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http.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: [email protected]
*/
#include "pound.h"
/* HTTP error replies */
static char *h500 = "500 Internal Server Error",
*h501 = "501 Not Implemented",
*h503 = "503 Service Unavailable",
*h414 = "414 Request URI too long";
static char *err_response = "HTTP/1.0 %s\r\nContent-Type: text/html\r\nContent-Length: %d\r\nExpires: now\r\nPragma: no-cache\r\nCache-control: no-cache,no-store\r\n\r\n%s";
/*
* Reply with an error
*/
static void
err_reply(BIO *const c, const char *head, const char *txt)
{
BIO_printf(c, err_response, head, strlen(txt), txt);
BIO_flush(c);
return;
}
/*
* Reply with a redirect
*/
static void
redirect_reply(BIO *const c, const char *url, const int code)
{
char rep[MAXBUF], cont[MAXBUF], *code_msg;
switch(code) {
case 301:
code_msg = "Moved Permanently";
break;
case 307:
code_msg = "Temporary Redirect";
break;
default:
code_msg = "Found";
break;
}
snprintf(cont, sizeof(cont),
"<html><head><title>Redirect</title></head><body><h1>Redirect</h1><p>You should go to <a href=\"%s\">%s</a></p></body></html>",
url, url);
snprintf(rep, sizeof(rep),
"HTTP/1.0 %d %s\r\nLocation: %s\r\nContent-Type: text/html\r\nContent-Length: %d\r\n\r\n",
code, code_msg, url, strlen(cont));
BIO_write(c, rep, strlen(rep));
BIO_write(c, cont, strlen(cont));
BIO_flush(c);
return;
}
/*
* Read and write some binary data
*/
static int
copy_bin(BIO *const cl, BIO *const be, long cont, long *res_bytes, const int no_write)
{
char buf[MAXBUF];
int res;
while(cont > 0L) {
if((res = BIO_read(cl, buf, cont > MAXBUF? MAXBUF: cont)) < 0)
return -1;
else if(res == 0)
return -2;
if(!no_write)
if(BIO_write(be, buf, res) != res)
return -3;
cont -= res;
if(res_bytes)
*res_bytes += res;
}
if(!no_write)
if(BIO_flush(be) != 1)
return -4;
return 0;
}
/*
* Get a "line" from a BIO, strip the trailing newline, skip the input stream if buffer too small
* The result buffer is NULL terminated
* Return 0 on success
*/
static
get_line(BIO *const in, char *const buf, const int bufsize)
{
char tmp;
int i, n_read;
memset(buf, 0, bufsize);
for(n_read = 0;;)
switch(BIO_gets(in, buf + n_read, bufsize - n_read - 1)) {
case -2:
/* BIO_gets not implemented */
return -1;
case 0:
case -1:
return 1;
default:
for(i = n_read; i < bufsize && buf[i]; i++)
if(buf[i] == '\n' || buf[i] == '\r') {
buf[i] = '\0';
return 0;
}
if(i < bufsize) {
n_read = i;
continue;
}
logmsg(LOG_NOTICE, "(%lx) line too long: %s", pthread_self(), buf);
/* skip rest of "line" */
tmp = '\0';
