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svc.c
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/*
* Pound - the reverse-proxy load-balancer
* Copyright (C) 2002-2010 Apsis GmbH
*
* This file is part of Pound.
*
* Pound 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 3 of the License, or
* (at your option) any later version.
*
* Pound is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Contact information:
* Apsis GmbH
* P.O.Box
* 8707 Uetikon am See
* Switzerland
* EMail: roseg@apsis.ch
*/
#include "pound.h"
#ifndef LHASH_OF
#define LHASH_OF(x) LHASH
#define CHECKED_LHASH_OF(type, h) h
#endif
/*
* Add a new key/content pair to a hash table
* the table should be already locked
*/
static void
t_add(LHASH_OF(TABNODE) *const tab, const char *key, const void *content, const size_t cont_len)
{
TABNODE *t, *old;
if((t = (TABNODE *)malloc(sizeof(TABNODE))) == NULL) {
logmsg(LOG_WARNING, "t_add() content malloc");
return;
}
if((t->key = strdup(key)) == NULL) {
free(t);
logmsg(LOG_WARNING, "t_add() strdup");
return;
}
if((t->content = malloc(cont_len)) == NULL) {
free(t->key);
free(t);
logmsg(LOG_WARNING, "t_add() content malloc");
return;
}
memcpy(t->content, content, cont_len);
t->last_acc = time(NULL);
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
if((old = LHM_lh_insert(TABNODE, tab, t)) != NULL) {
#else
if((old = (TABNODE *)lh_insert(tab, t)) != NULL) {
#endif
free(old->key);
free(old->content);
free(old);
logmsg(LOG_WARNING, "t_add() DUP");
}
return;
}
/*
* Find a key
* returns the content in the parameter
* side-effect: update the time of last access
*/
static void *
t_find(LHASH_OF(TABNODE) *const tab, char *const key)
{
TABNODE t, *res;
t.key = key;
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
if((res = (TABNODE *)LHM_lh_retrieve(TABNODE, tab, &t)) != NULL) {
#else
if((res = (TABNODE *)lh_retrieve(tab, &t)) != NULL) {
#endif
res->last_acc = time(NULL);
return res->content;
}
return NULL;
}
/*
* Delete a key
*/
static void
t_remove(LHASH_OF(TABNODE) *const tab, char *const key)
{
TABNODE t, *res;
t.key = key;
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
if((res = LHM_lh_delete(TABNODE, tab, &t)) != NULL) {
#else
if((res = (TABNODE *)lh_delete(tab, &t)) != NULL) {
#endif
free(res->key);
free(res->content);
free(res);
}
return;
}
typedef struct {
LHASH_OF(TABNODE) *tab;
time_t lim;
void *content;
int cont_len;
} ALL_ARG;
static void
t_old_doall_arg(TABNODE *t, ALL_ARG *a)
{
TABNODE *res;
if(t->last_acc < a->lim)
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
if((res = LHM_lh_delete(TABNODE, a->tab, t)) != NULL) {
#else
if((res = lh_delete(a->tab, t)) != NULL) {
#endif
free(res->key);
free(res->content);
free(res);
}
return;
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
IMPLEMENT_LHASH_DOALL_ARG_FN(t_old, TABNODE, ALL_ARG)
#else
#define t_old t_old_doall_arg
IMPLEMENT_LHASH_DOALL_ARG_FN(t_old, TABNODE *, ALL_ARG *)
#endif
/*
* Expire all old nodes
*/
static void
t_expire(LHASH_OF(TABNODE) *const tab, const time_t lim)
{
ALL_ARG a;
int down_load;
a.tab = tab;
a.lim = lim;
down_load = CHECKED_LHASH_OF(TABNODE, tab)->down_load;
CHECKED_LHASH_OF(TABNODE, tab)->down_load = 0;
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
LHM_lh_doall_arg(TABNODE, tab, LHASH_DOALL_ARG_FN(t_old), ALL_ARG, &a);
#else
lh_doall_arg(tab, LHASH_DOALL_ARG_FN(t_old), &a);
