busybox/libbb/xconnect.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Connect to host at port using address resolution from getaddrinfo
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */

#include <sys/socket.h> /* netinet/in.h needs it */
#include <netinet/in.h>
#include <net/if.h>
#include <sys/un.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_IFNAMSIZ(ifr.ifr_name, iface);
	/* NB: passing (iface, strlen(iface) + 1) does not work!
	 * (maybe it works on _some_ kernels, but not on 2.6.26)
	 * 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;
}

len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
{
	len_and_sockaddr lsa;
	len_and_sockaddr *lsa_ptr;

	lsa.len = LSA_SIZEOF_SA;
	if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
		return NULL;

	lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
	if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
		lsa_ptr->len = lsa.len;
		getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
	} else {
		memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
	}
	return lsa_ptr;
}

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)",
				"can't connect to remote host",
				inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
		bb_perror_msg_and_die("can't 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,
IF_FEATURE_IPV6(sa_family_t af,)
		int ai_flags)
{
IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
	int rc;
	len_and_sockaddr *r;
	struct addrinfo *result = NULL;
	struct addrinfo *used_res;
	const char *org_host = host; /* only for error msg */
	const char *cp;
	struct addrinfo hint;

	if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
		struct sockaddr_un *sun;

		r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
		r->len = sizeof(struct sockaddr_un);
		r->u.sa.sa_family = AF_UNIX;
		sun = (struct sockaddr_un *)&r->u.sa;
		safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
		return r;
	}

	r = NULL;

	/* 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] != ':' && cp[1] != '\0')) {
			/* Malformed: must be [xx]:nn or [xx] */
			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 ']' */
			if (*cp == '\0') /* [xx] without port */
				goto 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;
		}
 skip: ;
	}

	/* Next two if blocks allow to skip getaddrinfo()
	 * in case host name is a numeric IP(v6) address.
	 * getaddrinfo() initializes DNS resolution machinery,
	 * scans network config and such - tens of syscalls.
	 */
	/* If we were not asked specifically for IPv6,
	 * check whether this is a numeric IPv4 */
	IF_FEATURE_IPV6(if(af != AF_INET6)) {
		struct in_addr in4;
		if (inet_aton(host, &in4) != 0) {
			r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
			r->len = sizeof(struct sockaddr_in);
			r->u.sa.sa_family = AF_INET;
			r->u.sin.sin_addr = in4;
			goto set_port;
		}
	}
#if ENABLE_FEATURE_IPV6
	/* If we were not asked specifically for IPv4,
	 * check whether this is a numeric IPv6 */
	if (af != AF_INET) {
		struct in6_addr in6;
		if (inet_pton(AF_INET6, host, &in6) > 0) {
			r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
			r->len = sizeof(struct sockaddr_in6);
			r->u.sa.sa_family = AF_INET6;
			r->u.sin6.sin6_addr = in6;
			goto set_port;
		}
	}
#endif

	memset(&hint, 0 , sizeof(hint));
	hint.ai_family = af;
	/* 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(LSA_LEN_SIZE + used_res->ai_addrlen);
	r->len = used_res->ai_addrlen;
	memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);

 set_port:
	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, IF_FEATURE_IPV6(int family,) int sock_type)
{
	IF_NOT_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(LSA_LEN_SIZE + 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, IF_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, IF_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;

	if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
		struct sockaddr_un *sun = (struct sockaddr_un *)sa;
		return xasprintf("local:%.*s",
				(int) sizeof(sun->sun_path),
				sun->sun_path);
	}

