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-rw-r--r--nsock/src/nsock_connect.c652
1 files changed, 652 insertions, 0 deletions
diff --git a/nsock/src/nsock_connect.c b/nsock/src/nsock_connect.c
new file mode 100644
index 0000000..7d2b523
--- /dev/null
+++ b/nsock/src/nsock_connect.c
@@ -0,0 +1,652 @@
+/***************************************************************************
+ * nsock_connect.c -- This contains the functions for requesting TCP *
+ * connections from the nsock parallel socket event library *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#include "nsock.h"
+#include "nsock_internal.h"
+#include "nsock_log.h"
+#include "nsock_proxy.h"
+#include "netutils.h"
+
+#include <sys/types.h>
+#include <errno.h>
+#include <string.h>
+
+
+static int mksock_bind_addr(struct npool *ms, struct niod *iod) {
+ int rc;
+ int one = 1;
+
+ rc = setsockopt(iod->sd, SOL_SOCKET, SO_REUSEADDR, (const char *)&one, sizeof(one));
+ if (rc == -1) {
+ int err = socket_errno();
+
+ nsock_log_error("Setting of SO_REUSEADDR failed (#%li): %s (%d)", iod->id,
+ socket_strerror(err), err);
+ }
+
+ nsock_log_info("Binding to %s (IOD #%li)", get_localaddr_string(iod), iod->id);
+ rc = bind(iod->sd, (struct sockaddr *)&iod->local, (int) iod->locallen);
+ if (rc == -1) {
+ int err = socket_errno();
+
+ nsock_log_error("Bind to %s failed (IOD #%li): %s (%d)",
+ get_localaddr_string(iod), iod->id,
+ socket_strerror(err), err);
+ }
+ return 0;
+}
+
+static int mksock_set_ipopts(struct npool *ms, struct niod *iod) {
+ int rc;
+
+ errno = 0;
+ rc = setsockopt(iod->sd, IPPROTO_IP, IP_OPTIONS, (const char *)iod->ipopts,
+ iod->ipoptslen);
+ if (rc == -1) {
+ int err = socket_errno();
+
+ nsock_log_error("Setting of IP options failed (IOD #%li): %s (%d)",
+ iod->id, socket_strerror(err), err);
+ }
+ return 0;
+}
+
+static int mksock_bind_device(struct npool *ms, struct niod *iod) {
+ int rc;
+
+ rc = socket_bindtodevice(iod->sd, ms->device);
+ if (!rc) {
+ int err = socket_errno();
+
+ if (err != EPERM)
+ nsock_log_error("Setting of SO_BINDTODEVICE failed (IOD #%li): %s (%d)",
+ iod->id, socket_strerror(err), err);
+ else
+ nsock_log_debug_all("Setting of SO_BINDTODEVICE failed (IOD #%li): %s (%d)",
+ iod->id, socket_strerror(err), err);
+ }
+ return 0;
+}
+
+static int mksock_set_broadcast(struct npool *ms, struct niod *iod) {
+ int rc;
+ int one = 1;
+
+ rc = setsockopt(iod->sd, SOL_SOCKET, SO_BROADCAST,
+ (const char *)&one, sizeof(one));
+ if (rc == -1) {
+ int err = socket_errno();
+
+ nsock_log_error("Setting of SO_BROADCAST failed (IOD #%li): %s (%d)",
+ iod->id, socket_strerror(err), err);
+ }
+ return 0;
+}
+/* Create the actual socket (nse->iod->sd) underlying the iod. This unblocks the
+ * socket, binds to the localaddr address, sets IP options, and sets the
+ * broadcast flag. Trying to change these functions after making this call will
+ * not have an effect. This function needs to be called before you try to read
+ * or write on the iod. */
+static int nsock_make_socket(struct npool *ms, struct niod *iod, int family, int type, int proto) {
+
+ /* inheritable_socket is from nbase */
+ iod->sd = (int)inheritable_socket(family, type, proto);
+ if (iod->sd == -1) {
+ nsock_log_error("Socket trouble: %s", socket_strerror(socket_errno()));
+ return -1;
+ }
+
+ unblock_socket(iod->sd);
+
+ iod->lastproto = proto;
