blob: 93cf1f89e5d9a5eb4bfbab87a0d6cb2e333cd817 [file] [log] [blame]
/*
* General purpose functions.
*
* Copyright 2000-2007 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <ctype.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <common/config.h>
#include <common/standard.h>
#include <proto/log.h>
/* enough to store 10 integers of :
* 2^64-1 = 18446744073709551615 or
* -2^63 = -9223372036854775808
*/
char itoa_str[10][21];
/*
* copies at most <size-1> chars from <src> to <dst>. Last char is always
* set to 0, unless <size> is 0. The number of chars copied is returned
* (excluding the terminating zero).
* This code has been optimized for size and speed : on x86, it's 45 bytes
* long, uses only registers, and consumes only 4 cycles per char.
*/
int strlcpy2(char *dst, const char *src, int size)
{
char *orig = dst;
if (size) {
while (--size && (*dst = *src)) {
src++; dst++;
}
*dst = 0;
}
return dst - orig;
}
/*
* This function simply returns a locally allocated string containing
* the ascii representation for number 'n' in decimal.
*/
const char *ultoa_r(unsigned long n, char *buffer, int size)
{
char *pos;
pos = buffer + size - 1;
*pos-- = '\0';
do {
*pos-- = '0' + n % 10;
n /= 10;
} while (n && pos >= buffer);
return pos + 1;
}
/*
* This function simply returns a locally allocated string containing the ascii
* representation for number 'n' in decimal, unless n is 0 in which case it
* returns the alternate string (or an empty string if the alternate string is
* NULL). It use is intended for limits reported in reports, where it's
* desirable not to display anything if there is no limit. Warning! it shares
* the same vector as ultoa_r().
*/
const char *limit_r(unsigned long n, char *buffer, int size, const char *alt)
{
return (n) ? ultoa_r(n, buffer, size) : (alt ? alt : "");
}
/*
* converts <str> to a struct sockaddr_un* which is locally allocated.
* The format is "/path", where "/path" is a path to a UNIX domain socket.
*/
struct sockaddr_un *str2sun(char *str)
{
static struct sockaddr_un su;
int strsz; /* length included null */
memset(&su, 0, sizeof(su));
str = strdup(str);
if (str == NULL)
goto out_nofree;
strsz = strlen(str) + 1;
if (strsz > sizeof(su.sun_path)) {
Alert("Socket path '%s' too long (max %d)\n",
str, sizeof(su.sun_path) - 1);
goto out_nofree;
}
su.sun_family = AF_UNIX;
memcpy(su.sun_path, str, strsz);
free(str);
out_nofree:
return &su;
}
/*
* Returns non-zero if character <s> is a hex digit (0-9, a-f, A-F), else zero.
*
* It looks like this one would be a good candidate for inlining, but this is
* not interesting because it around 35 bytes long and often called multiple
* times within the same function.
*/
int ishex(char s)
{
s -= '0';
if ((unsigned char)s <= 9)
return 1;
s -= 'A' - '0';
if ((unsigned char)s <= 5)
return 1;
s -= 'a' - 'A';
if ((unsigned char)s <= 5)
return 1;
return 0;
}
/*
* Checks <name> for invalid characters. Valid chars are [A-Za-z0-9_:.-]. If an
* invalid character is found, a pointer to it is returned. If everything is
* fine, NULL is returned.
*/
const char *invalid_char(const char *name)
{
if (!*name)
return name;
while (*name) {
if (!isalnum((int)*name) && *name != '.' && *name != ':' &&
*name != '_' && *name != '-')
return name;
name++;
}
return NULL;
}
/*
* converts <str> to a struct sockaddr_in* which is locally allocated.
* The format is "addr:port", where "addr" can be a dotted IPv4 address,
* a host name, or empty or "*" to indicate INADDR_ANY.
*/
struct sockaddr_in *str2sa(char *str)
{
static struct sockaddr_in sa;
char *c;
int port;
memset(&sa, 0, sizeof(sa));
str = strdup(str);
if (str == NULL)
goto out_nofree;
if ((c = strrchr(str,':')) != NULL) {
*c++ = '\0';
port = atol(c);
}
else
port = 0;
if (*str == '*' || *str == '\0') { /* INADDR_ANY */
sa.sin_addr.s_addr = INADDR_ANY;
}
else if (!inet_pton(AF_INET, str, &sa.sin_addr)) {
struct hostent *he;
if ((he = gethostbyname(str)) == NULL) {
Alert("Invalid server name: '%s'\n", str);
}
else
sa.sin_addr = *(struct in_addr *) *(he->h_addr_list);
}
sa.sin_port = htons(port);
sa.sin_family = AF_INET;
free(str);
out_nofree:
return &sa;
}
/*
* converts <str> to two struct in_addr* which must be pre-allocated.
* The format is "addr[/mask]", where "addr" cannot be empty, and mask
* is optionnal and either in the dotted or CIDR notation.
* Note: "addr" can also be a hostname. Returns 1 if OK, 0 if error.
*/
int str2net(const char *str, struct in_addr *addr, struct in_addr *mask)
{
__label__ out_free, out_err;
char *c, *s;
int ret_val;
unsigned long len;
s = strdup(str);
if (!s)
return 0;
memset(mask, 0, sizeof(*mask));
memset(addr, 0, sizeof(*addr));
if ((c = strrchr(s, '/')) != NULL) {
*c++ = '\0';
/* c points to the mask */
if (strchr(c, '.') != NULL) { /* dotted notation */
if (!inet_pton(AF_INET, c, mask))
goto out_err;
}
else { /* mask length */
char *err;
len = strtol(c, &err, 10);
if (!*c || (err && *err) || (unsigned)len > 32)
goto out_err;
if (len)
mask->s_addr = htonl(~0UL << (32 - len));
else
mask->s_addr = 0;
}
}
else {
mask->s_addr = ~0U;
}
if (!inet_pton(AF_INET, s, addr)) {
struct hostent *he;
if ((he = gethostbyname(s)) == NULL) {
goto out_err;
}
else
*addr = *(struct in_addr *) *(he->h_addr_list);
}
ret_val = 1;
out_free:
free(s);
return ret_val;
out_err:
ret_val = 0;
goto out_free;
}
/*
* Parse IP address found in url.
*/
static int url2ip(const char *addr, struct in_addr *dst)
{
int saw_digit, octets, ch;
u_char tmp[4], *tp;
const char *cp = addr;
saw_digit = 0;
octets = 0;
*(tp = tmp) = 0;
while (*addr) {
unsigned char digit = (ch = *addr++) - '0';
if (digit > 9 && ch != '.')
break;
if (digit <= 9) {
u_int new = *tp * 10 + digit;
if (new > 255)
return 0;
*tp = new;
if (!saw_digit) {
if (++octets > 4)
return 0;
saw_digit = 1;
}
} else if (ch == '.' && saw_digit) {
if (octets == 4)
return 0;
*++tp = 0;
saw_digit = 0;
} else
return 0;
}
if (octets < 4)
return 0;
memcpy(&dst->s_addr, tmp, 4);
return addr-cp-1;
}
/*
* Resolve destination server from URL. Convert <str> to a sockaddr_in*.
*/
int url2sa(const char *url, int ulen, struct sockaddr_in *addr)
{
const char *curr = url, *cp = url;
int ret, url_code = 0;
unsigned int http_code = 0;
/* Cleanup the room */
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = 0;
addr->sin_port = 0;
/* Firstly, try to find :// pattern */
while (curr < url+ulen && url_code != 0x3a2f2f) {
url_code = ((url_code & 0xffff) << 8);
url_code += (unsigned char)*curr++;
}
/* Secondly, if :// pattern is found, verify parsed stuff
* before pattern is matching our http pattern.
* If so parse ip address and port in uri.
*
* WARNING: Current code doesn't support dynamic async dns resolver.
*/
if (url_code == 0x3a2f2f) {
while (cp < curr - 3)
http_code = (http_code << 8) + *cp++;
http_code |= 0x20202020; /* Turn everything to lower case */
/* HTTP url matching */
if (http_code == 0x68747470) {
/* We are looking for IP address. If you want to parse and
* resolve hostname found in url, you can use str2sa(), but
* be warned this can slow down global daemon performances
* while handling lagging dns responses.
*/
ret = url2ip(curr, &addr->sin_addr);
if (!ret)
return -1;
curr += ret;
addr->sin_port = (*curr == ':') ? str2uic(++curr) : 80;
addr->sin_port = htons(addr->sin_port);
}
return 0;
}
return -1;
}
/* will try to encode the string <string> replacing all characters tagged in
* <map> with the hexadecimal representation of their ASCII-code (2 digits)
* prefixed by <escape>, and will store the result between <start> (included)
* and <stop> (excluded), and will always terminate the string with a '\0'
* before <stop>. The position of the '\0' is returned if the conversion
* completes. If bytes are missing between <start> and <stop>, then the
* conversion will be incomplete and truncated. If <stop> <= <start>, the '\0'
* cannot even be stored so we return <start> without writing the 0.
* The input string must also be zero-terminated.
*/
const char hextab[16] = "0123456789ABCDEF";
char *encode_string(char *start, char *stop,
const char escape, const fd_set *map,
const char *string)
{
if (start < stop) {
stop--; /* reserve one byte for the final '\0' */
while (start < stop && *string != '\0') {
if (!FD_ISSET((unsigned char)(*string), map))
*start++ = *string;
else {
if (start + 3 >= stop)
break;
*start++ = escape;
*start++ = hextab[(*string >> 4) & 15];
*start++ = hextab[*string & 15];
}
string++;
}
*start = '\0';
}
return start;
}
unsigned int str2ui(const char *s)
{
return __str2ui(s);
}
unsigned int str2uic(const char *s)
{
return __str2uic(s);
}
unsigned int strl2ui(const char *s, int len)
{
return __strl2ui(s, len);
}
unsigned int strl2uic(const char *s, int len)
{
return __strl2uic(s, len);
}
/* This one is 7 times faster than strtol() on athlon with checks.
* It returns the value of the number composed of all valid digits read,
* and can process negative numbers too.
*/
int strl2ic(const char *s, int len)
{
int i = 0;
int j, k;
if (len > 0) {
if (*s != '-') {
/* positive number */
while (len-- > 0) {
j = (*s++) - '0';
k = i * 10;
if (j > 9)
break;
i = k + j;
}
} else {
/* negative number */
s++;
while (--len > 0) {
j = (*s++) - '0';
k = i * 10;
if (j > 9)
break;
i = k - j;
}
}
}
return i;
}
/* This function reads exactly <len> chars from <s> and converts them to a
* signed integer which it stores into <ret>. It accurately detects any error
* (truncated string, invalid chars, overflows). It is meant to be used in
* applications designed for hostile environments. It returns zero when the
* number has successfully been converted, non-zero otherwise. When an error
* is returned, the <ret> value is left untouched. It is yet 5 to 40 times
* faster than strtol().
*/
int strl2irc(const char *s, int len, int *ret)
{
int i = 0;
int j;
if (!len)
return 1;
if (*s != '-') {
/* positive number */
while (len-- > 0) {
j = (*s++) - '0';
if (j > 9) return 1; /* invalid char */
if (i > INT_MAX / 10) return 1; /* check for multiply overflow */
i = i * 10;
if (i + j < i) return 1; /* check for addition overflow */
i = i + j;
}
} else {
/* negative number */
s++;
while (--len > 0) {
j = (*s++) - '0';
if (j > 9) return 1; /* invalid char */
if (i < INT_MIN / 10) return 1; /* check for multiply overflow */
i = i * 10;
if (i - j > i) return 1; /* check for subtract overflow */
i = i - j;
}
}
*ret = i;
return 0;
}
/* This function reads exactly <len> chars from <s> and converts them to a
* signed integer which it stores into <ret>. It accurately detects any error
* (truncated string, invalid chars, overflows). It is meant to be used in
* applications designed for hostile environments. It returns zero when the
* number has successfully been converted, non-zero otherwise. When an error
* is returned, the <ret> value is left untouched. It is about 3 times slower
* than str2irc().
*/
#ifndef LLONG_MAX
#define LLONG_MAX 9223372036854775807LL
#define LLONG_MIN (-LLONG_MAX - 1LL)
#endif
int strl2llrc(const char *s, int len, long long *ret)
{
long long i = 0;
int j;
if (!len)
return 1;
if (*s != '-') {
/* positive number */
while (len-- > 0) {
j = (*s++) - '0';
if (j > 9) return 1; /* invalid char */
if (i > LLONG_MAX / 10LL) return 1; /* check for multiply overflow */
i = i * 10LL;
if (i + j < i) return 1; /* check for addition overflow */
i = i + j;
}
} else {
/* negative number */
s++;
while (--len > 0) {
j = (*s++) - '0';
if (j > 9) return 1; /* invalid char */
if (i < LLONG_MIN / 10LL) return 1; /* check for multiply overflow */
i = i * 10LL;
if (i - j > i) return 1; /* check for subtract overflow */
i = i - j;
}
}
*ret = i;
return 0;
}
/* This function parses a time value optionally followed by a unit suffix among
* "d", "h", "m", "s", "ms" or "us". It converts the value into the unit
* expected by the caller. The computation does its best to avoid overflows.
* The value is returned in <ret> if everything is fine, and a NULL is returned
* by the function. In case of error, a pointer to the error is returned and
* <ret> is left untouched. Values are automatically rounded up when needed.
*/
const char *parse_time_err(const char *text, unsigned *ret, unsigned unit_flags)
{
unsigned imult, idiv;
unsigned omult, odiv;
unsigned value;
omult = odiv = 1;
switch (unit_flags & TIME_UNIT_MASK) {
case TIME_UNIT_US: omult = 1000000; break;
case TIME_UNIT_MS: omult = 1000; break;
case TIME_UNIT_S: break;
case TIME_UNIT_MIN: odiv = 60; break;
case TIME_UNIT_HOUR: odiv = 3600; break;
case TIME_UNIT_DAY: odiv = 86400; break;
default: break;
}
value = 0;
while (1) {
unsigned int j;
j = *text - '0';
if (j > 9)
break;
text++;
value *= 10;
value += j;
}
imult = idiv = 1;
switch (*text) {
case '\0': /* no unit = default unit */
imult = omult = idiv = odiv = 1;
break;
case 's': /* second = unscaled unit */
break;
case 'u': /* microsecond : "us" */
if (text[1] == 's') {
idiv = 1000000;
text++;
}
break;
case 'm': /* millisecond : "ms" or minute: "m" */
if (text[1] == 's') {
idiv = 1000;
text++;
} else
imult = 60;
break;
case 'h': /* hour : "h" */
imult = 3600;
break;
case 'd': /* day : "d" */
imult = 86400;
break;
default:
return text;
break;
}
if (omult % idiv == 0) { omult /= idiv; idiv = 1; }
if (idiv % omult == 0) { idiv /= omult; omult = 1; }
if (imult % odiv == 0) { imult /= odiv; odiv = 1; }
if (odiv % imult == 0) { odiv /= imult; imult = 1; }
value = (value * (imult * omult) + (idiv * odiv - 1)) / (idiv * odiv);
*ret = value;
return NULL;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/