diff options
| -rw-r--r-- | Makefile.in | 4 | ||||
| -rw-r--r-- | cli-authpubkey.c | 2 | ||||
| -rw-r--r-- | cli-main.c | 4 | ||||
| -rw-r--r-- | cli-session.c | 7 | ||||
| -rw-r--r-- | cli-tcpfwd.c | 2 | ||||
| -rw-r--r-- | common-channel.c | 1 | ||||
| -rw-r--r-- | common-session.c | 1 | ||||
| -rw-r--r-- | dbutil.c | 549 | ||||
| -rw-r--r-- | dbutil.h | 30 | ||||
| -rw-r--r-- | netio.c | 598 | ||||
| -rw-r--r-- | netio.h | 46 | ||||
| -rw-r--r-- | packet.c | 51 | ||||
| -rw-r--r-- | packet.h | 4 | ||||
| -rw-r--r-- | session.h | 1 | ||||
| -rw-r--r-- | signkey.c | 4 | ||||
| -rw-r--r-- | svr-tcpfwd.c | 2 |
16 files changed, 661 insertions, 645 deletions
diff --git a/Makefile.in b/Makefile.in index 8cde521..452ef8d 100644 --- a/Makefile.in +++ b/Makefile.in @@ -40,12 +40,12 @@ SVROBJS=svr-kex.o svr-auth.o sshpty.o \ CLIOBJS=cli-main.o cli-auth.o cli-authpasswd.o cli-kex.o \ cli-session.o cli-runopts.o cli-chansession.o \ cli-authpubkey.o cli-tcpfwd.o cli-channel.o cli-authinteract.o \ - cli-agentfwd.o list.o + cli-agentfwd.o CLISVROBJS=common-session.o packet.o common-algo.o common-kex.o \ common-channel.o common-chansession.o termcodes.o loginrec.o \ tcp-accept.o listener.o process-packet.o \ - common-runopts.o circbuffer.o curve25519-donna.o + common-runopts.o circbuffer.o curve25519-donna.o list.o netio.o KEYOBJS=dropbearkey.o diff --git a/cli-authpubkey.c b/cli-authpubkey.c index 9fcc256..cdef36e 100644 --- a/cli-authpubkey.c +++ b/cli-authpubkey.c @@ -58,7 +58,7 @@ void recv_msg_userauth_pk_ok() { buffer* keybuf = NULL; char* algotype = NULL; unsigned int algolen; - int keytype; + enum signkey_type keytype; unsigned int remotelen; TRACE(("enter recv_msg_userauth_pk_ok")) @@ -30,6 +30,7 @@ #include "session.h" #include "dbrandom.h" #include "crypto_desc.h" +#include "netio.h" static void cli_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN; static void cli_dropbear_log(int priority, const char* format, va_list param); @@ -46,7 +47,6 @@ int main(int argc, char ** argv) { #endif int sock_in, sock_out; - char* error = NULL; struct dropbear_progress_connection *progress = NULL; _dropbear_exit = cli_dropbear_exit; @@ -73,7 +73,7 @@ int main(int argc, char ** argv) { } else #endif { - progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport, cli_connected, NULL); + progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport, cli_connected, &ses); sock_in = sock_out = -1; } diff --git a/cli-session.c b/cli-session.c index 8cd75f8..08f4ff5 100644 --- a/cli-session.c +++ b/cli-session.c @@ -37,6 +37,7 @@ #include "chansession.h" #include "agentfwd.h" #include "crypto_desc.h" +#include "netio.h" static void cli_remoteclosed(); static void cli_sessionloop(); @@ -95,11 +96,11 @@ static const struct ChanType *cli_chantypes[] = { void cli_connected(int result, int sock, void* userdata, const char *errstring) { - if (result == DROPBEAR_FAILURE) - { + struct sshsession *myses = userdata; + if (result == DROPBEAR_FAILURE) { dropbear_exit("Connect failed: %s", errstring); } - ses.sock_in = ses.sock_out = sock; + myses->sock_in = myses->sock_out = sock; update_channel_prio(); } diff --git a/cli-tcpfwd.c b/cli-tcpfwd.c index 3e87ffd..ec65f41 100644 --- a/cli-tcpfwd.c +++ b/cli-tcpfwd.c @@ -30,6 +30,7 @@ #include "runopts.h" #include "session.h" #include "ssh.h" +#include "netio.h" #ifdef ENABLE_CLI_REMOTETCPFWD static int newtcpforwarded(struct Channel * channel); @@ -215,7 +216,6 @@ static int newtcpforwarded(struct Channel * channel) { m_list_elem * iter = NULL; struct TCPFwdEntry *fwd; char portstring[NI_MAXSERV]; - int sock; int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; origaddr = buf_getstring(ses.payload, NULL); diff --git a/common-channel.c b/common-channel.c index 40f8613..5e32cc3 100644 --- a/common-channel.c +++ b/common-channel.c @@ -35,6 +35,7 @@ #include "ssh.h" #include "listener.h" #include "runopts.h" +#include "netio.h" static void send_msg_channel_open_failure(unsigned int remotechan, int reason, const unsigned char *text, const unsigned char *lang); diff --git a/common-session.c b/common-session.c index d95c2ee..46aef0d 100644 --- a/common-session.c +++ b/common-session.c @@ -34,6 +34,7 @@ #include "kex.h" #include "channel.h" #include "runopts.h" +#include "netio.h" static void checktimeouts(); static long