src/lib/fdpass.c

	fdpass.c revision 5e3d9f8af9ed0761469108fe2c6aa3af40817d83
2454dfa32c93c20a8522c6ed42fe057baaac9f9aStephan Bosch/*
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody fdpass.c - FD passing
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody    Copyright (c) 2002 Timo Sirainen
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody    Permission is hereby granted, free of charge, to any person obtaining
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody    a copy of this software and associated documentation files (the
42826d96c8d0bba9eddc85b01bf70d7db571ae7fPhil Carmody    "Software"), to deal in the Software without restriction, including
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    without limitation the rights to use, copy, modify, merge, publish,
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    distribute, sublicense, and/or sell copies of the Software, and to
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    permit persons to whom the Software is furnished to do so, subject to
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    the following conditions:
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    The above copyright notice and this permission notice shall be
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    included in all copies or substantial portions of the Software.
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody*/
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#ifdef __sun__
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#  define _XPG4_2
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#endif
62461eb609e1d852e027cf4e07d30d51288678a2Aki Tuomi
62461eb609e1d852e027cf4e07d30d51288678a2Aki Tuomi#include "lib.h"
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#include "network.h"
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#include "fdpass.h"
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#include <sys/un.h>
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#include <sys/uio.h>
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#if defined (__sun__) && !defined(CMSG_SPACE)
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#  define CMSG_ALIGN(len) \
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1))
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#  define CMSG_SPACE(len) \
62461eb609e1d852e027cf4e07d30d51288678a2Aki Tuomi    (CMSG_ALIGN(len) + CMSG_ALIGN(sizeof(struct cmsghdr)))
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#  define CMSG_LEN(len) \
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    (CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody#endif
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmodyint fd_send(int handle, int send_fd, const void *data, int size)
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody{
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        struct msghdr msg;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        struct iovec iov;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        struct cmsghdr *cmsg;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    int *fdptr;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        char buf[CMSG_SPACE(sizeof(int))];
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    memset(&msg, 0, sizeof (struct msghdr));
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        iov.iov_base = (void *) data;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        iov.iov_len = size;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        msg.msg_control = buf;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        msg.msg_controllen = sizeof(buf);
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        msg.msg_iov = &iov;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    msg.msg_iovlen = 1;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        cmsg = CMSG_FIRSTHDR(&msg);
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        cmsg->cmsg_level = SOL_SOCKET;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody        cmsg->cmsg_type = SCM_RIGHTS;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    cmsg->cmsg_len = CMSG_LEN(sizeof(int));
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    fdptr = (int *) CMSG_DATA(cmsg);
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    *fdptr = send_fd;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    return sendmsg(handle, &msg, 0);
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody}
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmodyint fd_read(int handle, void *data, int size, int *fd)
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody{
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    struct msghdr msg;
d6bbf85809664a810726b5c711c7213874d8df57Phil Carmody    struct iovec iov;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    struct cmsghdr *cmsg;
d6bbf85809664a810726b5c711c7213874d8df57Phil Carmody    int ret;
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    char buf[CMSG_SPACE(sizeof(int))];
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody    memset(&msg, 0, sizeof (struct msghdr));
629e96c5e2d4724b713ca7d62e59ed033107edcdPhil Carmody
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    msg.msg_control = buf;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    msg.msg_controllen = sizeof(buf);
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    msg.msg_iov = &iov;
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    msg.msg_iovlen = 1;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    cmsg = CMSG_FIRSTHDR(&msg);
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    cmsg->cmsg_level = SOL_SOCKET;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    cmsg->cmsg_type = SCM_RIGHTS;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    iov.iov_base = (void *) data;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch    iov.iov_len = size;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    ret = recvmsg(handle, &msg, 0);
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    *fd = *(int *) CMSG_DATA(cmsg);
87b4215acbf020aa5b8dea686b23fc664140cda0Stephan Bosch    return ret;
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch}
4a272f5b8bacf2852c2e53f3aa8e899e0d5c604fStephan Bosch