#endif
CHECKED_LHASH_OF(TABNODE, tab)->down_load = down_load;
return;
}
static void
t_cont_doall_arg(TABNODE *t, ALL_ARG *arg)
{
TABNODE *res;
if(memcmp(t->content, arg->content, arg->cont_len) == 0)
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
if((res = LHM_lh_delete(TABNODE, arg->tab, t)) != NULL) {
#else
if((res = lh_delete(arg->tab, t)) != NULL) {
#endif
free(res->key);
free(res->content);
free(res);
}
return;
}
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
IMPLEMENT_LHASH_DOALL_ARG_FN(t_cont, TABNODE, ALL_ARG)
#else
#define t_cont t_cont_doall_arg
IMPLEMENT_LHASH_DOALL_ARG_FN(t_cont, TABNODE *, ALL_ARG *)
#endif
/*
* Remove all nodes with the given content
*/
static void
t_clean(LHASH_OF(TABNODE) *const tab, void *const content, const size_t cont_len)
{
ALL_ARG a;
int down_load;
a.tab = tab;
a.content = content;
a.cont_len = cont_len;
down_load = CHECKED_LHASH_OF(TABNODE, tab)->down_load;
CHECKED_LHASH_OF(TABNODE, tab)->down_load = 0;
#if OPENSSL_VERSION_NUMBER >= 0x10000000L
LHM_lh_doall_arg(TABNODE, tab, LHASH_DOALL_ARG_FN(t_cont), ALL_ARG, &a);
#else
lh_doall_arg(tab, LHASH_DOALL_ARG_FN(t_cont), &a);
#endif
CHECKED_LHASH_OF(TABNODE, tab)->down_load = down_load;
return;
}
/*
* Log an error to the syslog or to stderr
*/
#ifdef HAVE_STDARG_H
void
logmsg(const int priority, const char *fmt, ...)
{
char buf[MAXBUF + 1];
va_list ap;
struct tm *t_now, t_res;
buf[MAXBUF] = '\0';
va_start(ap, fmt);
vsnprintf(buf, MAXBUF, fmt, ap);
va_end(ap);
if(log_facility == -1) {
fprintf((priority == LOG_INFO || priority == LOG_DEBUG)? stdout: stderr, "%s\n", buf);
} else {
if(print_log)
printf("%s\n", buf);
else
syslog(log_facility | priority, "%s", buf);
}
return;
}
#else
void
logmsg(const int priority, const char *fmt, va_alist)
va_dcl
{
char buf[MAXBUF + 1];
va_list ap;
struct tm *t_now, t_res;
buf[MAXBUF] = '\0';
va_start(ap);
vsnprintf(buf, MAXBUF, fmt, ap);
va_end(ap);
if(log_facility == -1) {
fprintf((priority == LOG_INFO || priority == LOG_DEBUG)? stdout: stderr, "%s\n", buf);
} else {
if(print_log)
printf("%s\n", buf);
else
syslog(log_facility | priority, "%s", buf);
}
return;
}
#endif
/*
* Translate inet/inet6 address/port into a string
*/
void
addr2str(char *const res, const int res_len, const struct addrinfo *addr, const int no_port)
{
char buf[MAXBUF];
int port;
void *src;
memset(res, 0, res_len);
#ifdef HAVE_INET_NTOP
switch(addr->ai_family) {
case AF_INET:
src = (void *)&((struct sockaddr_in *)addr->ai_addr)->sin_addr.s_addr;
port = ntohs(((struct sockaddr_in *)addr->ai_addr)->sin_port);
if(inet_ntop(AF_INET, src, buf, MAXBUF - 1) == NULL)
strncpy(buf, "(UNKNOWN)", MAXBUF - 1);
break;
case AF_INET6:
src = (void *)&((struct sockaddr_in6 *)addr->ai_addr)->sin6_addr.s6_addr;
port = ntohs(((struct sockaddr_in6 *)addr->ai_addr)->sin6_port);
if(inet_ntop(AF_INET6, src, buf, MAXBUF - 1) == NULL)
strncpy(buf, "(UNKNOWN)", MAXBUF - 1);
break;
case AF_UNIX:
strncpy(buf, (char *)addr->ai_addr, MAXBUF - 1);
port = 0;
break;
default:
strncpy(buf, "(UNKNOWN)", MAXBUF - 1);
port = 0;
break;
}
if(no_port)
snprintf(res, res_len, "%s", buf);
else
snprintf(res, res_len, "%s:%d", buf, port);
#else
#error "Pound needs inet_ntop()"
#endif
return;
}
/*
* Parse a URL, possibly decoding hexadecimal-encoded characters
*/
int
cpURL(char *res, char *src, int len)
{
int state;
char *kp_res;
