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lighttpd2/src/modules/mod_fastcgi.c

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/*
* mod_fastcgi - connect to fastcgi backends for generating content
*
* Description:
* mod_fastcgi connects to a backend over tcp or unix sockets
*
* Setups:
* none
* Options:
* fastcgi.log_plain_errors <value> - whether to prepend timestamp and other info to
* fastcgi stderr lines in the "backend" log.
* type: boolean
* Actions:
* fastcgi <socket> - connect to backend at <socket>
* socket: string, either "ip:port" or "unix:/path"
*
* Example config:
* fastcgi "127.0.0.1:9090"
*
* Todo:
* - reuse fastcgi connections (keepalive)
* - option for alternative doc-root?
*
* Author:
* Copyright (c) 2009 Stefan Bühler
*/
#include <lighttpd/base.h>
#include <lighttpd/plugin_core.h>
enum fastcgi_options_t {
FASTCGI_OPTION_LOG_PLAIN_ERRORS = 0,
};
LI_API gboolean mod_fastcgi_init(liModules *mods, liModule *mod);
LI_API gboolean mod_fastcgi_free(liModules *mods, liModule *mod);
typedef struct fastcgi_connection fastcgi_connection;
typedef struct fastcgi_context fastcgi_context;
typedef struct FCGI_Record FCGI_Record;
typedef enum {
FS_WAIT_FOR_REQUEST,
FS_CONNECT,
FS_CONNECTING,
FS_CONNECTED,
FS_DONE
} fastcgi_state;
struct FCGI_Record {
guint8 version;
guint8 type;
guint16 requestID;
guint16 contentLength;
guint8 paddingLength;
gint remainingContent, remainingPadding;
gboolean valid, first;
};
struct fastcgi_connection {
fastcgi_context *ctx;
liVRequest *vr;
fastcgi_state state;
int fd;
ev_io fd_watcher;
liChunkQueue *fcgi_in, *fcgi_out, *stdout;
liBuffer *fcgi_in_buffer;
GByteArray *buf_in_record;
FCGI_Record fcgi_in_record;
guint16 requestid;
liHttpResponseCtx parse_response_ctx;
gboolean response_headers_finished;
};
struct fastcgi_context {
gint refcount;
liSocketAddress socket;
GString *socket_str;
guint timeout;
liPlugin *plugin;
gint last_errno;
};
/* fastcgi types */
#define FCGI_VERSION_1 1
#define FCGI_HEADER_LEN 8
enum FCGI_Type {
FCGI_BEGIN_REQUEST = 1,
FCGI_ABORT_REQUEST = 2,
FCGI_END_REQUEST = 3,
FCGI_PARAMS = 4,
FCGI_STDIN = 5,
FCGI_STDOUT = 6,
FCGI_STDERR = 7,
FCGI_DATA = 8,
FCGI_GET_VALUES = 9,
FCGI_GET_VALUES_RESULT = 10,
FCGI_UNKNOWN_TYPE = 11
};
#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE)
enum FCGI_Flags {
FCGI_KEEP_CONN = 1
};
enum FCGI_Role {
FCGI_RESPONDER = 1,
FCGI_AUTHORIZER = 2,
FCGI_FILTER = 3
};
enum FCGI_ProtocolStatus {
FCGI_REQUEST_COMPLETE = 0,
FCGI_CANT_MPX_CONN = 1,
FCGI_OVERLOADED = 2,
FCGI_UNKNOWN_ROLE = 3
};
/**********************************************************************************/
static fastcgi_context* fastcgi_context_new(liServer *srv, liPlugin *p, GString *dest_socket) {
liSocketAddress saddr;
fastcgi_context* ctx;
saddr = li_sockaddr_from_string(dest_socket, 0);
if (NULL == saddr.addr) {
ERROR(srv, "Invalid socket address '%s'", dest_socket->str);
return NULL;
}
ctx = g_slice_new0(fastcgi_context);
ctx->refcount = 1;
ctx->socket = saddr;
ctx->timeout = 5;
ctx->plugin = p;
ctx->socket_str = g_string_new_len(GSTR_LEN(dest_socket));
return ctx;
}
static void fastcgi_context_release(fastcgi_context *ctx) {
if (!ctx) return;
assert(g_atomic_int_get(&ctx->refcount) > 0);
if (g_atomic_int_dec_and_test(&ctx->refcount)) {
li_sockaddr_clear(&ctx->socket);
g_string_free(ctx->socket_str, TRUE);
g_slice_free(fastcgi_context, ctx);
}
}
static void fastcgi_context_acquire(fastcgi_context *ctx) {
assert(g_atomic_int_get(&ctx->refcount) > 0);
g_atomic_int_inc(&ctx->refcount);
}
static void fastcgi_fd_cb(struct ev_loop *loop, ev_io *w, int revents);
static fastcgi_connection* fastcgi_connection_new(liVRequest *vr, fastcgi_context *ctx) {
fastcgi_connection* fcon = g_slice_new0(fastcgi_connection);
fastcgi_context_acquire(ctx);
fcon->ctx = ctx;
fcon->vr = vr;
fcon->fd = -1;
ev_init(&fcon->fd_watcher, fastcgi_fd_cb);
ev_io_set(&fcon->fd_watcher, -1, 0);
fcon->fd_watcher.data = fcon;
fcon->fcgi_in = li_chunkqueue_new();
fcon->fcgi_out = li_chunkqueue_new();
fcon->stdout = li_chunkqueue_new();
fcon->buf_in_record = g_byte_array_sized_new(FCGI_HEADER_LEN);
fcon->requestid = 1;
fcon->state = FS_WAIT_FOR_REQUEST;
li_http_response_parser_init(&fcon->parse_response_ctx, &vr->response, fcon->stdout, TRUE, FALSE);
fcon->response_headers_finished = FALSE;
return fcon;
}
static void fastcgi_connection_free(fastcgi_connection *fcon) {
liVRequest *vr;
if (!fcon) return;
vr = fcon->vr;
ev_io_stop(vr->wrk->loop, &fcon->fd_watcher);
fastcgi_context_release(fcon->ctx);
if (fcon->fd != -1) close(fcon->fd);
li_vrequest_backend_finished(vr);
li_chunkqueue_free(fcon->fcgi_in);
li_chunkqueue_free(fcon->fcgi_out);
li_chunkqueue_free(fcon->stdout);
li_buffer_release(fcon->fcgi_in_buffer);
g_byte_array_free(fcon->buf_in_record, TRUE);
li_http_response_parser_clear(&fcon->parse_response_ctx);
g_slice_free(fastcgi_connection, fcon);
}
/**********************************************************************************/
/* fastcgi stream helper */
static const gchar __padding[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static void append_padding(GByteArray *a, guint8 padlen) {
g_byte_array_append(a, (guint8*) __padding, padlen);
}
static void l_byte_array_append_c(GByteArray *a, char c) {
g_byte_array_append(a, (guint8*) &c, 1);
}
/* returns padding length */
static guint8 stream_build_fcgi_record(GByteArray *buf, guint8 type, guint16 requestid, guint16 datalen) {
guint16 w;
guint8 padlen = (8 - (datalen & 0x7)) % 8; /* padding must be < 8 */
g_byte_array_set_size(buf, FCGI_HEADER_LEN);
g_byte_array_set_size(buf, 0);
l_byte_array_append_c(buf, FCGI_VERSION_1);
l_byte_array_append_c(buf, type);
w = htons(requestid);
g_byte_array_append(buf, (const guint8*) &w, sizeof(w));
w = htons(datalen);
g_byte_array_append(buf, (const guint8*) &w, sizeof(w));
l_byte_array_append_c(buf, padlen);
l_byte_array_append_c(buf, 0);
return padlen;
}
/* returns padding length */
static guint8 stream_send_fcgi_record(liChunkQueue *out, guint8 type, guint16 requestid, guint16 datalen) {
GByteArray *record = g_byte_array_sized_new(FCGI_HEADER_LEN);
guint8 padlen = stream_build_fcgi_record(record, type, requestid, datalen);
