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function old new delta docolon 207 204 -3 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
452 lines
12 KiB
C
452 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Connect to host at port using address resolution from getaddrinfo
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include <sys/socket.h> /* netinet/in.h needs it */
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#include <netinet/in.h>
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#include <net/if.h>
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#include <sys/un.h>
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#include "libbb.h"
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void FAST_FUNC setsockopt_reuseaddr(int fd)
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{
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
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}
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int FAST_FUNC setsockopt_broadcast(int fd)
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{
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return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
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}
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int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
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{
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int r;
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struct ifreq ifr;
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strncpy_IFNAMSIZ(ifr.ifr_name, iface);
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/* NB: passing (iface, strlen(iface) + 1) does not work!
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* (maybe it works on _some_ kernels, but not on 2.6.26)
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* Actually, ifr_name is at offset 0, and in practice
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* just giving char[IFNAMSIZ] instead of struct ifreq works too.
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* But just in case it's not true on some obscure arch... */
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r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
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if (r)
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bb_perror_msg("can't bind to interface %s", iface);
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return r;
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}
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len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
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{
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len_and_sockaddr lsa;
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len_and_sockaddr *lsa_ptr;
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lsa.len = LSA_SIZEOF_SA;
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if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
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return NULL;
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lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
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if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
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lsa_ptr->len = lsa.len;
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getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
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} else {
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memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
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}
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return lsa_ptr;
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}
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void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
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{
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if (connect(s, s_addr, addrlen) < 0) {
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if (ENABLE_FEATURE_CLEAN_UP)
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close(s);
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if (s_addr->sa_family == AF_INET)
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bb_perror_msg_and_die("%s (%s)",
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"cannot connect to remote host",
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inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
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bb_perror_msg_and_die("cannot connect to remote host");
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}
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}
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/* Return port number for a service.
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* If "port" is a number use it as the port.
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* If "port" is a name it is looked up in /etc/services,
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* if it isnt found return default_port
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*/
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unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
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{
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unsigned port_nr = default_port;
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if (port) {
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int old_errno;
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/* Since this is a lib function, we're not allowed to reset errno to 0.
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* Doing so could break an app that is deferring checking of errno. */
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old_errno = errno;
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port_nr = bb_strtou(port, NULL, 10);
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if (errno || port_nr > 65535) {
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struct servent *tserv = getservbyname(port, protocol);
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port_nr = default_port;
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if (tserv)
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port_nr = ntohs(tserv->s_port);
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}
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errno = old_errno;
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}
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return (uint16_t)port_nr;
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}
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/* "Old" networking API - only IPv4 */
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/*
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void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
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{
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struct hostent *he;
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memset(s_in, 0, sizeof(struct sockaddr_in));
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s_in->sin_family = AF_INET;
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he = xgethostbyname(host);
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memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
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}
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int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
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{
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int s = xsocket(AF_INET, SOCK_STREAM, 0);
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xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
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return s;
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}
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*/
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/* "New" networking API */
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int FAST_FUNC get_nport(const struct sockaddr *sa)
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{
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#if ENABLE_FEATURE_IPV6
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if (sa->sa_family == AF_INET6) {
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return ((struct sockaddr_in6*)sa)->sin6_port;
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}
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#endif
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if (sa->sa_family == AF_INET) {
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return ((struct sockaddr_in*)sa)->sin_port;
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}
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/* What? UNIX socket? IPX?? :) */
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return -1;
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}
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void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
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{
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#if ENABLE_FEATURE_IPV6
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if (lsa->u.sa.sa_family == AF_INET6) {
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lsa->u.sin6.sin6_port = port;
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return;
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}
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#endif
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if (lsa->u.sa.sa_family == AF_INET) {
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lsa->u.sin.sin_port = port;
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return;
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}
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/* What? UNIX socket? IPX?? :) */
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}
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/* We hijack this constant to mean something else */
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/* It doesn't hurt because we will remove this bit anyway */
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#define DIE_ON_ERROR AI_CANONNAME
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/* host: "1.2.3.4[:port]", "www.google.com[:port]"
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* port: if neither of above specifies port # */
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static len_and_sockaddr* str2sockaddr(
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const char *host, int port,
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IF_FEATURE_IPV6(sa_family_t af,)
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int ai_flags)
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{
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int rc;
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len_and_sockaddr *r;
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struct addrinfo *result = NULL;
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struct addrinfo *used_res;
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const char *org_host = host; /* only for error msg */
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const char *cp;
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struct addrinfo hint;
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if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
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struct sockaddr_un *sun;
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r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
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r->len = sizeof(struct sockaddr_un);
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r->u.sa.sa_family = AF_UNIX;
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sun = (struct sockaddr_un *)&r->u.sa;
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safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
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return r;
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}
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r = NULL;
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/* Ugly parsing of host:addr */
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if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
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/* Even uglier parsing of [xx]:nn */
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host++;
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cp = strchr(host, ']');
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if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
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/* Malformed: must be [xx]:nn or [xx] */
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bb_error_msg("bad address '%s'", org_host);
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if (ai_flags & DIE_ON_ERROR)
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xfunc_die();
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return NULL;
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}
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} else {
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cp = strrchr(host, ':');
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if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
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/* There is more than one ':' (e.g. "::1") */
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cp = NULL; /* it's not a port spec */
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}
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}
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if (cp) { /* points to ":" or "]:" */
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int sz = cp - host + 1;
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host = safe_strncpy(alloca(sz), host, sz);
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if (ENABLE_FEATURE_IPV6 && *cp != ':') {
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cp++; /* skip ']' */
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if (*cp == '\0') /* [xx] without port */
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goto skip;
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}
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cp++; /* skip ':' */
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port = bb_strtou(cp, NULL, 10);
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if (errno || (unsigned)port > 0xffff) {
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bb_error_msg("bad port spec '%s'", org_host);
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if (ai_flags & DIE_ON_ERROR)
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xfunc_die();
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return NULL;
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}
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skip: ;
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}
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memset(&hint, 0 , sizeof(hint));
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#if !ENABLE_FEATURE_IPV6
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hint.ai_family = AF_INET; /* do not try to find IPv6 */
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#else