+
+ if (iod->locallen)
+ mksock_bind_addr(ms, iod);
+
+ if (iod->ipoptslen && family == AF_INET)
+ mksock_set_ipopts(ms, iod);
+
+ if (ms->device)
+ mksock_bind_device(ms, iod);
+
+ if (ms->broadcast && type != SOCK_STREAM)
+ mksock_set_broadcast(ms, iod);
+
+ /* mksock_* functions can raise warnings/errors
+ * but we don't let them stop us for now. */
+ return iod->sd;
+}
+
+int nsock_setup_udp(nsock_pool nsp, nsock_iod ms_iod, int af) {
+ struct npool *ms = (struct npool *)nsp;
+ struct niod *nsi = (struct niod *)ms_iod;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nsock_log_info("UDP unconnected socket (IOD #%li)", nsi->id);
+
+ if (nsock_make_socket(ms, nsi, af, SOCK_DGRAM, IPPROTO_UDP) == -1)
+ return -1;
+
+ return nsi->sd;
+}
+
+/* This does the actual logistics of requesting a connection. It is shared
+ * by nsock_connect_tcp and nsock_connect_ssl, among others */
+void nsock_connect_internal(struct npool *ms, struct nevent *nse, int type, int proto, struct sockaddr_storage *ss, size_t sslen,
+ unsigned int port) {
+
+ struct sockaddr_in *sin;
+#if HAVE_IPV6
+ struct sockaddr_in6 *sin6;
+#endif
+ struct niod *iod = nse->iod;
+
+ if (iod->px_ctx /* proxy enabled */
+ && proto == IPPROTO_TCP /* restrict proxying to TCP connections */
+ && (nse->handler != nsock_proxy_ev_dispatch)) { /* for reentrancy */
+ struct proxy_node *current;
+
+ nsock_log_debug_all("TCP connection request (EID %lu) redirected through proxy chain",
+ (long)nse->id);
+
+ current = iod->px_ctx->px_current;
+ assert(current != NULL);
+
+ memcpy(&iod->px_ctx->target_ss, ss, sslen);
+ iod->px_ctx->target_sslen = sslen;
+ iod->px_ctx->target_port = port;
+
+ ss = &current->ss;
+ sslen = current->sslen;
+ port = current->port;
+
+ iod->px_ctx->target_handler = nse->handler;
+ nse->handler = nsock_proxy_ev_dispatch;
+
+ iod->px_ctx->target_ev_type = nse->type;
+ nse->type = NSE_TYPE_CONNECT;
+ }
+
+ sin = (struct sockaddr_in *)ss;
+#if HAVE_IPV6
+ sin6 = (struct sockaddr_in6 *)ss;
+#endif
+
+ /* Now it is time to actually attempt the connection */
+ if (nsock_make_socket(ms, iod, ss->ss_family, type, proto) == -1) {
+ nse->event_done = 1;
+ nse->status = NSE_STATUS_ERROR;
+ nse->errnum = socket_errno();
+ } else {
+ if (ss->ss_family == AF_INET) {
+ sin->sin_port = htons(port);
+ }
+#if HAVE_IPV6
+ else if (ss->ss_family == AF_INET6) {
+ sin6->sin6_port = htons(port);
+ }
+#endif
+#if HAVE_SYS_UN_H
+ else if (ss->ss_family == AF_UNIX) {
+ /* Nothing more to do for Unix socket */
+ }
+#endif
+#if HAVE_LINUX_VM_SOCKETS_H
+ else if (ss->ss_family == AF_VSOCK) {
+ struct sockaddr_vm *svm = (struct sockaddr_vm *)ss;
+
+ svm->svm_port = port;
+ }
+#endif
+ else {
+ fatal("Unknown address family %d\n", ss->ss_family);
+ }
+
+ assert(sslen <= sizeof(iod->peer));
+ if (&iod->peer != ss)
+ memcpy(&iod->peer, ss, sslen);
+ iod->peerlen = sslen;
+
+ if (ms->engine->io_operations->iod_connect(ms, iod->sd, (struct sockaddr *)ss, sslen) == -1) {
+ int err = socket_errno();
+
+ if ((proto == IPPROTO_UDP) || (err != EINPROGRESS && err != EAGAIN)) {
+ nse->event_done = 1;
+ nse->status = NSE_STATUS_ERROR;
+ nse->errnum = err;
+ }
+ }
+ /* The callback handle_connect_result handles the connection once it completes. */
+ }
+}
+
+#if HAVE_SYS_UN_H
+
+/* Request a UNIX domain sockets connection to the same system (by path to socket).