li_chunkqueue_append_bytearr(out, record);
return padlen;
}
static void stream_send_data(liChunkQueue *out, guint8 type, guint16 requestid, const gchar *data, size_t datalen) {
while (datalen > 0) {
guint16 tosend = (datalen > G_MAXUINT16) ? G_MAXUINT16 : datalen;
guint8 padlen = stream_send_fcgi_record(out, type, requestid, tosend);
GByteArray *tmpa = g_byte_array_sized_new(tosend + padlen);
g_byte_array_append(tmpa, (const guint8*) data, tosend);
append_padding(tmpa, padlen);
li_chunkqueue_append_bytearr(out, tmpa);
data += tosend;
datalen -= tosend;
}
}
/* kills the data */
static void stream_send_bytearr(liChunkQueue *out, guint8 type, guint16 requestid, GByteArray *data) {
if (data->len > G_MAXUINT16) {
stream_send_data(out, type, requestid, (const gchar*) data->data, data->len);
g_byte_array_free(data, TRUE);
} else {
guint8 padlen = stream_send_fcgi_record(out, type, requestid, data->len);
append_padding(data, padlen);
li_chunkqueue_append_bytearr(out, data);
}
}
static void stream_send_chunks(liChunkQueue *out, guint8 type, guint16 requestid, liChunkQueue *in) {
while (in->length > 0) {
guint16 tosend = (in->length > G_MAXUINT16) ? G_MAXUINT16 : in->length;
guint8 padlen = stream_send_fcgi_record(out, type, requestid, tosend);
li_chunkqueue_steal_len(out, in, tosend);
li_chunkqueue_append_mem(out, __padding, padlen);
}
if (in->is_closed && !out->is_closed) {
out->is_closed = TRUE;
stream_send_fcgi_record(out, type, requestid, 0);
}
}
static gboolean _append_ba_len(GByteArray *a, size_t len) {
if (len > G_MAXINT32) return FALSE;
if (len > 127) {
guint32 i = htonl(len | (1 << 31));
g_byte_array_append(a, (const guint8*) &i, sizeof(i));
} else {
l_byte_array_append_c(a, (guint8) len);
}
return TRUE;
}
static gboolean append_key_value_pair(GByteArray *a, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
if (!_append_ba_len(a, keylen) || !_append_ba_len(a, valuelen)) return FALSE;
g_byte_array_append(a, (const guint8*) key, keylen);
g_byte_array_append(a, (const guint8*) val, valuelen);
return TRUE;
}
/**********************************************************************************/
static void fastcgi_send_begin(fastcgi_connection *fcon) {
GByteArray *buf = g_byte_array_sized_new(16);
guint16 w;
stream_build_fcgi_record(buf, FCGI_BEGIN_REQUEST, fcon->requestid, 8);
w = htons(FCGI_RESPONDER);
g_byte_array_append(buf, (const guint8*) &w, sizeof(w));
l_byte_array_append_c(buf, 0); /* TODO: FCGI_KEEP_CONN */
append_padding(buf, 5);
li_chunkqueue_append_bytearr(fcon->fcgi_out, buf);
}
static void fastcgi_env_add(GByteArray *buf, liEnvironmentDup *envdup, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
GString *sval;
if (NULL != (sval = li_environment_dup_pop(envdup, key, keylen))) {
append_key_value_pair(buf, key, keylen, GSTR_LEN(sval));
} else {
append_key_value_pair(buf, key, keylen, val, valuelen);
}
}
static void fastcgi_env_create(liVRequest *vr, liEnvironmentDup *envdup, GByteArray* buf) {
liConInfo *coninfo = vr->coninfo;
GString *tmp = vr->wrk->tmp_str;