while(tmp != '\n')
if(BIO_read(in, &tmp, 1) != 1)
return 1;
break;
}
return 0;
}
/*
* Strip trailing CRLF
*/
static
strip_eol(char *lin)
{
while(*lin)
if(*lin == '\n' || (*lin == '\r' && *(lin + 1) == '\n')) {
*lin = '\0';
return 1;
} else
lin++;
return 0;
}
/*
* Copy chunked
*/
static int
copy_chunks(BIO *const cl, BIO *const be, long *res_bytes, const int no_write, const long max_size)
{
char buf[MAXBUF];
long cont, tot_size;
regmatch_t matches[2];
int has_eol, res;
for(tot_size = 0L;;) {
if((res = get_line(cl, buf, MAXBUF)) < 0) {
logmsg(LOG_NOTICE, "(%lx) chunked read error: %s", pthread_self(), strerror(errno));
return -1;
} else if(res > 0)
/* EOF */
return 0;
if(!regexec(&CHUNK_HEAD, buf, 2, matches, 0))
cont = strtol(buf, NULL, 16);
else {
/* not chunk header */
logmsg(LOG_NOTICE, "(%lx) bad chunk header <%s>: %s", pthread_self(), buf, strerror(errno));
return -2;
}
if(!no_write)
if(BIO_printf(be, "%s\r\n", buf) <= 0) {
logmsg(LOG_NOTICE, "(%lx) error write chunked: %s", pthread_self(), strerror(errno));
return -3;
}
tot_size += cont;
if(max_size > 0L && tot_size > max_size) {
logmsg(LOG_WARNING, "(%lx) chunk content too large", pthread_self);
return -4;
}
if(cont > 0L) {
if(copy_bin(cl, be, cont, res_bytes, no_write)) {
if(errno)
logmsg(LOG_NOTICE, "(%lx) error copy chunk cont: %s", pthread_self(), strerror(errno));
return -4;
}
} else
break;
/* final CRLF */
if((res = get_line(cl, buf, MAXBUF)) < 0) {
logmsg(LOG_NOTICE, "(%lx) error after chunk: %s", pthread_self(), strerror(errno));
return -5;
} else if(res > 0) {
logmsg(LOG_NOTICE, "(%lx) unexpected EOF after chunk", pthread_self());
return -5;
}
if(buf[0])
logmsg(LOG_NOTICE, "(%lx) unexpected after chunk \"%s\"", pthread_self(), buf);
if(!no_write)
if(BIO_printf(be, "%s\r\n", buf) <= 0) {
logmsg(LOG_NOTICE, "(%lx) error after chunk write: %s", pthread_self(), strerror(errno));
return -6;
}
}
/* possibly trailing headers */
for(;;) {
if((res = get_line(cl, buf, MAXBUF)) < 0) {
logmsg(LOG_NOTICE, "(%lx) error post-chunk: %s", pthread_self(), strerror(errno));
return -7;
} else if(res > 0)
break;
if(!no_write)
if(BIO_printf(be, "%s\r\n", buf) <= 0) {
logmsg(LOG_NOTICE, "(%lx) error post-chunk write: %s", pthread_self(), strerror(errno));
return -8;
}
if(!buf[0])
break;
}
if(!no_write)
if(BIO_flush(be) != 1) {
logmsg(LOG_NOTICE, "(%lx) copy_chunks flush error: %s", pthread_self(), strerror(errno));
return -4;
}
return 0;
}
static int err_to = -1;
/*
* Time-out for client read/gets
* the SSL manual says not to do it, but it works well enough anyway...