	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	* Licensed under GPLv2, see file LICENSE in this tarball for details.
8	*/
9
10	#include <sys/socket.h> /* netinet/in.h needs it */
11	#include <netinet/in.h>
12	#include <net/if.h>
13	#include <sys/un.h>
14	#include "libbb.h"
15
16	void FAST_FUNC setsockopt_reuseaddr(int fd)
17	{
18	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
19	}
20	int FAST_FUNC setsockopt_broadcast(int fd)
21	{
22	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
23	}
24	int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
25	{
26	int r;
27	struct ifreq ifr;
28	strncpy_IFNAMSIZ(ifr.ifr_name, iface);
29	/* NB: passing (iface, strlen(iface) + 1) does not work!
30	* (maybe it works on _some_ kernels, but not on 2.6.26)
31	* Actually, ifr_name is at offset 0, and in practice
32	* just giving char[IFNAMSIZ] instead of struct ifreq works too.
33	* But just in case it's not true on some obscure arch... */
34	r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
35	if (r)
36	bb_perror_msg("can't bind to interface %s", iface);
37	return r;
38	}
39
40	len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
41	{
42	len_and_sockaddr lsa;
43	len_and_sockaddr *lsa_ptr;
44
45	lsa.len = LSA_SIZEOF_SA;
46	if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
47	return NULL;
48
49	lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
50	if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
51	lsa_ptr->len = lsa.len;
52	getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
53	} else {
54	memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
55	}
56	return lsa_ptr;
57	}
58
59	void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
60	{
61	if (connect(s, s_addr, addrlen) < 0) {
62	if (ENABLE_FEATURE_CLEAN_UP)
63	close(s);
64	if (s_addr->sa_family == AF_INET)
65	bb_perror_msg_and_die("%s (%s)",
66	"can't connect to remote host",
67	inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
68	bb_perror_msg_and_die("can't connect to remote host");
69	}
70	}
71
72	/* Return port number for a service.
73	* If "port" is a number use it as the port.
74	* If "port" is a name it is looked up in /etc/services,
75	* if it isnt found return default_port
76	*/
77	unsigned FAST_FUNC bb_lookup_port(const char port, const char protocol, unsigned default_port)
78	{
79	unsigned port_nr = default_port;
80	if (port) {
81	int old_errno;
82
83	/* Since this is a lib function, we're not allowed to reset errno to 0.
84	* Doing so could break an app that is deferring checking of errno. */
85	old_errno = errno;
86	port_nr = bb_strtou(port, NULL, 10);
87	if (errno \|\| port_nr > 65535) {
88	struct servent *tserv = getservbyname(port, protocol);
89	port_nr = default_port;
90	if (tserv)
91	port_nr = ntohs(tserv->s_port);
92	}
93	errno = old_errno;
94	}
95	return (uint16_t)port_nr;
96	}
97
98
99	/* "Old" networking API - only IPv4 */
100
101	/*
102	void FAST_FUNC bb_lookup_host(struct sockaddr_in s_in, const char host)
103	{
104	struct hostent *he;
105
106	memset(s_in, 0, sizeof(struct sockaddr_in));
107	s_in->sin_family = AF_INET;
108	he = xgethostbyname(host);
109	memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
110	}
111
112
113	int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
114	{
115	int s = xsocket(AF_INET, SOCK_STREAM, 0);
116	xconnect(s, (struct sockaddr) s_addr, sizeof(s_addr));
117	return s;
118	}
119	*/
120
121	/* "New" networking API */
122
123
124	int FAST_FUNC get_nport(const struct sockaddr *sa)
125	{
126	#if ENABLE_FEATURE_IPV6
127	if (sa->sa_family == AF_INET6) {
128	return ((struct sockaddr_in6*)sa)->sin6_port;
129	}
130	#endif
131	if (sa->sa_family == AF_INET) {
132	return ((struct sockaddr_in*)sa)->sin_port;
133	}
134	/* What? UNIX socket? IPX?? :) */
135	return -1;
136	}
137
138	void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
139	{
140	#if ENABLE_FEATURE_IPV6
141	if (lsa->u.sa.sa_family == AF_INET6) {
142	lsa->u.sin6.sin6_port = port;
143	return;
144	}
145	#endif
146	if (lsa->u.sa.sa_family == AF_INET) {
147	lsa->u.sin.sin_port = port;
148	return;
149	}
150	/* What? UNIX socket? IPX?? :) */
151	}
152
153	/* We hijack this constant to mean something else */
154	/* It doesn't hurt because we will remove this bit anyway */
155	#define DIE_ON_ERROR AI_CANONNAME
156
157	/* host: "1.2.3.4[:port]", "www.google.com[:port]"
158	* port: if neither of above specifies port # */
159	static len_and_sockaddr* str2sockaddr(
160	const char *host, int port,