+ * This function connects to the socket of type SOCK_STREAM. ss should be a
+ * sockaddr_storage, sockaddr_un as appropriate (just like what you would pass to
+ * connect). sslen should be the sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_unixsock_stream(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+ void *userdata, struct sockaddr *saddr, size_t sslen) {
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("UNIX domain socket (STREAM) connection requested to %s (IOD #%li) EID %li",
+ get_unixsock_path(ss), nsi->id, nse->id);
+
+ nsock_connect_internal(ms, nse, SOCK_STREAM, 0, ss, sslen, 0);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+
+}
+
+/* Request a UNIX domain sockets connection to the same system (by path to socket).
+ * This function connects to the socket of type SOCK_DGRAM. ss should be a
+ * sockaddr_storage, sockaddr_un as appropriate (just like what you would pass to
+ * connect). sslen should be the sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_unixsock_datagram(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler,
+ void *userdata, struct sockaddr *saddr, size_t sslen) {
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("UNIX domain socket (DGRAM) connection requested to %s (IOD #%li) EID %li",
+ get_unixsock_path(ss), nsi->id, nse->id);
+
+ nsock_connect_internal(ms, nse, SOCK_DGRAM, 0, ss, sslen, 0);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+
+#endif /* HAVE_SYS_UN_H */
+
+#if HAVE_LINUX_VM_SOCKETS_H
+/* Request a vsock stream connection to another system. ss should be a
+ * sockaddr_storage or sockaddr_vm, as appropriate (just like what you would
+ * pass to connect). sslen should be the sizeof the structure you are passing
+ * in. */
+nsock_event_id nsock_connect_vsock_stream(nsock_pool nsp, nsock_iod ms_iod,
+ nsock_ev_handler handler,
+ int timeout_msecs, void *userdata,
+ struct sockaddr *saddr, size_t sslen,
+ unsigned int port) {
+ struct niod *nsi = (struct niod *)ms_iod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+ struct sockaddr_vm *svm = (struct sockaddr_vm *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("vsock stream connection requested to %u:%u (IOD #%li) EID %li",
+ svm->svm_cid, port, nsi->id, nse->id);
+
+ /* Do the actual connect() */
+ nsock_connect_internal(ms, nse, SOCK_STREAM, 0, ss, sslen, port);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+
+/* Request a vsock datagram "connection" to another system. Since this is a
+ * datagram socket, no packets are actually sent. The destination CID and port
+ * are just associated with the nsiod (an actual OS connect() call is made).
+ * You can then use the normal nsock write calls on the socket. There is no
+ * timeout since this call always calls your callback at the next opportunity.
+ * The advantages to having a connected datagram socket (as opposed to just
+ * specifying an address with sendto() are that we can now use a consistent set
+ * of write/read calls for stream and datagram sockets, received packets from
+ * the non-partner are automatically dropped by the OS, and the OS can provide
+ * asynchronous errors (see Unix Network Programming pp224). ss should be a
+ * sockaddr_storage or sockaddr_vm, as appropriate (just like what you would
+ * pass to connect). sslen should be the sizeof the structure you are passing
+ * in. */
+nsock_event_id nsock_connect_vsock_datagram(nsock_pool nsp, nsock_iod nsiod,
+ nsock_ev_handler handler,
+ void *userdata,
+ struct sockaddr *saddr,
+ size_t sslen, unsigned int port) {
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+ struct sockaddr_vm *svm = (struct sockaddr_vm *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("vsock dgram connection requested to %u:%u (IOD #%li) EID %li",
+ svm->svm_cid, port, nsi->id, nse->id);
+
+ nsock_connect_internal(ms, nse, SOCK_DGRAM, 0, ss, sslen, port);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+#endif /* HAVE_LINUX_VM_SOCKETS_H */
+
+/* Request a TCP connection to another system (by IP address). The in_addr is
+ * normal network byte order, but the port number should be given in HOST BYTE
+ * ORDER. ss should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as
+ * appropriate (just like what you would pass to connect). sslen should be the
+ * sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_tcp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler, int timeout_msecs,
+ void *userdata, struct sockaddr *saddr, size_t sslen, unsigned short port) {
+ struct niod *nsi = (struct niod *)ms_iod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("TCP connection requested to %s:%hu (IOD #%li) EID %li",
+ inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+ /* Do the actual connect() */
+ nsock_connect_internal(ms, nse, SOCK_STREAM, IPPROTO_TCP, ss, sslen, port);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+
+/* Request an SCTP association to another system (by IP address). The in_addr
+ * is normal network byte order, but the port number should be given in HOST
+ * BYTE ORDER. ss should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as
+ * appropriate (just like what you would pass to connect). sslen should be the
+ * sizeof the structure you are passing in. */
+nsock_event_id nsock_connect_sctp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler, int timeout_msecs,
+ void *userdata, struct sockaddr *saddr, size_t sslen, unsigned short port) {
+
+ struct niod *nsi = (struct niod *)ms_iod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("SCTP association requested to %s:%hu (IOD #%li) EID %li",
+ inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+ /* Do the actual connect() */
+ nsock_connect_internal(ms, nse, SOCK_STREAM, IPPROTO_SCTP, ss, sslen, port);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+
+/* Request an SSL over TCP/SCTP/UDP connection to another system (by IP address).