*/
static long
bio_callback(BIO *const bio, const int cmd, const char *argp, int argi, long argl, long ret)
{
struct pollfd p;
int to, p_res, p_err;
if(cmd != BIO_CB_READ && cmd != BIO_CB_WRITE)
return ret;
/* a time-out already occured */
if((to = *((int *)BIO_get_callback_arg(bio)) * 1000) < 0) {
errno = ETIMEDOUT;
return -1;
}
for(;;) {
memset(&p, 0, sizeof(p));
BIO_get_fd(bio, &p.fd);
p.events = (cmd == BIO_CB_READ)? (POLLIN | POLLPRI): POLLOUT;
p_res = poll(&p, 1, to);
p_err = errno;
switch(p_res) {
case 1:
if(cmd == BIO_CB_READ) {
if((p.revents & POLLIN) || (p.revents & POLLPRI))
/* there is readable data */
return ret;
else {
#ifdef EBUG
logmsg(LOG_WARNING, "(%lx) CALLBACK read 0x%04x poll: %s",
pthread_self(), p.revents, strerror(p_err));
#endif
errno = EIO;
}
} else {
if(p.revents & POLLOUT)
/* data can be written */
return ret;
else {
#ifdef EBUG
logmsg(LOG_WARNING, "(%lx) CALLBACK write 0x%04x poll: %s",
pthread_self(), p.revents, strerror(p_err));
#endif
errno = ECONNRESET;
}
}
return -1;
case 0:
/* timeout - mark the BIO as unusable for the future */
BIO_set_callback_arg(bio, (char *)&err_to);
#ifdef EBUG
logmsg(LOG_WARNING, "(%lx) CALLBACK timeout poll after %d secs: %s",
pthread_self(), to / 1000, strerror(p_err));
#endif
errno = ETIMEDOUT;
return 0;
default:
/* error */
if(p_err != EINTR) {
#ifdef EBUG
logmsg(LOG_WARNING, "(%lx) CALLBACK bad %d poll: %s",
pthread_self(), p_res, strerror(p_err));
#endif
return -2;
#ifdef EBUG
} else
logmsg(LOG_WARNING, "(%lx) CALLBACK interrupted %d poll: %s",
pthread_self(), p_res, strerror(p_err));
#else
}
#endif
}
}
}
/*
* Check if the file underlying a BIO is readable
*/
static int
is_readable(BIO *const bio, const int to_wait)
{
struct pollfd p;
if(BIO_pending(bio) > 0)
return 1;
memset(&p, 0, sizeof(p));
BIO_get_fd(bio, &p.fd);
p.events = POLLIN | POLLPRI;
return (poll(&p, 1, to_wait * 1000) > 0);
}
static void
free_headers(char **headers)
{
int i;
for(i = 0; i < MAXHEADERS; i++)
if(headers[i])
free(headers[i]);
free(headers);
return;
}
static char **
get_headers(BIO *const in, BIO *const cl, const LISTENER *lstn)
{
char **headers, buf[MAXBUF];
int res, n, has_eol;
/* HTTP/1.1 allows leading CRLF */
memset(buf, 0, MAXBUF);
while((res = BIO_gets(in, buf, MAXBUF - 1)) > 0) {
has_eol = strip_eol(buf);
if(buf[0])
break;
}
if(res <= 0) {
/* this is expected to occur only on client reads */
/* logmsg(LOG_NOTICE, "headers: bad starting read"); */
return NULL;
} else if(!has_eol) {
/* check for request length limit */
logmsg(LOG_WARNING, "(%lx) e414 headers: request URI too long", pthread_self());
err_reply(cl, h414, lstn->err414);
return NULL;
}
if((headers = (char **)calloc(MAXHEADERS, sizeof(char *))) == NULL) {
logmsg(LOG_WARNING, "(%lx) e500 headers: out of memory", pthread_self());
err_reply(cl, h500, lstn->err500);
return NULL;
}
if((headers[0] = (char *)malloc(MAXBUF)) == NULL) {
free_headers(headers);
logmsg(LOG_WARNING, "(%lx) e500 header: out of memory", pthread_self());
err_reply(cl, h500, lstn->err500);
return NULL;
}
memset(headers[0], 0, MAXBUF);
strncpy(headers[0], buf, MAXBUF - 1);
for(n = 1; n < MAXHEADERS; n++) {
if(get_line(in, buf, MAXBUF)) {
