blob: 9c6ff0bb23c3bfc433dcdea687cc95b55f830aab [file] [log] [blame]
/*
* Frontend variables and functions.
*
* Copyright 2000-2010 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/standard.h>
#include <common/time.h>
#include <types/global.h>
#include <proto/acl.h>
#include <proto/buffers.h>
#include <proto/fd.h>
#include <proto/frontend.h>
#include <proto/log.h>
#include <proto/hdr_idx.h>
#include <proto/proto_tcp.h>
#include <proto/proto_http.h>
#include <proto/proxy.h>
#include <proto/session.h>
#include <proto/stream_interface.h>
#include <proto/stream_sock.h>
#include <proto/task.h>
/* Retrieves the original destination address used by the client, and sets the
* SN_FRT_ADDR_SET flag.
*/
void get_frt_addr(struct session *s)
{
socklen_t namelen = sizeof(s->si[0].addr.c.to);
if (get_original_dst(s->si[0].fd, (struct sockaddr_in *)&s->si[0].addr.c.to, &namelen) == -1)
getsockname(s->si[0].fd, (struct sockaddr *)&s->si[0].addr.c.to, &namelen);
s->flags |= SN_FRT_ADDR_SET;
}
/* Finish a session accept() for a proxy (TCP or HTTP). It returns a negative
* value in case of a critical failure which must cause the listener to be
* disabled, a positive value in case of success, or zero if it is a success
* but the session must be closed ASAP (eg: monitoring).
*/
int frontend_accept(struct session *s)
{
int cfd = s->si[0].fd;
tv_zero(&s->logs.tv_request);
s->logs.t_queue = -1;
s->logs.t_connect = -1;
s->logs.t_data = -1;
s->logs.t_close = 0;
s->logs.bytes_in = s->logs.bytes_out = 0;
s->logs.prx_queue_size = 0; /* we get the number of pending conns before us */
s->logs.srv_queue_size = 0; /* we will get this number soon */
/* FIXME: the logs are horribly complicated now, because they are
* defined in <p>, <p>, and later <be> and <be>.
*/
if (s->logs.logwait & LW_REQ)
s->do_log = http_sess_log;
else
s->do_log = tcp_sess_log;
/* default error reporting function, may be changed by analysers */
s->srv_error = default_srv_error;
/* Adjust some socket options */
if (s->listener->addr.ss_family == AF_INET || s->listener->addr.ss_family == AF_INET6) {
if (setsockopt(cfd, IPPROTO_TCP, TCP_NODELAY,
(char *) &one, sizeof(one)) == -1)
goto out_return;
if (s->fe->options & PR_O_TCP_CLI_KA)
setsockopt(cfd, SOL_SOCKET, SO_KEEPALIVE,
(char *) &one, sizeof(one));
if (s->fe->options & PR_O_TCP_NOLING)
setsockopt(cfd, SOL_SOCKET, SO_LINGER,
(struct linger *) &nolinger, sizeof(struct linger));
#if defined(TCP_MAXSEG)
if (s->listener->maxseg < 0) {
/* we just want to reduce the current MSS by that value */
int mss;
socklen_t mss_len = sizeof(mss);
if (getsockopt(cfd, IPPROTO_TCP, TCP_MAXSEG, &mss, &mss_len) == 0) {
mss += s->listener->maxseg; /* remember, it's < 0 */
setsockopt(cfd, IPPROTO_TCP, TCP_MAXSEG, &mss, sizeof(mss));
}
}
#endif
}
if (global.tune.client_sndbuf)
setsockopt(cfd, SOL_SOCKET, SO_SNDBUF, &global.tune.client_sndbuf, sizeof(global.tune.client_sndbuf));
if (global.tune.client_rcvbuf)
setsockopt(cfd, SOL_SOCKET, SO_RCVBUF, &global.tune.client_rcvbuf, sizeof(global.tune.client_rcvbuf));
if (s->fe->mode == PR_MODE_HTTP) {
/* the captures are only used in HTTP frontends */
if (unlikely(s->fe->nb_req_cap > 0 &&
(s->txn.req.cap = pool_alloc2(s->fe->req_cap_pool)) == NULL))
goto out_return; /* no memory */
if (unlikely(s->fe->nb_rsp_cap > 0 &&
(s->txn.rsp.cap = pool_alloc2(s->fe->rsp_cap_pool)) == NULL))
goto out_free_reqcap; /* no memory */
}
if (s->fe->acl_requires & ACL_USE_L7_ANY) {
/* we have to allocate header indexes only if we know
* that we may make use of them. This of course includes
* (mode == PR_MODE_HTTP).
