none/tests/fdleak_cmsg.c

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   9 #include <sys/socket.h>
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  21 #include <string.h>
  22 #include <sys/types.h>
  23 #include <sys/wait.h>
  24 #include <sys/un.h>
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include "fdleak.h"
  31
  32 char filea[24];
  33 char fileb[24];
  34 char sock[24];
  35
  36 void server (void)
  37 {
  38    int s, fd1, fd2;
  39    struct sockaddr_un addr;
  40
  41    fd1 = DO( open(filea, O_RDWR | O_CREAT | O_TRUNC, 0750) );
  42    fd2 = DO( open(fileb, O_RDWR | O_CREAT | O_TRUNC, 0750) );
  43    s   = DO( socket(PF_UNIX, SOCK_STREAM, 0) );
  44
  45    memset(&addr, 0, sizeof(addr));
  46    addr.sun_family = AF_UNIX;
  47    sprintf(addr.sun_path, "%s", sock);
  48
  49    unlink(sock);
  50    (void) DO( bind(s, (struct sockaddr *)&addr, sizeof(addr)) );
  51    (void) DO( listen(s, 5) );
  52
  53    {
  54       int x;
  55       unsigned baddrsize = 0;
  56       struct sockaddr_un baddr;
  57       struct msghdr msg = {NULL, 0, NULL, 0, 0, 0, 0};
  58       struct cmsghdr *cmsg;
  59       char buf[CMSG_SPACE(sizeof(int) * 2)];
  60       struct iovec iov[1];
  61
  62       memset(&baddr, 0, sizeof(baddr));
  63       x = DO( accept(s, (struct sockaddr *)&baddr, &baddrsize) );
  64
  65       msg.msg_control = buf;
  66       msg.msg_controllen = sizeof(buf);
  67       cmsg = CMSG_FIRSTHDR(&msg);
  68       cmsg->cmsg_level = SOL_SOCKET;
  69       cmsg->cmsg_type = SCM_RIGHTS;
  70       cmsg->cmsg_len = CMSG_LEN(sizeof(int) * 2);
  71       ((int *)CMSG_DATA(cmsg))[0] = fd1;
  72       ((int *)CMSG_DATA(cmsg))[1] = fd2;
  73
  74       iov[0].iov_base = "hello";
  75       iov[0].iov_len = 6;
  76
  77       msg.msg_iov = iov;
  78       msg.msg_iovlen = 1;
  79
  80       (void) DO( sendmsg(x, &msg, 0) );
  81    }
  82 }
  83
  84 void client (void)
  85 {
  86    int s, fd1 = -1, fd2 = -1, size, count = 0, ret;
  87    struct sockaddr_un addr;
  88    struct iovec iov[1];
  89    union {
  90       struct cmsghdr cm;
  91       char control[CMSG_SPACE(sizeof(int) * 2)];
  92    } control_un;
  93    struct msghdr msg = { NULL, 0, iov, 1, control_un.control,
  94                          sizeof(control_un), 0 };
  95    struct cmsghdr *cmsg = &control_un.cm;
  96    char buf[1024];
  97
  98    iov[0].iov_base = buf;
  99    iov[0].iov_len = sizeof(buf);
 100
 101    s = socket(PF_UNIX, SOCK_STREAM, 0);
 102    if (s == -1) {
 103       perror("socket");
 104       exit(1);
 105    }
 106
 107    addr.sun_family = AF_UNIX;
 108    sprintf(addr.sun_path, "%s", sock);
 109
 110    do {
 111      count++;
 112      ret = connect(s, (struct sockaddr *)&addr, sizeof(addr));
 113      if (ret == -1) sleep(1);
 114    } while (count < 10 && ret == -1);
 115
 116    if (ret == -1) {
 117       perror("connect");
 118       exit(1);
 119    }
 120
 121   again:
 122    if ((size = recvmsg(s, &msg, 0)) == -1) {
 123       if (errno == EINTR)
 124          goto again;            /* SIGCHLD from server exiting could interrupt */
 125       perror("recvmsg");
 126       exit(1);
 127    }
 128
 129
 130    cmsg = CMSG_FIRSTHDR(&msg);
 131    while (cmsg) {
 132       if (cmsg->cmsg_level == SOL_SOCKET &&
 133          cmsg->cmsg_type == SCM_RIGHTS &&
 134          cmsg->cmsg_len == CMSG_LEN(sizeof(int) * 2)) {
 135          fd1 = ((int *)CMSG_DATA(cmsg))[0];
 136          fd2 = ((int *)CMSG_DATA(cmsg))[1];
 137       }
 138
 139       cmsg = CMSG_NXTHDR(&msg, cmsg);
 140    }
 141
 142    if (fd1 != -1) write(fd1, "Yeah 1\n", 8);
 143    if (fd2 != -1) write(fd2, "Yeah 2\n", 8);
 144 }
 145
 146
 147 int main (int argc, char **argv)
 148 {
 149    int pid, status;
 150
 151    CLOSE_INHERITED_FDS;
 152
 153    pid = getpid();
 154    sprintf(filea, "/tmp/data1.%d", pid);
 155    sprintf(fileb, "/tmp/data2.%d", pid);
 156    sprintf(sock, "/tmp/sock.%d", pid);
 157
 158    if ((pid = fork()) == 0) {
 159       server();
 160       return 0;
 161    }
 162
 163    client();
 164
 165    wait(&status);
 166
 167    (void) DO( unlink(filea) );
 168    (void) DO( unlink(fileb) );
 169    (void) DO( unlink(sock) );
 170    return 0;
 171 }