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apache/modules/proxy/proxy_util.c
Roy T. Fielding e3e87d34a0 Apache 1.3.9 baseline for the Apache 2.0 repository. 
Obtained from: Apache 1.3.9 (minus unused files), tag APACHE_1_3_9
Submitted by: Apache Group


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83751 13f79535-47bb-0310-9956-ffa450edef68
1999-08-24 06:55:44 +00:00

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/* ====================================================================
* Copyright (c) 1996-1999 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/* Utility routines for Apache proxy */
#include "mod_proxy.h"
#include "http_main.h"
#include "ap_md5.h"
#include "multithread.h"
#include "http_log.h"
#include "util_uri.h"
#include "util_date.h" /* get ap_checkmask() decl. */
static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r);
static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r);
static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r);
static int proxy_match_word(struct dirconn_entry *This, request_rec *r);
/* already called in the knowledge that the characters are hex digits */
int ap_proxy_hex2c(const char *x)
{
int i, ch;
#ifndef CHARSET_EBCDIC
ch = x[0];
if (ap_isdigit(ch))
i = ch - '0';
else if (ap_isupper(ch))
i = ch - ('A' - 10);
else
i = ch - ('a' - 10);
i <<= 4;
ch = x[1];
if (ap_isdigit(ch))
i += ch - '0';
else if (ap_isupper(ch))
i += ch - ('A' - 10);
else
i += ch - ('a' - 10);
return i;
#else /*CHARSET_EBCDIC*/
return (1 == sscanf(x, "%2x", &i)) ? os_toebcdic[i&0xFF] : 0;
#endif /*CHARSET_EBCDIC*/
}
void ap_proxy_c2hex(int ch, char *x)
{
#ifndef CHARSET_EBCDIC
int i;
x[0] = '%';
i = (ch & 0xF0) >> 4;
if (i >= 10)
x[1] = ('A' - 10) + i;
else
x[1] = '0' + i;
i = ch & 0x0F;
if (i >= 10)
x[2] = ('A' - 10) + i;
else
x[2] = '0' + i;
#else /*CHARSET_EBCDIC*/
static const char ntoa[] = { "0123456789ABCDEF" };
ch &= 0xFF;
x[0] = '%';
x[1] = ntoa[(os_toascii[ch]>>4)&0x0F];
x[2] = ntoa[os_toascii[ch]&0x0F];
x[3] = '\0';
#endif /*CHARSET_EBCDIC*/
}
/*
* canonicalise a URL-encoded string
*/
/*
* Convert a URL-encoded string to canonical form.
* It decodes characters which need not be encoded,
* and encodes those which must be encoded, and does not touch
* those which must not be touched.
*/
char *
ap_proxy_canonenc(pool *p, const char *x, int len, enum enctype t, int isenc)
{
int i, j, ch;
char *y;
const char *allowed; /* characters which should not be encoded */
const char *reserved; /* characters which much not be en/de-coded */
/* N.B. in addition to :@&=, this allows ';' in an http path
* and '?' in an ftp path -- this may be revised
*
* Also, it makes a '+' character in a search string reserved, as
* it may be form-encoded. (Although RFC 1738 doesn't allow this -
* it only permits ; / ? : @ = & as reserved chars.)
*/
if (t == enc_path)
allowed = "$-_.+!*'(),;:@&=";
else if (t == enc_search)
allowed = "$-_.!*'(),;:@&=";
else if (t == enc_user)
allowed = "$-_.+!*'(),;@&=";
else if (t == enc_fpath)
allowed = "$-_.+!*'(),?:@&=";
else /* if (t == enc_parm) */
allowed = "$-_.+!*'(),?/:@&=";
if (t == enc_path)
reserved = "/";
else if (t == enc_search)
reserved = "+";
else
reserved = "";
y = ap_palloc(p, 3 * len + 1);
for (i = 0, j = 0; i < len; i++, j++) {
/* always handle '/' first */
ch = x[i];
if (strchr(reserved, ch)) {
y[j] = ch;
continue;
}
/* decode it if not already done */
if (isenc && ch == '%') {
if (!ap_isxdigit(x[i + 1]) || !ap_isxdigit(x[i + 2]))
return NULL;
ch = ap_proxy_hex2c(&x[i + 1]);
i += 2;
if (ch != 0 && strchr(reserved, ch)) { /* keep it encoded */
ap_proxy_c2hex(ch, &y[j]);
j += 2;
continue;
}
}
/* recode it, if necessary */
if (!ap_isalnum(ch) && !strchr(allowed, ch)) {
ap_proxy_c2hex(ch, &y[j]);
j += 2;
}
else
y[j] = ch;
}
y[j] = '\0';
return y;
}
/*
* Parses network-location.