+ * The in_addr is normal network byte order, but the port number should be given
+ * in HOST BYTE ORDER. This function will call back only after it has made the
+ * connection AND done the initial SSL negotiation. From that point on, you use
+ * the normal read/write calls and decryption will happen transparently. ss
+ * should be a sockaddr_storage, sockaddr_in6, or sockaddr_in as appropriate
+ * (just like what you would pass to connect). sslen should be the sizeof the
+ * structure you are passing in. */
+nsock_event_id nsock_connect_ssl(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+ void *userdata, struct sockaddr *saddr, size_t sslen, int proto, unsigned short port, nsock_ssl_session ssl_session) {
+
+#ifndef HAVE_OPENSSL
+ fatal("nsock_connect_ssl called - but nsock was built w/o SSL support. QUITTING");
+ return (nsock_event_id)0; /* UNREACHED */
+#else
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+
+ if (proto == IPPROTO_UDP)
+ {
+ if (!ms->dtlsctx)
+ nsock_pool_dtls_init(ms, 0);
+ }
+ else
+ {
+ if (!ms->sslctx)
+ nsock_pool_ssl_init(ms, 0);
+ }
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT_SSL, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ /* Set our SSL_SESSION so we can benefit from session-id reuse. */
+ /* but not with DTLS; save space in ClientHello message */
+ if (proto != IPPROTO_UDP)
+ nsi_set_ssl_session(nsi, (SSL_SESSION *)ssl_session);
+
+ if (proto == IPPROTO_UDP)
+ nsock_log_info("DTLS connection requested to %s:%hu/udp (IOD #%li) EID %li",
+
+ inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+ else
+ nsock_log_info("SSL connection requested to %s:%hu/%s (IOD #%li) EID %li",
+ inet_ntop_ez(ss, sslen), port, (proto == IPPROTO_TCP ? "tcp" : "sctp"),
+ nsi->id, nse->id);
+
+ /* Do the actual connect() */
+ nsock_connect_internal(ms, nse, (proto == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM), proto, ss, sslen, port);
+
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+#endif /* HAVE_OPENSSL */
+}
+
+/* Request ssl connection over already established connection. nsiod must be
+ * socket that is already connected to target using nsock_connect_tcp or
+ * nsock_connect_sctp. All parameters have the same meaning as in
+ * 'nsock_connect_ssl' */
+nsock_event_id nsock_reconnect_ssl(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, int timeout_msecs,
+ void *userdata, nsock_ssl_session ssl_session) {
+
+#ifndef HAVE_OPENSSL
+ fatal("nsock_reconnect_ssl called - but nsock was built w/o SSL support. QUITTING");
+ return (nsock_event_id) 0; /* UNREACHED */
+#else
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ /* nsock_reconnect_ssl not supported for DTLS (yet?) */
+ assert(nsi->lastproto != IPPROTO_UDP);
+
+ if (!ms->sslctx)
+ nsock_pool_ssl_init(ms, 0);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT_SSL, nsi, timeout_msecs, handler, userdata);
+ assert(nse);
+
+ /* Set our SSL_SESSION so we can benefit from session-id reuse. */
+ nsi_set_ssl_session(nsi, (SSL_SESSION *)ssl_session);
+
+ nsock_log_info("SSL reconnection requested (IOD #%li) EID %li",
+ nsi->id, nse->id);
+
+ /* Do the actual connect() */
+ nse->event_done = 0;
+ nse->status = NSE_STATUS_SUCCESS;
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+#endif /* HAVE_OPENSSL */
+}
+
+/* Request a UDP "connection" to another system (by IP address). The in_addr is
+ * normal network byte order, but the port number should be given in HOST BYTE
+ * ORDER. Since this is UDP, no packets are actually sent. The destination IP
+ * and port are just associated with the nsiod (an actual OS connect() call is