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hint.ai_family = af;
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#endif
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/* Needed. Or else we will get each address thrice (or more)
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* for each possible socket type (tcp,udp,raw...): */
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hint.ai_socktype = SOCK_STREAM;
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hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
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rc = getaddrinfo(host, NULL, &hint, &result);
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if (rc || !result) {
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bb_error_msg("bad address '%s'", org_host);
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if (ai_flags & DIE_ON_ERROR)
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xfunc_die();
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goto ret;
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}
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used_res = result;
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#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
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while (1) {
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if (used_res->ai_family == AF_INET)
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break;
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used_res = used_res->ai_next;
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if (!used_res) {
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used_res = result;
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break;
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}
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}
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#endif
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r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
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r->len = used_res->ai_addrlen;
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memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
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set_nport(r, htons(port));
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ret:
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freeaddrinfo(result);
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return r;
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}
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#if !ENABLE_FEATURE_IPV6
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#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
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#endif
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#if ENABLE_FEATURE_IPV6
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len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
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{
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return str2sockaddr(host, port, af, 0);
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}
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len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
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{
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return str2sockaddr(host, port, af, DIE_ON_ERROR);
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}
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#endif
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len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
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{
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return str2sockaddr(host, port, AF_UNSPEC, 0);
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}
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len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
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{
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return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
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}
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len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
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{
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return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
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}
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#undef xsocket_type
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int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
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{
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IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
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len_and_sockaddr *lsa;
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int fd;
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int len;
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#if ENABLE_FEATURE_IPV6
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if (family == AF_UNSPEC) {
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fd = socket(AF_INET6, sock_type, 0);
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if (fd >= 0) {
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family = AF_INET6;
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goto done;
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}
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family = AF_INET;
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}
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#endif
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fd = xsocket(family, sock_type, 0);
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len = sizeof(struct sockaddr_in);
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#if ENABLE_FEATURE_IPV6
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if (family == AF_INET6) {
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done:
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len = sizeof(struct sockaddr_in6);
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}
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#endif
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lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
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lsa->len = len;
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lsa->u.sa.sa_family = family;
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*lsap = lsa;
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return fd;
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}
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int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
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{
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return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
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}
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static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
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{
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int fd;
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len_and_sockaddr *lsa;
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if (bindaddr && bindaddr[0]) {
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lsa = xdotted2sockaddr(bindaddr, port);
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/* user specified bind addr dictates family */
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fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
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} else {
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fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
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set_nport(lsa, htons(port));
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}
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setsockopt_reuseaddr(fd);
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xbind(fd, &lsa->u.sa, lsa->len);
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free(lsa);
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return fd;
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}
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int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
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{
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return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
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}
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int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
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{
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return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
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}
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int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
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{
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int fd;
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len_and_sockaddr *lsa;
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lsa = xhost2sockaddr(peer, port);
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fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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setsockopt_reuseaddr(fd);
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xconnect(fd, &lsa->u.sa, lsa->len);
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free(lsa);
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return fd;
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}
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int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
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{
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int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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xconnect(fd, &lsa->u.sa, lsa->len);
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return fd;
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}
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/* We hijack this constant to mean something else */
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/* It doesn't hurt because we will add this bit anyway */
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#define IGNORE_PORT NI_NUMERICSERV
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static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
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{
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char host[128];
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char serv[16];
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int rc;
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socklen_t salen;
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if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
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struct sockaddr_un *sun = (struct sockaddr_un *)sa;
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return xasprintf("local:%.*s",
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(int) sizeof(sun->sun_path),
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sun->sun_path);
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}
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salen = LSA_SIZEOF_SA;
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#if ENABLE_FEATURE_IPV6
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if (sa->sa_family == AF_INET)
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salen = sizeof(struct sockaddr_in);
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if (sa->sa_family == AF_INET6)
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salen = sizeof(struct sockaddr_in6);
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#endif
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rc = getnameinfo(sa, salen,
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host, sizeof(host),
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/* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
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serv, sizeof(serv),
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/* do not resolve port# into service _name_ */
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flags | NI_NUMERICSERV
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);
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if (rc)
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return NULL;
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if (flags & IGNORE_PORT)
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return xstrdup(host);
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#if ENABLE_FEATURE_IPV6
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if (sa->sa_family == AF_INET6) {
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if (strchr(host, ':')) /* heh, it's not a resolved hostname */
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return xasprintf("[%s]:%s", host, serv);
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/*return xasprintf("%s:%s", host, serv);*/
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/* - fall through instead */
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}
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#endif
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/* For now we don't support anything else, so it has to be INET */
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/*if (sa->sa_family == AF_INET)*/
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return xasprintf("%s:%s", host, serv);
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/*return xstrdup(host);*/
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}
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char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
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{
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return sockaddr2str(sa, 0);
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}
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char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
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{
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return sockaddr2str(sa, IGNORE_PORT);
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}
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char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
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{
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return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
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}
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char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
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{
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return sockaddr2str(sa, NI_NUMERICHOST);
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}
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char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
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{
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return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
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}
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