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ud_socket.c

/*
 * $Id: ud_socket.c,v 1.6 2009/04/22 18:22:28 thockin Exp $
 * A few  routines for handling UNIX domain sockets
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>

#include "acpid.h"
#include "ud_socket.h"

int
ud_create_socket(const char *name)
{
      int fd;
      int r;
      struct sockaddr_un uds_addr;

      /* JIC */
      unlink(name);

      fd = socket(AF_UNIX, SOCK_STREAM, 0);
      if (fd < 0) {
            return fd;
      }

      /* setup address struct */
      memset(&uds_addr, 0, sizeof(uds_addr));
      uds_addr.sun_family = AF_UNIX;
      strcpy(uds_addr.sun_path, name);
      
      /* bind it to the socket */
      r = bind(fd, (struct sockaddr *)&uds_addr, sizeof(uds_addr));
      if (r < 0) {
            return r;
      }

      /* listen - allow 10 to queue */
      r = listen(fd, 10);
      if (r < 0) {
            return r;
      }

      return fd;
}

int
ud_accept(int listenfd, struct ucred *cred)
{
      while (1) {
            int newsock = 0;
            struct sockaddr_un cliaddr;
            socklen_t len = sizeof(struct sockaddr_un);

            newsock = accept(listenfd, (struct sockaddr *)&cliaddr, &len);
            if (newsock < 0) {
                  if (errno == EINTR) {
                        continue; /* signal */
                  }
            
                  return newsock;
            }

            if (cred) {
                  len = sizeof(struct ucred);
                  getsockopt(newsock,SOL_SOCKET,SO_PEERCRED,cred,&len);
            }

            return newsock;
      }
}

int
ud_connect(const char *name)
{
      int fd;
      int r;
      struct sockaddr_un addr;

      fd = socket(AF_UNIX, SOCK_STREAM, 0);
      if (fd < 0) {
            return fd;
      }

      memset(&addr, 0, sizeof(addr));
      addr.sun_family = AF_UNIX;
      sprintf(addr.sun_path, "%s", name);

      r = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
      if (r < 0) {
            close(fd);
            return r;
      }

      return fd;
}

int
ud_get_peercred(int fd, struct ucred *cred)
{
      socklen_t len = sizeof(struct ucred);
      getsockopt(fd, SOL_SOCKET, SO_PEERCRED, cred, &len);
      return 0;
}

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