free_headers(headers);
logmsg(LOG_WARNING, "(%lx) e500 can't read header", pthread_self());
err_reply(cl, h500, lstn->err500);
return NULL;
}
if(!buf[0])
return headers;
if((headers[n] = (char *)malloc(MAXBUF)) == NULL) {
free_headers(headers);
logmsg(LOG_WARNING, "(%lx) e500 header: out of memory", pthread_self());
err_reply(cl, h500, lstn->err500);
return NULL;
}
memset(headers[n], 0, MAXBUF);
strncpy(headers[n], buf, MAXBUF - 1);
}
free_headers(headers);
logmsg(LOG_NOTICE, "(%lx) e500 too many headers", pthread_self());
err_reply(cl, h500, lstn->err500);
return NULL;
}
#define LOG_TIME_SIZE 32
/*
* Apache log-file-style time format
*/
static void
log_time(char *res)
{
time_t now;
struct tm *t_now, t_res;
now = time(NULL);
#ifdef HAVE_LOCALTIME_R
t_now = localtime_r(&now, &t_res);
#else
t_now = localtime(&now);
#endif
strftime(res, LOG_TIME_SIZE - 1, "%d/%b/%Y:%H:%M:%S %z", t_now);
return;
}
static double
cur_time(void)
{
#ifdef HAVE_GETTIMEOFDAY
struct timeval tv;
struct timezone tz;
int sv_errno;
sv_errno = errno;
gettimeofday(&tv, &tz);
errno = sv_errno;
return tv.tv_sec * 1000000.0 + tv.tv_usec;
#else
return time(NULL) * 1000000.0;
#endif
}
#define LOG_BYTES_SIZE 16
/*
* Apache log-file-style number format
*/
static void
log_bytes(char *res, const long cnt)
{
if(cnt > 0L)
snprintf(res, LOG_BYTES_SIZE - 1, "%ld", cnt);
else
strcpy(res, "-");
return;
}
/* Cleanup code. This should really be in the pthread_cleanup_push, except for bugs in some implementations */
#define clean_all() { \
if(ssl != NULL) { BIO_ssl_shutdown(cl); } \
if(be != NULL) { BIO_flush(be); BIO_reset(be); BIO_free_all(be); be = NULL; } \
if(cl != NULL) { BIO_flush(cl); BIO_reset(cl); BIO_free_all(cl); cl = NULL; } \
if(x509 != NULL) { X509_free(x509); x509 = NULL; } \
if(ssl != NULL) { ERR_clear_error(); ERR_remove_state(0); } \
}
/*
* handle an HTTP request
*/
void *
thr_http(void *arg)
{
int cl_11, be_11, res, chunked, n, sock, no_cont, skip, conn_closed, force_10, sock_proto;
LISTENER *lstn;
SERVICE *svc;
BACKEND *backend, *cur_backend, *old_backend;
struct addrinfo from_host, z_addr;
struct sockaddr_storage from_host_addr;
BIO *cl, *be, *bb, *b64;
X509 *x509;
char request[MAXBUF], response[MAXBUF], buf[MAXBUF], url[MAXBUF], loc_path[MAXBUF], **headers,
headers_ok[MAXHEADERS], v_host[MAXBUF], referer[MAXBUF], u_agent[MAXBUF], u_name[MAXBUF],
caddr[MAXBUF], req_time[LOG_TIME_SIZE], s_res_bytes[LOG_BYTES_SIZE], *mh;
SSL *ssl, *be_ssl;
long cont, res_bytes;
regmatch_t matches[4];
struct linger l;
double start_req, end_req;
from_host = ((thr_arg *)arg)->from_host;
memcpy(&from_host_addr, from_host.ai_addr, from_host.ai_addrlen);
from_host.ai_addr = (struct sockaddr *)&from_host_addr;
lstn = ((thr_arg *)arg)->lstn;
sock = ((thr_arg *)arg)->sock;
free(((thr_arg *)arg)->from_host.ai_addr);
free(arg);
n = 1;
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&n, sizeof(n));
l.l_onoff = 1;
l.l_linger = 10;
setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&l, sizeof(l));
#ifdef TCP_LINGER2
n = 5;
setsockopt(sock, SOL_TCP, TCP_LINGER2, (void *)&n, sizeof(n));
#endif
n = 1;
setsockopt(sock, SOL_TCP, TCP_NODELAY, (void *)&n, sizeof(n));