* urlp on input the URL; on output the path, after the leading /
* user NULL if no user/password permitted
* password holder for password
* host holder for host
* port port number; only set if one is supplied.
*
* Returns an error string.
*/
char *
ap_proxy_canon_netloc(pool *p, char **const urlp, char **userp,
char **passwordp, char **hostp, int *port)
{
int i;
char *strp, *host, *url = *urlp;
char *user = NULL, *password = NULL;
if (url[0] != '/' || url[1] != '/')
return "Malformed URL";
host = url + 2;
url = strchr(host, '/');
if (url == NULL)
url = "";
else
*(url++) = '\0'; /* skip seperating '/' */
/* find _last_ '@' since it might occur in user/password part */
strp = strrchr(host, '@');
if (strp != NULL) {
*strp = '\0';
user = host;
host = strp + 1;
/* find password */
strp = strchr(user, ':');
if (strp != NULL) {
*strp = '\0';
password = ap_proxy_canonenc(p, strp + 1, strlen(strp + 1), enc_user, 1);
if (password == NULL)
return "Bad %-escape in URL (password)";
}
user = ap_proxy_canonenc(p, user, strlen(user), enc_user, 1);
if (user == NULL)
return "Bad %-escape in URL (username)";
}
if (userp != NULL) {
*userp = user;
}
if (passwordp != NULL) {
*passwordp = password;
}
strp = strrchr(host, ':');
if (strp != NULL) {
*(strp++) = '\0';
for (i = 0; strp[i] != '\0'; i++)
if (!ap_isdigit(strp[i]))
break;
/* if (i == 0) the no port was given; keep default */
if (strp[i] != '\0') {
return "Bad port number in URL";
} else if (i > 0) {
*port = atoi(strp);
if (*port > 65535)
return "Port number in URL > 65535";
}
}
ap_str_tolower(host); /* DNS names are case-insensitive */
if (*host == '\0')
return "Missing host in URL";
/* check hostname syntax */
for (i = 0; host[i] != '\0'; i++)
if (!ap_isdigit(host[i]) && host[i] != '.')
break;
/* must be an IP address */
#ifdef WIN32
if (host[i] == '\0' && (inet_addr(host) == -1))
#else
if (host[i] == '\0' && (ap_inet_addr(host) == -1 || inet_network(host) == -1))
#endif
{
return "Bad IP address in URL";
}
/* if (strchr(host,'.') == NULL && domain != NULL)
host = pstrcat(p, host, domain, NULL);
*/
*urlp = url;
*hostp = host;
return NULL;
}
static const char * const lwday[7] =
{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
/*
* If the date is a valid RFC 850 date or asctime() date, then it
* is converted to the RFC 1123 format, otherwise it is not modified.
* This routine is not very fast at doing conversions, as it uses
* sscanf and sprintf. However, if the date is already correctly
* formatted, then it exits very quickly.
*/
const char *
ap_proxy_date_canon(pool *p, const char *x)
{
int wk, mday, year, hour, min, sec, mon;
char *q, month[4], zone[4], week[4];
q = strchr(x, ',');
/* check for RFC 850 date */
if (q != NULL && q - x > 3 && q[1] == ' ') {
*q = '\0';
for (wk = 0; wk < 7; wk++)
if (strcmp(x, lwday[wk]) == 0)
break;
*q = ',';
if (wk == 7)
return x; /* not a valid date */
if (q[4] != '-' || q[8] != '-' || q[11] != ' ' || q[14] != ':' ||
q[17] != ':' || strcmp(&q[20], " GMT") != 0)
return x;
if (sscanf(q + 2, "%u-%3s-%u %u:%u:%u %3s", &mday, month, &year,
&hour, &min, &sec, zone) != 7)
return x;
if (year < 70)
year += 2000;
else
year += 1900;
}
else {
/* check for acstime() date */
if (x[3] != ' ' || x[7] != ' ' || x[10] != ' ' || x[13] != ':' ||
x[16] != ':' || x[19] != ' ' || x[24] != '\0')
return x;
if (sscanf(x, "%3s %3s %u %u:%u:%u %u", week, month, &mday, &hour,
&min, &sec, &year) != 7)
return x;
for (wk = 0; wk < 7; wk++)
if (strcmp(week, ap_day_snames[wk]) == 0)
break;
if (wk == 7)
return x;
}
/* check date */
for (mon = 0; mon < 12; mon++)
if (strcmp(month, ap_month_snames[mon]) == 0)
break;
if (mon == 12)
return x;
q = ap_palloc(p, 30);
ap_snprintf(q, 30, "%s, %.2d %s %d %.2d:%.2d:%.2d GMT", ap_day_snames[wk], mday,
ap_month_snames[mon], year, hour, min, sec);
return q;
}
/* NOTE: This routine is taken from http_protocol::getline()
* because the old code found in the proxy module was too
* difficult to understand and maintain.
