Improve generic ipv4+ipv6 support in libbb.

Convert telnet to it. Now this works:
telnetd -b [::1]:1234 - bind to IPv6 non-standard port
telnet [::1]:1234 - connect to IPv6 non-standard port
telnet ::1 1234 - same
This does not require ANY ipv6-specific code in applets
(no struct sockaddr_in6. In fact, no sockaddr_in, too).

diff --git a/include/libbb.h b/include/libbb.h
index 6f66c85..16f092f 100644 (file)
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -293,18 +293,17 @@ extern void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen);
 extern int xconnect_tcp_v4(struct sockaddr_in *s_addr);
 extern struct hostent *xgethostbyname(const char *name);
 extern struct hostent *xgethostbyname2(const char *name, int af);
-extern int xsocket_stream_ip4or6(sa_family_t *fp);
-typedef union {
-       struct sockaddr sa;
-       struct sockaddr_in sin;
-#if ENABLE_FEATURE_IPV6
-       struct sockaddr_in6 sin6;
-#endif
-} sockaddr_inet;
-extern int dotted2sockaddr(const char *dotted, struct sockaddr* sp, int socklen);
-extern int create_and_bind_socket_ip4or6(const char *hostaddr, int port);
+
 extern int setsockopt_reuseaddr(int fd);
 extern int setsockopt_broadcast(int fd);
+/* Create server TCP socket bound to bindaddr:port. bindaddr can be NULL,
+ * numeric IP ("N.N.N.N") or numeric IPv6 address,
+ * and can have ":PORT" suffix. If no suffix trere, second argument is used */
+extern int create_and_bind_stream_or_die(const char *bindaddr, int port);
+/* Create client TCP socket connected to peer:port. Peer cannot be NULL.
+ * Peer can be numeric IP ("N.N.N.N"), numeric IPv6 address or hostname,
+ * and can have ":PORT" suffix. If no suffix trere, second argument is used */
+extern int create_and_connect_stream_or_die(const char *peer, int def_port);
 
 
 extern char *xstrdup(const char *s);
@@ -506,7 +505,7 @@ USE_DESKTOP(long long) int uncompress(int fd_in, int fd_out);
 int inflate(int in, int out);
 
 
-unsigned short bb_lookup_port(const char *port, const char *protocol, unsigned short default_port);
+unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port);
 void bb_lookup_host(struct sockaddr_in *s_in, const char *host);
 
 int bb_make_directory(char *path, long mode, int flags);

diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index bc06915..93c3cd5 100644 (file)
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -6,39 +6,62 @@
  *
  */
 
+#include <netinet/in.h>
 #include "libbb.h"
 
+static const int one = 1;
+int setsockopt_reuseaddr(int fd)
+{
+       return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+}
+int setsockopt_broadcast(int fd)
+{
+       return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one));
+}
+
+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");
+       }
+}
+
 /* Return network byte ordered 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 short bb_lookup_port(const char *port, const char *protocol, unsigned short default_port)
+ * default_port */
+unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
 {
-       unsigned short port_nr = htons(default_port);
+       unsigned port_nr = htons(default_port);
        if (port) {
-               char *endptr;
                int old_errno;
-               long port_long;
 
                /* 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;
-               errno = 0;
-               port_long = strtol(port, &endptr, 10);
-               if (errno != 0 || *endptr!='\0' || endptr==port || port_long < 0 || port_long > 65535) {
+               port_nr = bb_strtou(port, NULL, 10);
+               if (errno || port_nr > 65535) {
                        struct servent *tserv = getservbyname(port, protocol);
-                       if (tserv) {
+                       if (tserv)
                                port_nr = tserv->s_port;
-                       }
                } else {
-                       port_nr = htons(port_long);
+                       port_nr = htons(port_nr);
                }
                errno = old_errno;
        }
        return port_nr;
 }
 
+
+/* "Old" networking API - only IPv4 */
+
+
 void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
 {
        struct hostent *he;
@@ -49,18 +72,6 @@ void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
        memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
 }
 
-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");
-       }
-}
-
 int xconnect_tcp_v4(struct sockaddr_in *s_addr)
 {
        int s = xsocket(AF_INET, SOCK_STREAM, 0);
@@ -68,87 +79,144 @@ int xconnect_tcp_v4(struct sockaddr_in *s_addr)
        return s;
 }
 
-static const int one = 1;
-int setsockopt_reuseaddr(int fd)
-{
-       return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
-}
-int setsockopt_broadcast(int fd)
-{
-       return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one));
-}
 
