proxy_util.c revision bb859fec493f440dde2259c20b002428fd0b8b55
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher/* Copyright 1999-2004 The Apache Software Foundation
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher *
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * Licensed under the Apache License, Version 2.0 (the "License");
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * you may not use this file except in compliance with the License.
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * You may obtain a copy of the License at
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher *
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * http://www.apache.org/licenses/LICENSE-2.0
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher *
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * Unless required by applicable law or agreed to in writing, software
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * distributed under the License is distributed on an "AS IS" BASIS,
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * See the License for the specific language governing permissions and
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher * limitations under the License.
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher */
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher/* Utility routines for Apache proxy */
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#include "mod_proxy.h"
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#include "ap_mpm.h"
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#include "apr_version.h"
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#if (APR_MAJOR_VERSION < 1)
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#undef apr_socket_create
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#define apr_socket_create apr_socket_create_ex
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher#endif
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagherstatic int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r);
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagherstatic int proxy_match_domainname(struct dirconn_entry *This, request_rec *r);
291a6c8af9759e41cec6f332cb72606ca90768c3Pavel Březinastatic int proxy_match_hostname(struct dirconn_entry *This, request_rec *r);
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagherstatic int proxy_match_word(struct dirconn_entry *This, request_rec *r);
65e8f538ad35ba7d86cd9e60a3d86aec34537027Stephen Gallagher
APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, create_req,
(request_rec *r, request_rec *pr), (r, pr),
OK, DECLINED)
/* already called in the knowledge that the characters are hex digits */
PROXY_DECLARE(int) ap_proxy_hex2c(const char *x)
{
int i, ch;
#if !APR_CHARSET_EBCDIC
ch = x[0];
if (apr_isdigit(ch))
i = ch - '0';
else if (apr_isupper(ch))
i = ch - ('A' - 10);
else
i = ch - ('a' - 10);
i <<= 4;
ch = x[1];
if (apr_isdigit(ch))
i += ch - '0';
else if (apr_isupper(ch))
i += ch - ('A' - 10);
else
i += ch - ('a' - 10);
return i;
#else /*APR_CHARSET_EBCDIC*/
/* we assume that the hex value refers to an ASCII character
* so convert to EBCDIC so that it makes sense locally;
*
* example:
*
* client specifies %20 in URL to refer to a space char;
* at this point we're called with EBCDIC "20"; after turning
* EBCDIC "20" into binary 0x20, we then need to assume that 0x20
* represents an ASCII char and convert 0x20 to EBCDIC, yielding
* 0x40
*/
char buf[1];
if (1 == sscanf(x, "%2x", &i)) {
buf[0] = i & 0xFF;
ap_xlate_proto_from_ascii(buf, 1);
return buf[0];
}
else {
return 0;
}
#endif /*APR_CHARSET_EBCDIC*/
}
PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x)
{
#if !APR_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 /*APR_CHARSET_EBCDIC*/
static const char ntoa[] = { "0123456789ABCDEF" };
char buf[1];
ch &= 0xFF;
buf[0] = ch;
ap_xlate_proto_to_ascii(buf, 1);
x[0] = '%';
x[1] = ntoa[(buf[0] >> 4) & 0x0F];
x[2] = ntoa[buf[0] & 0x0F];
x[3] = '\0';
#endif /*APR_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.
*/
PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, enum enctype t,
int isenc)
{
int i, j, ch;
char *y;
char *allowed; /* characters which should not be encoded */
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 = apr_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 (!apr_isxdigit(x[i + 1]) || !apr_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 (!apr_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.
*/
PROXY_DECLARE(char *)
ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp,
char **passwordp, char **hostp, apr_port_t *port)
{
char *addr, *scope_id, *strp, *host, *url = *urlp;
char *user = NULL, *password = NULL;
apr_port_t tmp_port;
apr_status_t rv;
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;
}
/* Parse the host string to separate host portion from optional port.
* Perform range checking on port.
*/
rv = apr_parse_addr_port(&addr, &scope_id, &tmp_port, host, p);
if (rv != APR_SUCCESS || addr == NULL || scope_id != NULL) {
return "Invalid host/port";
}
if (tmp_port != 0) { /* only update caller's port if port was specified */
*port = tmp_port;
}
ap_str_tolower(addr); /* DNS names are case-insensitive */
*urlp = url;
*hostp = addr;
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.