161	IF_FEATURE_IPV6(sa_family_t af,)
162	int ai_flags)
163	{
164	IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
165	int rc;
166	len_and_sockaddr *r;
167	struct addrinfo *result = NULL;
168	struct addrinfo *used_res;
169	const char org_host = host; / only for error msg */
170	const char *cp;
171	struct addrinfo hint;
172
173	if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
174	struct sockaddr_un *sun;
175
176	r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
177	r->len = sizeof(struct sockaddr_un);
178	r->u.sa.sa_family = AF_UNIX;
179	sun = (struct sockaddr_un *)&r->u.sa;
180	safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
181	return r;
182	}
183
184	r = NULL;
185
186	/* Ugly parsing of host:addr */
187	if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
188	/* Even uglier parsing of [xx]:nn */
189	host++;
190	cp = strchr(host, ']');
191	if (!cp \|\| (cp[1] != ':' && cp[1] != '\0')) {
192	/* Malformed: must be [xx]:nn or [xx] */
193	bb_error_msg("bad address '%s'", org_host);
194	if (ai_flags & DIE_ON_ERROR)
195	xfunc_die();
196	return NULL;
197	}
198	} else {
199	cp = strrchr(host, ':');
200	if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
201	/* There is more than one ':' (e.g. "::1") */
202	cp = NULL; /* it's not a port spec */
203	}
204	}
205	if (cp) { /* points to ":" or "]:" */
206	int sz = cp - host + 1;
207
208	host = safe_strncpy(alloca(sz), host, sz);
209	if (ENABLE_FEATURE_IPV6 && *cp != ':') {
210	cp++; /* skip ']' */
211	if (cp == '\0') / [xx] without port */
212	goto skip;
213	}
214	cp++; /* skip ':' */
215	port = bb_strtou(cp, NULL, 10);
216	if (errno \|\| (unsigned)port > 0xffff) {
217	bb_error_msg("bad port spec '%s'", org_host);
218	if (ai_flags & DIE_ON_ERROR)
219	xfunc_die();
220	return NULL;
221	}
222	skip: ;
223	}
224
225	/* Next two if blocks allow to skip getaddrinfo()
226	* in case host name is a numeric IP(v6) address.
227	* getaddrinfo() initializes DNS resolution machinery,
228	* scans network config and such - tens of syscalls.
229	*/
230	/* If we were not asked specifically for IPv6,
231	* check whether this is a numeric IPv4 */
232	IF_FEATURE_IPV6(if(af != AF_INET6)) {
233	struct in_addr in4;
234	if (inet_aton(host, &in4) != 0) {
235	r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
236	r->len = sizeof(struct sockaddr_in);
237	r->u.sa.sa_family = AF_INET;
238	r->u.sin.sin_addr = in4;
239	goto set_port;
240	}
241	}
242	#if ENABLE_FEATURE_IPV6
243	/* If we were not asked specifically for IPv4,
244	* check whether this is a numeric IPv6 */
245	if (af != AF_INET) {
246	struct in6_addr in6;
247	if (inet_pton(AF_INET6, host, &in6) > 0) {
248	r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
249	r->len = sizeof(struct sockaddr_in6);
250	r->u.sa.sa_family = AF_INET6;
251	r->u.sin6.sin6_addr = in6;
252	goto set_port;
253	}
254	}
255	#endif
256
257	memset(&hint, 0 , sizeof(hint));
258	hint.ai_family = af;
259	/* Needed. Or else we will get each address thrice (or more)
260	* for each possible socket type (tcp,udp,raw...): */
261	hint.ai_socktype = SOCK_STREAM;
262	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
263	rc = getaddrinfo(host, NULL, &hint, &result);
264	if (rc \|\| !result) {
265	bb_error_msg("bad address '%s'", org_host);
266	if (ai_flags & DIE_ON_ERROR)
267	xfunc_die();
268	goto ret;
269	}
270	used_res = result;
271	#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
272	while (1) {
273	if (used_res->ai_family == AF_INET)
274	break;
275	used_res = used_res->ai_next;
276	if (!used_res) {
277	used_res = result;
278	break;
279	}
280	}
281	#endif
282	r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
283	r->len = used_res->ai_addrlen;
284	memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
285
286	set_port:
287	set_nport(r, htons(port));
288	ret:
289	freeaddrinfo(result);
290	return r;
291	}
292	#if !ENABLE_FEATURE_IPV6
293	#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
294	#endif
295
296	#if ENABLE_FEATURE_IPV6
297	len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
298	{
299	return str2sockaddr(host, port, af, 0);
300	}
301
302	len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
303	{
304	return str2sockaddr(host, port, af, DIE_ON_ERROR);
305	}
306	#endif
307
308	len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
309	{
310	return str2sockaddr(host, port, AF_UNSPEC, 0);
311	}
312
313	len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
314	{
315	return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
