/*
* Utility routines.
*
- * Connect to host at port using address resolusion from getaddrinfo
+ * Connect to host at port using address resolution from getaddrinfo
*
*/
-#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 "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)
- 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;
+int setsockopt_reuseaddr(int fd)
+{
+ return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
+}
+int setsockopt_broadcast(int fd)
+{
+ return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
+}
+
+void 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)
- {
- 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 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 s;
-#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;
+ return (uint16_t)port_nr;
+}
- if (port_nr==0 && (tserv = getservbyname(port, "tcp")) != NULL)
- port_nr = tserv->s_port;
- memset(&s_addr, 0, sizeof(struct sockaddr_in));
- s_addr.sin_family = AF_INET;
- s_addr.sin_port = port_nr;
+/* "Old" networking API - only IPv4 */
+/*
+void 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_addr.sin_addr, he->h_addr, sizeof s_addr.sin_addr);
+ memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
+}
+
- if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0)
+int 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 get_nport(len_and_sockaddr *lsa)
+{
+#if ENABLE_FEATURE_IPV6
+ if (lsa->sa.sa_family == AF_INET6) {
+ return lsa->sin6.sin6_port;
+ }
+#endif
+ if (lsa->sa.sa_family == AF_INET) {
+ return lsa->sin.sin_port;
+ }
+ /* What? UNIX socket? IPX?? :) */
+ return -1;
+}
+
+void set_nport(len_and_sockaddr *lsa, unsigned port)
+{
+#if ENABLE_FEATURE_IPV6
+ if (lsa->sa.sa_family == AF_INET6) {
+ lsa->sin6.sin6_port = port;
+ return;
+ }
+#endif
+ if (lsa->sa.sa_family == AF_INET) {
+ lsa->sin.sin_port = port;
+ return;
+ }
+ /* What? UNIX socket? IPX?? :) */
+}
+
+/* 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, int ai_flags)
+{
+ int rc;
+ len_and_sockaddr *r; // = NULL;
+ struct addrinfo *result = NULL;
+ 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] == '[') {
+ host++;
+ cp = strchr(host, ']');
+ if (!cp || cp[1] != ':') /* Malformed: must have [xx]:nn */
+ bb_error_msg_and_die("bad address '%s'", org_host);
+ //return r; /* 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) {
+ int sz = cp - host + 1;
+ host = safe_strncpy(alloca(sz), host, sz);
+ if (ENABLE_FEATURE_IPV6 && *cp != ':')
+ cp++; /* skip ']' */
+ cp++; /* skip ':' */
+ port = xatou16(cp);
+ }
+
+ memset(&hint, 0 , sizeof(hint));
+ /* hint.ai_family = AF_UNSPEC; - zero anyway */
+#if !ENABLE_FEATURE_IPV6
+ hint.ai_family = AF_INET; /* do not try to find IPv6 */
+#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;
+ rc = getaddrinfo(host, NULL, &hint, &result);
+ if (rc || !result)
+ bb_error_msg_and_die("bad address '%s'", org_host);
+ r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
+ r->len = result->ai_addrlen;
+ memcpy(&r->sa, result->ai_addr, result->ai_addrlen);
+ set_nport(r, htons(port));
+ freeaddrinfo(result);
+ return r;
+}
+
+len_and_sockaddr* host2sockaddr(const char *host, int port)
+{
+ return str2sockaddr(host, port, 0);
+}
+
+static len_and_sockaddr* dotted2sockaddr(const char *host, int port)
+{
+ return str2sockaddr(host, port, NI_NUMERICHOST);
+}
+
+int xsocket_stream(len_and_sockaddr **lsap)
+{
+ len_and_sockaddr *lsa;
+ int fd;
+ int len = sizeof(struct sockaddr_in);
+ int family = AF_INET;
+
+#if ENABLE_FEATURE_IPV6
+ fd = socket(AF_INET6, SOCK_STREAM, 0);
+ if (fd >= 0) {
+ len = sizeof(struct sockaddr_in6);
+ family = AF_INET6;
+ } else
+#endif
{
- perror_msg_and_die("Unable to connect to remote host (%s)", host);
+ fd = xsocket(AF_INET, SOCK_STREAM, 0);
+ }
+ lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
+ lsa->len = len;
+ lsa->sa.sa_family = family;
+ *lsap = lsa;
+ return fd;
+}
+
+int create_and_bind_stream_or_die(const char *bindaddr, int port)
+{
+ int fd;
+ len_and_sockaddr *lsa;
+
+ if (bindaddr && bindaddr[0]) {
+ lsa = dotted2sockaddr(bindaddr, port);
+ /* currently NULL check is in str2sockaddr */
+ //if (!lsa)
+ // bb_error_msg_and_die("bad address '%s'", bindaddr);
+ /* user specified bind addr dictates family */
+ fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
+ } else {
+ fd = xsocket_stream(&lsa);
+ set_nport(lsa, htons(port));
+ }
+ setsockopt_reuseaddr(fd);
+ xbind(fd, &lsa->sa, lsa->len);
+ free(lsa);
+ return fd;
+}
+
+int create_and_connect_stream_or_die(const char *peer, int port)
+{
+ int fd;
+ len_and_sockaddr *lsa;
+
+ lsa = host2sockaddr(peer, port);
+ /* currently NULL check is in str2sockaddr */
+ //if (!lsa)
+ // bb_error_msg_and_die("bad address '%s'", peer);
+ fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
+ setsockopt_reuseaddr(fd);
+ xconnect(fd, &lsa->sa, lsa->len);
+ free(lsa);
+ return fd;
+}
+
+int xconnect_stream(const len_and_sockaddr *lsa)
+{
+ int fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
+ xconnect(fd, &lsa->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* sockaddr2str(const struct sockaddr *sa, socklen_t salen, int flags)
+{
+ char host[128];
+ char serv[16];
+ int 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 */
}
- return s;
#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* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen)
+{
+ return sockaddr2str(sa, salen, 0);
+}
+
+char* xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa, socklen_t salen)
+{
+ return sockaddr2str(sa, salen, NI_NAMEREQD | IGNORE_PORT);
+}
+char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen)
+{
+ return sockaddr2str(sa, salen, NI_NUMERICHOST);
+}
+
+char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa, socklen_t salen)
+{
+ return sockaddr2str(sa, salen, NI_NUMERICHOST | IGNORE_PORT);
}
projects / oweals / busybox.git / blobdiff