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_SOFTWARE"), GSTR_LEN(CORE_OPTIONPTR(LI_CORE_OPTION_SERVER_TAG).string));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_NAME"), GSTR_LEN(vr->request.uri.host));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("GATEWAY_INTERFACE"), CONST_STR_LEN("CGI/1.1"));
{
guint port = 0;
switch (coninfo->local_addr.addr->plain.sa_family) {
case AF_INET: port = coninfo->local_addr.addr->ipv4.sin_port; break;
#ifdef HAVE_IPV6
case AF_INET6: port = coninfo->local_addr.addr->ipv6.sin6_port; break;
#endif
}
if (port) {
g_string_printf(tmp, "%u", htons(port));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PORT"), GSTR_LEN(tmp));
}
}
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_ADDR"), GSTR_LEN(coninfo->local_addr_str));
{
guint port = 0;
switch (coninfo->remote_addr.addr->plain.sa_family) {
case AF_INET: port = coninfo->remote_addr.addr->ipv4.sin_port; break;
#ifdef HAVE_IPV6
case AF_INET6: port = coninfo->remote_addr.addr->ipv6.sin6_port; break;
#endif
}
if (port) {
g_string_printf(tmp, "%u", htons(port));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REMOTE_PORT"), GSTR_LEN(tmp));
}
}
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REMOTE_ADDR"), GSTR_LEN(coninfo->remote_addr_str));
if (vr->request.content_length > 0) {
g_string_printf(tmp, "%" L_GOFFSET_MODIFIER "i", vr->request.content_length);
fastcgi_env_add(buf, envdup, CONST_STR_LEN("CONTENT_LENGTH"), GSTR_LEN(tmp));
}
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SCRIPT_NAME"), GSTR_LEN(vr->request.uri.path));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("PATH_INFO"), GSTR_LEN(vr->physical.pathinfo));
if (vr->physical.pathinfo->len) {
g_string_truncate(tmp, 0);
g_string_append_len(tmp, GSTR_LEN(vr->physical.doc_root)); /* TODO: perhaps an option for alternative doc-root? */
g_string_append_len(tmp, GSTR_LEN(vr->physical.pathinfo));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("PATH_TRANSLATED"), GSTR_LEN(tmp));
}
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SCRIPT_FILENAME"), GSTR_LEN(vr->physical.path));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("DOCUMENT_ROOT"), GSTR_LEN(vr->physical.doc_root));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REQUEST_URI"), GSTR_LEN(vr->request.uri.raw_orig_path));
if (!g_string_equal(vr->request.uri.raw_orig_path, vr->request.uri.raw_path)) {
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REDIRECT_URI"), GSTR_LEN(vr->request.uri.raw_path));
}
fastcgi_env_add(buf, envdup, CONST_STR_LEN("QUERY_STRING"), GSTR_LEN(vr->request.uri.query));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REQUEST_METHOD"), GSTR_LEN(vr->request.http_method_str));
fastcgi_env_add(buf, envdup, CONST_STR_LEN("REDIRECT_STATUS"), CONST_STR_LEN("200")); /* if php is compiled with --force-redirect */
switch (vr->request.http_version) {
case LI_HTTP_VERSION_1_1:
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PROTOCOL"), CONST_STR_LEN("HTTP/1.1"));
break;
case LI_HTTP_VERSION_1_0:
default:
fastcgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PROTOCOL"), CONST_STR_LEN("HTTP/1.0"));
break;
}
if (coninfo->is_ssl) {
