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lighttpd1.4/src/mod_cgi.c

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#include "server.h"
#include "stat_cache.h"
#include "keyvalue.h"
#include "log.h"
#include "connections.h"
#include "joblist.h"
#include "http_chunk.h"
#include "plugin.h"
#include <sys/types.h>
#ifdef __WIN32
# include <winsock2.h>
#else
# include <sys/socket.h>
# include <sys/wait.h>
# include <sys/mman.h>
# include <netinet/in.h>
# include <arpa/inet.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <fdevent.h>
#include <signal.h>
#include <ctype.h>
#include <assert.h>
#include <stdio.h>
#include <fcntl.h>
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#include "version.h"
enum {EOL_UNSET, EOL_N, EOL_RN};
typedef struct {
char **ptr;
size_t size;
size_t used;
} char_array;
typedef struct {
pid_t *ptr;
size_t used;
size_t size;
} buffer_pid_t;
typedef struct {
array *cgi;
unsigned short execute_x_only;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer_pid_t cgi_pid;
buffer *tmp_buf;
buffer *parse_response;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
typedef struct {
pid_t pid;
int fd;
int fde_ndx; /* index into the fd-event buffer */
connection *remote_conn; /* dumb pointer */
plugin_data *plugin_data; /* dumb pointer */
buffer *response;
buffer *response_header;
} handler_ctx;
static handler_ctx * cgi_handler_ctx_init(void) {
handler_ctx *hctx = calloc(1, sizeof(*hctx));
force_assert(hctx);
hctx->response = buffer_init();
hctx->response_header = buffer_init();
return hctx;
}
static void cgi_handler_ctx_free(handler_ctx *hctx) {
buffer_free(hctx->response);
buffer_free(hctx->response_header);
free(hctx);
}
enum {FDEVENT_HANDLED_UNSET, FDEVENT_HANDLED_FINISHED, FDEVENT_HANDLED_NOT_FINISHED, FDEVENT_HANDLED_ERROR};
INIT_FUNC(mod_cgi_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
force_assert(p);
p->tmp_buf = buffer_init();
p->parse_response = buffer_init();
return p;
}
FREE_FUNC(mod_cgi_free) {
plugin_data *p = p_d;
buffer_pid_t *r = &(p->cgi_pid);
UNUSED(srv);
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
array_free(s->cgi);
free(s);
}
free(p->config_storage);
}
if (r->ptr) free(r->ptr);
buffer_free(p->tmp_buf);
buffer_free(p->parse_response);
free(p);
return HANDLER_GO_ON;
}
SETDEFAULTS_FUNC(mod_fastcgi_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "cgi.assign", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "cgi.execute-x-only", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET}
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
force_assert(s);
s->cgi = array_init();
s->execute_x_only = 0;
cv[0].destination = s->cgi;
cv[1].destination = &(s->execute_x_only);
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
static int cgi_pid_add(server *srv, plugin_data *p, pid_t pid) {
int m = -1;
size_t i;
buffer_pid_t *r = &(p->cgi_pid);
UNUSED(srv);
for (i = 0; i < r->used; i++) {
if (r->ptr[i] > m) m = r->ptr[i];
}
if (r->size == 0) {
r->size = 16;
r->ptr = malloc(sizeof(*r->ptr) * r->size);
} else if (r->used == r->size) {
r->size += 16;
r->ptr = realloc(r->ptr, sizeof(*r->ptr) * r->size);
}
r->ptr[r->used++] = pid;
return m;
}
static int cgi_pid_del(server *srv, plugin_data *p, pid_t pid) {
size_t i;
buffer_pid_t *r = &(p->cgi_pid);
UNUSED(srv);
for (i = 0; i < r->used; i++) {
if (r->ptr[i] == pid) break;
}
if (i != r->used) {
/* found */
if (i != r->used - 1) {
r->ptr[i] = r->ptr[r->used - 1];
}
r->used--;
}
return 0;
}
static int cgi_response_parse(server *srv, connection *con, plugin_data *p, buffer *in) {
char *ns;
const char *s;
int line = 0;
UNUSED(srv);
buffer_copy_string_buffer(p->parse_response, in);
for (s = p->parse_response->ptr;
NULL != (ns = strchr(s, '\n'));
s = ns + 1, line++) {
const char *key, *value;
int key_len;
data_string *ds;
/* strip the \n */
ns[0] = '\0';
if (ns > s && ns[-1] == '\r') ns[-1] = '\0';
if (line == 0 &&
0 == strncmp(s, "HTTP/1.", 7)) {
/* non-parsed header ... we parse them anyway */
if ((s[7] == '1' ||
s[7] == '0') &&
s[8] == ' ') {
int status;
/* after the space should be a status code for us */
status = strtol(s+9, NULL, 10);
if (status >= 100 &&
status < 1000) {
/* we expected 3 digits and didn't got them */
con->parsed_response |= HTTP_STATUS;
con->http_status = status;
}
}
} else {
/* parse the headers */
key = s;
if (NULL == (value = strchr(s, ':'))) {
/* we expect: "<key>: <value>\r\n" */
continue;
}
key_len = value - key;
value += 1;
/* skip LWS */
while (*value == ' ' || *value == '\t') value++;
if (NULL == (ds = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) {
ds = data_response_init();
}
buffer_copy_string_len(ds->key, key, key_len);
buffer_copy_string(ds->value, value);
array_insert_unique(con->response.headers, (data_unset *)ds);
switch(key_len) {
case 4:
if (0 == strncasecmp(key, "Date", key_len)) {
con->parsed_response |= HTTP_DATE;
}
break;
case 6:
if (0 == strncasecmp(key, "Status", key_len)) {
con->http_status = strtol(value, NULL, 10);
con->parsed_response |= HTTP_STATUS;
}
break;
case 8:
if (0 == strncasecmp(key, "Location", key_len)) {
con->parsed_response |= HTTP_LOCATION;
}
break;
case 10:
if (0 == strncasecmp(key, "Connection", key_len)) {
con->response.keep_alive = (0 == strcasecmp(value, "Keep-Alive")) ? 1 : 0;
con->parsed_response |= HTTP_CONNECTION;
}
break;
case 14:
if (0 == strncasecmp(key, "Content-Length", key_len)) {
con->response.content_length = strtol(value, NULL, 10);
con->parsed_response |= HTTP_CONTENT_LENGTH;
}
break;
default:
break;
}
}
}
/* CGI/1.1 rev 03 - 7.2.1.2 */
if ((con->parsed_response & HTTP_LOCATION) &&
!(con->parsed_response & HTTP_STATUS)) {
con->http_status = 302;
}
return 0;
}
static int cgi_demux_response(server *srv, handler_ctx *hctx) {
plugin_data *p = hctx->plugin_data;
connection *con = hctx->remote_conn;
while(1) {
int n;
int toread;
#if defined(__WIN32)
buffer_prepare_copy(hctx->response, 4 * 1024);
#else
if (ioctl(con->fd, FIONREAD, &toread) || toread == 0 || toread <= 4*1024) {
buffer_prepare_copy(hctx->response, 4 * 1024);
} else {
if (toread > MAX_READ_LIMIT) toread = MAX_READ_LIMIT;
buffer_prepare_copy(hctx->response, toread + 1);
}
#endif
if (-1 == (n = read(hctx->fd, hctx->response->ptr, hctx->response->size - 1))) {
if (errno == EAGAIN || errno == EINTR) {
/* would block, wait for signal */
return FDEVENT_HANDLED_NOT_FINISHED;
}
/* error */
log_error_write(srv, __FILE__, __LINE__, "sdd", strerror(errno), con->fd, hctx->fd);
return FDEVENT_HANDLED_ERROR;
}
if (n == 0) {
/* read finished */
con->file_finished = 1;
/* send final chunk */
http_chunk_append_mem(srv, con, NULL, 0);
joblist_append(srv, con);
return FDEVENT_HANDLED_FINISHED;
}
hctx->response->ptr[n] = '\0';
hctx->response->used = n+1;
/* split header from body */
if (con->file_started == 0) {
int is_header = 0;
int is_header_end = 0;
size_t last_eol = 0;
size_t i;
buffer_append_string_buffer(hctx->response_header, hctx->response);
/**
* we have to handle a few cases:
*
* nph:
*
* HTTP/1.0 200 Ok\n
* Header: Value\n
* \n
*
* CGI:
* Header: Value\n
* Status: 200\n
* \n
*
* and different mixes of \n and \r\n combinations
*
* Some users also forget about CGI and just send a response and hope
* we handle it. No headers, no header-content seperator
*
*/
/* nph (non-parsed headers) */
if (0 == strncmp(hctx->response_header->ptr, "HTTP/1.", 7)) is_header = 1;
for (i = 0; !is_header_end && i < hctx->response_header->used - 1; i++) {
char c = hctx->response_header->ptr[i];
switch (c) {
case ':':
/* we found a colon
*
* looks like we have a normal header
*/
is_header = 1;
break;
case '\n':
/* EOL */
if (is_header == 0) {
/* we got a EOL but we don't seem to got a HTTP header */
is_header_end = 1;
break;
}
/**
* check if we saw a \n(\r)?\n sequence
*/
if (last_eol > 0 &&
((i - last_eol == 1) ||
(i - last_eol == 2 && hctx->response_header->ptr[i - 1] == '\r'))) {
is_header_end = 1;
break;
}
last_eol = i;
break;
}
}
if (is_header_end) {
if (!is_header) {
/* no header, but a body */