*/
PROXY_DECLARE(const char *)
ap_proxy_date_canon(apr_pool_t *p, const char *x1)
{
char *x = apr_pstrdup(p, x1);
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, apr_day_snames[wk]) == 0)
break;
if (wk == 7)
return x;
}
/* check date */
for (mon = 0; mon < 12; mon++)
if (strcmp(month, apr_month_snames[mon]) == 0)
break;
if (mon == 12)
return x;
q = apr_palloc(p, 30);
apr_snprintf(q, 30, "%s, %.2d %s %d %.2d:%.2d:%.2d GMT", apr_day_snames[wk],
mday, apr_month_snames[mon], year, hour, min, sec);
return q;
}
PROXY_DECLARE(request_rec *)ap_proxy_make_fake_req(conn_rec *c, request_rec *r)
{
request_rec *rp = apr_pcalloc(c->pool, sizeof(*r));
rp->pool = c->pool;
rp->status = HTTP_OK;
rp->headers_in = apr_table_make(c->pool, 50);
rp->subprocess_env = apr_table_make(c->pool, 50);
rp->headers_out = apr_table_make(c->pool, 12);
rp->err_headers_out = apr_table_make(c->pool, 5);
rp->notes = apr_table_make(c->pool, 5);
rp->server = r->server;
rp->proxyreq = r->proxyreq;
rp->request_time = r->request_time;
rp->connection = c;
rp->output_filters = c->output_filters;
rp->input_filters = c->input_filters;
rp->proto_output_filters = c->output_filters;
rp->proto_input_filters = c->input_filters;
rp->request_config = ap_create_request_config(c->pool);
proxy_run_create_req(r, rp);
return rp;
}
/*
* 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.
*/
PROXY_DECLARE(int) ap_proxy_liststr(const char *list, const char *val)
{
int len, i;
const char *p;
len = strlen(val);
while (list != NULL) {
p = ap_strchr_c(list, ',');
if (p != NULL) {
i = p - list;
do
p++;
while (apr_isspace(*p));
}
else
i = strlen(list);
while (i > 0 && apr_isspace(list[i - 1]))
i--;
if (i == len && strncasecmp(list, val, len) == 0)
return 1;
list = p;
}
return 0;
}
/*
* list is a comma-separated list of case-insensitive tokens, with
* optional whitespace around the tokens.
* if val appears on the list of tokens, it is removed from the list,
* and the new list is returned.
*/
PROXY_DECLARE(char *)ap_proxy_removestr(apr_pool_t *pool, const char *list, const char *val)
{
int len, i;
const char *p;
char *new = NULL;
len = strlen(val);
while (list != NULL) {
p = ap_strchr_c(list, ',');
if (p != NULL) {
i = p - list;
do
p++;
while (apr_isspace(*p));
}
else
i = strlen(list);
while (i > 0 && apr_isspace(list[i - 1]))
i--;
if (i == len && strncasecmp(list, val, len) == 0) {
/* do nothing */
}
else {
if (new)
new = apr_pstrcat(pool, new, ",", apr_pstrndup(pool, list, i), NULL);
else
new = apr_pstrndup(pool, list, i);
}
list = p;
}
return new;
}
/*
* Converts 8 hex digits to a time integer
*/
PROXY_DECLARE(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 (apr_isdigit(ch))
j |= ch - '0';
else if (apr_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
*/
PROXY_DECLARE(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';
}
PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message)
{
apr_table_setn(r->notes, "error-notes",
apr_pstrcat(r->pool,
"The proxy server could not handle the request "
"<em><a href=\"", ap_escape_uri(r->pool, r->uri),
"\">", ap_escape_html(r->pool, r->method),
"&nbsp;",
ap_escape_html(r->pool, r->uri), "</a></em>.<p>\n"
"Reason: <strong>",
ap_escape_html(r->pool, message),
"</strong></p>", NULL));
/* Allow "error-notes" string to be printed by ap_send_error_response() */
apr_table_setn(r->notes, "verbose-error-to", apr_pstrdup(r->pool, "*"));
r->status_line = apr_psprintf(r->pool, "%3.3u Proxy Error", statuscode);
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"proxy: %s returned by %s", message, r->uri);
return statuscode;
}
static const char *
proxy_get_host_of_request(request_rec *r)
{
char *url, *user = NULL, *password = NULL, *err, *host;
apr_port_t port;
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 = apr_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, 0, 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) */
PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *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 apr_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 (!apr_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] == '/' && apr_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 */
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"Warning: NetMask not supplied with IP-Addr; guessing: %s/%ld\n",
inet_ntoa(This->addr), bits);
}
This->mask.s_addr = htonl(APR_INADDR_NONE << (32 - bits));
if (*addr == '\0' && (This->addr.s_addr & ~This->mask.s_addr) != 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"Warning: NetMask and IP-Addr disagree in %s/%ld\n",
inet_ntoa(This->addr), bits);
This->addr.s_addr &= This->mask.s_addr;
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
" 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, ip_addr[4];