for(kp_res = res, state = 0; len > 0; len--)
switch(state) {
case 1:
if(*src >= '0' && *src <= '9') {
*res = *src++ - '0';
state = 2;
} else if(*src >= 'A' && *src <= 'F') {
*res = *src++ - 'A' + 10;
state = 2;
} else if(*src >= 'a' && *src <= 'f') {
*res = *src++ - 'a' + 10;
state = 2;
} else {
*res++ = '%';
*res++ = *src++;
state = 0;
}
break;
case 2:
if(*src >= '0' && *src <= '9') {
*res = *res * 16 + *src++ - '0';
res++;
state = 0;
} else if(*src >= 'A' && *src <= 'F') {
*res = *res * 16 + *src++ - 'A' + 10;
res++;
state = 0;
} else if(*src >= 'a' && *src <= 'f') {
*res = *res * 16 + *src++ - 'a' + 10;
res++;
state = 0;
} else {
*res++ = '%';
*res++ = *(src - 1);
*res++ = *src++;
state = 0;
}
break;
default:
if(*src != '%')
*res++ = *src++;
else {
src++;
state = 1;
}
break;
}
if(state > 0)
*res++ = '%';
if(state > 1)
*res++ = *(src - 1);
*res = '\0';
return res - kp_res;
}
/*
* Parse a header
* return a code and possibly content in the arg
*/
int
check_header(const char *header, char *const content)
{
regmatch_t matches[4];
static struct {
char header[32];
int len;
int val;
} hd_types[] = {
{ "Transfer-encoding", 17, HEADER_TRANSFER_ENCODING },
{ "Content-length", 14, HEADER_CONTENT_LENGTH },
{ "Connection", 10, HEADER_CONNECTION },
{ "Location", 8, HEADER_LOCATION },
{ "Content-location", 16, HEADER_CONTLOCATION },
{ "Host", 4, HEADER_HOST },
{ "Referer", 7, HEADER_REFERER },
{ "User-agent", 10, HEADER_USER_AGENT },
{ "Destination", 11, HEADER_DESTINATION },
{ "Expect", 6, HEADER_EXPECT },
{ "", 0, HEADER_OTHER },
};
int i;
if(!regexec(&HEADER, header, 4, matches, 0)) {
for(i = 0; hd_types[i].len > 0; i++)
if((matches[1].rm_eo - matches[1].rm_so) == hd_types[i].len
&& strncasecmp(header + matches[1].rm_so, hd_types[i].header, hd_types[i].len) == 0) {
/* we know that the original header was read into a buffer of size MAXBUF, so no overflow */
strncpy(content, header + matches[2].rm_so, matches[2].rm_eo - matches[2].rm_so);
content[matches[2].rm_eo - matches[2].rm_so] = '\0';
return hd_types[i].val;
}
return HEADER_OTHER;
} else if(header[0] == ' ' || header[0] == '\t') {
*content = '\0';
return HEADER_OTHER;
} else
return HEADER_ILLEGAL;
}
static int
match_service(const SERVICE *svc, const char *request, char **const headers)
{
MATCHER *m;
int i, found;
/* check for request */
for(m = svc->url; m; m = m->next)
if(regexec(&m->pat, request, 0, NULL, 0))
return 0;
/* check for required headers */
for(m = svc->req_head; m; m = m->next) {
for(found = i = 0; i < (MAXHEADERS - 1) && !found; i++)
if(headers[i] && !regexec(&m->pat, headers[i], 0, NULL, 0))
found = 1;
if(!found)
return 0;
}
/* check for forbidden headers */
for(m = svc->deny_head; m; m = m->next) {
for(found = i = 0; i < (MAXHEADERS - 1) && !found; i++)
if(headers[i] && !regexec(&m->pat, headers[i], 0, NULL, 0))
found = 1;
if(found)
return 0;
}
return 1;
}
/*
* Find the right service for a request
*/
SERVICE *
get_service(const LISTENER *lstn, const char *request, char **const headers)
{
SERVICE *svc;
for(svc = lstn->services; svc; svc = svc->next) {
if(svc->disabled)
continue;
if(match_service(svc, request, headers))
return svc;
}
/* try global services */
for(svc = services; svc; svc = svc->next) {
if(svc->disabled)
continue;
if(match_service(svc, request, headers))
return svc;
}
/* nothing matched */
return NULL;
}
/*
* extract the session key for a given request