*/
s->txn.hdr_idx.size = MAX_HTTP_HDR;
if (unlikely((s->txn.hdr_idx.v = pool_alloc2(s->fe->hdr_idx_pool)) == NULL))
goto out_free_rspcap; /* no memory */
/* and now initialize the HTTP transaction state */
http_init_txn(s);
}
if ((s->fe->mode == PR_MODE_TCP || s->fe->mode == PR_MODE_HTTP)
&& (s->fe->logfac1 >= 0 || s->fe->logfac2 >= 0)) {
if (likely(s->fe->to_log)) {
/* we have the client ip */
if (s->logs.logwait & LW_CLIP)
if (!(s->logs.logwait &= ~LW_CLIP))
s->do_log(s);
}
else if (s->si[0].addr.c.from.ss_family == AF_INET) {
char pn[INET_ADDRSTRLEN], sn[INET_ADDRSTRLEN];
if (!(s->flags & SN_FRT_ADDR_SET))
get_frt_addr(s);
if (inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)&s->si[0].addr.c.to)->sin_addr,
sn, sizeof(sn)) &&
inet_ntop(AF_INET, (const void *)&((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_addr,
pn, sizeof(pn))) {
send_log(s->fe, LOG_INFO, "Connect from %s:%d to %s:%d (%s/%s)\n",
pn, ntohs(((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_port),
sn, ntohs(((struct sockaddr_in *)&s->si[0].addr.c.to)->sin_port),
s->fe->id, (s->fe->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
}
}
else if (s->si[0].addr.c.from.ss_family == AF_INET6) {
char pn[INET6_ADDRSTRLEN], sn[INET6_ADDRSTRLEN];
if (!(s->flags & SN_FRT_ADDR_SET))
get_frt_addr(s);
if (inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)&s->si[0].addr.c.to)->sin6_addr,
sn, sizeof(sn)) &&
inet_ntop(AF_INET6, (const void *)&((struct sockaddr_in6 *)&s->si[0].addr.c.from)->sin6_addr,
pn, sizeof(pn))) {
send_log(s->fe, LOG_INFO, "Connect from %s:%d to %s:%d (%s/%s)\n",
pn, ntohs(((struct sockaddr_in6 *)&s->si[0].addr.c.from)->sin6_port),
sn, ntohs(((struct sockaddr_in6 *)&s->si[0].addr.c.to)->sin6_port),
s->fe->id, (s->fe->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
}
}
else {
/* UNIX socket, only the destination is known */
send_log(s->fe, LOG_INFO, "Connect to unix:%d (%s/%s)\n",
s->listener->luid,
s->fe->id, (s->fe->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
}
}
if (unlikely((global.mode & MODE_DEBUG) && (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
int len;
if (!(s->flags & SN_FRT_ADDR_SET))
get_frt_addr(s);
if (s->si[0].addr.c.from.ss_family == AF_INET) {
char pn[INET_ADDRSTRLEN];
inet_ntop(AF_INET,
(const void *)&((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_addr,
pn, sizeof(pn));
len = sprintf(trash, "%08x:%s.accept(%04x)=%04x from [%s:%d]\n",
s->uniq_id, s->fe->id, (unsigned short)s->listener->fd, (unsigned short)cfd,
pn, ntohs(((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_port));
}
else if (s->si[0].addr.c.from.ss_family == AF_INET6) {
char pn[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6,
(const void *)&((struct sockaddr_in6 *)(&s->si[0].addr.c.from))->sin6_addr,
pn, sizeof(pn));
len = sprintf(trash, "%08x:%s.accept(%04x)=%04x from [%s:%d]\n",
s->uniq_id, s->fe->id, (unsigned short)s->listener->fd, (unsigned short)cfd,
pn, ntohs(((struct sockaddr_in6 *)(&s->si[0].addr.c.from))->sin6_port));
}
else {
len = sprintf(trash, "%08x:%s.accept(%04x)=%04x from [unix:%d]\n",
s->uniq_id, s->fe->id, (unsigned short)s->listener->fd, (unsigned short)cfd,
s->listener->luid);
}
write(1, trash, len);
}
if (s->fe->mode == PR_MODE_HTTP)
s->req->flags |= BF_READ_DONTWAIT; /* one read is usually enough */
/* note: this should not happen anymore since there's always at least the switching rules */
if (!s->req->analysers) {
buffer_auto_connect(s->req); /* don't wait to establish connection */
buffer_auto_close(s->req); /* let the producer forward close requests */
}
s->req->rto = s->fe->timeout.client;
s->rep->wto = s->fe->timeout.client;
fdtab[cfd].flags = FD_FL_TCP | FD_FL_TCP_NODELAY;
if (s->fe->options & PR_O_TCP_NOLING)
fdtab[cfd].flags |= FD_FL_TCP_NOLING;
if (unlikely((s->fe->mode == PR_MODE_HTTP && (s->flags & SN_MONITOR)) ||
(s->fe->mode == PR_MODE_HEALTH && (s->fe->options & PR_O_HTTP_CHK)))) {
/* Either we got a request from a monitoring system on an HTTP instance,
* or we're in health check mode with the 'httpchk' option enabled. In
* both cases, we return a fake "HTTP/1.0 200 OK" response and we exit.
