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57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* Copyright (c) 2017-2023, Michael Santos <michael.santos@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "xmppipe.h"
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#include <fcntl.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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/* Retrieve the XMPP socket opened by libstrophe.
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*
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* Ideally getting the XMPP socket would be as simple as:
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*
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* state->conn->sock
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*
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* But xmpp_conn_t is defined as an opaque type.
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*
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* The alternative is hardcoding the offsets based on the libstrophe version.
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*/
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int xmppipe_conn_fd(xmppipe_state_t *state) {
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int fd;
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struct rlimit rl = {0};
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struct stat st = {0};
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if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
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return -1;
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for (fd = rl.rlim_cur; fd > STDERR_FILENO; fd--) {
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if (fcntl(fd, F_GETFD, 0) < 0)
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continue;
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if (fstat(fd, &st) < 0)
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return -1;
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if (!S_ISSOCK(st.st_mode))
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continue;
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return fd;
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}
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return -1;
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}
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