-int dotted2sockaddr(const char *dotted, struct sockaddr* sp, int socklen)
-{
-       union {
-               struct in_addr a4;
-#if ENABLE_FEATURE_IPV6
-               struct in6_addr a6;
-#endif
-       } a;
+/* "New" networking API */
 
-       /* TODO maybe: port spec? like n.n.n.n:nn */
 
+/* So far we do not expose struct and helpers to libbb */
+typedef struct len_and_sockaddr {
+       int len;
+       union {
+               struct sockaddr sa;
+               struct sockaddr_in sin;
 #if ENABLE_FEATURE_IPV6
-       if (socklen >= sizeof(struct sockaddr_in6)
-        && inet_pton(AF_INET6, dotted, &a.a6) > 0
-       ) {
-               ((struct sockaddr_in6*)sp)->sin6_family = AF_INET6;
-               ((struct sockaddr_in6*)sp)->sin6_addr = a.a6;
-               /* ((struct sockaddr_in6*)sp)->sin6_port = */
-               return 0; /* success */
-       }
+               struct sockaddr_in6 sin6;
 #endif
-       if (socklen >= sizeof(struct sockaddr_in)
-        && inet_pton(AF_INET, dotted, &a.a4) > 0
-       ) {
-               ((struct sockaddr_in*)sp)->sin_family = AF_INET;
-               ((struct sockaddr_in*)sp)->sin_addr = a.a4;
-               /* ((struct sockaddr_in*)sp)->sin_port = */
-               return 0; /* success */
+       };
+} len_and_sockaddr;
+//extern int xsocket_stream_ip4or6(sa_family_t *fp);
+//extern len_and_sockaddr* host2sockaddr(const char *host, int def_port);
+//extern len_and_sockaddr* dotted2sockaddr(const char *dotted, int def_port);
+
+/* peer: "1.2.3.4[:port]", "www.google.com[:port]"
+ * def_port: if neither of above specifies port #
+ */
+static len_and_sockaddr* str2sockaddr(const char *host, int def_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;
+       char service[sizeof(int)*3 + 1];
+       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 */
+               }
        }
-       return 1;
+       if (cp) {
+               host = safe_strncpy(alloca(cp - host + 1), host, cp - host);
+               if (ENABLE_FEATURE_IPV6 && *cp != ':')
+                       cp++; /* skip ']' */
+               cp++; /* skip ':' */
+       } else {
+               utoa_to_buf(def_port, service, sizeof(service));
+               cp = service;
+       }
+
+       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 | AI_NUMERICSERV;
+       rc = getaddrinfo(host, cp, &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);
+       freeaddrinfo(result);
+       return r;
+}
+
+static len_and_sockaddr* host2sockaddr(const char *host, int def_port)
+{
+       return str2sockaddr(host, def_port, 0);
+}
+
+static len_and_sockaddr* dotted2sockaddr(const char *host, int def_port)
+{
+       return str2sockaddr(host, def_port, NI_NUMERICHOST);
 }
 
-int xsocket_stream_ip4or6(sa_family_t *fp)
+static int xsocket_stream_ip4or6(len_and_sockaddr *lsa)
 {
        int fd;
 #if ENABLE_FEATURE_IPV6
        fd = socket(AF_INET6, SOCK_STREAM, 0);
-       if (fp) *fp = AF_INET6;
-       if (fd < 0)
+       lsa->sa.sa_family = AF_INET6;
+       lsa->len = sizeof(struct sockaddr_in6);
+       if (fd >= 0)
+               return fd;
 #endif
-       {
-               fd = xsocket(AF_INET, SOCK_STREAM, 0);
-               if (fp) *fp = AF_INET;
-       }
+       fd = xsocket(AF_INET, SOCK_STREAM, 0);
+       lsa->sa.sa_family = AF_INET;
+       lsa->len = sizeof(struct sockaddr_in);
        return fd;
 }
 
-int create_and_bind_socket_ip4or6(const char *hostaddr, int port)
+int create_and_bind_stream_or_die(const char *bindaddr, int port)
 {
        int fd;
-       sockaddr_inet sa;
+       len_and_sockaddr *lsa;
 
