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153 lines
4.1 KiB
153 lines
4.1 KiB
/*
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Copyright (c) 2014 Martin Sustrik All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom
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the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "../../utils/err.h"
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#include "../../utils/wire.h"
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#if defined NN_HAVE_WINDOWS
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#include "../../utils/win.h"
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#else
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#include <unistd.h>
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#include <sys/socket.h>
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#ifndef __PNACL
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#include <sys/un.h>
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#else
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#include <glibc-compat/sys/un.h>
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#endif
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#endif
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#include "tcpmux.h"
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int tcpmux_listen (int port, const char *service)
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{
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int rc;
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int s;
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char ipcaddr [32];
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struct sockaddr_un unaddr;
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unsigned char buf [2];
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size_t sz;
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ssize_t ssz;
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/* Make a connection to wsmux daemon. */
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s = socket (AF_UNIX, SOCK_STREAM, 0);
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if (s < 0)
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return -1;
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snprintf (ipcaddr, sizeof (ipcaddr), "/tmp/tcpmux-%d.ipc", port);
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nn_assert (strlen (ipcaddr) < sizeof (unaddr.sun_path));
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unaddr.sun_family = AF_UNIX;
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strcpy (unaddr.sun_path, ipcaddr);
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rc = connect (s, (struct sockaddr*) &unaddr, sizeof (unaddr));
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if (rc != 0)
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return -1;
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/* Send the connection header. */
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sz = strlen (service);
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nn_puts (buf, sz);
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ssz = send (s, buf, 2, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == 2);
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ssz = send (s, service, sz, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == sz);
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/* Return the connection file descriptor to the user. */
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return s;
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}
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int tcpmux_accept (int s)
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{
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//int rc;
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ssize_t ssz;
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char c;
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struct iovec iov;
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struct msghdr hdr;
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struct cmsghdr *cmsg;
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iov.iov_base = &c;
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iov.iov_len = 1;
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memset (&hdr, 0, sizeof (hdr));
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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#ifndef NN_USE_MYMSG
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unsigned char buf [256];
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hdr.msg_control = buf;
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hdr.msg_controllen = sizeof (buf);
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#endif
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ssz = recvmsg (s, &hdr, 0);
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if (ssz < 0)
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return -1;
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nn_assert (ssz == 1);
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cmsg = CMSG_FIRSTHDR (&hdr);
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while (1) {
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nn_assert (cmsg);
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if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SP_HDR)
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break;
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cmsg = CMSG_NXTHDR (&hdr, cmsg);
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}
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nn_assert (cmsg->cmsg_len == CMSG_LEN (sizeof (int)));
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return *((int*) NN_CMSG_DATA (cmsg));
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}
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int tcpmux_connect (int s, const struct sockaddr *addr,
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socklen_t addrlen, const char *service)
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{
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int rc;
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size_t sz;
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ssize_t ssz;
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char c;
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char crlf [2];
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/* Establish the connection. */
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rc = connect (s, addr, addrlen);
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if (rc != 0)
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return -1;
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/* Send the TCPMUX header. */
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sz = strlen (service);
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ssz = send (s, service, sz, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == sz);
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ssz = send (s, "\x0d\x0a", 2, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == 2);
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/* Receive TCPMUX reply. */
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ssz = recv (s, &c, 1, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == 1);
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/* Failure. */
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if (c != '+') {
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close (s);
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errno = ECONNREFUSED;
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return -1;
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}
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/* Success. Get rid of CRLF. */
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ssz = recv (s, crlf, 2, 0);
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errno_assert (ssz >= 0);
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nn_assert (ssz == 2);
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nn_assert (crlf [0] == 0x0d && crlf [1] == 0x0a);
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return 0;
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}
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