297	fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
298	set_nport(lsa, htons(port));
299	}
300	setsockopt_reuseaddr(fd);
301	xbind(fd, &lsa->u.sa, lsa->len);
302	free(lsa);
303	return fd;
304	}
305
306	int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
307	{
308	return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
309	}
310
311	int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
312	{
313	return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
314	}
315
316
317	int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
318	{
319	int fd;
320	len_and_sockaddr *lsa;
321
322	lsa = xhost2sockaddr(peer, port);
323	fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
324	setsockopt_reuseaddr(fd);
325	xconnect(fd, &lsa->u.sa, lsa->len);
326	free(lsa);
327	return fd;
328	}
329
330	int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
331	{
332	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
333	xconnect(fd, &lsa->u.sa, lsa->len);
334	return fd;
335	}
336
337	/* We hijack this constant to mean something else */
338	/* It doesn't hurt because we will add this bit anyway */
339	#define IGNORE_PORT NI_NUMERICSERV
340	static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
341	{
342	char host[128];
343	char serv[16];
344	int rc;
345	socklen_t salen;
346
347	salen = LSA_SIZEOF_SA;
348	#if ENABLE_FEATURE_IPV6
349	if (sa->sa_family == AF_INET)
350	salen = sizeof(struct sockaddr_in);
351	if (sa->sa_family == AF_INET6)
352	salen = sizeof(struct sockaddr_in6);
353	#endif
354	rc = getnameinfo(sa, salen,
355	host, sizeof(host),
356	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
357	serv, sizeof(serv),
358	/* do not resolve port# into service _name_ */
359	flags \| NI_NUMERICSERV
360	);
361	if (rc)
362	return NULL;
363	if (flags & IGNORE_PORT)
364	return xstrdup(host);
365	#if ENABLE_FEATURE_IPV6
366	if (sa->sa_family == AF_INET6) {
367	if (strchr(host, ':')) /* heh, it's not a resolved hostname */
368	return xasprintf("[%s]:%s", host, serv);
369	/return xasprintf("%s:%s", host, serv);/
370	/* - fall through instead */
371	}
372	#endif
373	/* For now we don't support anything else, so it has to be INET */
374	/if (sa->sa_family == AF_INET)/
375	return xasprintf("%s:%s", host, serv);
376	/return xstrdup(host);/
377	}
378
379	char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
380	{
381	return sockaddr2str(sa, 0);
382	}
383
384	char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
385	{
386	return sockaddr2str(sa, IGNORE_PORT);
387	}
388
389	char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
390	{
391	return sockaddr2str(sa, NI_NAMEREQD \| IGNORE_PORT);
392	}
393	char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
394	{
395	return sockaddr2str(sa, NI_NUMERICHOST);
396	}
397
398	char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
399	{
400	return sockaddr2str(sa, NI_NUMERICHOST \| IGNORE_PORT);
401	}