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	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Utility routines.
4			*
5			* Connect to host at port using address resolution from getaddrinfo
6			*
7	niro	984	* Licensed under GPLv2, see file LICENSE in this tarball for details.
8	niro	532	*/
9
10	niro	984	#include <sys/socket.h> /* netinet/in.h needs it */
11	niro	532	#include <netinet/in.h>
12	niro	816	#include <net/if.h>
13	niro	984	#include <sys/un.h>
14	niro	532	#include "libbb.h"
15
16	niro	816	void FAST_FUNC setsockopt_reuseaddr(int fd)
17	niro	532	{
18	niro	816	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
19	niro	532	}
20	niro	816	int FAST_FUNC setsockopt_broadcast(int fd)
21	niro	532	{
22	niro	816	return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
23	niro	532	}
24	niro	816	int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
25			{
26			int r;
27			struct ifreq ifr;
28	niro	984	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	niro	816	* 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	niro	532
40	niro	984	len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
41			{
42			len_and_sockaddr lsa;
43			len_and_sockaddr *lsa_ptr;
44	niro	816
45	niro	984	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	niro	816	void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
60	niro	532	{
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	niro	984	"can't connect to remote host",
67	niro	532	inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
68	niro	984	bb_perror_msg_and_die("can't connect to remote host");
69	niro	532	}
70			}
71
72			/* Return port number for a service.
73			* If "port" is a number use it as the port.
74	niro	984	* If "port" is a name it is looked up in /etc/services,
75			* if it isnt found return default_port
76			*/
77	niro	816	unsigned FAST_FUNC bb_lookup_port(const char port, const char protocol, unsigned default_port)
78	niro	532	{
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	niro	816	/*
102			void FAST_FUNC bb_lookup_host(struct sockaddr_in s_in, const char host)
103	niro	532	{
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	niro	816
113			int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
114	niro	532	{
115			int s = xsocket(AF_INET, SOCK_STREAM, 0);
116			xconnect(s, (struct sockaddr) s_addr, sizeof(s_addr));
117			return s;
118			}
119	niro	816	*/
120	niro	532
121			/* "New" networking API */
122
123
124	niro	816	int FAST_FUNC get_nport(const struct sockaddr *sa)
125	niro	532	{
126			#if ENABLE_FEATURE_IPV6
127	niro	816	if (sa->sa_family == AF_INET6) {
128			return ((struct sockaddr_in6*)sa)->sin6_port;
129	niro	532	}
130			#endif
131	niro	816	if (sa->sa_family == AF_INET) {
132			return ((struct sockaddr_in*)sa)->sin_port;
133	niro	532	}
134	niro	816	/* What? UNIX socket? IPX?? :) */
135	niro	532	return -1;
136			}
137
138	niro	816	void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
139	niro	532	{
140			#if ENABLE_FEATURE_IPV6
141	niro	816	if (lsa->u.sa.sa_family == AF_INET6) {
142			lsa->u.sin6.sin6_port = port;
143	niro	532	return;
144			}
145			#endif
146	niro	816	if (lsa->u.sa.sa_family == AF_INET) {
147			lsa->u.sin.sin_port = port;
148	niro	532	return;
149			}
150			/* What? UNIX socket? IPX?? :) */
151			}
152
153	niro	816	/* 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	niro	984	IF_FEATURE_IPV6(sa_family_t af,)
162	niro	816	int ai_flags)
163	niro	532	{
164	niro	984	IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
165	niro	532	int rc;
166	niro	984	len_and_sockaddr *r;
167	niro	532	struct addrinfo *result = NULL;
168	niro	816	struct addrinfo *used_res;
169	niro	532	const char org_host = host; / only for error msg */
170			const char *cp;
171			struct addrinfo hint;
172
173	niro	984	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	niro	532	/* Ugly parsing of host:addr */
187			if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
188	niro	816	/* Even uglier parsing of [xx]:nn */
189	niro	532	host++;
190			cp = strchr(host, ']');
191	niro	984	if (!cp \|\| (cp[1] != ':' && cp[1] != '\0')) {
192			/* Malformed: must be [xx]:nn or [xx] */
193	niro	816	bb_error_msg("bad address '%s'", org_host);
194			if (ai_flags & DIE_ON_ERROR)
195			xfunc_die();
196			return NULL;
197			}
198	niro	532	} 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	niro	816	if (cp) { /* points to ":" or "]:" */
206	niro	532	int sz = cp - host + 1;
207	niro	984
208	niro	532	host = safe_strncpy(alloca(sz), host, sz);
209	niro	984	if (ENABLE_FEATURE_IPV6 && *cp != ':') {
210	niro	532	cp++; /* skip ']' */
211	niro	984	if (cp == '\0') / [xx] without port */