cl = NULL;
be = NULL;
ssl = NULL;
x509 = NULL;
if((cl = BIO_new_socket(sock, 1)) == NULL) {
logmsg(LOG_WARNING, "(%lx) BIO_new_socket failed", pthread_self());
shutdown(sock, 2);
close(sock);
pthread_exit(NULL);
}
if(lstn->to > 0) {
BIO_set_callback_arg(cl, (char *)&lstn->to);
BIO_set_callback(cl, bio_callback);
}
if(lstn->ctx != NULL) {
if((ssl = SSL_new(lstn->ctx)) == NULL) {
logmsg(LOG_WARNING, "(%lx) SSL_new: failed", pthread_self());
BIO_reset(cl);
BIO_free_all(cl);
pthread_exit(NULL);
}
SSL_set_bio(ssl, cl, cl);
if((bb = BIO_new(BIO_f_ssl())) == NULL) {
logmsg(LOG_WARNING, "(%lx) BIO_new(Bio_f_ssl()) failed", pthread_self());
BIO_reset(cl);
BIO_free_all(cl);
pthread_exit(NULL);
}
BIO_set_ssl(bb, ssl, BIO_CLOSE);
BIO_set_ssl_mode(bb, 0);
cl = bb;
if(BIO_do_handshake(cl) <= 0) {
/* no need to log every client without a certificate...
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "BIO_do_handshake with %s failed: %s", caddr,
ERR_error_string(ERR_get_error(), NULL));
x509 = NULL;
*/
BIO_reset(cl);
BIO_free_all(cl);
pthread_exit(NULL);
} else {
if((x509 = SSL_get_peer_certificate(ssl)) != NULL && lstn->clnt_check < 3
&& SSL_get_verify_result(ssl) != X509_V_OK) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "Bad certificate from %s", caddr);
BIO_reset(cl);
BIO_free_all(cl);
pthread_exit(NULL);
}
}
} else {
x509 = NULL;
}
cur_backend = NULL;
if((bb = BIO_new(BIO_f_buffer())) == NULL) {
logmsg(LOG_WARNING, "(%lx) BIO_new(buffer) failed", pthread_self());
BIO_reset(cl);
BIO_free_all(cl);
pthread_exit(NULL);
}
BIO_set_close(cl, BIO_CLOSE);
BIO_set_buffer_size(cl, MAXBUF);
cl = BIO_push(bb, cl);
for(cl_11 = be_11 = 0;;) {
res_bytes = 0L;
v_host[0] = referer[0] = u_agent[0] = u_name[0] = '\0';
conn_closed = 0;
for(n = 0; n < MAXHEADERS; n++)
headers_ok[n] = 1;
if((headers = get_headers(cl, cl, lstn)) == NULL) {
if(!cl_11) {
if(errno) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) error read from %s: %s", pthread_self(), caddr, strerror(errno));
/* err_reply(cl, h500, lstn->err500); */
}
}
clean_all();
pthread_exit(NULL);
}
memset(req_time, 0, LOG_TIME_SIZE);
start_req = cur_time();
log_time(req_time);
/* check for correct request */
strncpy(request, headers[0], MAXBUF);
if(!regexec(&lstn->verb, request, 3, matches, 0)) {
no_cont = !strncasecmp(request + matches[1].rm_so, "HEAD", matches[1].rm_eo - matches[1].rm_so);
} else {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_WARNING, "(%lx) e501 bad request \"%s\" from %s", pthread_self(), request, caddr);
err_reply(cl, h501, lstn->err501);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
cl_11 = (request[strlen(request) - 1] == '1');
strncpy(url, request + matches[2].rm_so, matches[2].rm_eo - matches[2].rm_so);
url[matches[2].rm_eo - matches[2].rm_so] = '\0';
if(lstn->has_pat && regexec(&lstn->url_pat, url, 0, NULL, 0)) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) e501 bad URL \"%s\" from %s", pthread_self(), url, caddr);
err_reply(cl, h501, lstn->err501);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
/* check other headers */
for(chunked = 0, cont = 0L, n = 1; n < MAXHEADERS && headers[n]; n++) {
/* no overflow - see check_header for details */
