get_myaddress.c 3.2 KB

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  1. /* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */
  2. /*
  3. * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  4. * unrestricted use provided that this legend is included on all tape
  5. * media and as a part of the software program in whole or part. Users
  6. * may copy or modify Sun RPC without charge, but are not authorized
  7. * to license or distribute it to anyone else except as part of a product or
  8. * program developed by the user.
  9. *
  10. * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11. * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12. * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13. *
  14. * Sun RPC is provided with no support and without any obligation on the
  15. * part of Sun Microsystems, Inc. to assist in its use, correction,
  16. * modification or enhancement.
  17. *
  18. * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19. * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20. * OR ANY PART THEREOF.
  21. *
  22. * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23. * or profits or other special, indirect and consequential damages, even if
  24. * Sun has been advised of the possibility of such damages.
  25. *
  26. * Sun Microsystems, Inc.
  27. * 2550 Garcia Avenue
  28. * Mountain View, California 94043
  29. */
  30. #if 0
  31. static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
  32. #endif
  33. /*
  34. * get_myaddress.c
  35. *
  36. * Get client's IP address via ioctl. This avoids using the yellowpages.
  37. * Copyright (C) 1984, Sun Microsystems, Inc.
  38. */
  39. #include <rpc/types.h>
  40. #include <rpc/clnt.h>
  41. #include <rpc/pmap_prot.h>
  42. #include <sys/socket.h>
  43. #include <stdio.h>
  44. #include <unistd.h>
  45. #include <net/if.h>
  46. #include <sys/ioctl.h>
  47. /* Order of following two #includes reversed by roland@gnu */
  48. #include <netinet/in.h>
  49. #include <arpa/inet.h>
  50. libc_hidden_proto(ioctl)
  51. libc_hidden_proto(socket)
  52. libc_hidden_proto(close)
  53. libc_hidden_proto(perror)
  54. libc_hidden_proto(exit)
  55. /*
  56. * don't use gethostbyname, which would invoke yellow pages
  57. *
  58. * Avoid loopback interfaces. We return information from a loopback
  59. * interface only if there are no other possible interfaces.
  60. */
  61. void
  62. get_myaddress (struct sockaddr_in *addr)
  63. {
  64. int s;
  65. char buf[BUFSIZ];
  66. struct ifconf ifc;
  67. struct ifreq ifreq, *ifr;
  68. int len, loopback = 0;
  69. if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
  70. {
  71. perror ("get_myaddress: socket");
  72. exit (1);
  73. }
  74. ifc.ifc_len = sizeof (buf);
  75. ifc.ifc_buf = buf;
  76. if (ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)
  77. {
  78. perror (_("get_myaddress: ioctl (get interface configuration)"));
  79. exit (1);
  80. }
  81. again:
  82. ifr = ifc.ifc_req;
  83. for (len = ifc.ifc_len; len; len -= sizeof ifreq)
  84. {
  85. ifreq = *ifr;
  86. if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
  87. {
  88. perror ("get_myaddress: ioctl");
  89. exit (1);
  90. }
  91. if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)
  92. && (!(ifreq.ifr_flags & IFF_LOOPBACK) ||
  93. (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))))
  94. {
  95. *addr = *((struct sockaddr_in *) &ifr->ifr_addr);
  96. addr->sin_port = htons (PMAPPORT);
  97. close (s);
  98. return;
  99. }
  100. ifr++;
  101. }
  102. if (loopback == 0)
  103. {
  104. loopback = 1;
  105. goto again;
  106. }
  107. close (s);
  108. }