+ * made). You can then use the normal nsock write calls on the socket. There
+ * is no timeout since this call always calls your callback at the next
+ * opportunity. The advantages to having a connected UDP socket (as opposed to
+ * just specifying an address with sendto() are that we can now use a consistent
+ * set of write/read calls for TCP/UDP, received packets from the non-partner
+ * are automatically dropped by the OS, and the OS can provide asynchronous
+ * errors (see Unix Network Programming pp224). ss should be a
+ * sockaddr_storage, sockaddr_in6, or sockaddr_in as appropriate (just like what
+ * you would pass to connect). sslen should be the sizeof the structure you are
+ * passing in. */
+nsock_event_id nsock_connect_udp(nsock_pool nsp, nsock_iod nsiod, nsock_ev_handler handler, void *userdata,
+ struct sockaddr *saddr, size_t sslen, unsigned short port) {
+
+ struct niod *nsi = (struct niod *)nsiod;
+ struct npool *ms = (struct npool *)nsp;
+ struct nevent *nse;
+ struct sockaddr_storage *ss = (struct sockaddr_storage *)saddr;
+
+ assert(nsi->state == NSIOD_STATE_INITIAL || nsi->state == NSIOD_STATE_UNKNOWN);
+
+ nse = event_new(ms, NSE_TYPE_CONNECT, nsi, -1, handler, userdata);
+ assert(nse);
+
+ nsock_log_info("UDP connection requested to %s:%hu (IOD #%li) EID %li",
+ inet_ntop_ez(ss, sslen), port, nsi->id, nse->id);
+
+ nsock_connect_internal(ms, nse, SOCK_DGRAM, IPPROTO_UDP, ss, sslen, port);
+ nsock_pool_add_event(ms, nse);
+
+ return nse->id;
+}
+
+/* Returns that host/port/protocol information for the last communication (or
+ * comm. attempt) this nsi has been involved with. By "involved" with I mean
+ * interactions like establishing (or trying to) a connection or sending a UDP
+ * datagram through an unconnected nsock_iod. AF is the address family (AF_INET
+ * or AF_INET6), Protocl is IPPROTO_TCP or IPPROTO_UDP. Pass NULL for
+ * information you do not need. If ANY of the information you requested is not
+ * available, 0 will be returned and the unavailable sockets are zeroed. If
+ * protocol or af is requested but not available, it will be set to -1 (and 0
+ * returned). The pointers you pass in must be NULL or point to allocated
+ * address space. The sockaddr members should actually be sockaddr_storage,
+ * sockaddr_in6, or sockaddr_in with the socklen of them set appropriately (eg
+ * sizeof(sockaddr_storage) if that is what you are passing). */
+int nsock_iod_get_communication_info(nsock_iod iod, int *protocol, int *af,
+ struct sockaddr *local,
+ struct sockaddr *remote, size_t socklen) {
+ struct niod *nsi = (struct niod *)iod;
+ int ret = 1;
+ struct sockaddr_storage ss;
+ socklen_t slen = sizeof(ss);
+ int res;
+
+ assert(socklen > 0);
+
+ if (nsi->peerlen > 0) {
+ if (remote)
+ memcpy(remote, &(nsi->peer), MIN((unsigned)socklen, nsi->peerlen));
+ if (protocol) {
+ *protocol = nsi->lastproto;
+ if (*protocol == -1) res = 0;
+ }
+ if (af) {
+ *af = nsi->peer.ss_family;
+ }
+ if (local) {
+ if (nsi->sd >= 0) {
+ res = getsockname(nsi->sd, (struct sockaddr *)&ss, &slen);
+ if (res == -1) {
+ memset(local, 0, socklen);
+ ret = 0;
+ } else {
+ assert(slen > 0);
+ memcpy(local, &ss, MIN((unsigned)slen, socklen));
+ }
+ } else {
+ memset(local, 0, socklen);
+ ret = 0;
+ }
+ }
+ } else {
+ if (local || remote || protocol || af)
+ ret = 0;
+
+ if (remote)
+ memset(remote, 0, socklen);
+
+ if (local)
+ memset(local, 0, socklen);
+
+ if (protocol)
+ *protocol = -1;
+
+ if (af)
+ *af = -1;
+ }
+ return ret;
+}
+
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