get_myaddress.c 3.1 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 !defined(lint) && defined(SCCSIDS)
  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/pmap_prot.h>
  41. #include <sys/socket.h>
  42. #include <stdio.h>
  43. //#include <net/if.h>
  44. #include <sys/ioctl.h>
  45. #include <arpa/inet.h>
  46. #include <netinet/in.h>
  47. #ifdef __linux__
  48. /* DO use gethostbyname because it's portable */
  49. #include <netdb.h>
  50. get_myaddress(addr)
  51. struct sockaddr_in *addr;
  52. {
  53. char localhost[256 + 1];
  54. struct hostent *hp;
  55. gethostname(localhost, 256);
  56. if ((hp = gethostbyname(localhost)) == NULL) {
  57. perror("get_myaddress: gethostbyname");
  58. exit(1);
  59. }
  60. addr->sin_family = AF_INET;
  61. bcopy((char *) hp->h_addr, (char *) &addr->sin_addr, hp->h_length);
  62. addr->sin_port = htons(PMAPPORT);
  63. }
  64. #else
  65. /*
  66. * don't use gethostbyname, which would invoke yellow pages
  67. */
  68. get_myaddress(addr)
  69. struct sockaddr_in *addr;
  70. {
  71. int s;
  72. char buf[BUFSIZ];
  73. struct ifconf ifc;
  74. struct ifreq ifreq, *ifr;
  75. int len;
  76. if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  77. perror("get_myaddress: socket");
  78. exit(1);
  79. }
  80. ifc.ifc_len = sizeof (buf);
  81. ifc.ifc_buf = buf;
  82. if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
  83. perror("get_myaddress: ioctl (get interface configuration)");
  84. exit(1);
  85. }
  86. ifr = ifc.ifc_req;
  87. for (len = ifc.ifc_len; len; len -= sizeof ifreq) {
  88. ifreq = *ifr;
  89. if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
  90. perror("get_myaddress: ioctl");
  91. exit(1);
  92. }
  93. if ((ifreq.ifr_flags & IFF_UP) &&
  94. ifr->ifr_addr.sa_family == AF_INET) {
  95. *addr = *((struct sockaddr_in *)&ifr->ifr_addr);
  96. addr->sin_port = htons(PMAPPORT);
  97. break;
  98. }
  99. ifr++;
  100. }
  101. (void) close(s);
  102. }
  103. #endif