if (con->request.http_version == HTTP_VERSION_1_1) {
con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED;
}
http_chunk_append_mem(srv, con, hctx->response_header->ptr, hctx->response_header->used);
joblist_append(srv, con);
} else {
const char *bstart;
size_t blen;
/**
* i still points to the char after the terminating EOL EOL
*
* put it on the last \n again
*/
i--;
/* the body starts after the EOL */
bstart = hctx->response_header->ptr + (i + 1);
blen = (hctx->response_header->used - 1) - (i + 1);
/* string the last \r?\n */
if (i > 0 && (hctx->response_header->ptr[i - 1] == '\r')) {
i--;
}
hctx->response_header->ptr[i] = '\0';
hctx->response_header->used = i + 1; /* the string + \0 */
/* parse the response header */
cgi_response_parse(srv, con, p, hctx->response_header);
/* enable chunked-transfer-encoding */
if (con->request.http_version == HTTP_VERSION_1_1 &&
!(con->parsed_response & HTTP_CONTENT_LENGTH)) {
con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED;
}
if (blen > 0) {
http_chunk_append_mem(srv, con, bstart, blen + 1);
joblist_append(srv, con);
}
}
con->file_started = 1;
}
} else {
http_chunk_append_mem(srv, con, hctx->response->ptr, hctx->response->used);
joblist_append(srv, con);
}
#if 0
log_error_write(srv, __FILE__, __LINE__, "ddss", con->fd, hctx->fd, connection_get_state(con->state), b->ptr);
#endif
}
return FDEVENT_HANDLED_NOT_FINISHED;
}
static handler_t cgi_connection_close(server *srv, handler_ctx *hctx) {
int status;
pid_t pid;
plugin_data *p;
connection *con;
if (NULL == hctx) return HANDLER_GO_ON;
p = hctx->plugin_data;
con = hctx->remote_conn;
if (con->mode != p->id) return HANDLER_GO_ON;
#ifndef __WIN32
/* the connection to the browser went away, but we still have a connection
* to the CGI script
*
* close cgi-connection
*/
if (hctx->fd != -1) {
/* close connection to the cgi-script */
fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
fdevent_unregister(srv->ev, hctx->fd);
if (close(hctx->fd)) {
log_error_write(srv, __FILE__, __LINE__, "sds", "cgi close failed ", hctx->fd, strerror(errno));
}
hctx->fd = -1;
hctx->fde_ndx = -1;
}
pid = hctx->pid;
con->plugin_ctx[p->id] = NULL;
/* is this a good idea ? */
cgi_handler_ctx_free(hctx);
/* if waitpid hasn't been called by response.c yet, do it here */
if (pid) {
/* check if the CGI-script is already gone */
switch(waitpid(pid, &status, WNOHANG)) {
case 0:
/* not finished yet */
#if 0
log_error_write(srv, __FILE__, __LINE__, "sd", "(debug) child isn't done yet, pid:", pid);
#endif
break;
case -1:
/* */
if (errno == EINTR) break;
/*
* errno == ECHILD happens if _subrequest catches the process-status before
* we have read the response of the cgi process
*
* -> catch status
* -> WAIT_FOR_EVENT
* -> read response
* -> we get here with waitpid == ECHILD
*
*/
if (errno == ECHILD) return HANDLER_GO_ON;
log_error_write(srv, __FILE__, __LINE__, "ss", "waitpid failed: ", strerror(errno));
return HANDLER_ERROR;
default:
/* Send an error if we haven't sent any data yet */
if (0 == con->file_started) {
connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
con->http_status = 500;
con->mode = DIRECT;
} else {
con->file_finished = 1;
}
if (WIFEXITED(status)) {
#if 0
log_error_write(srv, __FILE__, __LINE__, "sd", "(debug) cgi exited fine, pid:", pid);
#endif
return HANDLER_GO_ON;
} else {
log_error_write(srv, __FILE__, __LINE__, "sd", "cgi died, pid:", pid);
return HANDLER_GO_ON;
}
}
kill(pid, SIGTERM);
/* cgi-script is still alive, queue the PID for removal */
cgi_pid_add(srv, p, pid);
}
#endif
return HANDLER_GO_ON;
}
static handler_t cgi_connection_close_callback(server *srv, connection *con, void *p_d) {
plugin_data *p = p_d;
return cgi_connection_close(srv, con->plugin_ctx[p->id]);
}
static handler_t cgi_handle_fdevent(server *srv, void *ctx, int revents) {
handler_ctx *hctx = ctx;
connection *con = hctx->remote_conn;
joblist_append(srv, con);
if (hctx->fd == -1) {
