lighttpd 1.4.x https://www.lighttpd.net/
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#include "buffer.h"
#include "server.h"
#include "keyvalue.h"
#include "log.h"
#include "http_chunk.h"
#include "fdevent.h"
#include "connections.h"
#include "response.h"
#include "joblist.h"
#include "plugin.h"
#include "inet_ntop_cache.h"
#include "stat_cache.h"
#include "status_counter.h"
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <signal.h>
#ifdef HAVE_FASTCGI_FASTCGI_H
# include <fastcgi/fastcgi.h>
#else
# ifdef HAVE_FASTCGI_H
# include <fastcgi.h>
# else
# include "fastcgi.h"
# endif
#endif /* HAVE_FASTCGI_FASTCGI_H */
#include <stdio.h>
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#include "sys-socket.h"
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include "version.h"
#define FCGI_ENV_ADD_CHECK(ret, con) \
if (ret == -1) { \
con->http_status = 400; \
con->file_finished = 1; \
return -1; \
};
/*
*
* TODO:
*
* - add timeout for a connect to a non-fastcgi process
* (use state_timestamp + state)
*
*/
typedef struct fcgi_proc {
size_t id; /* id will be between 1 and max_procs */
buffer *unixsocket; /* config.socket + "-" + id */
unsigned port; /* config.port + pno */
buffer *connection_name; /* either tcp:<host>:<port> or unix:<socket> for debugging purposes */
pid_t pid; /* PID of the spawned process (0 if not spawned locally) */
size_t load; /* number of requests waiting on this process */
size_t requests; /* see max_requests */
struct fcgi_proc *prev, *next; /* see first */
time_t disabled_until; /* this proc is disabled until, use something else until then */
int is_local;
enum {
PROC_STATE_UNSET, /* init-phase */
PROC_STATE_RUNNING, /* alive */
PROC_STATE_OVERLOADED, /* listen-queue is full,
don't send anything to this proc for the next 2 seconds */
PROC_STATE_DIED_WAIT_FOR_PID, /* */
PROC_STATE_DIED, /* marked as dead, should be restarted */
PROC_STATE_KILLED /* was killed as we don't have the load anymore */
} state;
} fcgi_proc;
typedef struct {
/* the key that is used to reference this value */
buffer *id;
/* list of processes handling this extension
* sorted by lowest load
*
* whenever a job is done move it up in the list
* until it is sorted, move it down as soon as the
* job is started
*/
fcgi_proc *first;
fcgi_proc *unused_procs;
/*
* spawn at least min_procs, at max_procs.
*
* as soon as the load of the first entry
* is max_load_per_proc we spawn a new one
* and add it to the first entry and give it
* the load
*
*/
unsigned short max_procs;
size_t num_procs; /* how many procs are started */
size_t active_procs; /* how many of them are really running, i.e. state = PROC_STATE_RUNNING */
/*
* time after a disabled remote connection is tried to be re-enabled
*
*
*/
unsigned short disable_time;
/*
* some fastcgi processes get a little bit larger
* than wanted. max_requests_per_proc kills a
* process after a number of handled requests.
*
*/
size_t max_requests_per_proc;
/* config */
/*
* host:port
*
* if host is one of the local IP adresses the
* whole connection is local
*
* if port is not 0, and host is not specified,
* "localhost" (INADDR_LOOPBACK) is assumed.
*
*/
buffer *host;
unsigned short port;
/*
* Unix Domain Socket
*
* instead of TCP/IP we can use Unix Domain Sockets
* - more secure (you have fileperms to play with)
* - more control (on locally)
* - more speed (no extra overhead)
*/
buffer *unixsocket;
/* if socket is local we can start the fastcgi
* process ourself
*
* bin-path is the path to the binary
*
* check min_procs and max_procs for the number
* of process to start up
*/
buffer *bin_path;
/* bin-path is set bin-environment is taken to
* create the environement before starting the
* FastCGI process
*
*/
array *bin_env;
array *bin_env_copy;
/*
* docroot-translation between URL->phys and the
* remote host
*
* reasons:
* - different dir-layout if remote
* - chroot if local
*
*/
buffer *docroot;
/*
* fastcgi-mode:
* - responser
* - authorizer
*
*/
unsigned short mode;
/*
* check_local tells you if the phys file is stat()ed
* or not. FastCGI doesn't care if the service is
* remote. If the web-server side doesn't contain
* the fastcgi-files we should not stat() for them
* and say '404 not found'.
*/
unsigned short check_local;
/*
* append PATH_INFO to SCRIPT_FILENAME
*
* php needs this if cgi.fix_pathinfo is provided
*
*/
unsigned short break_scriptfilename_for_php;
/*
* workaround for program when prefix="/"
*
* rule to build PATH_INFO is hardcoded for when check_local is disabled
* enable this option to use the workaround
*
*/
unsigned short fix_root_path_name;
/*
* If the backend includes X-LIGHTTPD-send-file in the response
* we use the value as filename and ignore the content.
*
*/
unsigned short allow_xsendfile;
ssize_t load; /* replace by host->load */
size_t max_id; /* corresponds most of the time to
num_procs.
only if a process is killed max_id waits for the process itself
to die and decrements it afterwards */
buffer *strip_request_uri;
unsigned short kill_signal; /* we need a setting for this as libfcgi
applications prefer SIGUSR1 while the
rest of the world would use SIGTERM
*sigh* */
} fcgi_extension_host;
/*
* one extension can have multiple hosts assigned
* one host can spawn additional processes on the same
* socket (if we control it)
*
* ext -> host -> procs
* 1:n 1:n
*
* if the fastcgi process is remote that whole goes down
* to
*
* ext -> host -> procs
* 1:n 1:1
*
* in case of PHP and FCGI_CHILDREN we have again a procs
* but we don't control it directly.
*
*/
typedef struct {
buffer *key; /* like .php */
int note_is_sent;
int last_used_ndx;
fcgi_extension_host **hosts;
size_t used;
size_t size;
} fcgi_extension;
typedef struct {
fcgi_extension **exts;
size_t used;
size_t size;
} fcgi_exts;
typedef struct {
fcgi_exts *exts;
array *ext_mapping;
unsigned int debug;
} plugin_config;
typedef struct {
char **ptr;
size_t size;
size_t used;
} char_array;
/* generic plugin data, shared between all connections */
typedef struct {
PLUGIN_DATA;
buffer *fcgi_env;
buffer *path;
buffer *parse_response;
buffer *statuskey;
plugin_config **config_storage;
plugin_config conf; /* this is only used as long as no handler_ctx is setup */
} plugin_data;
/* connection specific data */
typedef enum {
FCGI_STATE_UNSET,
FCGI_STATE_INIT,
FCGI_STATE_CONNECT_DELAYED,
FCGI_STATE_PREPARE_WRITE,
FCGI_STATE_WRITE,
FCGI_STATE_READ
} fcgi_connection_state_t;
typedef struct {
fcgi_proc *proc;
fcgi_extension_host *host;
fcgi_extension *ext;
fcgi_connection_state_t state;
time_t state_timestamp;
int reconnects; /* number of reconnect attempts */
chunkqueue *rb; /* read queue */
chunkqueue *wb; /* write queue */
buffer *response_header;
size_t request_id;
int fd; /* fd to the fastcgi process */
int fde_ndx; /* index into the fd-event buffer */
pid_t pid;
int got_proc;
int send_content_body;
plugin_config conf;
connection *remote_conn; /* dumb pointer */
plugin_data *plugin_data; /* dumb pointer */
} handler_ctx;
/* ok, we need a prototype */
static handler_t fcgi_handle_fdevent(server *srv, void *ctx, int revents);
static void reset_signals(void) {
#ifdef SIGTTOU
signal(SIGTTOU, SIG_DFL);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_DFL);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_DFL);
#endif
signal(SIGHUP, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
signal(SIGUSR1, SIG_DFL);
}
static void fastcgi_status_copy_procname(buffer *b, fcgi_extension_host *host, fcgi_proc *proc) {
buffer_copy_string_len(b, CONST_STR_LEN("fastcgi.backend."));
buffer_append_string_buffer(b, host->id);
if (proc) {
buffer_append_string_len(b, CONST_STR_LEN("."));
buffer_append_long(b, proc->id);
}
}
static void fcgi_proc_load_inc(server *srv, handler_ctx *hctx) {
plugin_data *p = hctx->plugin_data;
hctx->proc->load++;
status_counter_inc(srv, CONST_STR_LEN("fastcgi.active-requests"));
fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));
status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->proc->load);
}
static void fcgi_proc_load_dec(server *srv, handler_ctx *hctx) {
plugin_data *p = hctx->plugin_data;
hctx->proc->load--;
status_counter_dec(srv, CONST_STR_LEN("fastcgi.active-requests"));
fastcgi_status_copy_procname(p->statuskey, hctx->host, hctx->proc);
buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));
status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->proc->load);
}
static void fcgi_host_assign(server *srv, handler_ctx *hctx, fcgi_extension_host *host) {
plugin_data *p = hctx->plugin_data;
hctx->host = host;
hctx->host->load++;
fastcgi_status_copy_procname(p->statuskey, hctx->host, NULL);
buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));
status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->host->load);
}
static void fcgi_host_reset(server *srv, handler_ctx *hctx) {
plugin_data *p = hctx->plugin_data;
hctx->host->load--;
fastcgi_status_copy_procname(p->statuskey, hctx->host, NULL);
buffer_append_string_len(p->statuskey, CONST_STR_LEN(".load"));
status_counter_set(srv, CONST_BUF_LEN(p->statuskey), hctx->host->load);
hctx->host = NULL;
}
static void fcgi_host_disable(server *srv, handler_ctx *hctx) {
plugin_data *p = hctx->plugin_data;
if (hctx->host->disable_time || hctx->proc->is_local) {
if (hctx->proc->state == PROC_STATE_RUNNING) hctx->host->active_procs--;
hctx->proc->disabled_until = srv->cur_ts + hctx->host->disable_time;
hctx->proc->state = hctx->proc->is_local ? PROC_STATE_DIED_WAIT_FOR_PID : PROC_STATE_DIED;
if (p->conf.debug) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"backend disabled for", hctx->host->disable_time, "seconds");
}
}
}
static int fastcgi_status_init(server *srv, buffer *b, fcgi_extension_host *host, fcgi_proc *proc) {
#define CLEAN(x) \
fastcgi_status_copy_procname(b, host, proc); \
buffer_append_string_len(b, CONST_STR_LEN(x)); \
status_counter_set(srv, CONST_BUF_LEN(b), 0);
CLEAN(".disabled");
CLEAN(".died");
CLEAN(".overloaded");
CLEAN(".connected");
CLEAN(".load");
#undef CLEAN
#define CLEAN(x) \
fastcgi_status_copy_procname(b, host, NULL); \
buffer_append_string_len(b, CONST_STR_LEN(x)); \
status_counter_set(srv, CONST_BUF_LEN(b), 0);
CLEAN(".load");
#undef CLEAN
return 0;
}
static handler_ctx * handler_ctx_init(void) {
handler_ctx * hctx;
hctx = calloc(1, sizeof(*hctx));
force_assert(hctx);
hctx->fde_ndx = -1;
hctx->response_header = buffer_init();
hctx->request_id = 0;
hctx->state = FCGI_STATE_INIT;
hctx->proc = NULL;
hctx->fd = -1;
hctx->reconnects = 0;
hctx->send_content_body = 1;
hctx->rb = chunkqueue_init();
hctx->wb = chunkqueue_init();
return hctx;
}
static void handler_ctx_free(server *srv, handler_ctx *hctx) {
if (hctx->host) {
fcgi_host_reset(srv, hctx);
}
buffer_free(hctx->response_header);
chunkqueue_free(hctx->rb);
chunkqueue_free(hctx->wb);
free(hctx);
}
static fcgi_proc *fastcgi_process_init(void) {
fcgi_proc *f;
f = calloc(1, sizeof(*f));
f->unixsocket = buffer_init();
f->connection_name = buffer_init();
f->prev = NULL;
f->next = NULL;
return f;
}
static void fastcgi_process_free(fcgi_proc *f) {
if (!f) return;
fastcgi_process_free(f->next);
buffer_free(f->unixsocket);
buffer_free(f->connection_name);
free(f);
}
static fcgi_extension_host *fastcgi_host_init(void) {
fcgi_extension_host *f;
f = calloc(1, sizeof(*f));
f->id = buffer_init();
f->host = buffer_init();
f->unixsocket = buffer_init();
f->docroot = buffer_init();
f->bin_path = buffer_init();
f->bin_env = array_init();
f->bin_env_copy = array_init();
f->strip_request_uri = buffer_init();
return f;
}
static void fastcgi_host_free(fcgi_extension_host *h) {
if (!h) return;
buffer_free(h->id);
buffer_free(h->host);
buffer_free(h->unixsocket);
buffer_free(h->docroot);
buffer_free(h->bin_path);
buffer_free(h->strip_request_uri);
array_free(h->bin_env);
array_free(h->bin_env_copy);
fastcgi_process_free(h->first);
fastcgi_process_free(h->unused_procs);
free(h);
}
static fcgi_exts *fastcgi_extensions_init(void) {
fcgi_exts *f;
f = calloc(1, sizeof(*f));
return f;
}
static void fastcgi_extensions_free(fcgi_exts *f) {
size_t i;
if (!f) return;
for (i = 0; i < f->used; i++) {
fcgi_extension *fe;
size_t j;
fe = f->exts[i];
for (j = 0; j < fe->used; j++) {
fcgi_extension_host *h;
h = fe->hosts[j];
fastcgi_host_free(h);
}
buffer_free(fe->key);
free(fe->hosts);
free(fe);
}
free(f->exts);
free(f);
}
static int fastcgi_extension_insert(fcgi_exts *ext, buffer *key, fcgi_extension_host *fh) {
fcgi_extension *fe;
size_t i;
/* there is something */
for (i = 0; i < ext->used; i++) {
if (buffer_is_equal(key, ext->exts[i]->key)) {
break;
}
}
if (i == ext->used) {
/* filextension is new */
fe = calloc(1, sizeof(*fe));
force_assert(fe);
fe->key = buffer_init();
fe->last_used_ndx = -1;
buffer_copy_string_buffer(fe->key, key);
/* */
if (ext->size == 0) {
ext->size = 8;
ext->exts = malloc(ext->size * sizeof(*(ext->exts)));
force_assert(ext->exts);
} else if (ext->used == ext->size) {
ext->size += 8;
ext->exts = realloc(ext->exts, ext->size * sizeof(*(ext->exts)));
force_assert(ext->exts);
}
ext->exts[ext->used++] = fe;
} else {
fe = ext->exts[i];
}
if (fe->size == 0) {
fe->size = 4;
fe->hosts = malloc(fe->size * sizeof(*(fe->hosts)));
force_assert(fe->hosts);
} else if (fe->size == fe->used) {
fe->size += 4;
fe->hosts = realloc(fe->hosts, fe->size * sizeof(*(fe->hosts)));
force_assert(fe->hosts);
}
fe->hosts[fe->used++] = fh;
return 0;
}
INIT_FUNC(mod_fastcgi_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->fcgi_env = buffer_init();
p->path = buffer_init();
p->parse_response = buffer_init();
p->statuskey = buffer_init();
return p;
}
FREE_FUNC(mod_fastcgi_free) {
plugin_data *p = p_d;
UNUSED(srv);
buffer_free(p->fcgi_env);
buffer_free(p->path);