struct in_addr addr, *ip;
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
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"1)IP-Match: %s[%s] <-> ", host, inet_ntoa(addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"1)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s", inet_ntoa(This->mask));
}
#endif
}
else {
struct apr_sockaddr_t *reqaddr;
if (apr_sockaddr_info_get(&reqaddr, host, APR_UNSPEC, 0, 0, r->pool)
!= APR_SUCCESS) {
#if DEBUGGING
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"2)IP-NoMatch: hostname=%s msg=Host not found",
host);
#endif
return 0;
}
/* Try to deal with multiple IP addr's for a host */
/* FIXME: This needs to be able to deal with IPv6 */
while (reqaddr) {
ip = (struct in_addr *) reqaddr->ipaddr_ptr;
if (This->addr.s_addr == (ip->s_addr & This->mask.s_addr)) {
#if DEBUGGING
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"3)IP-Match: %s[%s] <-> ", host,
inet_ntoa(*ip));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s", inet_ntoa(This->mask));
#endif
return 1;
}
#if DEBUGGING
else {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"3)IP-NoMatch: %s[%s] <-> ", host,
inet_ntoa(*ip));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s/", inet_ntoa(This->addr));
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"%s", inet_ntoa(This->mask));
}
#endif
reqaddr = reqaddr->next;
}
}
return 0;
}
/* Return TRUE if addr represents a domain name */
PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *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; apr_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i)
continue;
#if 0
if (addr[i] == ':') {
ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
"@@@@ handle optional port in proxy_is_domainname()");
/* @@@@ 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 host represents a host name */
PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p)
{
struct apr_sockaddr_t *addr;
char *host = This->name;
int i;
/* Host names must not start with a '.' */
if (host[0] == '.')
return 0;
/* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */
for (i = 0; apr_isalnum(host[i]) || host[i] == '-' || host[i] == '.'; ++i);
if (host[i] != '\0' || apr_sockaddr_info_get(&addr, host, APR_UNSPEC, 0, 0, p) != APR_SUCCESS)
return 0;
This->hostaddr = addr;
/* Strip trailing dots */
for (i = strlen(host) - 1; i > 0 && host[i] == '.'; --i)
host[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
struct apr_sockaddr_t *addr = *This->hostaddr;
/* Try to deal with multiple IP addr's for a host */
while (addr) {
if (addr->ipaddr_ptr == ? ? ? ? ? ? ? ? ? ? ? ? ?)
return 1;
addr = addr->next;
}
#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 */
PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *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 && ap_strstr_c(host, This->name) != NULL;
}
/* checks whether a host in uri_addr matches proxyblock */
PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf,
apr_sockaddr_t *uri_addr)
{
int j;
apr_sockaddr_t * src_uri_addr = uri_addr;
/* XXX FIXME: conf->noproxies->elts is part of an opaque structure */
for (j = 0; j < conf->noproxies->nelts; j++) {
struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts;
struct apr_sockaddr_t *conf_addr = npent[j].addr;
uri_addr = src_uri_addr;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
"proxy: checking remote machine [%s] against [%s]", uri_addr->hostname, npent[j].name);
if ((npent[j].name && ap_strstr_c(uri_addr->hostname, npent[j].name))
|| npent[j].name[0] == '*') {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
"proxy: connect to remote machine %s blocked: name %s matched", uri_addr->hostname, npent[j].name);
return HTTP_FORBIDDEN;
}
while (conf_addr) {
while (uri_addr) {
char *conf_ip;
char *uri_ip;
apr_sockaddr_ip_get(&conf_ip, conf_addr);
apr_sockaddr_ip_get(&uri_ip, uri_addr);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
"proxy: ProxyBlock comparing %s and %s", conf_ip, uri_ip);
if (!apr_strnatcasecmp(conf_ip, uri_ip)) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
"proxy: connect to remote machine %s blocked: IP %s matched", uri_addr->hostname, conf_ip);
return HTTP_FORBIDDEN;
}
uri_addr = uri_addr->next;
}
conf_addr = conf_addr->next;
}
}
return OK;
}
/* set up the minimal filter set */
PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r)
{
ap_add_input_filter("HTTP_IN", NULL, r, c);
return OK;
}
/* converts a series of buckets into a string
* XXX: BillS says this function performs essentially the same function as
* ap_rgetline() in protocol.c. Deprecate this function and use ap_rgetline()
* instead? I think ap_proxy_string_read() will not work properly on non ASCII
* (EBCDIC) machines either.