fastcgi_env_add(buf, envdup, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on"));
}
}
static void fix_header_name(GString *str) {
guint i, len = str->len;
gchar *s = str->str;
for (i = 0; i < len; i++) {
if (g_ascii_isalpha(s[i])) {
s[i] = g_ascii_toupper(s[i]);
} else if (!g_ascii_isdigit(s[i])) {
s[i] = '_';
}
}
}
static void fastcgi_send_env(liVRequest *vr, fastcgi_connection *fcon) {
GByteArray *buf = g_byte_array_sized_new(0);
liEnvironmentDup *envdup;
envdup = li_environment_make_dup(&vr->env);
fastcgi_env_create(vr, envdup, buf);
{
GList *i;
GString *tmp = vr->wrk->tmp_str;
for (i = vr->request.headers->entries.head; NULL != i; i = i->next) {
liHttpHeader *h = (liHttpHeader*) i->data;
const GString hkey = li_const_gstring(h->data->str, h->keylen);
g_string_truncate(tmp, 0);
if (!li_strncase_equal(&hkey, CONST_STR_LEN("CONTENT-TYPE"))) {
g_string_append_len(tmp, CONST_STR_LEN("HTTP_"));
}
g_string_append_len(tmp, h->data->str, h->keylen);
fix_header_name(tmp);
fastcgi_env_add(buf, envdup, GSTR_LEN(tmp), h->data->str + h->keylen+2, h->data->len - (h->keylen+2));
}
}
{
GHashTableIter i;
gpointer key, val;
g_hash_table_iter_init(&i, envdup->table);
while (g_hash_table_iter_next(&i, &key, &val)) {
append_key_value_pair(buf, GSTR_LEN((GString*) key), GSTR_LEN((GString*) val));
}
}
li_environment_dup_free(envdup);
stream_send_bytearr(fcon->fcgi_out, FCGI_PARAMS, fcon->requestid, buf);
stream_send_fcgi_record(fcon->fcgi_out, FCGI_PARAMS, fcon->requestid, 0);
}
static void fastcgi_forward_request(liVRequest *vr, fastcgi_connection *fcon) {
stream_send_chunks(fcon->fcgi_out, FCGI_STDIN, fcon->requestid, vr->in);
if (fcon->fcgi_out->length > 0)
li_ev_io_add_events(vr->wrk->loop, &fcon->fd_watcher, EV_WRITE);
}
static gboolean fastcgi_get_packet(fastcgi_connection *fcon) {
const unsigned char *data;
/* already got packet */
if (fcon->fcgi_in_record.valid) {
if (0 == fcon->fcgi_in_record.remainingContent) {
/* wait for padding data ? */
gint len = fcon->fcgi_in->length;
if (len > fcon->fcgi_in_record.remainingPadding) len = fcon->fcgi_in_record.remainingPadding;
li_chunkqueue_skip(fcon->fcgi_in, len);
fcon->fcgi_in_record.remainingPadding -= len;
if (0 != fcon->fcgi_in_record.remainingPadding) return FALSE; /* wait for data */
fcon->fcgi_in_record.valid = FALSE; /* read next packet */
} else {
return (fcon->fcgi_in->length > 0); /* wait for/handle more content */
}
}
if (!li_chunkqueue_extract_to_bytearr(fcon->vr, fcon->fcgi_in, FCGI_HEADER_LEN, fcon->buf_in_record)) return FALSE; /* need more data */
data = (const unsigned char*) fcon->buf_in_record->data;
fcon->fcgi_in_record.version = data[0];
fcon->fcgi_in_record.type = data[1];
fcon->fcgi_in_record.requestID = (data[2] << 8) | (data[3]);
fcon->fcgi_in_record.contentLength = (data[4] << 8) | (data[5]);
fcon->fcgi_in_record.paddingLength = data[6];
fcon->fcgi_in_record.remainingContent = fcon->fcgi_in_record.contentLength;
fcon->fcgi_in_record.remainingPadding = fcon->fcgi_in_record.paddingLength;
fcon->fcgi_in_record.valid = TRUE;
fcon->fcgi_in_record.first = TRUE;
li_chunkqueue_skip(fcon->fcgi_in, FCGI_HEADER_LEN);
return TRUE;
}
/* get available data and mark it as read (subtract it from contentLength) */
static int fastcgi_available(fastcgi_connection *fcon) {
gint len = fcon->fcgi_in->length;
if (len > fcon->fcgi_in_record.remainingContent) len = fcon->fcgi_in_record.remainingContent;
fcon->fcgi_in_record.remainingContent -= len;
return len;
}
static gboolean fastcgi_parse_response(fastcgi_connection *fcon) {
liVRequest *vr = fcon->vr;
liPlugin *p = fcon->ctx->plugin;
gint len;
while (fastcgi_get_packet(fcon)) {
if (fcon->fcgi_in_record.version != FCGI_VERSION_1) {
VR_ERROR(vr, "(%s) Unknown fastcgi protocol version %i", fcon->ctx->socket_str->str, (gint) fcon->fcgi_in_record.version);
close(fcon->fd);
fcon->fd = -1;
li_vrequest_error(vr);
return FALSE;
}
switch (fcon->fcgi_in_record.type) {
case FCGI_END_REQUEST:
li_chunkqueue_skip(fcon->fcgi_in, fastcgi_available(fcon));
fcon->stdout->is_closed = TRUE;
break;
case FCGI_STDOUT:
if (0 == fcon->fcgi_in_record.contentLength) {
fcon->stdout->is_closed = TRUE;
} else {
li_chunkqueue_steal_len(fcon->stdout, fcon->fcgi_in, fastcgi_available(fcon));
}
break;
case FCGI_STDERR:
len = fastcgi_available(fcon);
li_chunkqueue_extract_to(vr, fcon->fcgi_in, len, vr->wrk->tmp_str);
if (OPTION(FASTCGI_OPTION_LOG_PLAIN_ERRORS).boolean) {
li_log_split_lines(vr->wrk->srv, vr, LI_LOG_LEVEL_BACKEND, 0, vr->wrk->tmp_str->str, "");
} else {
VR_BACKEND_LINES(vr, vr->wrk->tmp_str->str, "(fcgi-stderr %s) ", fcon->ctx->socket_str->str);
}
li_chunkqueue_skip(fcon->fcgi_in, len);
break;
default:
if (fcon->fcgi_in_record.first) VR_WARNING(vr, "(%s) Unhandled fastcgi record type %i", fcon->ctx->socket_str->str, (gint) fcon->fcgi_in_record.type);
li_chunkqueue_skip(fcon->fcgi_in, fastcgi_available(fcon));
break;
}
fcon->fcgi_in_record.first = FALSE;
}
return TRUE;
}
/**********************************************************************************/
static liHandlerResult fastcgi_statemachine(liVRequest *vr, fastcgi_connection *fcon);
static void fastcgi_fd_cb(struct ev_loop *loop, ev_io *w, int revents) {
fastcgi_connection *fcon = (fastcgi_connection*) w->data;
if (fcon->state == FS_CONNECTING) {
if (LI_HANDLER_GO_ON != fastcgi_statemachine(fcon->vr, fcon)) {
li_vrequest_error(fcon->vr);
}
return;
}
if (revents & EV_READ) {
if (fcon->fcgi_in->is_closed) {
li_ev_io_rem_events(loop, w, EV_READ);
} else {
switch (li_network_read(fcon->vr, w->fd, fcon->fcgi_in, &fcon->fcgi_in_buffer)) {
case LI_NETWORK_STATUS_SUCCESS:
break;
case LI_NETWORK_STATUS_FATAL_ERROR:
VR_ERROR(fcon->vr, "(%s) network read fatal error", fcon->ctx->socket_str->str);
li_vrequest_error(fcon->vr);
return;
case LI_NETWORK_STATUS_CONNECTION_CLOSE:
fcon->fcgi_in->is_closed = TRUE;
ev_io_stop(loop, w);
close(fcon->fd);
fcon->fd = -1;
li_vrequest_backend_finished(fcon->vr);
break;
case LI_NETWORK_STATUS_WAIT_FOR_EVENT:
break;
}
}
}
if (fcon->fd != -1 && (revents & EV_WRITE)) {
if (fcon->fcgi_out->length > 0) {
switch (li_network_write(fcon->vr, w->fd, fcon->fcgi_out, 256*1024)) {
case LI_NETWORK_STATUS_SUCCESS:
break;
case LI_NETWORK_STATUS_FATAL_ERROR:
VR_ERROR(fcon->vr, "(%s) network write fatal error", fcon->ctx->socket_str->str);
li_vrequest_error(fcon->vr);
return;
case LI_NETWORK_STATUS_CONNECTION_CLOSE:
fcon->fcgi_in->is_closed = TRUE;
ev_io_stop(loop, w);
close(fcon->fd);
fcon->fd = -1;
li_vrequest_backend_finished(fcon->vr);
break;
case LI_NETWORK_STATUS_WAIT_FOR_EVENT:
break;
}
}
if (fcon->fcgi_out->length == 0) {
li_ev_io_rem_events(loop, w, EV_WRITE);
}
}
if (!fastcgi_parse_response(fcon)) return;
if (!fcon->response_headers_finished) {
switch (li_http_response_parse(fcon->vr, &fcon->parse_response_ctx)) {
case LI_HANDLER_GO_ON:
fcon->response_headers_finished = TRUE;
li_vrequest_handle_response_headers(fcon->vr);
break;
case LI_HANDLER_ERROR:
VR_ERROR(fcon->vr, "Parsing response header failed for: %s", fcon->ctx->socket_str->str);
li_vrequest_error(fcon->vr);
break;
default:
break;
}
}
if (fcon->response_headers_finished) {
li_chunkqueue_steal_all(fcon->vr->out, fcon->stdout);
fcon->vr->out->is_closed = fcon->stdout->is_closed;
li_vrequest_handle_response_body(fcon->vr);
}
if (fcon->fcgi_in->is_closed && !fcon->vr->out->is_closed) {
VR_ERROR(fcon->vr, "(%s) unexpected end-of-file (perhaps the fastcgi process died)", fcon->ctx->socket_str->str);
li_vrequest_error(fcon->vr);
}
}
/**********************************************************************************/
/* state machine */
static void fastcgi_close(liVRequest *vr, liPlugin *p);
static liHandlerResult fastcgi_statemachine(liVRequest *vr, fastcgi_connection *fcon) {
liPlugin *p = fcon->ctx->plugin;
switch (fcon->state) {
case FS_WAIT_FOR_REQUEST:
/* wait until we have either all data or the cqlimit is full */
if (-1 == vr->request.content_length || vr->request.content_length != vr->in->length) {
if (0 != li_chunkqueue_limit_available(vr->in))
return LI_HANDLER_GO_ON;
}
fcon->state = FS_CONNECT;
/* fall through */
case FS_CONNECT:
do {
fcon->fd = socket(fcon->ctx->socket.addr->plain.sa_family, SOCK_STREAM, 0);
} while (-1 == fcon->fd && errno == EINTR);
if (-1 == fcon->fd) {
if (errno == EMFILE) {
li_server_out_of_fds(vr->wrk->srv);
} else if (errno != g_atomic_int_get(&fcon->ctx->last_errno)) {
g_atomic_int_set(&fcon->ctx->last_errno, errno);
VR_ERROR(vr, "Couldn't open socket: %s", g_strerror(errno));
}
return LI_HANDLER_ERROR;
}
li_fd_init(fcon->fd);
ev_io_set(&fcon->fd_watcher, fcon->fd, EV_READ | EV_WRITE);
ev_io_start(vr->wrk->loop, &fcon->fd_watcher);
/* fall through */
case FS_CONNECTING:
if (-1 == connect(fcon->fd, &fcon->ctx->socket.addr->plain, fcon->ctx->socket.len)) {
switch (errno) {
case EINPROGRESS:
case EALREADY:
case EINTR:
fcon->state = FS_CONNECTING;
return LI_HANDLER_GO_ON;
case EAGAIN: /* backend overloaded */
fastcgi_close(vr, p);
li_vrequest_backend_overloaded(vr);
return LI_HANDLER_GO_ON;
default:
if (errno != g_atomic_int_get(&fcon->ctx->last_errno)) {
g_atomic_int_set(&fcon->ctx->last_errno, errno);
VR_ERROR(vr, "Couldn't connect to '%s': %s",
li_sockaddr_to_string(fcon->ctx->socket, vr->wrk->tmp_str, TRUE)->str,
g_strerror(errno));
}
fastcgi_close(vr, p);