switch(check_header(headers[n], buf)) {
case HEADER_HOST:
strcpy(v_host, buf);
break;
case HEADER_REFERER:
strcpy(referer, buf);
break;
case HEADER_USER_AGENT:
strcpy(u_agent, buf);
break;
case HEADER_CONNECTION:
if(!strcasecmp("close", buf))
conn_closed = 1;
break;
case HEADER_TRANSFER_ENCODING:
if(cont != 0L)
headers_ok[n] = 0;
else if(!strcasecmp("chunked", buf))
if(chunked)
headers_ok[n] = 0;
else
chunked = 1;
break;
case HEADER_CONTENT_LENGTH:
if(chunked)
headers_ok[n] = 0;
else
cont = atol(buf);
break;
case HEADER_ILLEGAL:
if(lstn->log_level > 0) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) bad header from %s (%s)", pthread_self(), caddr, headers[n]);
}
headers_ok[n] = 0;
break;
}
if(headers_ok[n] && lstn->head_off) {
/* maybe header to be removed */
MATCHER *m;
for(m = lstn->head_off; m; m = m->next)
if(!(headers_ok[n] = regexec(&m->pat, headers[n], 0, NULL, 0)))
break;
}
/* get User name */
if(!regexec(&AUTHORIZATION, headers[n], 2, matches, 0)) {
int inlen;
if((bb = BIO_new(BIO_s_mem())) == NULL) {
logmsg(LOG_WARNING, "(%lx) Can't alloc BIO_s_mem", pthread_self());
continue;
}
if((b64 = BIO_new(BIO_f_base64())) == NULL) {
logmsg(LOG_WARNING, "(%lx) Can't alloc BIO_f_base64", pthread_self());
BIO_free(bb);
continue;
}
b64 = BIO_push(b64, bb);
BIO_write(bb, headers[n] + matches[1].rm_so, matches[1].rm_eo - matches[1].rm_so);
BIO_write(bb, "\n", 1);
if((inlen = BIO_read(b64, buf, MAXBUF - 1)) <= 0) {
logmsg(LOG_WARNING, "(%lx) Can't read BIO_f_base64", pthread_self());
BIO_free_all(b64);
continue;
}
BIO_free_all(b64);
if((mh = strchr(buf, ':')) == NULL) {
logmsg(LOG_WARNING, "(%lx) Unknown authentication", pthread_self());
continue;
}
*mh = '\0';
strcpy(u_name, buf);
}
}
/* possibly limited request size */
if(lstn->max_req > 0L && cont > 0L && cont > lstn->max_req) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) e501 request too large (%ld) from %s", pthread_self(), cont, caddr);
err_reply(cl, h501, lstn->err501);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
if(be != NULL) {
if(is_readable(be, 0)) {
/* The only way it's readable is if it's at EOF, so close it! */
BIO_reset(be);
BIO_free_all(be);
be = NULL;
}
}
/* check that the requested URL still fits the old back-end (if any) */
if((svc = get_service(lstn, url, &headers[1])) == NULL) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) e503 no service \"%s\" from %s", pthread_self(), request, caddr);
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
if((backend = get_backend(svc, &from_host, url, &headers[1])) == NULL) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) e503 no back-end \"%s\" from %s", pthread_self(), request, caddr);
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
if(be != NULL && backend != cur_backend) {
BIO_reset(be);
BIO_free_all(be);
be = NULL;
}
while(be == NULL && backend->be_type == 0) {
switch(backend->addr.ai_family) {
case AF_INET:
sock_proto = PF_INET;
break;
case AF_INET6:
sock_proto = PF_INET6;
break;
case AF_UNIX:
sock_proto = PF_UNIX;
break;
default:
logmsg(LOG_WARNING, "(%lx) e503 backend: unknown family %d", pthread_self(), backend->addr.ai_family);