*/
/* Get a line of protocol input, including any continuation lines
* caused by MIME folding (or broken clients) if fold != 0, and place it
* in the buffer s, of size n bytes, without the ending newline.
*
* Returns -1 on error, or the length of s.
*
* Note: Because bgets uses 1 char for newline and 1 char for NUL,
* the most we can get is (n - 2) actual characters if it
* was ended by a newline, or (n - 1) characters if the line
* length exceeded (n - 1). So, if the result == (n - 1),
* then the actual input line exceeded the buffer length,
* and it would be a good idea for the caller to puke 400 or 414.
*/
static int proxy_getline(char *s, int n, BUFF *in, int fold)
{
char *pos, next;
int retval;
int total = 0;
pos = s;
do {
retval = ap_bgets(pos, n, in); /* retval == -1 if error, 0 if EOF */
if (retval <= 0)
return ((retval < 0) && (total == 0)) ? -1 : total;
/* retval is the number of characters read, not including NUL */
n -= retval; /* Keep track of how much of s is full */
pos += (retval - 1); /* and where s ends */
total += retval; /* and how long s has become */
if (*pos == '\n') { /* Did we get a full line of input? */
*pos = '\0';
--total;
++n;
}
else
return total; /* if not, input line exceeded buffer size */
/* Continue appending if line folding is desired and
* the last line was not empty and we have room in the buffer and
* the next line begins with a continuation character.
*/
} while (fold && (retval != 1) && (n > 1)
&& (ap_blookc(&next, in) == 1)
&& ((next == ' ') || (next == '\t')));
return total;
}
/*
* Reads headers from a buffer and returns an array of headers.
* Returns NULL on file error
* This routine tries to deal with too long lines and continuation lines.
* @@@: XXX: FIXME: currently the headers are passed thru un-merged.
* Is that okay, or should they be collapsed where possible?
*/
table *ap_proxy_read_headers(request_rec *r, char *buffer, int size, BUFF *f)
{
table *resp_hdrs;
int len;
char *value, *end;
char field[MAX_STRING_LEN];
resp_hdrs = ap_make_table(r->pool, 20);
/*
* Read header lines until we get the empty separator line, a read error,
* the connection closes (EOF), or we timeout.
*/
while ((len = proxy_getline(buffer, size, f, 1)) > 0) {
if (!(value = strchr(buffer, ':'))) { /* Find the colon separator */
/* Buggy MS IIS servers sometimes return invalid headers
* (an extra "HTTP/1.0 200, OK" line sprinkled in between
* the usual MIME headers). Try to deal with it in a sensible
* way, but log the fact.
* XXX: The mask check is buggy if we ever see an HTTP/1.10 */
if (!ap_checkmask(buffer, "HTTP/#.# ###*")) {
/* Nope, it wasn't even an extra HTTP header. Give up. */
return NULL;
}
ap_log_error(APLOG_MARK, APLOG_WARNING|APLOG_NOERRNO, r->server,
"proxy: Ignoring duplicate HTTP header "
"returned by %s (%s)", r->uri, r->method);
continue;
}
*value = '\0';
++value;
/* XXX: RFC2068 defines only SP and HT as whitespace, this test is
* wrong... and so are many others probably.
*/
while (ap_isspace(*value))
++value; /* Skip to start of value */
/* should strip trailing whitespace as well */
for (end = &value[strlen(value)-1]; end > value && ap_isspace(*end); --end)
*end = '\0';
ap_table_add(resp_hdrs, buffer, value);
/* the header was too long; at the least we should skip extra data */
if (len >= size - 1) {
while ((len = proxy_getline(field, MAX_STRING_LEN, f, 1))
>= MAX_STRING_LEN - 1) {
/* soak up the extra data */
}
if (len == 0) /* time to exit the larger loop as well */
break;
}
}
return resp_hdrs;
}
long int ap_proxy_send_fb(BUFF *f, request_rec *r, cache_req *c)
{
int ok;
char buf[IOBUFSIZE];
long total_bytes_rcvd;
register int n, o, w;
conn_rec *con = r->connection;
int alternate_timeouts = 1; /* 1 if we alternate between soft & hard timeouts */
total_bytes_rcvd = 0;
if (c != NULL)
c->written = 0;
#ifdef CHARSET_EBCDIC
/* The cache copy is ASCII, not EBCDIC, even for text/html) */
ap_bsetflag(f, B_ASCII2EBCDIC|B_EBCDIC2ASCII, 0);
if (c != NULL && c->fp != NULL)
ap_bsetflag(c->fp, B_ASCII2EBCDIC|B_EBCDIC2ASCII, 0);
ap_bsetflag(con->client, B_ASCII2EBCDIC|B_EBCDIC2ASCII, 0);
#endif
/* Since we are reading from one buffer and writing to another,
* it is unsafe to do a soft_timeout here, at least until the proxy
* has its own timeout handler which can set both buffers to EOUT.
*/
ap_kill_timeout(r);
#ifdef WIN32
/* works fine under win32, so leave it */
ap_hard_timeout("proxy send body", r);
alternate_timeouts = 0;
#else
/* CHECKME! Since hard_timeout won't work in unix on sends with partial
* cache completion, we have to alternate between hard_timeout
* for reads, and soft_timeout for send. This is because we need
* to get a return from ap_bwrite to be able to continue caching.
* BUT, if we *can't* continue anyway, just use hard_timeout.
* (Also, if no cache file is written, use hard timeouts)
*/
if (c == NULL || c->len <= 0 || c->cache_completion == 1.0) {
ap_hard_timeout("proxy send body", r);
alternate_timeouts = 0;
}
#endif
/* Loop and ap_bread() while we can successfully read and write,
* or (after the client aborted) while we can successfully
* read and finish the configured cache_completion.
*/
for (ok = 1; ok; ) {
if (alternate_timeouts)
ap_hard_timeout("proxy recv body from upstream server", r);
/* Read block from server */
n = ap_bread(f, buf, IOBUFSIZE);
if (alternate_timeouts)
ap_kill_timeout(r);
else
ap_reset_timeout(r);
if (n == -1) { /* input error */
if (c != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error reading from %s", c->url);
c = ap_proxy_cache_error(c);
}
break;
}
if (n == 0)
break; /* EOF */
o = 0;
total_bytes_rcvd += n;
/* Write to cache first. */
/*@@@ XXX FIXME: Assuming that writing the cache file won't time out?!!? */
if (c != NULL && c->fp != NULL) {
if (ap_bwrite(c->fp, &buf[0], n) != n) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, c->req,
"proxy: error writing to %s", c->tempfile);
c = ap_proxy_cache_error(c);
} else {
c->written += n;
}
}
/* Write the block to the client, detect aborted transfers */
while (!con->aborted && n > 0) {
if (alternate_timeouts)
ap_soft_timeout("proxy send body", r);
w = ap_bwrite(con->client, &buf[o], n);
if (alternate_timeouts)
ap_kill_timeout(r);
else
ap_reset_timeout(r);
if (w <= 0) {
if (c != NULL && c->fp != NULL) {
/* when a send failure occurs, we need to decide
* whether to continue loading and caching the
* document, or to abort the whole thing
*/
ok = (c->len > 0) &&
(c->cache_completion > 0) &&
(c->len * c->cache_completion < total_bytes_rcvd);
if (! ok) {
ap_pclosef(c->req->pool, c->fp->fd);
c->fp = NULL;
unlink(c->tempfile);
c = NULL;
}
}
con->aborted = 1;
break;
}
n -= w;
o += w;
} /* while client alive and more data to send */
} /* loop and ap_bread while "ok" */
if (!con->aborted)
ap_bflush(con->client);
ap_kill_timeout(r);
return total_bytes_rcvd;
}
/*
* Sends response line and headers. Uses the client fd and the
* headers_out array from the passed request_rec to talk to the client
* and to properly set the headers it sends for things such as logging.
*
* A timeout should be set before calling this routine.
*/
void ap_proxy_send_headers(request_rec *r, const char *respline, table *t)
{
int i;
BUFF *fp = r->connection->client;
table_entry *elts = (table_entry *) ap_table_elts(t)->elts;
ap_bvputs(fp, respline, CRLF, NULL);
for (i = 0; i < ap_table_elts(t)->nelts; ++i) {
if (elts[i].key != NULL) {
ap_bvputs(fp, elts[i].key, ": ", elts[i].val, CRLF, NULL);
ap_table_addn(r->headers_out, elts[i].key, elts[i].val);
}
}
ap_bputs(CRLF, fp);
}
/*
* list is a comma-separated list of case-insensitive tokens, with
* optional whitespace around the tokens.
* The return returns 1 if the token val is found in the list, or 0
* otherwise.
*/
int ap_proxy_liststr(const char *list, const char *val)
{
int len, i;
const char *p;
len = strlen(val);
while (list != NULL) {
p = strchr(list, ',');
if (p != NULL) {
i = p - list;
do
p++;
while (ap_isspace(*p));
}
else
i = strlen(list);
while (i > 0 && ap_isspace(list[i - 1]))
i--;
if (i == len && strncasecmp(list, val, len) == 0)
return 1;
list = p;
}
return 0;
}
#ifdef CASE_BLIND_FILESYSTEM
/*
* On some platforms, the file system is NOT case sensitive. So, a == A
* need to map to smaller set of characters
*/
void ap_proxy_hash(const char *it, char *val, int ndepth, int nlength)
{
AP_MD5_CTX context;
unsigned char digest[16];
char tmp[26];
int i, k, d;
unsigned int x;
static const char enc_table[32] = "abcdefghijklmnopqrstuvwxyz012345";
ap_MD5Init(&context);
ap_MD5Update(&context, (const unsigned char *) it, strlen(it));
ap_MD5Final(digest, &context);
/* encode 128 bits as 26 characters, using a modified uuencoding */
/* the encoding is 5 bytes -> 8 characters
* i.e. 128 bits is 3 x 5 bytes + 1 byte -> 3 * 8 characters + 2 characters
*/
for (i = 0, k = 0; i < 15; i += 5) {
x = (digest[i] << 24) | (digest[i + 1] << 16) | (digest[i + 2] << 8) | digest[i + 3];
tmp[k++] = enc_table[x >> 27];
tmp[k++] = enc_table[(x >> 22) & 0x1f];
tmp[k++] = enc_table[(x >> 17) & 0x1f];
tmp[k++] = enc_table[(x >> 12) & 0x1f];
tmp[k++] = enc_table[(x >> 7) & 0x1f];
tmp[k++] = enc_table[(x >> 2) & 0x1f];
x = ((x & 0x3) << 8) | digest[i + 4];
tmp[k++] = enc_table[x >> 5];
tmp[k++] = enc_table[x & 0x1f];
}
/* one byte left */
x = digest[15];
tmp[k++] = enc_table[x >> 3]; /* use up 5 bits */
tmp[k++] = enc_table[x & 0x7];
/* now split into directory levels */
for (i = k = d = 0; d < ndepth; ++d) {
memcpy(&val[i], &tmp[k], nlength);
k += nlength;
val[i + nlength] = '/';
i += nlength + 1;
}
memcpy(&val[i], &tmp[k], 26 - k);
val[i + 26 - k] = '\0';
}
#else
void ap_proxy_hash(const char *it, char *val, int ndepth, int nlength)
{
AP_MD5_CTX context;
unsigned char digest[16];
char tmp[22];
int i, k, d;
unsigned int x;
#if defined(AIX) && defined(__ps2__)
/* Believe it or not, AIX 1.x does not allow you to name a file '@',
* so hack around it in the encoding. */
static const char enc_table[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_%";
#else
static const char enc_table[64] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_@";
#endif
ap_MD5Init(&context);
ap_MD5Update(&context, (const unsigned char *) it, strlen(it));
ap_MD5Final(digest, &context);
/* encode 128 bits as 22 characters, using a modified uuencoding */
/* the encoding is 3 bytes -> 4 characters
* i.e. 128 bits is 5 x 3 bytes + 1 byte -> 5 * 4 characters + 2 characters
*/
for (i = 0, k = 0; i < 15; i += 3) {
x = (digest[i] << 16) | (digest[i + 1] << 8) | digest[i + 2];
tmp[k++] = enc_table[x >> 18];
tmp[k++] = enc_table[(x >> 12) & 0x3f];
tmp[k++] = enc_table[(x >> 6) & 0x3f];
tmp[k++] = enc_table[x & 0x3f];
}
/* one byte left */
x = digest[15];
tmp[k++] = enc_table[x >> 2]; /* use up 6 bits */
tmp[k++] = enc_table[(x << 4) & 0x3f];
/* now split into directory levels */
for (i = k = d = 0; d < ndepth; ++d) {
memcpy(&val[i], &tmp[k], nlength);
k += nlength;
val[i + nlength] = '/';
i += nlength + 1;
}
memcpy(&val[i], &tmp[k], 22 - k);
val[i + 22 - k] = '\0';
}
#endif /* CASE_BLIND_FILESYSTEM */
/*
* Converts 8 hex digits to a time integer
*/
int ap_proxy_hex2sec(const char *x)
{
int i, ch;
unsigned int j;
for (i = 0, j = 0; i < 8; i++) {
ch = x[i];
j <<= 4;
if (ap_isdigit(ch))
j |= ch - '0';
else if (ap_isupper(ch))
j |= ch - ('A' - 10);
else
j |= ch - ('a' - 10);
}
if (j == 0xffffffff)
return -1; /* so that it works with 8-byte ints */
else
return j;
}
/*
* Converts a time integer to 8 hex digits
*/
void ap_proxy_sec2hex(int t, char *y)
{
int i, ch;
unsigned int j = t;
for (i = 7; i >= 0; i--) {
ch = j & 0xF;
j >>= 4;
if (ch >= 10)
y[i] = ch + ('A' - 10);
else
y[i] = ch + '0';
}
y[8] = '\0';
}
cache_req *ap_proxy_cache_error(cache_req *c)
{
if (c != NULL) {
if (c->fp != NULL) {
ap_pclosef(c->req->pool, c->fp->fd);
c->fp = NULL;
}
if (c->tempfile) unlink(c->tempfile);
}
return NULL;
}
int ap_proxyerror(request_rec *r, int statuscode, const char *message)
{
ap_table_setn(r->notes, "error-notes",
ap_pstrcat(r->pool,
"The proxy server could not handle the request "
"<EM><A HREF=\"", r->uri, "\">",
r->method, "&nbsp;", r->uri, "</A></EM>.<P>\n"
"Reason: <STRONG>", message, "</STRONG>", NULL));
/* Allow the "error-notes" string to be printed by ap_send_error_response() */
ap_table_setn(r->notes, "verbose-error-to", ap_pstrdup(r->pool, "*"));
r->status_line = ap_psprintf(r->pool, "%3.3u Proxy Error", statuscode);
return statuscode;
}
/*
* This routine returns its own error message
*/
const char *
ap_proxy_host2addr(const char *host, struct hostent *reqhp)
{
int i;
struct hostent *hp;
static APACHE_TLS struct hostent hpbuf;
static APACHE_TLS u_long ipaddr;
static APACHE_TLS char *charpbuf[2];
for (i = 0; host[i] != '\0'; i++)
if (!ap_isdigit(host[i]) && host[i] != '.')
break;
if (host[i] != '\0') {
hp = gethostbyname(host);
if (hp == NULL)
return "Host not found";
}
else {
ipaddr = ap_inet_addr(host);
hp = gethostbyaddr((char *) &ipaddr, sizeof(u_long), AF_INET);
if (hp == NULL) {
memset(&hpbuf, 0, sizeof(hpbuf));
hpbuf.h_name = 0;
hpbuf.h_addrtype = AF_INET;
hpbuf.h_length = sizeof(u_long);
hpbuf.h_addr_list = charpbuf;
hpbuf.h_addr_list[0] = (char *) &ipaddr;
hpbuf.h_addr_list[1] = 0;
hp = &hpbuf;
}
}
*reqhp = *hp;
return NULL;
}
static const char *
proxy_get_host_of_request(request_rec *r)
{
char *url, *user = NULL, *password = NULL, *err, *host;
int port = -1;
if (r->hostname != NULL)
return r->hostname;
/* Set url to the first char after "scheme://" */
if ((url = strchr(r->uri, ':')) == NULL
|| url[1] != '/' || url[2] != '/')
return NULL;
url = ap_pstrdup(r->pool, &url[1]); /* make it point to "//", which is what proxy_canon_netloc expects */
err = ap_proxy_canon_netloc(r->pool, &url, &user, &password, &host, &port);
if (err != NULL)
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, r,
"%s", err);
r->hostname = host;
return host; /* ought to return the port, too */
}
/* Return TRUE if addr represents an IP address (or an IP network address) */
int ap_proxy_is_ipaddr(struct dirconn_entry *This, pool *p)
{
const char *addr = This->name;
long ip_addr[4];
int i, quads;
long bits;
/* if the address is given with an explicit netmask, use that */
/* Due to a deficiency in ap_inet_addr(), it is impossible to parse */
/* "partial" addresses (with less than 4 quads) correctly, i.e. */
/* 192.168.123 is parsed as 192.168.0.123, which is not what I want. */
/* I therefore have to parse the IP address manually: */
/*if (proxy_readmask(This->name, &This->addr.s_addr, &This->mask.s_addr) == 0) */
/* addr and mask were set by proxy_readmask() */
/*return 1; */
/* Parse IP addr manually, optionally allowing */
/* abbreviated net addresses like 192.168. */
/* Iterate over up to 4 (dotted) quads. */
for (quads = 0; quads < 4 && *addr != '\0'; ++quads) {
char *tmp;
if (*addr == '/' && quads > 0) /* netmask starts here. */
break;
if (!ap_isdigit(*addr))
return 0; /* no digit at start of quad */
ip_addr[quads] = strtol(addr, &tmp, 0);
if (tmp == addr) /* expected a digit, found something else */
return 0;
if (ip_addr[quads] < 0 || ip_addr[quads] > 255) {
/* invalid octet */
return 0;
}
addr = tmp;
if (*addr == '.' && quads != 3)
++addr; /* after the 4th quad, a dot would be illegal */
}
for (This->addr.s_addr = 0, i = 0; i < quads; ++i)
This->addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
if (addr[0] == '/' && ap_isdigit(addr[1])) { /* net mask follows: */
char *tmp;
++addr;
bits = strtol(addr, &tmp, 0);
if (tmp == addr) /* expected a digit, found something else */
return 0;
addr = tmp;
if (bits < 0 || bits > 32) /* netmask must be between 0 and 32 */
return 0;
}
else {
/* Determine (i.e., "guess") netmask by counting the */
/* number of trailing .0's; reduce #quads appropriately */
/* (so that 192.168.0.0 is equivalent to 192.168.) */
while (quads > 0 && ip_addr[quads - 1] == 0)
--quads;
/* "IP Address should be given in dotted-quad form, optionally followed by a netmask (e.g., 192.168.111.0/24)"; */
if (quads < 1)
return 0;
/* every zero-byte counts as 8 zero-bits */
bits = 8 * quads;
if (bits != 32) /* no warning for fully qualified IP address */
fprintf(stderr, "Warning: NetMask not supplied with IP-Addr; guessing: %s/%ld\n",
inet_ntoa(This->addr), bits);
}
This->mask.s_addr = htonl(INADDR_NONE << (32 - bits));
if (*addr == '\0' && (This->addr.s_addr & ~This->mask.s_addr) != 0) {
fprintf(stderr, "Warning: NetMask and IP-Addr disagree in %s/%ld\n",
inet_ntoa(This->addr), bits);
This->addr.s_addr &= This->mask.s_addr;
fprintf(stderr, " Set to %s/%ld\n",
inet_ntoa(This->addr), bits);
}
if (*addr == '\0') {
This->matcher = proxy_match_ipaddr;
return 1;
}
else
return (*addr == '\0'); /* okay iff we've parsed the whole string */
}
/* Return TRUE if addr represents an IP address (or an IP network address) */
static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r)
{
int i;
int ip_addr[4];
struct in_addr addr;
struct in_addr *ip_list;
char **ip_listptr;
const char *found;
const char *host = proxy_get_host_of_request(r);
if (host == NULL) /* oops! */
return 0;
memset(&addr, '\0', sizeof addr);
memset(ip_addr, '\0', sizeof ip_addr);
if (4 == sscanf(host, "%d.%d.%d.%d", &ip_addr[0], &ip_addr[1], &ip_addr[2], &ip_addr[3])) {
for (addr.s_addr = 0, i = 0; i < 4; ++i)
addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i));
if (This->addr.s_addr == (addr.s_addr & This->mask.s_addr)) {
#if DEBUGGING
fprintf(stderr, "1)IP-Match: %s[%s] <-> ", host, inet_ntoa(addr));
fprintf(stderr, "%s/", inet_ntoa(This->addr));
fprintf(stderr, "%s\n", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
fprintf(stderr, "1)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(addr));
fprintf(stderr, "%s/", inet_ntoa(This->addr));
fprintf(stderr, "%s\n", inet_ntoa(This->mask));
}
#endif
}
else {
struct hostent the_host;
memset(&the_host, '\0', sizeof the_host);
found = ap_proxy_host2addr(host, &the_host);
if (found != NULL) {
#if DEBUGGING
fprintf(stderr, "2)IP-NoMatch: hostname=%s msg=%s\n", host, found);
#endif
return 0;
}
if (the_host.h_name != NULL)
found = the_host.h_name;
else
found = host;
/* Try to deal with multiple IP addr's for a host */
for (ip_listptr = the_host.h_addr_list; *ip_listptr; ++ip_listptr) {
ip_list = (struct in_addr *) *ip_listptr;
if (This->addr.s_addr == (ip_list->s_addr & This->mask.s_addr)) {
#if DEBUGGING
fprintf(stderr, "3)IP-Match: %s[%s] <-> ", found, inet_ntoa(*ip_list));
fprintf(stderr, "%s/", inet_ntoa(This->addr));
fprintf(stderr, "%s\n", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
fprintf(stderr, "3)IP-NoMatch: %s[%s] <-> ", found, inet_ntoa(*ip_list));
fprintf(stderr, "%s/", inet_ntoa(This->addr));
fprintf(stderr, "%s\n", inet_ntoa(This->mask));
}
#endif
}
}
return 0;
}
/* Return TRUE if addr represents a domain name */
int ap_proxy_is_domainname(struct dirconn_entry *This, pool *p)
{
char *addr = This->name;
int i;
/* Domain name must start with a '.' */
if (addr[0] != '.')
return 0;
/* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
for (i = 0; ap_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i)
continue;
#if 0
if (addr[i] == ':') {
fprintf(stderr, "@@@@ handle optional port in proxy_is_domainname()\n");
/* @@@@ handle optional port */
}
#endif
if (addr[i] != '\0')
return 0;
/* Strip trailing dots */
for (i = strlen(addr) - 1; i > 0 && addr[i] == '.'; --i)
addr[i] = '\0';
This->matcher = proxy_match_domainname;
return 1;
}
/* Return TRUE if host "host" is in domain "domain" */
static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r)
{
const char *host = proxy_get_host_of_request(r);
int d_len = strlen(This->name), h_len;
if (host == NULL) /* some error was logged already */
return 0;
h_len = strlen(host);
/* @@@ do this within the setup? */
/* Ignore trailing dots in domain comparison: */
while (d_len > 0 && This->name[d_len - 1] == '.')