*/
static int
get_REQUEST(char *res, const SERVICE *svc, const char *request)
{
int n, s;
regmatch_t matches[4];
if(regexec(&svc->sess_start, request, 4, matches, 0)) {
res[0] = '\0';
return 0;
}
s = matches[0].rm_eo;
if(regexec(&svc->sess_pat, request + s, 4, matches, 0)) {
res[0] = '\0';
return 0;
}
if((n = matches[1].rm_eo - matches[1].rm_so) > KEY_SIZE)
n = KEY_SIZE;
strncpy(res, request + s + matches[1].rm_so, n);
res[n] = '\0';
return 1;
}
static int
get_HEADERS(char *res, const SERVICE *svc, char **const headers)
{
int i, n, s;
regmatch_t matches[4];
/* this will match SESS_COOKIE, SESS_HEADER and SESS_BASIC */
res[0] = '\0';
for(i = 0; i < (MAXHEADERS - 1); i++) {
if(headers[i] == NULL)
continue;
if(regexec(&svc->sess_start, headers[i], 4, matches, 0))
continue;
s = matches[0].rm_eo;
if(regexec(&svc->sess_pat, headers[i] + s, 4, matches, 0))
continue;
if((n = matches[1].rm_eo - matches[1].rm_so) > KEY_SIZE)
n = KEY_SIZE;
strncpy(res, headers[i] + s + matches[1].rm_so, n);
res[n] = '\0';
}
return res[0] != '\0';
}
/*
* Pick a random back-end from a candidate list
*/
static BACKEND *
rand_backend(BACKEND *be, int pri)
{
while(be) {
if(!be->alive || be->disabled) {
be = be->next;
continue;
}
if((pri -= be->priority) < 0)
break;
be = be->next;
}
return be;
}
/*
* return a back-end based on a fixed hash value
* this is used for session_ttl < 0
*
* WARNING: the function may return different back-ends
* if the target back-end is disabled or not alive
*/
static BACKEND *
hash_backend(BACKEND *be, int abs_pri, char *key)
{
unsigned long hv;
BACKEND *res, *tb;
int pri;
hv = 2166136261;
while(*key)
hv = ((hv ^ *key++) * 16777619) & 0xFFFFFFFF;
pri = hv % abs_pri;
for(tb = be; tb; tb = tb->next)
if((pri -= tb->priority) < 0)
break;
if(!tb)
/* should NEVER happen */
return NULL;
for(res = tb; !res->alive || res->disabled; ) {
res = res->next;
if(res == NULL)
res = be;
if(res == tb)
/* NO back-end available */
return NULL;
}
return res;
}
/*
* Find the right back-end for a request
*/
BACKEND *
get_backend(SERVICE *const svc, const struct addrinfo *from_host, const char *request, char **const headers)
{
BACKEND *res;
char key[KEY_SIZE + 1];
int ret_val, no_be;
void *vp;
if(ret_val = pthread_mutex_lock(&svc->mut))
logmsg(LOG_WARNING, "get_backend() lock: %s", strerror(ret_val));
no_be = (svc->tot_pri <= 0);
switch(svc->sess_type) {
case SESS_NONE:
/* choose one back-end randomly */
res = no_be? svc->emergency: rand_backend(svc->backends, random() % svc->tot_pri);
break;
case SESS_IP:
addr2str(key, KEY_SIZE, from_host, 1);
if(svc->sess_ttl < 0)
res = no_be? svc->emergency: hash_backend(svc->backends, svc->abs_pri, key);
else if((vp = t_find(svc->sessions, key)) == NULL) {
if(no_be)
res = svc->emergency;
else {
/* no session yet - create one */
res = rand_backend(svc->backends, random() % svc->tot_pri);
t_add(svc->sessions, key, &res, sizeof(res));
}
} else
memcpy(&res, vp, sizeof(res));
break;
case SESS_URL:
case SESS_PARM:
if(get_REQUEST(key, svc, request)) {
if(svc->sess_ttl < 0)
res = no_be? svc->emergency: hash_backend(svc->backends, svc->abs_pri, key);
else if((vp = t_find(svc->sessions, key)) == NULL) {
if(no_be)
res = svc->emergency;
else {
/* no session yet - create one */
res = rand_backend(svc->backends, random() % svc->tot_pri);
t_add(svc->sessions, key, &res, sizeof(res));
}
} else
memcpy(&res, vp, sizeof(res));