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
break;
}
if((sock = socket(sock_proto, SOCK_STREAM, 0)) < 0) {
str_be(buf, MAXBUF - 1, backend);
logmsg(LOG_WARNING, "(%lx) e503 backend %s socket create: %s", pthread_self(), buf, strerror(errno));
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
if(connect_nb(sock, &backend->addr, backend->conn_to) < 0) {
str_be(buf, MAXBUF - 1, backend);
logmsg(LOG_WARNING, "(%lx) backend %s connect: %s", pthread_self(), buf, strerror(errno));
shutdown(sock, 2);
close(sock);
/*
* kill the back-end only if no HAport is defined for it
* otherwise allow the HAport mechanism to do its job
*/
memset(&z_addr, 0, sizeof(z_addr));
if(memcmp(&(backend->ha_addr), &(z_addr), sizeof(z_addr)) == 0)
kill_be(svc, backend, BE_KILL);
/*
* ...but make sure we don't get into a loop with the same back-end
*/
old_backend = backend;
if((backend = get_backend(svc, &from_host, url, &headers[1])) == NULL || backend == old_backend) {
addr2str(caddr, MAXBUF - 1, &from_host, 1);
logmsg(LOG_NOTICE, "(%lx) e503 no back-end \"%s\" from %s", pthread_self(), request, caddr);
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
continue;
}
if(sock_proto == PF_INET || sock_proto == PF_INET6) {
n = 1;
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&n, sizeof(n));
l.l_onoff = 1;
l.l_linger = 10;
setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&l, sizeof(l));
#ifdef TCP_LINGER2
n = 5;
setsockopt(sock, SOL_TCP, TCP_LINGER2, (void *)&n, sizeof(n));
#endif
n = 1;
setsockopt(sock, SOL_TCP, TCP_NODELAY, (void *)&n, sizeof(n));
}
if((be = BIO_new_socket(sock, 1)) == NULL) {
logmsg(LOG_WARNING, "(%lx) e503 BIO_new_socket server failed", pthread_self());
shutdown(sock, 2);
close(sock);
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
BIO_set_close(be, BIO_CLOSE);
if(backend->to > 0) {
BIO_set_callback_arg(be, (char *)&backend->to);
BIO_set_callback(be, bio_callback);
}
if(backend->ctx != NULL) {
if((be_ssl = SSL_new(backend->ctx)) == NULL) {
logmsg(LOG_WARNING, "(%lx) be SSL_new: failed", pthread_self());
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
SSL_set_bio(be_ssl, be, be);
if((bb = BIO_new(BIO_f_ssl())) == NULL) {
logmsg(LOG_WARNING, "(%lx) BIO_new(Bio_f_ssl()) failed", pthread_self());
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
BIO_set_ssl(bb, be_ssl, BIO_CLOSE);
BIO_set_ssl_mode(bb, 1);
be = bb;
if(BIO_do_handshake(be) <= 0) {
str_be(buf, MAXBUF - 1, backend);
logmsg(LOG_NOTICE, "BIO_do_handshake with %s failed: %s", buf,
ERR_error_string(ERR_get_error(), NULL));
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
}
if((bb = BIO_new(BIO_f_buffer())) == NULL) {
logmsg(LOG_WARNING, "(%lx) e503 BIO_new(buffer) server failed", pthread_self());
err_reply(cl, h503, lstn->err503);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
BIO_set_buffer_size(bb, MAXBUF);
BIO_set_close(bb, BIO_CLOSE);
be = BIO_push(bb, be);
}
cur_backend = backend;
/* if we have anything but a BACK_END we close the channel */
if(be != NULL && cur_backend->be_type) {
BIO_reset(be);
BIO_free_all(be);
be = NULL;
}
/* send the request */
if(cur_backend->be_type == 0) {
for(n = 0; n < MAXHEADERS && headers[n]; n++) {