*/
struct chunk msg;
chunk_initstr(&msg, "HTTP/1.0 200 OK\r\n\r\n");
stream_int_retnclose(&s->si[0], &msg); /* forge a 200 response */
s->req->analysers = 0;
s->task->expire = s->rep->wex;
EV_FD_CLR(cfd, DIR_RD);
}
else if (unlikely(s->fe->mode == PR_MODE_HEALTH)) { /* health check mode, no client reading */
struct chunk msg;
chunk_initstr(&msg, "OK\n");
stream_int_retnclose(&s->si[0], &msg); /* forge an "OK" response */
s->req->analysers = 0;
s->task->expire = s->rep->wex;
EV_FD_CLR(cfd, DIR_RD);
}
/* everything's OK, let's go on */
return 1;
/* Error unrolling */
out_free_rspcap:
pool_free2(s->fe->rsp_cap_pool, s->txn.rsp.cap);
out_free_reqcap:
pool_free2(s->fe->req_cap_pool, s->txn.req.cap);
out_return:
return -1;
}
/* This analyser tries to fetch a line from the request buffer which looks like :
*
* "PROXY" <SP> PROTO <SP> SRC3 <SP> DST3 <SP> SRC4 <SP> <DST4> "\r\n"
*
* There must be exactly one space between each field. Fields are :
* - PROTO : layer 4 protocol, which must be "TCP4" or "TCP6".
* - SRC3 : layer 3 (eg: IP) source address in standard text form
* - DST3 : layer 3 (eg: IP) destination address in standard text form
* - SRC4 : layer 4 (eg: TCP port) source address in standard text form
* - DST4 : layer 4 (eg: TCP port) destination address in standard text form
*
* This line MUST be at the beginning of the buffer and MUST NOT wrap.
*
* Once the data is fetched, the values are set in the session's field and data
* are removed from the buffer. The function returns zero if it needs to wait
* for more data (max: timeout_client), or 1 if it has finished and removed itself.
*/
int frontend_decode_proxy_request(struct session *s, struct buffer *req, int an_bit)
{
char *line = req->data;
char *end = req->data + req->l;
int len;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
req->l,
req->analysers);
if (req->flags & (BF_READ_ERROR|BF_READ_TIMEOUT))
goto fail;
len = MIN(req->l, 6);
if (!len)
goto missing;
/* Decode a possible proxy request, fail early if it does not match */
if (strncmp(line, "PROXY ", len) != 0)
goto fail;
line += 6;
if (req->l < 18) /* shortest possible line */
goto missing;
if (!memcmp(line, "TCP4 ", 5) != 0) {
u32 src3, dst3, sport, dport;
line += 5;
src3 = inetaddr_host_lim_ret(line, end, &line);
if (line == end)
goto missing;
if (*line++ != ' ')
goto fail;
dst3 = inetaddr_host_lim_ret(line, end, &line);
if (line == end)
goto missing;
if (*line++ != ' ')
goto fail;
sport = read_uint((const char **)&line, end);
if (line == end)
goto missing;
if (*line++ != ' ')
goto fail;
dport = read_uint((const char **)&line, end);
if (line > end - 2)
goto missing;
if (*line++ != '\r')
goto fail;
if (*line++ != '\n')
goto fail;
/* update the session's addresses and mark them set */
((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_family = AF_INET;
((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_addr.s_addr = htonl(src3);
((struct sockaddr_in *)&s->si[0].addr.c.from)->sin_port = htons(sport);
((struct sockaddr_in *)&s->si[0].addr.c.to)->sin_family = AF_INET;
((struct sockaddr_in *)&s->si[0].addr.c.to)->sin_addr.s_addr = htonl(dst3);
((struct sockaddr_in *)&s->si[0].addr.c.to)->sin_port = htons(dport);
s->flags |= SN_FRT_ADDR_SET;
}
else if (!memcmp(line, "TCP6 ", 5) != 0) {
u32 sport, dport;
char *src_s;
char *dst_s, *sport_s, *dport_s;
struct in6_addr src3, dst3;
line+=5;
src_s = line;
dst_s = sport_s = dport_s = NULL;
while (1) {
if (line > end - 2) {
goto missing;
}
else if (*line == '\r') {
*line = 0;
line++;
if (*line++ != '\n')
goto fail;
