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      1 /*
      2 Copyright (c) 2012, The Linux Foundation. All rights reserved.
      3 
      4 Redistribution and use in source and binary forms, with or without
      5 modification, are permitted provided that the following conditions are
      6 met:
      7     * Redistributions of source code must retain the above copyright
      8       notice, this list of conditions and the following disclaimer.
      9     * Redistributions in binary form must reproduce the above
     10       copyright notice, this list of conditions and the following
     11       disclaimer in the documentation and/or other materials provided
     12       with the distribution.
     13     * Neither the name of The Linux Foundation nor the names of its
     14       contributors may be used to endorse or promote products derived
     15       from this software without specific prior written permission.
     16 
     17 THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
     18 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
     20 ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
     21 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     24 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     25 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     26 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     27 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 */
     29 
     30 #include <stdio.h>
     31 #include <unistd.h>
     32 #include <stdlib.h>
     33 #include <errno.h>
     34 #include <string.h>
     35 #include <sys/socket.h>
     36 #include <sys/uio.h>
     37 #include <linux/un.h>
     38 
     39 #include "mm_camera_dbg.h"
     40 #include "mm_camera_sock.h"
     41 
     42 /*===========================================================================
     43  * FUNCTION    - mm_camera_socket_create -
     44  *
     45  * DESCRIPTION: opens a domain socket tied to camera ID and socket type
     46  *                        int cam_id: camera ID
     47   *                       mm_camera_sock_type_t sock_type: socket type, TCP/UDP
     48  * retured fd related to the domain socket
     49  *==========================================================================*/
     50 int mm_camera_socket_create(int cam_id, mm_camera_sock_type_t sock_type)
     51 {
     52     int socket_fd;
     53     struct sockaddr_un sock_addr;
     54     int sktype;
     55     int rc;
     56 
     57     switch (sock_type)
     58     {
     59       case MM_CAMERA_SOCK_TYPE_UDP:
     60         sktype = SOCK_DGRAM;
     61         break;
     62       case MM_CAMERA_SOCK_TYPE_TCP:
     63         sktype = SOCK_STREAM;
     64         break;
     65       default:
     66         CDBG_ERROR("%s: unknown socket type =%d", __func__, sock_type);
     67         return -1;
     68     }
     69     socket_fd = socket(AF_UNIX, sktype, 0);
     70     if (socket_fd < 0) {
     71         CDBG_ERROR("%s: error create socket fd =%d", __func__, socket_fd);
     72         return socket_fd;
     73     }
     74 
     75     memset(&sock_addr, 0, sizeof(sock_addr));
     76     sock_addr.sun_family = AF_UNIX;
     77     snprintf(sock_addr.sun_path, UNIX_PATH_MAX, "/data/cam_socket%d", cam_id);
     78     if((rc = connect(socket_fd, (struct sockaddr *) &sock_addr,
     79       sizeof(sock_addr))) != 0) {
     80       close(socket_fd);
     81       socket_fd = -1;
     82       CDBG_ERROR("%s: socket_fd=%d %s ", __func__, socket_fd, strerror(errno));
     83     }
     84 
     85     CDBG("%s: socket_fd=%d %s", __func__, socket_fd, sock_addr.sun_path);
     86     return socket_fd;
     87 }
     88 
     89 /*===========================================================================
     90  * FUNCTION    - mm_camera_socket_close -
     91  *
     92  * DESCRIPTION:  close domain socket by its fd
     93  *==========================================================================*/
     94 void mm_camera_socket_close(int fd)
     95 {
     96     if (fd > 0) {
     97       close(fd);
     98     }
     99 }
    100 
    101 /*===========================================================================
    102  * FUNCTION    - mm_camera_socket_sendmsg -
    103  *
    104  * DESCRIPTION:  send msg through domain socket
    105  *                         int fd: socket fd
    106  *                         mm_camera_sock_msg_packet_t *msg: pointer to msg to be sent over domain socket
