inet.c File Reference

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "uv.h"
#include "uv-common.h"

Go to the source code of this file.

Macros
#define	UV__INET_ADDRSTRLEN   16
#define	UV__INET6_ADDRSTRLEN   46

Functions
static int	inet_ntop4 (const unsigned char *src, char *dst, size_t size)
static int	inet_ntop6 (const unsigned char *src, char *dst, size_t size)
static int	inet_pton4 (const char *src, unsigned char *dst)
static int	inet_pton6 (const char *src, unsigned char *dst)
int	uv_inet_ntop (int af, const void *src, char *dst, size_t size)
int	uv_inet_pton (int af, const char *src, void *dst)

Macro Definition Documentation

UV__INET6_ADDRSTRLEN

#define UV__INET6_ADDRSTRLEN   46

Definition at line 31 of file inet.c.

UV__INET_ADDRSTRLEN

#define UV__INET_ADDRSTRLEN   16

Definition at line 30 of file inet.c.

Function Documentation

inet_ntop4()

static int inet_ntop4 ( const unsigned char *  src, char *  dst, size_t  size  )

static

Definition at line 53 of file inet.c.

                                                                        {
  static const char fmt[] = "%u.%u.%u.%u";
  char tmp[UV__INET_ADDRSTRLEN];
  int l;
 
  l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
  if (l <= 0 || (size_t) l >= size) {
    return UV_ENOSPC;
  }
  uv__strscpy(dst, tmp, size);
  return 0;
}

References dst, snprintf, src, autogen_x86imm::tmp, UV__INET_ADDRSTRLEN, and uv__strscpy().

Referenced by inet_ntop6(), and uv_inet_ntop().

inet_ntop6()

static int inet_ntop6 ( const unsigned char *  src, char *  dst, size_t  size  )

static

Definition at line 67 of file inet.c.

                                                                        {
  /*
   * Note that int32_t and int16_t need only be "at least" large enough
   * to contain a value of the specified size.  On some systems, like
   * Crays, there is no such thing as an integer variable with 16 bits.
   * Keep this in mind if you think this function should have been coded
   * to use pointer overlays.  All the world's not a VAX.
   */
  char tmp[UV__INET6_ADDRSTRLEN], *tp;
  struct { int base, len; } best, cur;
  unsigned int words[sizeof(struct in6_addr) / sizeof(uint16_t)];
  int i;
 
  /*
   * Preprocess:
   *  Copy the input (bytewise) array into a wordwise array.
   *  Find the longest run of 0x00's in src[] for :: shorthanding.
   */
  memset(words, '\0', sizeof words);
  for (i = 0; i < (int) sizeof(struct in6_addr); i++)
    words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
  best.base = -1;
  best.len = 0;
  cur.base = -1;
  cur.len = 0;
  for (i = 0; i < (int) ARRAY_SIZE(words); i++) {
    if (words[i] == 0) {
      if (cur.base == -1)
        cur.base = i, cur.len = 1;
      else
        cur.len++;
    } else {
      if (cur.base != -1) {
        if (best.base == -1 || cur.len > best.len)
          best = cur;
        cur.base = -1;
      }
    }
  }
  if (cur.base != -1) {
    if (best.base == -1 || cur.len > best.len)
      best = cur;
  }
  if (best.base != -1 && best.len < 2)
    best.base = -1;
 
  /*
   * Format the result.
   */
  tp = tmp;
  for (i = 0; i < (int) ARRAY_SIZE(words); i++) {
    /* Are we inside the best run of 0x00's? */
    if (best.base != -1 && i >= best.base &&
        i < (best.base + best.len)) {
      if (i == best.base)
        *tp++ = ':';
      continue;
    }
    /* Are we following an initial run of 0x00s or any real hex? */
    if (i != 0)
      *tp++ = ':';
    /* Is this address an encapsulated IPv4? */
    if (i == 6 && best.base == 0 && (best.len == 6 ||
        (best.len == 7 && words[7] != 0x0001) ||
        (best.len == 5 && words[5] == 0xffff))) {
      int err = inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp));
      if (err)
        return err;
      tp += strlen(tp);
      break;
    }
    tp += sprintf(tp, "%x", words[i]);
  }
  /* Was it a trailing run of 0x00's? */
  if (best.base != -1 && (best.base + best.len) == ARRAY_SIZE(words))
    *tp++ = ':';
  *tp++ = '\0';
  if (UV_E2BIG == uv__strscpy(dst, tmp, size))
    return UV_ENOSPC;
  return 0;
}

References ARRAY_SIZE, dst, err, i, inet_ntop4(), int, len, memset(), sprintf, src, autogen_x86imm::tmp, UV__INET6_ADDRSTRLEN, and uv__strscpy().

Referenced by uv_inet_ntop().

inet_pton4()

static int inet_pton4 ( const char *  src, unsigned char *  dst  )

static

Definition at line 179 of file inet.c.