break;
}
if (*line == ' ') {
*line = 0;
if (!dst_s)
dst_s = line+1;
else if (!sport_s)
sport_s = line+1;
else if (!dport_s)
dport_s = line+1;
}
line++;
}
if (!dst_s || !sport_s || !dport_s)
goto fail;
sport = read_uint((const char **)&sport_s,dport_s-1);
if ( *sport_s != 0 )
goto fail;
dport = read_uint((const char **)&dport_s,line-2);
if ( *dport_s != 0 )
goto fail;
if (inet_pton(AF_INET6, src_s, (void *)&src3) != 1)
goto fail;
if (inet_pton(AF_INET6, dst_s, (void *)&dst3) != 1)
goto fail;
/* update the session's addresses and mark them set */
((struct sockaddr_in6 *)&s->si[0].addr.c.from)->sin6_family = AF_INET6;
memcpy(&((struct sockaddr_in6 *)&s->si[0].addr.c.from)->sin6_addr, &src3, sizeof(struct in6_addr));
((struct sockaddr_in6 *)&s->si[0].addr.c.from)->sin6_port = htons(sport);
((struct sockaddr_in6 *)&s->si[0].addr.c.to)->sin6_family = AF_INET6;
memcpy(&((struct sockaddr_in6 *)&s->si[0].addr.c.to)->sin6_addr, &dst3, sizeof(struct in6_addr));
((struct sockaddr_in6 *)&s->si[0].addr.c.to)->sin6_port = htons(dport);
s->flags |= SN_FRT_ADDR_SET;
}
else {
goto fail;
}
/* remove the PROXY line from the request */
len = line - req->data;
buffer_replace2(req, req->data, line, NULL, 0);
req->total -= len; /* don't count the header line */
req->analysers &= ~an_bit;
return 1;
missing:
if (!(req->flags & (BF_SHUTR|BF_FULL))) {
buffer_dont_connect(s->req);
return 0;
}
/* missing data and buffer is either full or shutdown => fail */
fail:
buffer_abort(req);
buffer_abort(s->rep);
req->analysers = 0;
s->fe->counters.failed_req++;
if (s->listener->counters)
s->listener->counters->failed_req++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_PRXCOND;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_R;
return 0;
}
/* set test->i to the id of the frontend */
static int
acl_fetch_fe_id(struct proxy *px, struct session *l4, void *l7, int dir,
struct acl_expr *expr, struct acl_test *test) {
test->flags = ACL_TEST_F_READ_ONLY;
test->i = l4->fe->uuid;
return 1;
}
/* set test->i to the number of connections per second reaching the frontend */
static int
acl_fetch_fe_sess_rate(struct proxy *px, struct session *l4, void *l7, int dir,
struct acl_expr *expr, struct acl_test *test)
{
test->flags = ACL_TEST_F_VOL_TEST;
if (expr->arg_len) {
/* another proxy was designated, we must look for it */
for (px = proxy; px; px = px->next)
if ((px->cap & PR_CAP_FE) && !strcmp(px->id, expr->arg.str))
break;
}
if (!px)
return 0;
test->i = read_freq_ctr(&px->fe_sess_per_sec);
return 1;
}
/* set test->i to the number of concurrent connections on the frontend */
static int
acl_fetch_fe_conn(struct proxy *px, struct session *l4, void *l7, int dir,
struct acl_expr *expr, struct acl_test *test)
{
test->flags = ACL_TEST_F_VOL_TEST;
if (expr->arg_len) {
/* another proxy was designated, we must look for it */
for (px = proxy; px; px = px->next)
if ((px->cap & PR_CAP_FE) && !strcmp(px->id, expr->arg.str))
break;
}
if (!px)
return 0;
test->i = px->feconn;
return 1;
}
/* Note: must not be declared <const> as its list will be overwritten */
static struct acl_kw_list acl_kws = {{ },{
{ "fe_id", acl_parse_int, acl_fetch_fe_id, acl_match_int, ACL_USE_NOTHING },
{ "fe_sess_rate", acl_parse_int, acl_fetch_fe_sess_rate, acl_match_int, ACL_USE_NOTHING },
{ "fe_conn", acl_parse_int, acl_fetch_fe_conn, acl_match_int, ACL_USE_NOTHING },
{ NULL, NULL, NULL, NULL },
}};
__attribute__((constructor))
static void __frontend_init(void)
{
acl_register_keywords(&acl_kws);
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/