usr/src/cmd/smbsrv/fksmbd/fksmbd_ksock.c

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  14  */
  15
  16 /*
  17  * fork/exec a privileged helper to do the bind.
  18  */
  19
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <sys/socket.h>
  27 #include <sys/note.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30
  31 int
  32 ksocket_bind_helper(int fd, struct sockaddr *addr, uint_t addrlen)
  33 {
  34         char familystr[8];
  35         char portstr[12];
  36         char addrstr[INET6_ADDRSTRLEN];
  37         char *argv[6];
  38         const char *p;
  39         /* LINTED E_BAD_PTR_CAST_ALIGN */
  40         struct sockaddr_in  *sin  = (struct sockaddr_in *)addr;
  41         /* LINTED E_BAD_PTR_CAST_ALIGN */
  42         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
  43         int pid, err, stat;
  44         _NOTE(ARGUNUSED(addrlen));
  45
  46         (void) snprintf(familystr, sizeof (familystr), "%d", addr->sa_family);
  47         switch (addr->sa_family) {
  48         case AF_INET:
  49                 (void) snprintf(portstr, sizeof (portstr), "%d",
  50                     ntohs(sin->sin_port));
  51                 p = inet_ntop(AF_INET, &sin->sin_addr,
  52                     addrstr, sizeof (addrstr));
  53                 break;
  54         case AF_INET6:
  55                 (void) snprintf(portstr, sizeof (portstr), "%d",
  56                     ntohs(sin6->sin6_port));
  57                 p = inet_ntop(AF_INET6, &sin6->sin6_addr,
  58                     addrstr, sizeof (addrstr));
  59                 break;
  60         default:
  61                 p = NULL;
  62                 break;
  63         }
  64         if (p == NULL) {
  65                 err = errno;
  66                 (void) fprintf(stdout, "ksocket_bind_helper, inet_ntop %s\n",
  67                     strerror(err));
  68                 return (err);
  69         }
  70
  71         (void) fprintf(stdout, "ksocket_bind_helper, "
  72             "family=%s addr=%s port=%s\n",
  73             familystr, addrstr, portstr);
  74
  75         argv[0] = "/usr/bin/pfexec";
  76         argv[1] = "/usr/lib/smbsrv/bind-helper";
  77         argv[2] = familystr;
  78         argv[3] = addrstr;
  79         argv[4] = portstr;
  80         argv[5] = NULL;
  81
  82         pid = vfork();
  83         if (pid == -1) {
  84                 err = errno;
  85                 perror("fork");
  86                 return (err);
  87         }
  88         if (pid == 0) {
  89                 (void) dup2(fd, 0);
  90                 (void) execv(argv[0], argv);
  91                 err = errno;
  92                 perror("execv");
  93                 return (err);
  94         }
  95         err = waitpid(pid, &stat, 0);
  96         if (err == -1) {
  97                 err = errno;
  98                 perror("waitpid");
  99                 return (err);
 100         }
 101         if (WIFEXITED(stat)) {
 102                 err = WEXITSTATUS(stat);
 103                 if (err == 0)
 104                         return (0);
 105                 (void) fprintf(stderr, "helper exit %d\n", err);
 106         }
 107         return (EACCES);
 108 }