*/
PROXY_DECLARE(apr_status_t) ap_proxy_string_read(conn_rec *c, apr_bucket_brigade *bb,
char *buff, apr_size_t bufflen, int *eos)
{
apr_bucket *e;
apr_status_t rv;
char *pos = buff;
char *response;
int found = 0;
apr_size_t len;
/* start with an empty string */
buff[0] = 0;
*eos = 0;
/* loop through each brigade */
while (!found) {
/* get brigade from network one line at a time */
if (APR_SUCCESS != (rv = ap_get_brigade(c->input_filters, bb,
AP_MODE_GETLINE,
APR_BLOCK_READ,
0))) {
return rv;
}
/* loop through each bucket */
while (!found) {
if (*eos || APR_BRIGADE_EMPTY(bb)) {
/* The connection aborted or timed out */
return APR_ECONNABORTED;
}
e = APR_BRIGADE_FIRST(bb);
if (APR_BUCKET_IS_EOS(e)) {
*eos = 1;
}
else {
if (APR_SUCCESS != apr_bucket_read(e, (const char **)&response, &len, APR_BLOCK_READ)) {
return rv;
}
/* is string LF terminated?
* XXX: This check can be made more efficient by simply checking
* if the last character in the 'response' buffer is an ASCII_LF.
* See ap_rgetline() for an example.
*/
if (memchr(response, APR_ASCII_LF, len)) {
found = 1;
}
/* concat strings until buff is full - then throw the data away */
if (len > ((bufflen-1)-(pos-buff))) {
len = (bufflen-1)-(pos-buff);
}
if (len > 0) {
pos = apr_cpystrn(pos, response, len);
}
}
APR_BUCKET_REMOVE(e);
apr_bucket_destroy(e);
}
}
return APR_SUCCESS;
}
/* unmerge an element in the table */
PROXY_DECLARE(void) ap_proxy_table_unmerge(apr_pool_t *p, apr_table_t *t, char *key)
{
apr_off_t offset = 0;
apr_off_t count = 0;
char *value = NULL;
/* get the value to unmerge */
const char *initial = apr_table_get(t, key);
if (!initial) {
return;
}
value = apr_pstrdup(p, initial);
/* remove the value from the headers */
apr_table_unset(t, key);
/* find each comma */
while (value[count]) {
if (value[count] == ',') {
value[count] = 0;
apr_table_add(t, key, value + offset);
offset = count + 1;
}
count++;
}
apr_table_add(t, key, value + offset);
}
PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p,
proxy_server_conf *conf,
const char *url)
{
proxy_balancer *balancer;
char *c, *uri = apr_pstrdup(p, url);
int i;
c = strchr(url, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
return NULL;
/* remove path from uri */
if ((c = strchr(c + 3, '/')))
*c = '\0';
balancer = (proxy_balancer *)conf->balancers->elts;
for (i = 0; i < conf->balancers->nelts; i++) {
if (strcasecmp(balancer->name, uri) == 0)
return balancer;
balancer++;
}
return NULL;
}
PROXY_DECLARE(const char *) ap_proxy_add_balancer(proxy_balancer **balancer,
apr_pool_t *p,
proxy_server_conf *conf,
const char *url)
{
char *c, *q, *uri = apr_pstrdup(p, url);
int port;
apr_status_t rc = 0;
c = strchr(url, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
return "Bad syntax for a remote proxy server";
/* remove path from uri */
if ((q = strchr(c + 3, '/')))
*q = '\0';
q = strchr(c + 3, ':');
if (q != NULL) {
if (sscanf(q + 1, "%u", &port) != 1 || port > 65535) {
return "Bad syntax for a remote proxy server (bad port number)";
}
*q = '\0';
}
else
port = -1;
ap_str_tolower(uri);
*balancer = apr_array_push(conf->balancers);
(*balancer)->name = apr_pstrdup(p, uri);
*c = '\0';
(*balancer)->workers = apr_array_make(p, 5, sizeof(proxy_runtime_worker));
/* XXX Is this a right place to create mutex */
#if APR_HAS_THREADS
if ((rc = apr_thread_mutex_create(&((*balancer)->mutex),
APR_THREAD_MUTEX_DEFAULT, p)) != APR_SUCCESS) {