                                                           {
  static const char digits[] = "0123456789";
  int saw_digit, octets, ch;
  unsigned char tmp[sizeof(struct in_addr)], *tp;
 
  saw_digit = 0;
  octets = 0;
  *(tp = tmp) = 0;
  while ((ch = *src++) != '\0') {
    const char *pch;
 
    if ((pch = strchr(digits, ch)) != NULL) {
      unsigned int nw = *tp * 10 + (pch - digits);
 
      if (saw_digit && *tp == 0)
        return UV_EINVAL;
      if (nw > 255)
        return UV_EINVAL;
      *tp = nw;
      if (!saw_digit) {
        if (++octets > 4)
          return UV_EINVAL;
        saw_digit = 1;
      }
    } else if (ch == '.' && saw_digit) {
      if (octets == 4)
        return UV_EINVAL;
      *++tp = 0;
      saw_digit = 0;
    } else
      return UV_EINVAL;
  }
  if (octets < 4)
    return UV_EINVAL;
  memcpy(dst, tmp, sizeof(struct in_addr));
  return 0;
}

References dst, memcpy(), NULL, src, and autogen_x86imm::tmp.

Referenced by inet_pton6(), and uv_inet_pton().

inet_pton6()

static int inet_pton6 ( const char *  src, unsigned char *  dst  )

static

Definition at line 218 of file inet.c.

                                                           {
  static const char xdigits_l[] = "0123456789abcdef",
                    xdigits_u[] = "0123456789ABCDEF";
  unsigned char tmp[sizeof(struct in6_addr)], *tp, *endp, *colonp;
  const char *xdigits, *curtok;
  int ch, seen_xdigits;
  unsigned int val;
 
  memset((tp = tmp), '\0', sizeof tmp);
  endp = tp + sizeof tmp;
  colonp = NULL;
  /* Leading :: requires some special handling. */
  if (*src == ':')
    if (*++src != ':')
      return UV_EINVAL;
  curtok = src;
  seen_xdigits = 0;
  val = 0;
  while ((ch = *src++) != '\0') {
    const char *pch;
 
    if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
      pch = strchr((xdigits = xdigits_u), ch);
    if (pch != NULL) {
      val <<= 4;
      val |= (pch - xdigits);
      if (++seen_xdigits > 4)
        return UV_EINVAL;
      continue;
    }
    if (ch == ':') {
      curtok = src;
      if (!seen_xdigits) {
        if (colonp)
          return UV_EINVAL;
        colonp = tp;
        continue;
      } else if (*src == '\0') {
        return UV_EINVAL;
      }
      if (tp + sizeof(uint16_t) > endp)
        return UV_EINVAL;
      *tp++ = (unsigned char) (val >> 8) & 0xff;
      *tp++ = (unsigned char) val & 0xff;
      seen_xdigits = 0;
      val = 0;
      continue;
    }
    if (ch == '.' && ((tp + sizeof(struct in_addr)) <= endp)) {
      int err = inet_pton4(curtok, tp);
      if (err == 0) {
        tp += sizeof(struct in_addr);
        seen_xdigits = 0;
        break;  /*%< '\\0' was seen by inet_pton4(). */
      }
    }
    return UV_EINVAL;
  }
  if (seen_xdigits) {
    if (tp + sizeof(uint16_t) > endp)
      return UV_EINVAL;
    *tp++ = (unsigned char) (val >> 8) & 0xff;
    *tp++ = (unsigned char) val & 0xff;
  }
  if (colonp != NULL) {
    /*
     * Since some memmove()'s erroneously fail to handle
     * overlapping regions, we'll do the shift by hand.
     */
    const int n = tp - colonp;
    int i;
 
    if (tp == endp)
      return UV_EINVAL;
    for (i = 1; i <= n; i++) {
      endp[- i] = colonp[n - i];
      colonp[n - i] = 0;
    }
    tp = endp;
  }
  if (tp != endp)
    return UV_EINVAL;
  memcpy(dst, tmp, sizeof tmp);
  return 0;
}

References dst, err, i, inet_pton4(), memcpy(), memset(), n, NULL, src, autogen_x86imm::tmp, and val.

Referenced by uv_inet_pton().

uv_inet_ntop()

int uv_inet_ntop	(	int	af,
		const void *	src,
		char *	dst,
		size_t	size
	)

Definition at line 40 of file inet.c.

                                                                  {
  switch (af) {
  case AF_INET:
    return (inet_ntop4(src, dst, size));
  case AF_INET6:
    return (inet_ntop6(src, dst, size));
  default:
    return UV_EAFNOSUPPORT;
  }
  /* NOTREACHED */
}

References AF_INET, AF_INET6, dst, inet_ntop4(), inet_ntop6(), and src.

Referenced by uv_ip4_name(), and uv_ip6_name().

uv_inet_pton()

int uv_inet_pton	(	int	af,
		const char *	src,
		void *	dst
	)

Definition at line 150 of file inet.c.

                                                     {
  if (src == NULL || dst == NULL)
    return UV_EINVAL;
 
  switch (af) {
  case AF_INET:
    return (inet_pton4(src, dst));
  case AF_INET6: {
    int len;
    char tmp[UV__INET6_ADDRSTRLEN], *s, *p;
    s = (char*) src;
    p = strchr(src, '%');
    if (p != NULL) {
      s = tmp;
      len = p - src;
      if (len > UV__INET6_ADDRSTRLEN-1)
        return UV_EINVAL;
      memcpy(s, src, len);
      s[len] = '\0';
    }
    return inet_pton6(s, dst);
  }
  default:
    return UV_EAFNOSUPPORT;
  }
  /* NOTREACHED */
}

References AF_INET, AF_INET6, dst, inet_pton4(), inet_pton6(), len, memcpy(), NULL, p, s, src, autogen_x86imm::tmp, and UV__INET6_ADDRSTRLEN.

Referenced by uv__udp_set_membership4(), uv__udp_set_source_membership4(), uv_ip4_addr(), and uv_ip6_addr().