212			goto skip;
213			}
214	niro	532	cp++; /* skip ':' */
215	niro	816	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	niro	984	skip: ;
223	niro	532	}
224
225	niro	984	/* 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	niro	532	memset(&hint, 0 , sizeof(hint));
258	niro	816	hint.ai_family = af;
259	niro	532	/* 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	niro	816	hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
263	niro	532	rc = getaddrinfo(host, NULL, &hint, &result);
264	niro	816	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	niro	984	r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
283	niro	816	r->len = used_res->ai_addrlen;
284			memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
285	niro	984
286			set_port:
287	niro	532	set_nport(r, htons(port));
288	niro	816	ret:
289	niro	532	freeaddrinfo(result);
290			return r;
291			}
292	niro	816	#if !ENABLE_FEATURE_IPV6
293			#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
294			#endif
295	niro	532
296	niro	816	#if ENABLE_FEATURE_IPV6
297			len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
298	niro	532	{
299	niro	816	return str2sockaddr(host, port, af, 0);
300	niro	532	}
301
302	niro	816	len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
303	niro	532	{
304	niro	816	return str2sockaddr(host, port, af, DIE_ON_ERROR);
305	niro	532	}
306	niro	816	#endif
307	niro	532
308	niro	816	len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
309	niro	532	{
310	niro	816	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	niro	984	int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
325	niro	816	{
326	niro	984	IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
327	niro	532	len_and_sockaddr *lsa;
328			int fd;
329	niro	816	int len;
330	niro	532
331			#if ENABLE_FEATURE_IPV6
332	niro	816	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	niro	532	len = sizeof(struct sockaddr_in6);
347	niro	816	}
348	niro	532	#endif
349	niro	984	lsa = xzalloc(LSA_LEN_SIZE + len);
350	niro	532	lsa->len = len;
351	niro	816	lsa->u.sa.sa_family = family;
352	niro	532	*lsap = lsa;
353			return fd;
354			}
355
356	niro	816	int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
357	niro	532	{
358	niro	984	return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
359	niro	816	}
360
361			static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
362			{
363	niro	532	int fd;
364			len_and_sockaddr *lsa;
365
366			if (bindaddr && bindaddr[0]) {
367	niro	816	lsa = xdotted2sockaddr(bindaddr, port);
368	niro	532	/* user specified bind addr dictates family */
369	niro	816	fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
370	niro	532	} else {
371	niro	984	fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
372	niro	532	set_nport(lsa, htons(port));
373			}
374			setsockopt_reuseaddr(fd);
375	niro	816	xbind(fd, &lsa->u.sa, lsa->len);
376	niro	532	free(lsa);
377			return fd;
378			}
379
380	niro	816	int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
381	niro	532	{
382	niro	816	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	niro	532	int fd;
394			len_and_sockaddr *lsa;
395
396	niro	816	lsa = xhost2sockaddr(peer, port);
397			fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
398	niro	532	setsockopt_reuseaddr(fd);
399	niro	816	xconnect(fd, &lsa->u.sa, lsa->len);
400	niro	532	free(lsa);
401			return fd;
402			}
403
404	niro	816	int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
405	niro	532	{
406	niro	816	int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
407			xconnect(fd, &lsa->u.sa, lsa->len);
408	niro	532	return fd;
409			}
410
411	niro	816	/* 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	niro	532	{
416			char host[128];
417			char serv[16];
418	niro	816	int rc;
419			socklen_t salen;
420
421	niro	984	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	niro	816	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	niro	532	host, sizeof(host),
437	niro	816	/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
438	niro	532	serv, sizeof(serv),
439	niro	816	/* do not resolve port# into service _name_ */
440			flags \| NI_NUMERICSERV
441	niro	532	);
442	niro	816	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	niro	532	}
459
460	niro	816	char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
461	niro	532	{
462	niro	816	return sockaddr2str(sa, 0);
463	niro	532	}
464
465	niro	816	char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
466	niro	532	{
467	niro	816	return sockaddr2str(sa, IGNORE_PORT);
468	niro	532	}
469	niro	816
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			}