/* XXX: Do we need to log something here */
return "can not create thread mutex";
}
#endif
return NULL;
}
PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p,
proxy_server_conf *conf,
const char *url)
{
proxy_worker *worker;
char *c, *uri = apr_pstrdup(p, url);
int i;
c = strchr(url, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
return NULL;
/* remove path from uri */
if ((c = strchr(c + 3, '/')))
*c = '\0';
worker = (proxy_worker *)conf->workers->elts;
for (i = 0; i < conf->workers->nelts; i++) {
if (strcasecmp(worker->name, uri) == 0)
return worker;
worker++;
}
return NULL;
}
static void init_conn_pool(apr_pool_t *p, proxy_worker *worker)
{
apr_pool_t *pool;
proxy_conn_pool *cp;
/* Create a connection pool's subpool.
* This pool is used for connection recycling.
* Once the worker is added it is never removed but
* it can be disabled.
*/
apr_pool_create(&pool, p);
/* Alloc from the same pool as worker.
* proxy_conn_pool is permanently attached to the worker.
*/
cp = (proxy_conn_pool *)apr_pcalloc(p, sizeof(proxy_conn_pool));
cp->pool = pool;
#if APR_HAS_THREADS
{
int mpm_threads;
ap_mpm_query(AP_MPMQ_MAX_THREADS, &mpm_threads);
if (mpm_threads > 1) {
/* Set hard max to no more then mpm_threads */
if (worker->hmax == 0 || worker->hmax > mpm_threads)
worker->hmax = mpm_threads;
if (worker->smax == 0 || worker->smax > worker->hmax)
worker->smax = worker->hmax;
/* Set min to be lower then smax */
if (worker->min > worker->smax)
worker->min = worker->smax;
}
else {
/* This will supress the apr_reslist creation */
worker->min = worker->smax = worker->hmax = 0;
}
}
#endif
worker->cp = cp;
}
PROXY_DECLARE(const char *) ap_proxy_add_worker(proxy_worker **worker,
apr_pool_t *p,
proxy_server_conf *conf,
const char *url)
{
char *c, *q, *uri = apr_pstrdup(p, url);
int port;
c = strchr(uri, ':');
if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0')
return "Bad syntax for a remote proxy server";
/* remove path from uri */
if ((q = strchr(c + 3, '/')))
*q = '\0';
q = strchr(c + 3, ':');
if (q != NULL) {
if (sscanf(q + 1, "%u", &port) != 1 || port > 65535) {
return "Bad syntax for a remote proxy server (bad port number)";
}
*q = '\0';
}
else
port = -1;
ap_str_tolower(uri);
*worker = apr_array_push(conf->workers);
(*worker)->name = apr_pstrdup(p, url);
*c = '\0';
(*worker)->scheme = uri;
if (port == -1)
port = apr_uri_port_of_scheme((*worker)->scheme);
(*worker)->port = port;
init_conn_pool(p, *worker);
return NULL;
}
PROXY_DECLARE(void)
ap_proxy_add_worker_to_balancer(proxy_balancer *balancer, proxy_worker *worker)
{
int i;
double median, ffactor = 0.0;
proxy_runtime_worker *runtime, *workers;
runtime = apr_array_push(balancer->workers);
runtime->w = worker;
/* Recalculate lbfactors */
workers = (proxy_runtime_worker *)balancer->workers->elts;
for (i = 0; i < balancer->workers->nelts; i++) {
/* Set to the original configuration */
workers[i].lbfactor = workers[i].w->lbfactor;
ffactor += workers[i].lbfactor;
}
if (ffactor < 100.0) {
int z = 0;
for (i = 0; i < balancer->workers->nelts; i++) {
if (workers[i].lbfactor == 0.0)
++z;
}
if (z) {
median = (100.0 - ffactor) / z;
for (i = 0; i < balancer->workers->nelts; i++) {
if (workers[i].lbfactor == 0.0)
workers[i].lbfactor = median;
}
}
else {
median = (100.0 - ffactor) / balancer->workers->nelts;
for (i = 0; i < balancer->workers->nelts; i++)
workers[i].lbfactor += median;
}
