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ee059c44fee65033ca82a858fc2f15eaff3eeea6
nmap/nsock/src/nsock_connect.c
dmiller d43df98ab1 Nsock: Use separate SSL_CTX for SSL vs DTLS
2022-08-25 16:29:49 +00:00

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/***************************************************************************
* 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) 1999-2022 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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