select_timeout(); @@ -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; -} @@ -63,19 +63,7 @@ void debug_start_net(); extern int debug_trace; #endif -enum dropbear_prio { - DROPBEAR_PRIO_DEFAULT = 10, - DROPBEAR_PRIO_LOWDELAY = 11, - DROPBEAR_PRIO_BULK = 12, -}; - char * stripcontrol(const char * text); -void get_socket_address(int fd, char **local_host, char **local_port, - char **remote_host, char **remote_port, int host_lookup); -void getaddrstring(struct sockaddr_storage* addr, - char **ret_host, char **ret_port, int host_lookup); -void set_sock_nodelay(int sock); -void set_sock_priority(int sock, enum dropbear_prio prio); #if defined(__linux__) && HAVE_SENDMSG #define DROPBEAR_TCP_FAST_OPEN @@ -89,8 +77,6 @@ void set_listen_fast_open(int sock); #endif #endif -int dropbear_listen(const char* address, const char* port, - int *socks, unsigned int sockcount, char **errstring, int *maxfd); int spawn_command(void(*exec_fn)(void *user_data), void *exec_data, int *writefd, int *readfd, int *errfd, pid_t *pid); void run_shell_command(const char* cmd, unsigned int maxfd, char* usershell); @@ -125,21 +111,5 @@ time_t monotonic_now(); char * expand_tilde(const char *inpath); -struct dropbear_progress_connection; - -/* result is DROPBEAR_SUCCESS or DROPBEAR_FAILURE. -errstring is only set on DROPBEAR_FAILURE, returns failure message for the last attempted socket */ -typedef void(*connect_callback)(int result, int sock, void* data, const char* errstring); - -struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport, - connect_callback cb, void *cb_data); - -void set_connect_fds(fd_set *writefd); -void handle_connect_fds(fd_set *writefd); - -/* Doesn't actually stop the connect, but adds a dummy callback instead */ -void cancel_connect(struct dropbear_progress_connection *c); - -void connect_set_writequeue(struct dropbear_progress_connection *c, struct Queue *writequeue); #endif /* _DBUTIL_H_ */ @@ -0,0 +1,598 @@ +#include "netio.h" +#include "list.h" +#include "dbutil.h" +#include "session.h" +#include "debug.h" + +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; +}; + +#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 + + +/* 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) { + 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) { + 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 { + close(c->sock); + c->sock = -1; + continue; + } + } + + break; /* Success. Treated the same as EINPROGRESS */ +#endif +#else + { + struct msghdr message; + int res = 0; + 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) { + 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; +} + +struct iovec * packet_queue_to_iovec(struct Queue *queue, int *ret_iov_count) { + struct iovec *iov = NULL; + struct Link *l; + unsigned int i, packet_type; + int len; + buffer *writebuf; + + #ifndef IOV_MAX + #define IOV_MAX UIO_MAXIOV + #endif + + *ret_iov_count = MIN(queue->count, IOV_MAX); + + iov = m_malloc(sizeof(*iov) * *ret_iov_count); + for (l = queue->head, i = 0; l; l = l->link, i++) + { + writebuf = (buffer*)l->item; + packet_type = writebuf->data[writebuf->len-1]; + len = writebuf->len - 1 - writebuf->pos; + dropbear_assert(len > 0); + TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type, + len, writebuf->len-1)) + iov[i].iov_base = buf_getptr(writebuf, len); + iov[i].iov_len = len; + } + + return iov; +} + +void packet_queue_consume(struct Queue *queue, ssize_t written) { + buffer *writebuf; + int len; + while (written > 0) { + writebuf = (buffer*)examine(queue); + len = writebuf->len - 1 - writebuf->pos; + if (len > written) { + /* partial buffer write */ + buf_incrpos(writebuf, written); + written = 0; + } else { + written -= len; + dequeue(queue); + buf_free(writebuf); + } + } +} + +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; +} + +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); + } +} + @@ -0,0 +1,46 @@ +#ifndef DROPBEAR_NETIO_H +#define DROPBEAR_NETIO_H + +#include "includes.h" +#include "buffer.h" +#include "queue.h" + +enum dropbear_prio { + DROPBEAR_PRIO_DEFAULT = 10, + DROPBEAR_PRIO_LOWDELAY = 11, + DROPBEAR_PRIO_BULK = 12, +}; + +void set_sock_nodelay(int sock); +void set_sock_priority(int sock, enum dropbear_prio prio); + +void get_socket_address(int fd, char **local_host, char **local_port, + char **remote_host, char **remote_port, int host_lookup); +void getaddrstring(struct sockaddr_storage* addr, + char **ret_host, char **ret_port, int host_lookup); +int dropbear_listen(const char* address, const char* port, + int *socks, unsigned int sockcount, char **errstring, int *maxfd); + +struct dropbear_progress_connection; + +/* result is DROPBEAR_SUCCESS or DROPBEAR_FAILURE. +errstring is only set on DROPBEAR_FAILURE, returns failure message for the last attempted socket */ +typedef void(*connect_callback)(int result, int sock, void* data, const char* errstring); + +struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport, + connect_callback cb, void *cb_data); + +void set_connect_fds(fd_set *writefd); +void handle_connect_fds(fd_set *writefd); + +/* Doesn't actually stop the connect, but adds a dummy callback instead */ +void cancel_connect(struct dropbear_progress_connection *c); + +void connect_set_writequeue(struct dropbear_progress_connection *c, struct Queue *writequeue); + +/* TODO: writev #ifdef guard */ +struct iovec * packet_queue_to_iovec(struct Queue *queue, int *ret_iov_count); +void packet_queue_consume(struct Queue *queue, ssize_t written); + +#endif + @@ -34,6 +34,7 @@ #include "service.h" #include "auth.h" #include "channel.h" +#include "netio.h" static int read_packet_init(); static void make_mac(unsigned int seqno, const struct key_context_directional * key_state, @@ -52,60 +53,10 @@ static buffer* buf_decompress(buffer* buf, unsigned int len); static void buf_compress(buffer * dest, buffer * src, unsigned int len); #endif -struct iovec * packet_queue_to_iovec(struct Queue *queue, int *ret_iov_count) { - struct iovec *iov = NULL; - struct Link *l; - unsigned int i, packet_type; - int len; - buffer *writebuf; - - #ifndef IOV_MAX - #define IOV_MAX UIO_MAXIOV - #endif - - *ret_iov_count = MIN(queue->count, IOV_MAX); - - iov = m_malloc(sizeof(*iov) * *ret_iov_count); - for (l = queue->head, i = 0; l; l = l->link, i++) - { - writebuf = (buffer*)l->item; - packet_type = writebuf->data[writebuf->len-1]; - len = writebuf->len - 1 - writebuf->pos; - dropbear_assert(len > 0); - TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type, - len, writebuf->len-1)) - iov[i].iov_base = buf_getptr(writebuf, len); - iov[i].iov_len = len; - } - - return iov; -} - -void packet_queue_consume(struct Queue *queue, ssize_t written) { - buffer *writebuf; - int len; - while (written > 0) { - writebuf = (buffer*)examine(queue); - len = writebuf->len - 1 - writebuf->pos; - if (len > written) { - /* partial buffer write */ - buf_incrpos(writebuf, written); - written = 0; - } else { - written -= len; - dequeue(queue); - buf_free(writebuf); - } - } -} - /* non-blocking function writing out a current encrypted packet */ void write_packet() { ssize_t written; - int len; - buffer * writebuf = NULL; - unsigned packet_type; #ifdef HAVE_WRITEV struct iovec *iov = NULL; int iov_count; @@ -47,8 +47,4 @@ typedef struct PacketType { #define INIT_READBUF 128 -/* TODO: writev #ifdef guard */ -struct iovec * packet_queue_to_iovec(struct Queue *queue, int *ret_iov_count); -void packet_queue_consume(struct Queue *queue, ssize_t written); - #endif /* _PACKET_H_ */ @@ -38,6 +38,7 @@ #include "tcpfwd.h" #include "chansession.h" #include "dbutil.h" +#include "netio.h" extern int sessinitdone; /* Is set to 0 somewhere */ extern int exitflag; @@ -140,7 +140,7 @@ int buf_get_pub_key(buffer *buf, sign_key *key, enum signkey_type *type) { unsigned char* ident; unsigned int len; - int keytype; + enum signkey_type keytype; int ret = DROPBEAR_FAILURE; TRACE2(("enter buf_get_pub_key")) @@ -210,7 +210,7 @@ int buf_get_priv_key(buffer *buf, sign_key *key, enum signkey_type *type) { unsigned char* ident; unsigned int len; - int keytype; + enum signkey_type keytype; int ret = DROPBEAR_FAILURE; TRACE2(("enter buf_get_priv_key")) diff --git a/svr-tcpfwd.c b/svr-tcpfwd.c index 8f364b5..b3928bc 100644 --- a/svr-tcpfwd.c +++ b/svr-tcpfwd.c @@ -33,6 +33,7 @@ #include "listener.h" #include "runopts.h" #include "auth.h" +#include "netio.h" #ifndef ENABLE_SVR_REMOTETCPFWD @@ -236,7 +237,6 @@ static int newtcpdirect(struct Channel * channel) { unsigned char* orighost = NULL; unsigned int origport; char portstring[NI_MAXSERV]; - int sock; int len; int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |