diff options
Diffstat (limited to 'release/src/router/busybox/libbb/xconnect.c')
| -rw-r--r-- | release/src/router/busybox/libbb/xconnect.c | 460 |
1 files changed, 402 insertions, 58 deletions
diff --git a/release/src/router/busybox/libbb/xconnect.c b/release/src/router/busybox/libbb/xconnect.c index 2945d760..f5d7983a 100644 --- a/release/src/router/busybox/libbb/xconnect.c +++ b/release/src/router/busybox/libbb/xconnect.c @@ -2,78 +2,422 @@ /* * Utility routines. * - * Connect to host at port using address resolusion from getaddrinfo + * Connect to host at port using address resolution from getaddrinfo * + * Licensed under GPLv2, see file LICENSE in this tarball for details. */ -#include <unistd.h> -#include <string.h> -#include <stdlib.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netdb.h> #include <netinet/in.h> +#include <net/if.h> #include "libbb.h" -int xconnect(const char *host, const char *port) -{ -#ifdef CONFIG_FEATURE_IPV6 - struct addrinfo hints; - struct addrinfo *res; - struct addrinfo *addr_info; - int error; - int s; - - memset(&hints, 0, sizeof(hints)); - /* set-up hints structure */ - hints.ai_family = PF_UNSPEC; - hints.ai_socktype = SOCK_STREAM; - error = getaddrinfo(host, port, &hints, &res); - if (error||!res) - bb_perror_msg_and_die(gai_strerror(error)); - addr_info=res; - while (res) { - s=socket(res->ai_family, res->ai_socktype, res->ai_protocol); - if (s<0) - { - error=s; - res=res->ai_next; - continue; - } - /* try to connect() to res->ai_addr */ - error = connect(s, res->ai_addr, res->ai_addrlen); - if (error >= 0) - break; - close(s); - res=res->ai_next; +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; + socklen_t len = 0; + + /* Can be optimized to do only one getsockname() */ + if (getsockname(fd, NULL, &len) != 0) + return NULL; + lsa = xzalloc(LSA_LEN_SIZE + len); + lsa->len = len; + getsockname(fd, &lsa->u.sa, &lsa->len); + return lsa; +} + +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"); } - freeaddrinfo(addr_info); - if (error < 0) - { - bb_perror_msg_and_die("Unable to connect to remote host (%s)", 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] != ':' && 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: ; + } + + memset(&hint, 0 , sizeof(hint)); +#if !ENABLE_FEATURE_IPV6 + hint.ai_family = AF_INET; /* do not try to find IPv6 */ #else - struct sockaddr_in s_addr; - int s = socket(AF_INET, SOCK_STREAM, 0); - struct servent *tserv; - int port_nr=htons(atoi(port)); - struct hostent * he; + 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 (port_nr==0 && (tserv = getservbyname(port, "tcp")) != NULL) - port_nr = tserv->s_port; +#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); +} - memset(&s_addr, 0, sizeof(struct sockaddr_in)); - s_addr.sin_family = AF_INET; - s_addr.sin_port = port_nr; +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 - he = xgethostbyname(host); - memcpy(&s_addr.sin_addr, he->h_addr, sizeof s_addr.sin_addr); +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); +} - if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0) - { - bb_perror_msg_and_die("Unable to connect to remote host (%s)", host); +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); } - return s; #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); } |