li_vrequest_backend_dead(vr);
return LI_HANDLER_GO_ON;
}
}
g_atomic_int_set(&fcon->ctx->last_errno, 0);
fcon->state = FS_CONNECTED;
/* prepare stream */
fastcgi_send_begin(fcon);
fastcgi_send_env(vr, fcon);
/* fall through */
case FS_CONNECTED:
fastcgi_forward_request(vr, fcon);
break;
case FS_DONE:
break;
}
return LI_HANDLER_GO_ON;
}
/**********************************************************************************/
static liHandlerResult fastcgi_handle(liVRequest *vr, gpointer param, gpointer *context) {
fastcgi_context *ctx = (fastcgi_context*) param;
fastcgi_connection *fcon;
UNUSED(context);
if (!li_vrequest_handle_indirect(vr, ctx->plugin)) return LI_HANDLER_GO_ON;
fcon = fastcgi_connection_new(vr, ctx);
if (!fcon) {
return LI_HANDLER_ERROR;
}
g_ptr_array_index(vr->plugin_ctx, ctx->plugin->id) = fcon;
li_chunkqueue_set_limit(fcon->fcgi_in, vr->out->limit);
li_chunkqueue_set_limit(fcon->stdout, vr->out->limit);
li_chunkqueue_set_limit(fcon->fcgi_out, vr->in->limit);
if (vr->out->limit) vr->out->limit->io_watcher = &fcon->fd_watcher;
return fastcgi_statemachine(vr, fcon);
}
static liHandlerResult fastcgi_handle_request_body(liVRequest *vr, liPlugin *p) {
fastcgi_connection *fcon = (fastcgi_connection*) g_ptr_array_index(vr->plugin_ctx, p->id);
if (!fcon) return LI_HANDLER_ERROR;
return fastcgi_statemachine(vr, fcon);
}
static void fastcgi_close(liVRequest *vr, liPlugin *p) {
fastcgi_connection *fcon = (fastcgi_connection*) g_ptr_array_index(vr->plugin_ctx, p->id);
g_ptr_array_index(vr->plugin_ctx, p->id) = NULL;
if (fcon) {
if (vr->out->limit) vr->out->limit->io_watcher = NULL;
fastcgi_connection_free(fcon);
}
}
static void fastcgi_free(liServer *srv, gpointer param) {
fastcgi_context *ctx = (fastcgi_context*) param;
UNUSED(srv);
fastcgi_context_release(ctx);
}
static liAction* fastcgi_create(liServer *srv, liWorker *wrk, liPlugin* p, liValue *val, gpointer userdata) {
fastcgi_context *ctx;
UNUSED(wrk); UNUSED(userdata);
if (val->type != LI_VALUE_STRING) {
ERROR(srv, "%s", "fastcgi expects a string as parameter");
return FALSE;
}
ctx = fastcgi_context_new(srv, p, val->data.string);
if (!ctx) return NULL;
return li_action_new_function(fastcgi_handle, NULL, fastcgi_free, ctx);
}
static const liPluginOption options[] = {
{ "fastcgi.log_plain_errors", LI_VALUE_BOOLEAN, FALSE, NULL },
{ NULL, 0, 0, NULL }
};
static const liPluginAction actions[] = {
{ "fastcgi", fastcgi_create, NULL },
{ NULL, NULL, NULL }
};
static const liPluginSetup setups[] = {
{ NULL, NULL, NULL }
};
static void plugin_init(liServer *srv, liPlugin *p, gpointer userdata) {
UNUSED(srv); UNUSED(userdata);
p->options = options;
p->actions = actions;
p->setups = setups;
p->handle_request_body = fastcgi_handle_request_body;
p->handle_vrclose = fastcgi_close;
}
gboolean mod_fastcgi_init(liModules *mods, liModule *mod) {
MODULE_VERSION_CHECK(mods);
mod->config = li_plugin_register(mods->main, "mod_fastcgi", plugin_init, NULL);
return mod->config != NULL;
}
gboolean mod_fastcgi_free(liModules *mods, liModule *mod) {
if (mod->config)
li_plugin_free(mods->main, mod->config);
return TRUE;
}