diff options
Diffstat (limited to 'dbutil.c')
| -rw-r--r-- | dbutil.c | 549 |
1 files changed, 0 insertions, 549 deletions
@@ -213,193 +213,6 @@ void dropbear_trace2(const char* format, ...) { } #endif /* DEBUG_TRACE */ -void set_sock_nodelay(int sock) { - int val; - - /* disable nagle */ - val = 1; - setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val)); -} - -#ifdef DROPBEAR_TCP_FAST_OPEN -void set_listen_fast_open(int sock) { - int qlen = MAX(MAX_UNAUTH_PER_IP, 5); - if (setsockopt(sock, SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen)) != 0) { - TRACE(("set_listen_fast_open failed for socket %d: %s", sock, strerror(errno))) - } -} - -#endif - -void set_sock_priority(int sock, enum dropbear_prio prio) { - - int iptos_val = 0, so_prio_val = 0, rc; - - /* Don't log ENOTSOCK errors so that this can harmlessly be called - * on a client '-J' proxy pipe */ - - /* set the TOS bit for either ipv4 or ipv6 */ -#ifdef IPTOS_LOWDELAY - if (prio == DROPBEAR_PRIO_LOWDELAY) { - iptos_val = IPTOS_LOWDELAY; - } else if (prio == DROPBEAR_PRIO_BULK) { - iptos_val = IPTOS_THROUGHPUT; - } -#if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS) - rc = setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, (void*)&iptos_val, sizeof(iptos_val)); - if (rc < 0 && errno != ENOTSOCK) { - TRACE(("Couldn't set IPV6_TCLASS (%s)", strerror(errno))); - } -#endif - rc = setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&iptos_val, sizeof(iptos_val)); - if (rc < 0 && errno != ENOTSOCK) { - TRACE(("Couldn't set IP_TOS (%s)", strerror(errno))); - } -#endif - -#ifdef SO_PRIORITY - if (prio == DROPBEAR_PRIO_LOWDELAY) { - so_prio_val = TC_PRIO_INTERACTIVE; - } else if (prio == DROPBEAR_PRIO_BULK) { - so_prio_val = TC_PRIO_BULK; - } - /* linux specific, sets QoS class. see tc-prio(8) */ - rc = setsockopt(sock, SOL_SOCKET, SO_PRIORITY, (void*) &so_prio_val, sizeof(so_prio_val)); - if (rc < 0 && errno != ENOTSOCK) - dropbear_log(LOG_WARNING, "Couldn't set SO_PRIORITY (%s)", - strerror(errno)); -#endif - -} - -/* Listen on address:port. - * Special cases are address of "" listening on everything, - * and address of NULL listening on localhost only. - * Returns the number of sockets bound on success, or -1 on failure. On - * failure, if errstring wasn't NULL, it'll be a newly malloced error - * string.*/ -int dropbear_listen(const char* address, const char* port, - int *socks, unsigned int sockcount, char **errstring, int *maxfd) { - - struct addrinfo hints, *res = NULL, *res0 = NULL; - int err; - unsigned int nsock; - struct linger linger; - int val; - int sock; - - TRACE(("enter dropbear_listen")) - - memset(&hints, 0, sizeof(hints)); - hints.ai_family = AF_UNSPEC; /* TODO: let them flag v4 only etc */ - hints.ai_socktype = SOCK_STREAM; - - /* for calling getaddrinfo: - address == NULL and !AI_PASSIVE: local loopback - address == NULL and AI_PASSIVE: all interfaces - address != NULL: whatever the address says */ - if (!address) { - TRACE(("dropbear_listen: local loopback")) - } else { - if (address[0] == '\0') { - TRACE(("dropbear_listen: all interfaces")) - address = NULL; - } - hints.ai_flags = AI_PASSIVE; - } - err = getaddrinfo(address, port, &hints, &res0); - - if (err) { - if (errstring != NULL && *errstring == NULL) { - int len; - len = 20 + strlen(gai_strerror(err)); - *errstring = (char*)m_malloc(len); - snprintf(*errstring, len, "Error resolving: %s", gai_strerror(err)); - } - if (res0) { - freeaddrinfo(res0); - res0 = NULL; - } - TRACE(("leave dropbear_listen: failed resolving")) - return -1; - } - - - nsock = 0; - for (res = res0; res != NULL && nsock < sockcount; - res = res->ai_next) { - - /* Get a socket */ - socks[nsock] = socket(res->ai_family, res->ai_socktype, - res->ai_protocol); - - sock = socks[nsock]; /* For clarity */ - - if (sock < 0) { - err = errno; - TRACE(("socket() failed")) - continue; - } - - /* Various useful socket options */ - val = 1; - /* set to reuse, quick timeout */ - setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &val, sizeof(val)); - linger.l_onoff = 1; - linger.l_linger = 5; - setsockopt(sock, SOL_SOCKET, SO_LINGER, (void*)&linger, sizeof(linger)); - -#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY) - if (res->ai_family == AF_INET6) { - int on = 1; - if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, - &on, sizeof(on)) == -1) { - dropbear_log(LOG_WARNING, "Couldn't set IPV6_V6ONLY"); - } - } -#endif - - set_sock_nodelay(sock); - - if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) { - err = errno; - close(sock); - TRACE(("bind(%s) failed", port)) - continue; - } - - if (listen(sock, DROPBEAR_LISTEN_BACKLOG) < 0) { - err = errno; - close(sock); - TRACE(("listen() failed")) - continue; - } - - *maxfd = MAX(*maxfd, sock); - - nsock++; - } - - if (res0) { - freeaddrinfo(res0); - res0 = NULL; - } - - if (nsock == 0) { - if (errstring != NULL && *errstring == NULL) { - int len; - len = 20 + strlen(strerror(err)); - *errstring = (char*)m_malloc(len); - snprintf(*errstring, len, "Error listening: %s", strerror(err)); - } - TRACE(("leave dropbear_listen: failure, %s", strerror(err))) - return -1; - } - - TRACE(("leave dropbear_listen: success, %d socks bound", nsock)) - return nsock; -} - /* Connect to a given unix socket. The socket is blocking */ #ifdef ENABLE_CONNECT_UNIX int connect_unix(const char* path) { @@ -423,22 +236,6 @@ int connect_unix(const char* path) { } #endif -#if defined(__linux__) && defined(TCP_DEFER_ACCEPT) -static void set_piggyback_ack(int sock) { - /* Undocumented Linux feature - set TCP_DEFER_ACCEPT and data will be piggybacked - on the 3rd packet (ack) of the TCP handshake. Saves a IP packet. - http://thread.gmane.org/gmane.linux.network/224627/focus=224727 - "Piggyback the final ACK of the three way TCP connection establishment with the data" */ - int val = 1; - /* No error checking, this is opportunistic */ - int err = setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, (void*)&val, sizeof(val)); - if (err) - { - TRACE(("Failed setsockopt TCP_DEFER_ACCEPT: %s", strerror(errno))) - } -} -#endif - /* Sets up a pipe for a, returning three non-blocking file descriptors * and the pid. exec_fn is the function that will actually execute the child process, * it will be run after the child has fork()ed, and is passed exec_data. @@ -574,88 +371,6 @@ void run_shell_command(const char* cmd, unsigned int maxfd, char* usershell) { execv(usershell, argv); } -void get_socket_address(int fd, char **local_host, char **local_port, - char **remote_host, char **remote_port, int host_lookup) -{ - struct sockaddr_storage addr; - socklen_t addrlen; - - if (local_host || local_port) { - addrlen = sizeof(addr); - if (getsockname(fd, (struct sockaddr*)&addr, &addrlen) < 0) { - dropbear_exit("Failed socket address: %s", strerror(errno)); - } - getaddrstring(&addr, local_host, local_port, host_lookup); - } - if (remote_host || remote_port) { - addrlen = sizeof(addr); - if (getpeername(fd, (struct sockaddr*)&addr, &addrlen) < 0) { - dropbear_exit("Failed socket address: %s", strerror(errno)); - } - getaddrstring(&addr, remote_host, remote_port, host_lookup); - } -} - -/* Return a string representation of the socket address passed. The return - * value is allocated with malloc() */ -void getaddrstring(struct sockaddr_storage* addr, - char **ret_host, char **ret_port, - int host_lookup) { - - char host[NI_MAXHOST+1], serv[NI_MAXSERV+1]; - unsigned int len; - int ret; - - int flags = NI_NUMERICSERV | NI_NUMERICHOST; - -#ifndef DO_HOST_LOOKUP - host_lookup = 0; -#endif - - if (host_lookup) { - flags = NI_NUMERICSERV; - } - - len = sizeof(struct sockaddr_storage); - /* Some platforms such as Solaris 8 require that len is the length - * of the specific structure. Some older linux systems (glibc 2.1.3 - * such as debian potato) have sockaddr_storage.