} else {
res = no_be? svc->emergency: rand_backend(svc->backends, random() % svc->tot_pri);
}
break;
default:
/* this works for SESS_BASIC, SESS_HEADER and SESS_COOKIE */
if(get_HEADERS(key, svc, headers)) {
if(svc->sess_ttl < 0)
res = no_be? svc->emergency: hash_backend(svc->backends, svc->abs_pri, key);
else if((vp = t_find(svc->sessions, key)) == NULL) {
if(no_be)
res = svc->emergency;
else {
/* no session yet - create one */
res = rand_backend(svc->backends, random() % svc->tot_pri);
t_add(svc->sessions, key, &res, sizeof(res));
}
} else
memcpy(&res, vp, sizeof(res));
} else {
res = no_be? svc->emergency: rand_backend(svc->backends, random() % svc->tot_pri);
}
break;
}
if(ret_val = pthread_mutex_unlock(&svc->mut))
logmsg(LOG_WARNING, "get_backend() unlock: %s", strerror(ret_val));
return res;
}
/*
* (for cookies/header only) possibly create session based on response headers
*/
void
upd_session(SERVICE *const svc, char **const headers, BACKEND *const be)
{
char key[KEY_SIZE + 1];
int ret_val;
if(svc->sess_type != SESS_HEADER && svc->sess_type != SESS_COOKIE)
return;
if(ret_val = pthread_mutex_lock(&svc->mut))
logmsg(LOG_WARNING, "upd_session() lock: %s", strerror(ret_val));
if(get_HEADERS(key, svc, headers))
if(t_find(svc->sessions, key) == NULL)
t_add(svc->sessions, key, &be, sizeof(be));
if(ret_val = pthread_mutex_unlock(&svc->mut))
logmsg(LOG_WARNING, "upd_session() unlock: %s", strerror(ret_val));
return;
}
/*
* mark a backend host as dead/disabled; remove its sessions if necessary
* disable_only == 1: mark as disabled
* disable_only == 0: mark as dead, remove sessions
* disable_only == -1: mark as enabled
*/
void
kill_be(SERVICE *const svc, const BACKEND *be, const int disable_mode)
{
BACKEND *b;
int ret_val;
char buf[MAXBUF];
if(ret_val = pthread_mutex_lock(&svc->mut))
logmsg(LOG_WARNING, "kill_be() lock: %s", strerror(ret_val));
svc->tot_pri = 0;
for(b = svc->backends; b; b = b->next) {
if(b == be)
switch(disable_mode) {
case BE_DISABLE:
b->disabled = 1;
str_be(buf, MAXBUF - 1, b);
logmsg(LOG_NOTICE, "(%lx) BackEnd %s disabled", pthread_self(), buf);
break;
case BE_KILL:
b->alive = 0;
str_be(buf, MAXBUF - 1, b);
logmsg(LOG_NOTICE, "(%lx) BackEnd %s dead (killed)", pthread_self(), buf);
t_clean(svc->sessions, &be, sizeof(be));
break;
case BE_ENABLE:
str_be(buf, MAXBUF - 1, b);
logmsg(LOG_NOTICE, "(%lx) BackEnd %s enabled", pthread_self(), buf);
b->disabled = 0;
break;
default:
logmsg(LOG_WARNING, "kill_be(): unknown mode %d", disable_mode);
break;
}
if(b->alive && !b->disabled)
svc->tot_pri += b->priority;
}
if(ret_val = pthread_mutex_unlock(&svc->mut))
logmsg(LOG_WARNING, "kill_be() unlock: %s", strerror(ret_val));
return;
}
/*
* Update the number of requests and time to answer for a given back-end
*/
void
upd_be(SERVICE *const svc, BACKEND *const be, const double elapsed)
{
int ret_val;
if(svc->dynscale) {
if(ret_val = pthread_mutex_lock(&be->mut))
logmsg(LOG_WARNING, "upd_be() lock: %s", strerror(ret_val));
be->t_requests += elapsed;
if(++be->n_requests > RESCALE_MAX) {
/* scale it down */
be->n_requests /= 2;
be->t_requests /= 2;
}
be->t_average = be->t_requests / be->n_requests;
if(ret_val = pthread_mutex_unlock(&be->mut))
logmsg(LOG_WARNING, "upd_be() unlock: %s", strerror(ret_val));
}
return;
}
/*
* Search for a host name, return the addrinfo for it
*/
int
