2e89653e65
UDS expects the device number of the actual socket, not the device on which the socket happens to reside. The code worked only because PFS returned the same value in the st_dev stat field, which it will have to continue doing for a while now. Change-Id: I426d38a86a96307ff6e6ed8099d37dae02d6bf2b
140 lines
2.5 KiB
C
140 lines
2.5 KiB
C
#include <sys/cdefs.h>
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#include "namespace.h"
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <net/netlib.h>
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#include <sys/ioc_net.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#define DEBUG 0
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static int _uds_socketpair(int type, int protocol, int sv[2]);
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/*
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* Create a pair of connected sockets
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*/
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int socketpair(int domain, int type, int protocol, int sv[2]) {
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#if DEBUG
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fprintf(stderr, "socketpair: domain %d, type %d, protocol %d\n",
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domain, type, protocol);
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#endif
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if (domain != AF_UNIX)
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{
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errno = EAFNOSUPPORT;
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return -1;
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}
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if (domain == AF_UNIX &&
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(type == SOCK_STREAM || type == SOCK_SEQPACKET))
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return _uds_socketpair(type, protocol, sv);
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#if DEBUG
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fprintf(stderr,
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"socketpair: nothing for domain %d, type %d, protocol %d\n",
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domain, type, protocol);
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#endif
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errno= EPROTOTYPE;
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return -1;
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}
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static int _uds_socketpair(int type, int protocol, int sv[2])
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{
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dev_t dev;
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int r, i;
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struct stat sbuf;
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if (protocol != 0)
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{
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#if DEBUG
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fprintf(stderr, "socketpair(uds): bad protocol %d\n", protocol);
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#endif
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errno= EPROTONOSUPPORT;
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return -1;
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}
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/* in this 'for' loop two unconnected sockets are created */
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for (i = 0; i < 2; i++) {
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sv[i]= open(UDS_DEVICE, O_RDWR);
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if (sv[i] == -1) {
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int open_errno = errno;
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if (i == 1) {
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/* if we failed to open() the 2nd
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* socket, we need to close the 1st
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*/
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close(sv[0]);
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errno = open_errno;
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}
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return -1;
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}
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/* set the type for the socket via ioctl
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* (SOCK_STREAM, SOCK_SEQPACKET, etc)
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*/
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r= ioctl(sv[i], NWIOSUDSTYPE, &type);
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if (r == -1) {
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int ioctl_errno;
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/* if that failed rollback socket creation */
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ioctl_errno= errno;
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close(sv[i]);
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if (i == 1) {
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/* if we just closed the 2nd socket, we
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* need to close the 1st
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*/
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close(sv[0]);
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}
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/* return the error thrown by the call to ioctl */
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errno= ioctl_errno;
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return -1;
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}
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}
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r= fstat(sv[1], &sbuf);
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if (r == -1) {
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int fstat_errno;
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/* if that failed rollback socket creation */
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fstat_errno= errno;
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close(sv[0]);
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close(sv[1]);
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/* return the error thrown by the call to fstat */
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errno= fstat_errno;
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return -1;
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}
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dev = sbuf.st_rdev;
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/* connect the sockets sv[0] and sv[1] */
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r= ioctl(sv[0], NWIOSUDSPAIR, &dev);
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if (r == -1) {
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int ioctl_errno;
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/* if that failed rollback socket creation */
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ioctl_errno= errno;
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close(sv[0]);
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close(sv[1]);
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/* return the error thrown by the call to ioctl */
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errno= ioctl_errno;
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return -1;
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}
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return 0;
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}
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