external/ibm-public/postfix/dist/src/global/valid_mailhost_addr.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      valid_mailhost_addr 3
   6 /* SUMMARY
   7 /*      mailhost address syntax validation
   8 /* SYNOPSIS
   9 /*      #include <valid_mailhost_addr.h>
  10 /*
  11 /*      const char *valid_mailhost_addr(name, gripe)
  12 /*      const char *name;
  13 /*      int     gripe;
  14 /*
  15 /*      int     valid_mailhost_literal(addr, gripe)
  16 /*      const char *addr;
  17 /*      int     gripe;
  18 /* DESCRIPTION
  19 /*      valid_mailhost_addr() requires that the input is a valid
  20 /*      RFC 2821 string representation of an IPv4 or IPv6 network
  21 /*      address.  A valid IPv4 address is in dotted quad decimal
  22 /*      form.  A valid IPv6 address includes the "IPV6:" prefix as
  23 /*      required by RFC 2821, and is in valid hexadecimal form or
  24 /*      in valid IPv4-in-IPv6 form.  The result value is the bare
  25 /*      address in the input argument (i.e. text after "IPV6:"
  26 /*      prefix, if any) in case of success, a null pointer in case
  27 /*      of failure.
  28 /*
  29 /*      valid_mailhost_literal() requires an address enclosed in
  30 /*      [].  The result is non-zero in case of success, zero in
  31 /*      case of failure.
  32 /*
  33 /*      These routines operate silently unless the gripe parameter
  34 /*      specifies a non-zero value. The macros DO_GRIPE and DONT_GRIPE
  35 /*      provide suitable constants.
  36 /*
  37 /*      The IPV6_COL macro defines the "IPv6:" prefix.
  38 /* DIAGNOSTICS
  39 /*      Warnings are logged with msg_warn().
  40 /* SEE ALSO
  41 /*      valid_hostname(3)
  42 /*      RFC 952, RFC 1123, RFC 1035, RFC 2821
  43 /* LICENSE
  44 /* .ad
  45 /* .fi
  46 /*      The Secure Mailer license must be distributed with this software.
  47 /* AUTHOR(S)
  48 /*      Wietse Venema
  49 /*      IBM T.J. Watson Research
  50 /*      P.O. Box 704
  51 /*      Yorktown Heights, NY 10598, USA
  52 /*--*/
  53
  54
  55 /* System library. */
  56
  57 #include <sys_defs.h>
  58 #include <string.h>
  59
  60 #ifdef STRCASECMP_IN_STRINGS_H
  61 #include <strings.h>
  62 #endif
  63
  64 /* Utility library. */
  65
  66 #include <msg.h>
  67 #include <myaddrinfo.h>
  68
  69 /* Global library. */
  70
  71 #include <valid_mailhost_addr.h>
  72
  73 /* Application-specific. */
  74
  75 #define IPV6_COL_LEN       (sizeof(IPV6_COL) - 1)
  76 #define HAS_IPV6_COL(str)  (strncasecmp((str), IPV6_COL, IPV6_COL_LEN) == 0)
  77 #define SKIP_IPV6_COL(str) (HAS_IPV6_COL(str) ? (str) + IPV6_COL_LEN : (str))
  78
  79 /* valid_mailhost_addr - validate RFC 2821 numerical address form */
  80
  81 const char *valid_mailhost_addr(const char *addr, int gripe)
  82 {
  83     const char *bare_addr;
  84
  85     bare_addr = SKIP_IPV6_COL(addr);
  86     return ((bare_addr != addr ? valid_ipv6_hostaddr : valid_ipv4_hostaddr)
  87             (bare_addr, gripe) ? bare_addr : 0);
  88 }
  89
  90 /* valid_mailhost_literal - validate [RFC 2821 numerical address] form */
  91
  92 int     valid_mailhost_literal(const char *addr, int gripe)
  93 {
  94     const char *myname = "valid_mailhost_literal";
  95     MAI_HOSTADDR_STR hostaddr;
  96     const char *last;
  97     size_t address_bytes;
  98
  99     if (*addr != '[') {
 100         if (gripe)
 101             msg_warn("%s: '[' expected at start: %.100s", myname, addr);
 102         return (0);
 103     }
 104     if ((last = strchr(addr, ']')) == 0) {
 105         if (gripe)
 106             msg_warn("%s: ']' expected at end: %.100s", myname, addr);
 107         return (0);
 108     }
 109     if (last[1]) {
 110         if (gripe)
 111             msg_warn("%s: unexpected text after ']': %.100s", myname, addr);
 112         return (0);
 113     }
 114     if ((address_bytes = last - addr - 1) >= sizeof(hostaddr.buf)) {
 115         if (gripe)
 116             msg_warn("%s: too much text: %.100s", myname, addr);
 117         return (0);
 118     }
 119     strncpy(hostaddr.buf, addr + 1, address_bytes);
 120     hostaddr.buf[address_bytes] = 0;
 121     return (valid_mailhost_addr(hostaddr.buf, gripe) != 0);
 122 }
 123
 124 #ifdef TEST
 125
 126  /*
 127   * Test program - reads hostnames from stdin, reports invalid hostnames to
 128   * stderr.
 129   */
 130 #include <stdlib.h>
 131
 132 #include <vstring.h>
 133 #include <vstream.h>
 134 #include <vstring_vstream.h>
 135 #include <msg_vstream.h>
 136
 137 int     main(int unused_argc, char **argv)
 138 {
 139     VSTRING *buffer = vstring_alloc(1);
 140
 141     msg_vstream_init(argv[0], VSTREAM_ERR);
 142     msg_verbose = 1;
 143
 144     while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
 145         msg_info("testing: \"%s\"", vstring_str(buffer));
 146         if (vstring_str(buffer)[0] == '[')
 147             valid_mailhost_literal(vstring_str(buffer), DO_GRIPE);
 148         else
 149             valid_mailhost_addr(vstring_str(buffer), DO_GRIPE);
 150     }
 151     exit(0);
 152 }
 153
 154 #endif