get_host(char *const name, struct addrinfo *res, int ai_family)
{
struct addrinfo *chain, *ap;
struct addrinfo hints;
int ret_val;
#ifdef HAVE_INET_NTOP
memset (&hints, 0, sizeof(hints));
hints.ai_family = ai_family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
if((ret_val = getaddrinfo(name, NULL, &hints, &chain)) == 0) {
#ifdef _AIX
ap = chain;
#else
for(ap = chain; ap != NULL; ap = ap->ai_next)
if(ap->ai_socktype == SOCK_STREAM)
break;
#endif
if(ap == NULL) {
freeaddrinfo(chain);
return EAI_NONAME;
}
*res = *ap;
if((res->ai_addr = (struct sockaddr *)malloc(ap->ai_addrlen)) == NULL) {
freeaddrinfo(chain);
return EAI_MEMORY;
}
memcpy(res->ai_addr, ap->ai_addr, ap->ai_addrlen);
freeaddrinfo(chain);
}
#else
#error "Pound requires getaddrinfo()"
#endif
return ret_val;
}
/*
* Find if a redirect needs rewriting
* In general we have two possibilities that require it:
* (1) if the redirect was done to the correct location with the wrong port
* (2) if the redirect was done to the back-end rather than the listener
*/
int
need_rewrite(const int rewr_loc, char *const location, char *const path, const char *v_host, const LISTENER *lstn, const BACKEND *be)
{
struct addrinfo addr;
struct sockaddr_in in_addr, be_addr;
struct sockaddr_in6 in6_addr, be6_addr;
regmatch_t matches[4];
char *proto, *host, *port, *cp, buf[MAXBUF];
/* check if rewriting is required at all */
if(rewr_loc == 0)
return 0;
/* applies only to INET/INET6 back-ends */
if(be->addr.ai_family != AF_INET && be->addr.ai_family != AF_INET6)
return 0;
/* split the location into its fields */
if(regexec(&LOCATION, location, 4, matches, 0))
return 0;
proto = location + matches[1].rm_so;
host = location + matches[2].rm_so;
if(location[matches[3].rm_so] == '/')
matches[3].rm_so++;
/* path is guaranteed to be large enough */
strcpy(path, location + matches[3].rm_so);
location[matches[1].rm_eo] = location[matches[2].rm_eo] = '\0';
if((port = strchr(host, ':')) != NULL)
*port++ = '\0';
/*
* Check if the location has the same address as the listener or the back-end
*/
memset(&addr, 0, sizeof(addr));
if(get_host(host, &addr, be->addr.ai_family))
return 0;
/*
* compare the back-end
*/
if(addr.ai_family != be->addr.ai_family) {
free(addr.ai_addr);
return 0;
}
if(addr.ai_family == AF_INET) {
memcpy(&in_addr, addr.ai_addr, sizeof(in_addr));
memcpy(&be_addr, be->addr.ai_addr, sizeof(be_addr));
if(port)
in_addr.sin_port = (in_port_t)htons(atoi(port));
else if(!strcasecmp(proto, "https"))
in_addr.sin_port = (in_port_t)htons(443);
else
in_addr.sin_port = (in_port_t)htons(80);
/*
* check if the Location points to the back-end
*/
if(memcmp(&be_addr.sin_addr.s_addr, &in_addr.sin_addr.s_addr, sizeof(in_addr.sin_addr.s_addr)) == 0
&& memcmp(&be_addr.sin_port, &in_addr.sin_port, sizeof(in_addr.sin_port)) == 0) {
free(addr.ai_addr);
return 1;
}
} else /* AF_INET6 */ {
memcpy(&in6_addr, addr.ai_addr, sizeof(in6_addr));
memcpy(&be6_addr, be->addr.ai_addr, sizeof(be6_addr));
if(port)
in6_addr.sin6_port = (in_port_t)htons(atoi(port));
else if(!strcasecmp(proto, "https"))
in6_addr.sin6_port = (in_port_t)htons(443);
else
in6_addr.sin6_port = (in_port_t)htons(80);
/*
* check if the Location points to the back-end
*/
if(memcmp(&be6_addr.sin6_addr.s6_addr, &in6_addr.sin6_addr.s6_addr, sizeof(in6_addr.sin6_addr.s6_addr)) == 0
&& memcmp(&be6_addr.sin6_port, &in6_addr.sin6_port, sizeof(in6_addr.sin6_port)) == 0) {
