get_myaddress.c 3.0 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. #define __FORCE_GLIBC__
  31. #include <features.h>
  32. /*
  33. * get_myaddress.c
  34. *
  35. * Get client's IP address via ioctl. This avoids using the yellowpages.
  36. * Copyright (C) 1984, Sun Microsystems, Inc.
  37. */
  38. #include <rpc/types.h>
  39. #include <rpc/pmap_prot.h>
  40. #include <sys/socket.h>
  41. #include <stdio.h>
  42. //#include <net/if.h>
  43. #include <sys/ioctl.h>
  44. #include <arpa/inet.h>
  45. #include <netinet/in.h>
  46. #include <rpc/clnt.h>
  47. #include <unistd.h>
  48. #ifdef __linux__
  49. /* DO use gethostbyname because it's portable */
  50. #include <netdb.h>
  51. void get_myaddress(addr)
  52. struct sockaddr_in *addr;
  53. {
  54. char localhost[256 + 1];
  55. struct hostent *hp;
  56. gethostname(localhost, 256);
  57. if ((hp = gethostbyname(localhost)) == NULL) {
  58. perror("get_myaddress: gethostbyname");
  59. exit(1);
  60. }
  61. addr->sin_family = AF_INET;
  62. bcopy((char *) hp->h_addr, (char *) &addr->sin_addr, hp->h_length);
  63. addr->sin_port = htons(PMAPPORT);
  64. }
  65. #else
  66. /*
  67. * don't use gethostbyname, which would invoke yellow pages
  68. */
  69. void get_myaddress(addr)
  70. struct sockaddr_in *addr;
  71. {
  72. int s;
  73. char buf[BUFSIZ];
  74. struct ifconf ifc;
  75. struct ifreq ifreq, *ifr;
  76. int len;
  77. if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  78. perror("get_myaddress: socket");
  79. exit(1);
  80. }
  81. ifc.ifc_len = sizeof(buf);
  82. ifc.ifc_buf = buf;
  83. if (ioctl(s, SIOCGIFCONF, (char *) &ifc) < 0) {
  84. perror("get_myaddress: ioctl (get interface configuration)");
  85. exit(1);
  86. }
  87. ifr = ifc.ifc_req;
  88. for (len = ifc.ifc_len; len; len -= sizeof ifreq) {
  89. ifreq = *ifr;
  90. if (ioctl(s, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
  91. perror("get_myaddress: ioctl");
  92. exit(1);
  93. }
  94. if ((ifreq.ifr_flags & IFF_UP) &&
  95. ifr->ifr_addr.sa_family == AF_INET) {
  96. *addr = *((struct sockaddr_in *) &ifr->ifr_addr);
  97. addr->sin_port = htons(PMAPPORT);
  98. break;
  99. }
  100. ifr++;
  101. }
  102. (void) close(s);
  103. }
  104. #endif