316	}
317
318	len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
319	{
320	return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST \| DIE_ON_ERROR);
321	}
322
323	#undef xsocket_type
324	int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
325	{
326	IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
327	len_and_sockaddr *lsa;
328	int fd;
329	int len;
330
331	#if ENABLE_FEATURE_IPV6
332	if (family == AF_UNSPEC) {
333	fd = socket(AF_INET6, sock_type, 0);
334	if (fd >= 0) {
335	family = AF_INET6;
336	goto done;
337	}
338	family = AF_INET;
339	}
340	#endif
341	fd = xsocket(family, sock_type, 0);
342	len = sizeof(struct sockaddr_in);
343	#if ENABLE_FEATURE_IPV6
344	if (family == AF_INET6) {
345	done:
346	len = sizeof(struct sockaddr_in6);
347	}
348	#endif
349	lsa = xzalloc(LSA_LEN_SIZE + len);
350	lsa->len = len;
351	lsa->u.sa.sa_family = family;
352	*lsap = lsa;
353	return fd;
354	}
355
356	int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
357	{
358	return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
359	}
360
361	static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
362	{
363	int fd;
364	len_and_sockaddr *lsa;
365
366	if (bindaddr && bindaddr[0]) {
367	lsa = xdotted2sockaddr(bindaddr, port);
368	/* user specified bind addr dictates family */
369	fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
370	} else {
371	fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
372	set_nport(lsa, htons(port));
373	}
374	setsockopt_reuseaddr(fd);
375	xbind(fd, &lsa->u.sa, lsa->len);
376	free(lsa);
377	return fd;
378	}
379
380	int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
381	{
382	return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
383	}
384
385	int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
386	{
387	return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
388	}
389
390
391	int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
392	{
393	int fd;
394	len_and_sockaddr *lsa;
395
396	lsa = xhost2sockaddr(peer, port);
397	fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
398	setsockopt_reuseaddr(fd);
399	xconnect(fd, &lsa->u.sa, lsa->len);
400	free(lsa);
401	return fd;
402	}
403
404	int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
405	{
406	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
407	xconnect(fd, &lsa->u.sa, lsa->len);
408	return fd;
409	}
410
411	/* We hijack this constant to mean something else */
412	/* It doesn't hurt because we will add this bit anyway */
413	#define IGNORE_PORT NI_NUMERICSERV
414	static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
415	{
416	char host[128];
417	char serv[16];
418	int rc;
419	socklen_t salen;
420
421	if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
422	struct sockaddr_un sun = (struct sockaddr_un )sa;
423	return xasprintf("local:%.*s",
424	(int) sizeof(sun->sun_path),
425	sun->sun_path);
426	}
427
428	salen = LSA_SIZEOF_SA;
429	#if ENABLE_FEATURE_IPV6
430	if (sa->sa_family == AF_INET)
431	salen = sizeof(struct sockaddr_in);
432	if (sa->sa_family == AF_INET6)
433	salen = sizeof(struct sockaddr_in6);
434	#endif
435	rc = getnameinfo(sa, salen,
436	host, sizeof(host),
437	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
438	serv, sizeof(serv),
439	/* do not resolve port# into service _name_ */
440	flags \| NI_NUMERICSERV
441	);
442	if (rc)
443	return NULL;
444	if (flags & IGNORE_PORT)
445	return xstrdup(host);
446	#if ENABLE_FEATURE_IPV6
447	if (sa->sa_family == AF_INET6) {
448	if (strchr(host, ':')) /* heh, it's not a resolved hostname */
449	return xasprintf("[%s]:%s", host, serv);
450	/return xasprintf("%s:%s", host, serv);/
451	/* - fall through instead */
452	}
453	#endif
454	/* For now we don't support anything else, so it has to be INET */
455	/if (sa->sa_family == AF_INET)/
456	return xasprintf("%s:%s", host, serv);
457	/return xstrdup(host);/
458	}
459
460	char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
461	{
462	return sockaddr2str(sa, 0);
463	}
464
465	char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
466	{
467	return sockaddr2str(sa, IGNORE_PORT);
468	}
469
470	char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
471	{
472	return sockaddr2str(sa, NI_NAMEREQD \| IGNORE_PORT);
473	}
474	char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
475	{
476	return sockaddr2str(sa, NI_NUMERICHOST);
477	}
478
479	char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
480	{
481	return sockaddr2str(sa, NI_NUMERICHOST \| IGNORE_PORT);
482	}