if(!headers_ok[n])
continue;
/* this is the earliest we can check for Destination - we had no back-end before */
if(lstn->rewr_dest && check_header(headers[n], buf) == HEADER_DESTINATION) {
if(regexec(&LOCATION, buf, 4, matches, 0)) {
logmsg(LOG_NOTICE, "(%lx) Can't parse Destination %s", pthread_self(), buf);
break;
}
str_be(caddr, MAXBUF - 1, cur_backend);
strcpy(loc_path, buf + matches[3].rm_so);
snprintf(buf, MAXBUF, "Destination: http://%s%s", caddr, loc_path);
free(headers[n]);
if((headers[n] = strdup(buf)) == NULL) {
logmsg(LOG_WARNING, "(%lx) rewrite Destination - out of memory: %s",
pthread_self(), strerror(errno));
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
}
if(BIO_printf(be, "%s\r\n", headers[n]) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write to %s/%s: %s (%.3f sec)",
pthread_self(), buf, request, strerror(errno),
(end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
}
/* add header if required */
if(lstn->add_head != NULL)
if(BIO_printf(be, "%s\r\n", lstn->add_head) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write HTTPSHeader to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
free_headers(headers);
clean_all();
pthread_exit(NULL);
}
}
free_headers(headers);
/* if SSL put additional headers for client certificate */
if(cur_backend->be_type == 0 && ssl != NULL) {
SSL_CIPHER *cipher;
if((cipher = SSL_get_current_cipher(ssl)) != NULL) {
SSL_CIPHER_description(cipher, buf, MAXBUF - 1);
strip_eol(buf);
if(BIO_printf(be, "X-SSL-cipher: %s\r\n", buf) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write X-SSL-cipher to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
clean_all();
pthread_exit(NULL);
}
}
if(lstn->clnt_check > 0 && x509 != NULL && (bb = BIO_new(BIO_s_mem())) != NULL) {
X509_NAME_print_ex(bb, X509_get_subject_name(x509), 8, XN_FLAG_ONELINE & ~ASN1_STRFLGS_ESC_MSB);
get_line(bb, buf, MAXBUF);
if(BIO_printf(be, "X-SSL-Subject: %s\r\n", buf) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write X-SSL-Subject to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
BIO_free_all(bb);
clean_all();
pthread_exit(NULL);
}
X509_NAME_print_ex(bb, X509_get_issuer_name(x509), 8, XN_FLAG_ONELINE & ~ASN1_STRFLGS_ESC_MSB);
get_line(bb, buf, MAXBUF);
if(BIO_printf(be, "X-SSL-Issuer: %s\r\n", buf) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write X-SSL-Issuer to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
BIO_free_all(bb);
clean_all();
pthread_exit(NULL);
}
ASN1_TIME_print(bb, X509_get_notBefore(x509));
get_line(bb, buf, MAXBUF);
if(BIO_printf(be, "X-SSL-notBefore: %s\r\n", buf) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write X-SSL-notBefore to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);
err_reply(cl, h500, lstn->err500);
BIO_free_all(bb);
clean_all();
pthread_exit(NULL);
}
ASN1_TIME_print(bb, X509_get_notAfter(x509));
get_line(bb, buf, MAXBUF);
if(BIO_printf(be, "X-SSL-notAfter: %s\r\n", buf) <= 0) {
str_be(buf, MAXBUF - 1, cur_backend);
end_req = cur_time();
logmsg(LOG_WARNING, "(%lx) e500 error write X-SSL-notAfter to %s: %s (%.3f sec)",
pthread_self(), buf, strerror(errno), (end_req - start_req) / 1000000.0);