__ss_family instead - * but we'll ignore them */ -#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY - if (addr->ss_family == AF_INET) { - len = sizeof(struct sockaddr_in); - } -#ifdef AF_INET6 - if (addr->ss_family == AF_INET6) { - len = sizeof(struct sockaddr_in6); - } -#endif -#endif - - ret = getnameinfo((struct sockaddr*)addr, len, host, sizeof(host)-1, - serv, sizeof(serv)-1, flags); - - if (ret != 0) { - if (host_lookup) { - /* On some systems (Darwin does it) we get EINTR from getnameinfo - * somehow. Eew. So we'll just return the IP, since that doesn't seem - * to exhibit that behaviour. */ - getaddrstring(addr, ret_host, ret_port, 0); - return; - } else { - /* if we can't do a numeric lookup, something's gone terribly wrong */ - dropbear_exit("Failed lookup: %s", gai_strerror(ret)); - } - } - - if (ret_host) { - *ret_host = m_strdup(host); - } - if (ret_port) { - *ret_port = m_strdup(serv); - } -} - #ifdef DEBUG_TRACE void printhex(const char * label, const unsigned char * buf, int len) { @@ -981,267 +696,3 @@ time_t monotonic_now() { } -struct dropbear_progress_connection -{ - struct addrinfo *res; - struct addrinfo *res_iter; - - char *remotehost, *remoteport; /* For error reporting */ - - connect_callback cb; - void *cb_data; - - struct Queue *writequeue; /* A queue of encrypted packets to send with TCP fastopen, - or NULL. */ - - int sock; - - char* errstring; -}; - -/* Deallocate a progress connection. Removes from the pending list if iter!=NULL. -Does not close sockets */ -static void remove_connect(struct dropbear_progress_connection *c, m_list_elem *iter) { - if (c->res) { - freeaddrinfo(c->res); - } - m_free(c->remotehost); - m_free(c->remoteport); - m_free(c->errstring); - m_free(c); - - if (iter) { - list_remove(iter); - } -} - -static void cancel_callback(int result, int sock, void* UNUSED(data), const char* UNUSED(errstring)) { - if (result == DROPBEAR_SUCCESS) - { - m_close(sock); - } -} - -void cancel_connect(struct dropbear_progress_connection *c) { - c->cb = cancel_callback; - c->cb_data = NULL; -} - -static void connect_try_next(struct dropbear_progress_connection *c) { - int err = EADDRNOTAVAIL; - struct addrinfo *r; - - if (!c->res_iter) { - return; - } - - for (r = c->res_iter; r; r = r->ai_next) - { - assert(c->sock == -1); - - c->sock = socket(c->res_iter->ai_family, c->res_iter->ai_socktype, c->res_iter->ai_protocol); - if (c->sock < 0) { - err = errno; - continue; - } - - ses.maxfd = MAX(ses.maxfd, c->sock); - setnonblocking(c->sock); - -#if defined(__linux__) && defined(TCP_DEFER_ACCEPT) - //set_piggyback_ack(c->sock); -#endif - -#ifdef PROGRESS_CONNECT_FALLBACK -#if 0 - if (connect(c->sock, r->ai_addr, r->ai_addrlen) < 0) { - if (errno == EINPROGRESS) { - TRACE(("Connect in progress")) - break; - } else { - err = errno; - close(c->sock); - c->sock = -1; - continue; - } - } - - break; /* Success. Treated the same as EINPROGRESS */ -#endif -#else - { - struct msghdr message; - int flags; - int res; - memset(&message, 0x0, sizeof(message)); - message.msg_name = r->ai_addr; - message.msg_namelen = r->ai_addrlen; - - if (c->writequeue) { - int iovlen; /* Linux msg_iovlen is a size_t */ - message.msg_iov = packet_queue_to_iovec(c->writequeue, &iovlen); - message.msg_iovlen = iovlen; - res = sendmsg(c->sock, &message, MSG_FASTOPEN); - if (res < 0 && errno == EOPNOTSUPP) { - TRACE(("Fastopen not supported")); - /* No kernel MSG_FASTOPEN support. Fall back below */ - c->writequeue = NULL; - } - m_free(message.msg_iov); - if (res > 0) { - packet_queue_consume(c->writequeue, res); - } - } - - if (!c->writequeue) { - res = connect(c->sock, r->ai_addr, r->ai_addrlen); - } - if (res < 0 && errno != EINPROGRESS) { - err = errno; - close(c->sock); - c->sock = -1; - continue; - } else { - break; - } - } -#endif - } - - - if (r) { - c->res_iter = r->ai_next; - } else { - c->res_iter = NULL; - } - - if (c->sock >= 0 || (errno == EINPROGRESS)) { - /* Success */ - set_sock_nodelay(c->sock); - return; - } else { - if (!c->res_iter) - { - - } - /* XXX - returning error message through */ -#if 0 - /* Failed */ - if (errstring != NULL && *errstring == NULL) { - int len; - len = 20 + strlen(strerror(err)); - *errstring = (char*)m_malloc(len); - snprintf(*errstring, len, "Error connecting: %s", strerror(err)); - } - TRACE(("Error connecting: %s", strerror(err))) -#endif - } -} - -/* Connect via TCP to a host. */ -struct dropbear_progress_connection *connect_remote(const char* remotehost, const char* remoteport, - connect_callback cb, void* cb_data) -{ - struct dropbear_progress_connection *c = NULL; - int err; - struct addrinfo hints; - - c = m_malloc(sizeof(*c)); - c->remotehost = m_strdup(remotehost); - c->remoteport = m_strdup(remoteport); - c->sock = -1; - c->cb = cb; - c->cb_data = cb_data; - - list_append(&ses.conn_pending, c); - - memset(&hints, 0, sizeof(hints)); - hints.ai_socktype = SOCK_STREAM; - hints.ai_family = PF_UNSPEC; - - err = getaddrinfo(remotehost, remoteport, &hints, &c->res); - if (err) { - int len; - len = 100 + strlen(gai_strerror(err)); - c->errstring = (char*)m_malloc(len); - snprintf(c->errstring, len, "Error resolving '%s' port '%s'. %s", - remotehost, remoteport, gai_strerror(err)); - TRACE(("Error resolving: %s", gai_strerror(err))) - return NULL; - } - - c->res_iter = c->res; - - return c; -} - - -void set_connect_fds(fd_set *writefd) { - m_list_elem *iter; - TRACE(("enter handle_connect_fds")) - for (iter = ses.conn_pending.first; iter; iter = iter->next) { - struct dropbear_progress_connection *c = iter->item; - /* Set one going */ - while (c->res_iter && c->sock < 0) - { - connect_try_next(c); - } - if (c->sock >= 0) { - FD_SET(c->sock, writefd); - } else { - m_list_elem *remove_iter; - /* Final failure */ - if (!c->errstring) { - c->errstring = m_strdup("unexpected failure"); - } - c->cb(DROPBEAR_FAILURE, -1, c->cb_data, c->errstring); - /* Safely remove without invalidating iter */ - remove_iter = iter; - iter = iter->prev; - remove_connect(c, remove_iter); - } - } -} - -void handle_connect_fds(fd_set *writefd) { - m_list_elem *iter; - TRACE(("enter handle_connect_fds")) - for (iter = ses.conn_pending.first; iter; iter = iter->next) { - int val; - socklen_t vallen = sizeof(val); - struct dropbear_progress_connection *c = iter->item; - - if (!FD_ISSET(c->sock, writefd)) { - continue; - } - - TRACE(("handling %s port %s socket %d", c->remotehost, c->remoteport, c->sock)); - - if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &val, &vallen) != 0) { - TRACE(("handle_connect_fds getsockopt(%d) SO_ERROR failed: %s", c->sock, strerror(errno))) - /* This isn't expected to happen - Unix has surprises though, continue gracefully. */ - m_close(c->sock); - c->sock = -1; - } else if (val != 0) { - /* Connect failed */ - TRACE(("connect to %s port %s failed.", c->remotehost, c->remoteport)) - m_close(c->sock); - c->sock = -1; - - m_free(c->errstring); - c->errstring = strerror(val); - } else { - /* New connection has been established */ - c->cb(DROPBEAR_SUCCESS, c->sock, c->cb_data, NULL); - remove_connect(c, iter); - TRACE(("leave handle_connect_fds - success")) - /* Must return here - remove_connect() invalidates iter */ - return; - } - } - TRACE(("leave handle_connect_fds - end iter")) -} - -void connect_set_writequeue(struct dropbear_progress_connection *c, struct Queue *writequeue) { - c->writequeue = writequeue; -} |