--d_len;
while (h_len > 0 && host[h_len - 1] == '.')
--h_len;
return h_len > d_len
&& strncasecmp(&host[h_len - d_len], This->name, d_len) == 0;
}
/* Return TRUE if addr represents a host name */
int ap_proxy_is_hostname(struct dirconn_entry *This, pool *p)
{
struct hostent host;
char *addr = This->name;
int i;
/* Host names must not start with a '.' */
if (addr[0] == '.')
return 0;
/* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
for (i = 0; ap_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i);
#if 0
if (addr[i] == ':') {
fprintf(stderr, "@@@@ handle optional port in proxy_is_hostname()\n");
/* @@@@ handle optional port */
}
#endif
if (addr[i] != '\0' || ap_proxy_host2addr(addr, &host) != NULL)
return 0;
This->hostentry = ap_pduphostent (p, &host);
/* Strip trailing dots */
for (i = strlen(addr) - 1; i > 0 && addr[i] == '.'; --i)
addr[i] = '\0';
This->matcher = proxy_match_hostname;
return 1;
}
/* Return TRUE if host "host" is equal to host2 "host2" */
static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r)
{
char *host = This->name;
const char *host2 = proxy_get_host_of_request(r);
int h2_len;
int h1_len;
if (host == NULL || host2 == NULL)
return 0; /* oops! */
h2_len = strlen(host2);
h1_len = strlen(host);
#if 0
unsigned long *ip_list;
/* Try to deal with multiple IP addr's for a host */
for (ip_list = *This->hostentry->h_addr_list; *ip_list != 0UL; ++ip_list)
if (*ip_list == ? ? ? ? ? ? ? ? ? ? ? ? ?)
return 1;
#endif
/* Ignore trailing dots in host2 comparison: */
while (h2_len > 0 && host2[h2_len - 1] == '.')
--h2_len;
while (h1_len > 0 && host[h1_len - 1] == '.')
--h1_len;
return h1_len == h2_len
&& strncasecmp(host, host2, h1_len) == 0;
}
/* Return TRUE if addr is to be matched as a word */
int ap_proxy_is_word(struct dirconn_entry *This, pool *p)
{
This->matcher = proxy_match_word;
return 1;
}
/* Return TRUE if string "str2" occurs literally in "str1" */
static int proxy_match_word(struct dirconn_entry *This, request_rec *r)
{
const char *host = proxy_get_host_of_request(r);
return host != NULL && strstr(host, This->name) != NULL;
}
int ap_proxy_doconnect(int sock, struct sockaddr_in *addr, request_rec *r)
{
int i;
ap_hard_timeout("proxy connect", r);
do {
i = connect(sock, (struct sockaddr *) addr, sizeof(struct sockaddr_in));
#ifdef WIN32
if (i == SOCKET_ERROR)
errno = WSAGetLastError();
#endif /* WIN32 */
} while (i == -1 && errno == EINTR);
if (i == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"proxy connect to %s port %d failed",
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
ap_kill_timeout(r);
return i;
}
/* This function is called by ap_table_do() for all header lines */
/* (from proxy_http.c and proxy_ftp.c) */
/* It is passed a table_do_args struct pointer and a MIME field and value pair */
int ap_proxy_send_hdr_line(void *p, const char *key, const char *value)
{
struct tbl_do_args *parm = (struct tbl_do_args *)p;
if (key == NULL || value == NULL || value[0] == '\0')
return 1;
if (!parm->req->assbackwards)
ap_rvputs(parm->req, key, ": ", value, CRLF, NULL);
if (parm->cache != NULL && parm->cache->fp != NULL &&
ap_bvputs(parm->cache->fp, key, ": ", value, CRLF, NULL) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, parm->cache->req,
"proxy: error writing header to %s", parm->cache->tempfile);
parm->cache = ap_proxy_cache_error(parm->cache);
}
return 1; /* tell ap_table_do() to continue calling us for more headers */
}
/* send a text line to one or two BUFF's; return line length */
unsigned ap_proxy_bputs2(const char *data, BUFF *client, cache_req *cache)
{
unsigned len = ap_bputs(data, client);
if (cache != NULL && cache->fp != NULL)
ap_bputs(data, cache->fp);
return len;
}
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