}
else if (ffactor > 100.0) {
median = (ffactor - 100.0) / balancer->workers->nelts;
for (i = 0; i < balancer->workers->nelts; i++) {
if (workers[i].lbfactor > median)
workers[i].lbfactor -= median;
}
}
}
PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker,
proxy_balancer **balancer,
request_rec *r,
proxy_server_conf *conf, char **url)
{
int access_status;
access_status = proxy_run_pre_request(worker, balancer, r, conf, url);
if (access_status == DECLINED && *balancer == NULL) {
*worker = ap_proxy_get_worker(r->pool, conf, *url);
if (*worker) {
*balancer = NULL;
access_status = OK;
}
else
access_status = DECLINED;
}
else if (access_status == DECLINED && balancer != NULL) {
/* All the workers are busy */
access_status = HTTP_SERVICE_UNAVAILABLE;
}
return access_status;
}
PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker,
proxy_balancer *balancer,
request_rec *r,
proxy_server_conf *conf)
{
int access_status;
if (balancer)
access_status = proxy_run_post_request(worker, balancer, r, conf);
else {
access_status = OK;
}
return access_status;
}
/* DEPRECATED */
PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **newsock,
const char *proxy_function,
apr_sockaddr_t *backend_addr,
const char *backend_name,
proxy_server_conf *conf,
server_rec *s,
apr_pool_t *p)
{
apr_status_t rv;
int connected = 0;
int loglevel;
while (backend_addr && !connected) {
if ((rv = apr_socket_create(newsock, backend_addr->family,
SOCK_STREAM, 0, p)) != APR_SUCCESS) {
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s,
"proxy: %s: error creating fam %d socket for target %s",
proxy_function,
backend_addr->family,
backend_name);
/* this could be an IPv6 address from the DNS but the
* local machine won't give us an IPv6 socket; hopefully the
* DNS returned an additional address to try
*/
backend_addr = backend_addr->next;
continue;
}
#if !defined(TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0 &&
(rv = apr_socket_opt_set(*newsock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_socket_opt_set(SO_RCVBUF): Failed to set "
"ProxyReceiveBufferSize, using default");
}
#endif
/* Set a timeout on the socket */
if (conf->timeout_set == 1) {
apr_socket_timeout_set(*newsock, conf->timeout);
}
else {
apr_socket_timeout_set(*newsock, s->timeout);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
"proxy: %s: fam %d socket created to connect to %s",
proxy_function, backend_addr->family, backend_name);
/* make the connection out of the socket */
rv = apr_socket_connect(*newsock, backend_addr);
/* if an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
apr_socket_close(*newsock);
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s,
"proxy: %s: attempt to connect to %pI (%s) failed",
proxy_function,
backend_addr,
backend_name);
backend_addr = backend_addr->next;
continue;
}
connected = 1;
}
return connected ? 0 : 1;
}
static apr_status_t proxy_conn_cleanup(void *theconn)
{
proxy_conn_rec *conn = (proxy_conn_rec *)theconn;
/* Close the socket */
if (conn->sock)
apr_socket_close(conn->sock);
conn->sock = NULL;
return APR_SUCCESS;
}
/* reslist constructor */
static apr_status_t connection_constructor(void **resource, void *params,
apr_pool_t *pool)
{
apr_pool_t *ctx;
proxy_conn_rec *conn;
server_rec *s = (server_rec *)params;
/* Create the subpool for each connection
* This keeps the memory consumption constant
* when disconnecting from backend.