free(addr.ai_addr);
return 1;
}
}
/*
* compare the listener
*/
if(rewr_loc != 1 || addr.ai_family != lstn->addr.ai_family) {
free(addr.ai_addr);
return 0;
}
memset(buf, '\0', MAXBUF);
strncpy(buf, v_host, MAXBUF - 1);
if((cp = strchr(buf, ':')) != NULL)
*cp = '\0';
if(addr.ai_family == AF_INET) {
memcpy(&be_addr, lstn->addr.ai_addr, sizeof(be_addr));
/*
* check if the Location points to the Listener but with the wrong port or protocol
*/
if((memcmp(&be_addr.sin_addr.s_addr, &in_addr.sin_addr.s_addr, sizeof(in_addr.sin_addr.s_addr)) == 0
|| strcasecmp(host, buf) == 0)
&& (memcmp(&be_addr.sin_port, &in_addr.sin_port, sizeof(in_addr.sin_port)) != 0
|| strcasecmp(proto, lstn->ctx? "http": "https"))) {
free(addr.ai_addr);
return 1;
}
} else {
memcpy(&be6_addr, lstn->addr.ai_addr, sizeof(be6_addr));
/*
* check if the Location points to the Listener but with the wrong port or protocol
*/
if((memcmp(&be6_addr.sin6_addr.s6_addr, &in6_addr.sin6_addr.s6_addr, sizeof(in6_addr.sin6_addr.s6_addr)) == 0
|| strcasecmp(host, buf) == 0)
&& (memcmp(&be6_addr.sin6_port, &in6_addr.sin6_port, sizeof(in6_addr.sin6_port)) != 0
|| strcasecmp(proto, lstn->ctx? "http": "https"))) {
free(addr.ai_addr);
return 1;
}
}
free(addr.ai_addr);
return 0;
}
/*
* Non-blocking connect(). Does the same as connect(2) but ensures
* it will time-out after a much shorter time period SERVER_TO
*/
int
connect_nb(const int sockfd, const struct addrinfo *serv_addr, const int to)
{
int flags, res, error;
socklen_t len;
struct pollfd p;
if((flags = fcntl(sockfd, F_GETFL, 0)) < 0) {
logmsg(LOG_WARNING, "(%lx) connect_nb: fcntl GETFL failed: %s", pthread_self(), strerror(errno));
return -1;
}
if(fcntl(sockfd, F_SETFL, flags | O_NONBLOCK) < 0) {
logmsg(LOG_WARNING, "(%lx) connect_nb: fcntl SETFL failed: %s", pthread_self(), strerror(errno));
return -1;
}
error = 0;
if((res = connect(sockfd, serv_addr->ai_addr, serv_addr->ai_addrlen)) < 0)
if(errno != EINPROGRESS) {
logmsg(LOG_WARNING, "(%lx) connect_nb: connect failed: %s", pthread_self(), strerror(errno));
return (-1);
}
if(res == 0) {
/* connect completed immediately (usually localhost) */
if(fcntl(sockfd, F_SETFL, flags) < 0) {
logmsg(LOG_WARNING, "(%lx) connect_nb: fcntl reSETFL failed: %s", pthread_self(), strerror(errno));
return -1;
}
return 0;
}
memset(&p, 0, sizeof(p));
p.fd = sockfd;
p.events = POLLOUT;
if((res = poll(&p, 1, to * 1000)) != 1) {
if(res == 0) {
/* timeout */
logmsg(LOG_WARNING, "(%lx) connect_nb: poll timed out", pthread_self());
errno = ETIMEDOUT;
} else
logmsg(LOG_WARNING, "(%lx) connect_nb: poll failed: %s", pthread_self(), strerror(errno));
return -1;
}
/* socket is writeable == operation completed */
len = sizeof(error);
if(getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
logmsg(LOG_WARNING, "(%lx) connect_nb: getsockopt failed: %s", pthread_self(), strerror(errno));
return -1;
}
/* restore file status flags */
if(fcntl(sockfd, F_SETFL, flags) < 0) {
logmsg(LOG_WARNING, "(%lx) connect_nb: fcntl reSETFL failed: %s", pthread_self(), strerror(errno));
return -1;
}
if(error) {
/* getsockopt() shows an error */
errno = error;
logmsg(LOG_WARNING, "(%lx) connect_nb: error after getsockopt: %s", pthread_self(), strerror(errno));
return -1;
}
/* really connected */
return 0;
}
/*
* Check if dead hosts returned to life;
* runs every alive seconds
*/
static void
do_resurect(void)
{