addr.c 4.8 KB

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  1. /* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
  2. * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
  3. *
  4. * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  5. */
  6. /*
  7. * Manuel Novoa III Dec 2000
  8. *
  9. * Converted to use my new (un)signed long (long) to string routines, which
  10. * are smaller than the previous functions and don't require static buffers.
  11. * In the process, removed the reference to strcat and cut object size of
  12. * inet_ntoa in half (from 190 bytes down to 94).
  13. *
  14. * Manuel Novoa III Feb 2002
  15. *
  16. * Changed to use _int10tostr.
  17. */
  18. #define __FORCE_GLIBC
  19. #include <features.h>
  20. #include <stdio.h>
  21. #include <string.h>
  22. #include <ctype.h>
  23. #include <netinet/in.h>
  24. #include <arpa/inet.h>
  25. #include <bits/uClibc_uintmaxtostr.h>
  26. #ifdef L_inet_aton
  27. /*
  28. * More undocumented inet_aton features.
  29. * (read: uclibc doesnt support but glibc does)
  30. * http://www.mkssoftware.com/docs/man3/inet_aton.3.asp
  31. *
  32. * *cp can take the form of:
  33. * a.b.c.d - {a,b,c,d} -> 1 byte
  34. * a.b.c - {a,b} -> 1 byte {c} -> 2 bytes
  35. * a.b - {a} -> 1 byte {b} -> 3 bytes
  36. * a - {a} -> 4 bytes
  37. *
  38. * Each part may be decimal, octal, or hexadecimal as in ISO C.
  39. * 0x or 0X -> hexadecimal
  40. * leading 0 -> octal
  41. * all else -> decimal
  42. */
  43. #ifdef __UCLIBC_HAS_XLOCALE__
  44. libc_hidden_proto(__ctype_b_loc)
  45. #elif defined __UCLIBC_HAS_CTYPE_TABLES__
  46. libc_hidden_proto(__ctype_b)
  47. #endif
  48. libc_hidden_proto(inet_aton)
  49. int inet_aton(const char *cp, struct in_addr *addrptr)
  50. {
  51. in_addr_t addr;
  52. int value;
  53. int part;
  54. if (cp == NULL) {
  55. return 0;
  56. }
  57. addr = 0;
  58. for (part = 1; part <= 4; part++) {
  59. if (!isdigit(*cp))
  60. return 0;
  61. value = 0;
  62. while (isdigit(*cp)) {
  63. value *= 10;
  64. value += *cp++ - '0';
  65. if (value > 255)
  66. return 0;
  67. }
  68. if (part < 4) {
  69. if (*cp++ != '.')
  70. return 0;
  71. } else {
  72. char c = *cp++;
  73. if (c != '\0' && !isspace(c))
  74. return 0;
  75. }
  76. addr <<= 8;
  77. addr |= value;
  78. }
  79. /* W. Richard Stevens in his book UNIX Network Programming,
  80. * Volume 1, second edition, on page 71 says:
  81. *
  82. * An undocumented feature of inet_aton is that if addrptr is
  83. * a null pointer, the function still performs it validation
  84. * of the input string, but does not store the result.
  85. */
  86. if (addrptr) {
  87. addrptr->s_addr = htonl(addr);
  88. }
  89. return 1;
  90. }
  91. libc_hidden_def(inet_aton)
  92. #endif
  93. #ifdef L_inet_addr
  94. libc_hidden_proto(inet_aton)
  95. libc_hidden_proto(inet_addr)
  96. in_addr_t inet_addr(const char *cp)
  97. {
  98. struct in_addr a;
  99. if (!inet_aton(cp, &a))
  100. return INADDR_NONE;
  101. else
  102. return a.s_addr;
  103. }
  104. libc_hidden_def(inet_addr)
  105. #endif
  106. #ifdef L_inet_ntoa
  107. #define INET_NTOA_MAX_LEN 16 /* max 12 digits + 3 '.'s + 1 nul */
  108. libc_hidden_proto(inet_ntoa_r)
  109. char *inet_ntoa_r(struct in_addr in, char buf[INET_NTOA_MAX_LEN])
  110. {
  111. in_addr_t addr = ntohl(in.s_addr);
  112. int i;
  113. char *p, *q;
  114. q = 0;
  115. p = buf + INET_NTOA_MAX_LEN - 1; /* cannot use sizeof(buf) here */
  116. for (i = 0; i < 4; i++ ) {
  117. p = _int10tostr(p, addr & 0xff) - 1;
  118. addr >>= 8;
  119. if (q) {
  120. *q = '.';
  121. }
  122. q = p;
  123. }
  124. return p+1;
  125. }
  126. libc_hidden_def(inet_ntoa_r)
  127. libc_hidden_proto(inet_ntoa)
  128. char *inet_ntoa(struct in_addr in)
  129. {
  130. static char buf[INET_NTOA_MAX_LEN];
  131. return inet_ntoa_r(in, buf);
  132. }
  133. libc_hidden_def(inet_ntoa)
  134. #endif
  135. #ifdef L_inet_makeaddr
  136. /* for some reason it does not remove the jump relocation */
  137. /* Experimentally off - libc_hidden_proto(memmove) */
  138. /*
  139. * Formulate an Internet address from network + host. Used in
  140. * building addresses stored in the ifnet structure.
  141. */
  142. libc_hidden_proto(inet_makeaddr)
  143. struct in_addr inet_makeaddr(in_addr_t net, in_addr_t host)
  144. {
  145. in_addr_t addr;
  146. if (net < 128)
  147. addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
  148. else if (net < 65536)
  149. addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
  150. else if (net < 16777216UL)
  151. addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
  152. else
  153. addr = net | host;
  154. addr = htonl(addr);
  155. return *(struct in_addr *)&addr;
  156. }
  157. libc_hidden_def(inet_makeaddr)
  158. #endif
  159. #ifdef L_inet_lnaof
  160. /*
  161. * Return the local network address portion of an
  162. * internet address; handles class a/b/c network
  163. * number formats.
  164. */
  165. in_addr_t inet_lnaof(struct in_addr in)
  166. {
  167. in_addr_t i = ntohl(in.s_addr);
  168. if (IN_CLASSA(i))
  169. return (i & IN_CLASSA_HOST);
  170. else if (IN_CLASSB(i))
  171. return (i & IN_CLASSB_HOST);
  172. else
  173. return (i & IN_CLASSC_HOST);
  174. }
  175. #endif
  176. #ifdef L_inet_netof
  177. /*
  178. * Return the network number from an internet
  179. * address; handles class a/b/c network #'s.
  180. */
  181. libc_hidden_proto(inet_netof)
  182. in_addr_t
  183. inet_netof(struct in_addr in)
  184. {
  185. in_addr_t i = ntohl(in.s_addr);
  186. if (IN_CLASSA(i))
  187. return ((i & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
  188. else if (IN_CLASSB(i))
  189. return ((i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
  190. else
  191. return ((i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
  192. }
  193. libc_hidden_def(inet_netof)
  194. #endif