*/
apr_pool_create(&ctx, pool);
conn = apr_pcalloc(ctx, sizeof(proxy_conn_rec));
conn->pool = ctx;
*resource = conn;
/* register the pool cleanup */
apr_pool_cleanup_register(ctx, (void *)conn,
proxy_conn_cleanup, apr_pool_cleanup_null);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
"proxy: socket is constructed");
return APR_SUCCESS;
}
/* reslist destructor */
static apr_status_t connection_destructor(void *resource, void *params,
apr_pool_t *pool)
{
proxy_conn_rec *conn = (proxy_conn_rec *)resource;
server_rec *s = (server_rec *)params;
apr_pool_destroy(conn->pool);
if (s != NULL)
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
"proxy: socket is destructed");
return APR_SUCCESS;
}
/* Destroy the connection */
PROXY_DECLARE(apr_status_t) ap_proxy_destroy_connection(proxy_conn_rec *conn)
{
return connection_destructor(conn, NULL, NULL);
}
/* Destroy the connection */
PROXY_DECLARE(apr_status_t) ap_proxy_close_connection(proxy_conn_rec *conn)
{
apr_status_t rv = APR_EOF;
/* Close the socket */
if (conn->sock)
rv = apr_socket_close(conn->sock);
conn->sock = NULL;
return rv;
}
/* low level connection acquire/release functions
* they are hiding apr_reslist for nothreaded or prefork servers.
*/
static apr_status_t acquire_connection_low(proxy_conn_rec **conn, proxy_worker *worker)
{
apr_status_t rv;
#if APR_HAS_THREADS
if (worker->hmax) {
rv = apr_reslist_acquire(worker->cp->res, (void **)conn);
}
else
#endif
{
*conn = worker->cp->conn;
worker->cp->conn = NULL;
rv = APR_SUCCESS;
}
return rv;
}
static apr_status_t release_connection_low(proxy_conn_rec *conn, proxy_worker *worker)
{
apr_status_t rv = APR_SUCCESS;
#if APR_HAS_THREADS
if (worker->hmax) {
rv = apr_reslist_release(worker->cp->res, (void *)conn);
}
else
#endif
{
worker->cp->conn = conn;
}
return rv;
}
static apr_status_t init_conn_worker(proxy_worker *worker, server_rec *s)
{
apr_status_t rv;
#if APR_HAS_THREADS
if (worker->hmax) {
rv = apr_reslist_create(&(worker->cp->res),
worker->min, worker->smax,
worker->hmax, worker->ttl,
connection_constructor, connection_destructor,
s, worker->cp->pool);
#if (APR_MAJOR_VERSION > 0)
/* Set the acquire timeout */
if (rv == APR_SUCCESS && worker->acquire_set)
apr_reslist_timeout_set(worker->cp->res, worker->acquire);
#endif
}
else
#endif
{
connection_constructor((void **)&(worker->cp->conn), s, worker->cp->pool);
rv = APR_SUCCESS;
}
return rv;
}
PROXY_DECLARE(apr_status_t)
ap_proxy_determine_connection(apr_pool_t *p, request_rec *r,
proxy_server_conf *conf,
proxy_worker *worker,
proxy_conn_rec *conn,
apr_pool_t *ppool,
apr_uri_t *uri,
char **url,
const char *proxyname,
apr_port_t proxyport,
char *server_portstr,
int server_portstr_size)
{
int server_port;
apr_status_t err = APR_SUCCESS;
/*
* Break up the URL to determine the host to connect to
*/
/* we break the URL into host, port, uri */
if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) {
return ap_proxyerror(r, HTTP_BAD_REQUEST,
apr_pstrcat(p,"URI cannot be parsed: ", *url,
NULL));
}
if (!uri->port) {
uri->port = apr_uri_port_of_scheme(uri->scheme);
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
"proxy: HTTP connecting %s to %s:%d", *url, uri->hostname,
uri->port);
/* allocate these out of the specified connection pool
* The scheme handler decides if this is permanent or
* short living pool.
*/
/* are we connecting directly, or via a proxy? */
if (proxyname) {
conn->hostname = apr_pstrdup(ppool, proxyname);
conn->port = proxyport;
} else {
conn->hostname = apr_pstrdup(ppool, uri->hostname);
conn->port = uri->port;
*url = apr_pstrcat(p, uri->path, uri->query ? "?" : "",
uri->query ? uri->query : "",
uri->fragment ? "#" : "",
uri->fragment ? uri->fragment : "", NULL);
}
/* Worker can have the single constant backend adress.