-       memset(&sa, 0, sizeof(sa));
-       if (hostaddr) {
-               if (dotted2sockaddr(hostaddr, &sa.sa, sizeof(sa)))
-                       bb_error_msg_and_die("bad address '%s'", hostaddr);
+       if (bindaddr) {
+               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(sa.sa.sa_family, SOCK_STREAM, 0);
-       } else 
-               fd = xsocket_stream_ip4or6(&sa.sa.sa_family);
+               fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
+       } else {
+               lsa = xzalloc(offsetof(len_and_sockaddr, sa) +
+                       USE_FEATURE_IPV6(sizeof(struct sockaddr_in6))
+                       SKIP_FEATURE_IPV6(sizeof(struct sockaddr_in))
+               );
+               fd = xsocket_stream_ip4or6(lsa);
+       }
        setsockopt_reuseaddr(fd);
+       xbind(fd, &lsa->sa, lsa->len);
+       free(lsa);
+       return fd;
+}
 
-       /* if (port >= 0) { */
-#if ENABLE_FEATURE_IPV6
-               if (sa.sa.sa_family == AF_INET6 /* && !sa.sin6.sin6_port */)
-                       sa.sin6.sin6_port = htons(port);
-#endif
-               if (sa.sa.sa_family == AF_INET /* && !sa.sin.sin_port */)
-                       sa.sin.sin_port = htons(port);
-       /* } */
+int create_and_connect_stream_or_die(const char *peer, int port)
+{
+       int fd;
+       len_and_sockaddr *lsa;
 
-       xbind(fd, &sa.sa, sizeof(sa));
+       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;
 }

diff --git a/networking/telnet.c b/networking/telnet.c
index e65b691..5ca64e1 100644 (file)
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -22,15 +22,7 @@
  */
 
 #include <termios.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <signal.h>
 #include <arpa/telnet.h>
-#include <sys/types.h>
-#include <sys/socket.h>
 #include <netinet/in.h>
 #include "busybox.h"
 
@@ -593,8 +585,9 @@ static void cookmode(void)
 
 int telnet_main(int argc, char** argv)
 {
+       char *host;
+       int port;
        int len;
-       struct sockaddr_in s_in;
 #ifdef USE_POLL
        struct pollfd ufds[2];
 #else
@@ -610,11 +603,10 @@ int telnet_main(int argc, char** argv)
        ttype = getenv("TERM");
 #endif
 
-       memset(&G, 0, sizeof G);
+       /* memset(&G, 0, sizeof G); - already is */
 
        if (tcgetattr(0, &G.termios_def) >= 0) {
                G.do_termios = 1;
-
                G.termios_raw = G.termios_def;
                cfmakeraw(&G.termios_raw);
        }
@@ -627,19 +619,18 @@ int telnet_main(int argc, char** argv)
                autologin = getenv("USER");
 
        if (optind < argc) {
-               bb_lookup_host(&s_in, argv[optind++]);
-               s_in.sin_port = bb_lookup_port((optind < argc) ? argv[optind++] :
+               host = argv[optind++];
+               port = bb_lookup_port((optind < argc) ? argv[optind++] :
                                "telnet", "tcp", 23);
                if (optind < argc)
                        bb_show_usage();
        } else
                bb_show_usage();
 #else
-       bb_lookup_host(&s_in, argv[1]);
-       s_in.sin_port = bb_lookup_port((argc == 3) ? argv[2] : "telnet", "tcp", 23);
+       host = argv[1];
+       port = bb_lookup_port((argc > 2) ? argv[2] : "telnet", "tcp", 23);
 #endif
-
-       G.netfd = xconnect_tcp_v4(&s_in);
+       G.netfd = create_and_connect_stream_or_die(host, port);
 
        setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
 
@@ -655,8 +646,7 @@ int telnet_main(int argc, char** argv)
        maxfd = G.netfd + 1;
 #endif
 
-       while (1)
-       {
+       while (1) {
 #ifndef USE_POLL
                fd_set rfds = readfds;
 
@@ -700,8 +690,7 @@ int telnet_main(int argc, char** argv)
                        {
                                len = read(G.netfd, G.buf, DATABUFSIZE);
 
-                               if (len <= 0)
-                               {
+                               if (len <= 0) {
                                        WriteCS(1, "Connection closed by foreign host.\r\n");
                                        doexit(1);
                                }

diff --git a/networking/telnetd.c b/networking/telnetd.c
index 604f65c..a0ee2c3 100644 (file)
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -414,7 +414,7 @@ telnetd_main(int argc, char **argv)
        if (IS_INETD) {
                sessions = make_new_session(0, 1);
        } else {
-               master_fd = create_and_bind_socket_ip4or6(opt_bindaddr, portnbr);
+               master_fd = create_and_bind_stream_or_die(opt_bindaddr, portnbr);
                xlisten(master_fd, 1);
                if (!(opt & OPT_FOREGROUND))
                        xdaemon(0, 0);