    107  *                         int sendfd: file descriptors to be sent
    108  * return the total bytes of sent msg
    109  *==========================================================================*/
    110 int mm_camera_socket_sendmsg(
    111   int fd,
    112   void *msg,
    113   uint32_t buf_size,
    114   int sendfd)
    115 {
    116     struct msghdr msgh;
    117     struct iovec iov[1];
    118     struct cmsghdr * cmsghp = NULL;
    119     char control[CMSG_SPACE(sizeof(int))];
    120 
    121     if (msg == NULL) {
    122       CDBG("%s: msg is NULL", __func__);
    123       return -1;
    124     }
    125     memset(&msgh, 0, sizeof(msgh));
    126     msgh.msg_name = NULL;
    127     msgh.msg_namelen = 0;
    128 
    129     iov[0].iov_base = msg;
    130     iov[0].iov_len = buf_size;
    131     msgh.msg_iov = iov;
    132     msgh.msg_iovlen = 1;
    133     CDBG("%s: iov_len=%d", __func__, iov[0].iov_len);
    134 
    135     msgh.msg_control = NULL;
    136     msgh.msg_controllen = 0;
    137 
    138     // if sendfd is vlaid, we need to pass it through control msg
    139     if( sendfd > 0) {
    140       msgh.msg_control = control;
    141       msgh.msg_controllen = sizeof(control);
    142       cmsghp = CMSG_FIRSTHDR(&msgh);
    143       if (cmsghp != NULL) {
    144         CDBG("%s: Got ctrl msg pointer", __func__);
    145         cmsghp->cmsg_level = SOL_SOCKET;
    146         cmsghp->cmsg_type = SCM_RIGHTS;
    147         cmsghp->cmsg_len = CMSG_LEN(sizeof(int));
    148         *((int *)CMSG_DATA(cmsghp)) = sendfd;
    149         CDBG("%s: cmsg data=%d", __func__, *((int *) CMSG_DATA(cmsghp)));
    150       } else {
    151         CDBG("%s: ctrl msg NULL", __func__);
    152         return -1;
    153       }
    154     }
    155 
    156     return sendmsg(fd, &(msgh), 0);
    157 }
    158 
    159 /*===========================================================================
    160  * FUNCTION    - mm_camera_socket_recvmsg -
    161  *
    162  * DESCRIPTION:  receive msg from domain socket.
    163  *                         int fd: socket fd
    164  *                         void *msg: pointer to mm_camera_sock_msg_packet_t to hold incoming msg,
    165  *                                    need be allocated by the caller
    166  *                         uint32_t buf_size: the size of the buf that holds incoming msg
    167  *                         int *rcvdfd: pointer to hold recvd file descriptor if not NULL.
    168  * return the total bytes of received msg
    169  *==========================================================================*/
    170 int mm_camera_socket_recvmsg(
    171   int fd,
    172   void *msg,
    173   uint32_t buf_size,
    174   int *rcvdfd)
    175 {
    176     struct msghdr msgh;
    177     struct iovec iov[1];
    178     struct cmsghdr *cmsghp = NULL;
    179     char control[CMSG_SPACE(sizeof(int))];
    180     int rcvd_fd = -1;
    181     int rcvd_len = 0;
    182 
    183     if ( (msg == NULL) || (buf_size <= 0) ) {
    184       CDBG_ERROR(" %s: msg buf is NULL", __func__);
    185       return -1;
    186     }
    187 
    188     memset(&msgh, 0, sizeof(msgh));
    189     msgh.msg_name = NULL;
    190     msgh.msg_namelen = 0;
    191     msgh.msg_control = control;
    192     msgh.msg_controllen = sizeof(control);
    193 
    194     iov[0].iov_base = msg;
    195     iov[0].iov_len = buf_size;
    196     msgh.msg_iov = iov;
    197     msgh.msg_iovlen = 1;
    198 
    199     if ( (rcvd_len = recvmsg(fd, &(msgh), 0)) <= 0) {
    200       CDBG_ERROR(" %s: recvmsg failed", __func__);
    201       return rcvd_len;
    202     }
    203 
    204     CDBG("%s:  msg_ctrl %p len %d", __func__, msgh.msg_control, msgh.msg_controllen);
    205 
    206     if( ((cmsghp = CMSG_FIRSTHDR(&msgh)) != NULL) &&
    207 		    (cmsghp->cmsg_len == CMSG_LEN(sizeof(int))) ) {
    208       if (cmsghp->cmsg_level == SOL_SOCKET &&
    209         cmsghp->cmsg_type == SCM_RIGHTS) {
    210         CDBG("%s:  CtrlMsg is valid", __func__);
    211         rcvd_fd = *((int *) CMSG_DATA(cmsghp));
    212         CDBG("%s:  Receieved fd=%d", __func__, rcvd_fd);
    213       } else {
    214         CDBG_ERROR("%s:  Unexpected Control Msg. Line=%d", __func__, __LINE__);
    215       }
    216     }
    217 
    218     if (rcvdfd) {
    219       *rcvdfd = rcvd_fd;
    220     }
    221 
    222     return rcvd_len;
    223 }
    224 
    225