* The single DNS lookup is used once per worker.
* If dynamic change is needed then set the addr to NULL
* inside dynamic config to force the lookup.
*/
if (!worker->cp->addr)
err = apr_sockaddr_info_get(&(worker->cp->addr),
conn->hostname, APR_UNSPEC,
conn->port, 0,
worker->cp->pool);
if (err != APR_SUCCESS) {
return ap_proxyerror(r, HTTP_BAD_GATEWAY,
apr_pstrcat(p, "DNS lookup failure for: ",
conn->hostname, NULL));
}
/* Get the server port for the Via headers */
{
server_port = ap_get_server_port(r);
if (ap_is_default_port(server_port, r)) {
strcpy(server_portstr,"");
} else {
apr_snprintf(server_portstr, server_portstr_size, ":%d",
server_port);
}
}
/* check if ProxyBlock directive on this host */
if (OK != ap_proxy_checkproxyblock(r, conf, worker->cp->addr)) {
return ap_proxyerror(r, HTTP_FORBIDDEN,
"Connect to remote machine blocked");
}
return OK;
}
static int is_socket_connected(apr_socket_t *sock)
{
apr_size_t buffer_len = 1;
char test_buffer[1];
apr_status_t socket_status;
apr_interval_time_t current_timeout;
/* save timeout */
apr_socket_timeout_get(sock, &current_timeout);
/* set no timeout */
apr_socket_timeout_set(sock, 0);
socket_status = apr_socket_recv(sock, test_buffer, &buffer_len);
/* put back old timeout */
apr_socket_timeout_set(sock, current_timeout);
if (APR_STATUS_IS_EOF(socket_status))
return 0;
else
return 1;
}
PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function,
proxy_conn_rec *conn,
proxy_worker *worker,
proxy_server_conf *conf,
server_rec *s)
{
apr_status_t rv;
int connected = 0;
int loglevel;
apr_sockaddr_t *backend_addr = worker->cp->addr;
apr_socket_t *newsock;
if (conn->sock) {
/* This increases the connection pool size
* but the number of dropped connections is
* relatively small compared to connection lifetime
*/
if (!(connected = is_socket_connected(conn->sock))) {
apr_socket_close(conn->sock);
conn->sock = NULL;
}
}
while (backend_addr && !connected) {
if ((rv = apr_socket_create(&newsock, backend_addr->family,
SOCK_STREAM, 0, conn->pool)) != APR_SUCCESS) {
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s,
"proxy: %s: error creating fam %d socket for target %s",
proxy_function,
backend_addr->family,
worker->hostname);
/* this could be an IPv6 address from the DNS but the
* local machine won't give us an IPv6 socket; hopefully the
* DNS returned an additional address to try
*/
backend_addr = backend_addr->next;
continue;
}
#if !defined(TPF) && !defined(BEOS)
if (conf->recv_buffer_size > 0 &&
(rv = apr_socket_opt_set(newsock, APR_SO_RCVBUF,
conf->recv_buffer_size))) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_socket_opt_set(SO_RCVBUF): Failed to set "
"ProxyReceiveBufferSize, using default");
}
#endif
/* Set a timeout on the socket */
if (worker->timeout_set == 1) {
apr_socket_timeout_set(newsock, worker->timeout);
}
else {
apr_socket_timeout_set(newsock, s->timeout);
}
/* Set a keepalive option */
if (worker->keepalive) {
if ((rv = apr_socket_opt_set(newsock,
APR_SO_KEEPALIVE, 1)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, rv, s,
"apr_socket_opt_set(SO_KEEPALIVE): Failed to set"
" Keepalive");
}
}
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
"proxy: %s: fam %d socket created to connect to %s",
proxy_function, backend_addr->family, worker->hostname);
/* make the connection out of the socket */
rv = apr_socket_connect(newsock, backend_addr);
/* if an error occurred, loop round and try again */
if (rv != APR_SUCCESS) {
apr_socket_close(newsock);
loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR;
ap_log_error(APLOG_MARK, loglevel, rv, s,
"proxy: %s: attempt to connect to %pI (%s) failed",
proxy_function,
backend_addr,
worker->hostname);
backend_addr = backend_addr->next;
continue;
}
conn->sock = newsock;
conn->worker = worker;
connected = 1;
}
return connected ? 0 : 1;
}