log_error_write(srv, __FILE__, __LINE__, "ddss", con->fd, hctx->fd, connection_get_state(con->state), "invalid cgi-fd");
return HANDLER_ERROR;
}
if (revents & FDEVENT_IN) {
switch (cgi_demux_response(srv, hctx)) {
case FDEVENT_HANDLED_NOT_FINISHED:
break;
case FDEVENT_HANDLED_FINISHED:
/* we are done */
#if 0
log_error_write(srv, __FILE__, __LINE__, "ddss", con->fd, hctx->fd, connection_get_state(con->state), "finished");
#endif
cgi_connection_close(srv, hctx);
/* if we get a IN|HUP and have read everything don't exec the close twice */
return HANDLER_FINISHED;
case FDEVENT_HANDLED_ERROR:
/* Send an error if we haven't sent any data yet */
if (0 == con->file_started) {
connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
con->http_status = 500;
con->mode = DIRECT;
} else {
con->file_finished = 1;
}
log_error_write(srv, __FILE__, __LINE__, "s", "demuxer failed: ");
break;
}
}
if (revents & FDEVENT_OUT) {
/* nothing to do */
}
/* perhaps this issue is already handled */
if (revents & FDEVENT_HUP) {
/* check if we still have a unfinished header package which is a body in reality */
if (con->file_started == 0 &&
hctx->response_header->used) {
con->file_started = 1;
http_chunk_append_mem(srv, con, hctx->response_header->ptr, hctx->response_header->used);
joblist_append(srv, con);
}
if (con->file_finished == 0) {
http_chunk_append_mem(srv, con, NULL, 0);
joblist_append(srv, con);
}
con->file_finished = 1;
if (chunkqueue_is_empty(con->write_queue)) {
/* there is nothing left to write */
connection_set_state(srv, con, CON_STATE_RESPONSE_END);
} else {
/* used the write-handler to finish the request on demand */
}
# if 0
log_error_write(srv, __FILE__, __LINE__, "sddd", "got HUP from cgi", con->fd, hctx->fd, revents);
# endif
/* rtsigs didn't liked the close */
cgi_connection_close(srv, hctx);
} else if (revents & FDEVENT_ERR) {
con->file_finished = 1;
/* kill all connections to the cgi process */
cgi_connection_close(srv, hctx);
#if 1
log_error_write(srv, __FILE__, __LINE__, "s", "cgi-FDEVENT_ERR");
#endif
return HANDLER_ERROR;
}
return HANDLER_FINISHED;
}
static int cgi_env_add(char_array *env, const char *key, size_t key_len, const char *val, size_t val_len) {
char *dst;
if (!key || !val) return -1;
dst = malloc(key_len + val_len + 2);
memcpy(dst, key, key_len);
dst[key_len] = '=';
memcpy(dst + key_len + 1, val, val_len);
dst[key_len + 1 + val_len] = '\0';
if (env->size == 0) {
env->size = 16;
env->ptr = malloc(env->size * sizeof(*env->ptr));
} else if (env->size == env->used) {
env->size += 16;
env->ptr = realloc(env->ptr, env->size * sizeof(*env->ptr));
}
env->ptr[env->used++] = dst;
return 0;
}
static int cgi_create_env(server *srv, connection *con, plugin_data *p, buffer *cgi_handler) {
pid_t pid;
#ifdef HAVE_IPV6
char b2[INET6_ADDRSTRLEN + 1];
#endif
int to_cgi_fds[2];
int from_cgi_fds[2];
struct stat st;
#ifndef __WIN32
if (cgi_handler->used > 1) {
/* stat the exec file */
if (-1 == (stat(cgi_handler->ptr, &st))) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"stat for cgi-handler", cgi_handler,
"failed:", strerror(errno));
return -1;
}
}
if (pipe(to_cgi_fds)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "pipe failed:", strerror(errno));
return -1;
}
if (pipe(from_cgi_fds)) {
close(to_cgi_fds[0]);
close(to_cgi_fds[1]);
log_error_write(srv, __FILE__, __LINE__, "ss", "pipe failed:", strerror(errno));
return -1;
}
/* fork, execve */
switch (pid = fork()) {
case 0: {
/* child */
char **args;
int argc;
int i = 0;
char buf[32];
size_t n;
char_array env;
char *c;
const char *s;
server_socket *srv_sock = con->srv_socket;
/* move stdout to from_cgi_fd[1] */
close(STDOUT_FILENO);
dup2(from_cgi_fds[1], STDOUT_FILENO);
close(from_cgi_fds[1]);
/* not needed */
close(from_cgi_fds[0]);
/* move the stdin to to_cgi_fd[0] */
close(STDIN_FILENO);
dup2(to_cgi_fds[0], STDIN_FILENO);
close(to_cgi_fds[0]);
/* not needed */
close(to_cgi_fds[1]);
/* create environment */
env.ptr = NULL;
env.size = 0;
env.used = 0;
if (buffer_is_empty(con->conf.server_tag)) {
cgi_env_add(&env, CONST_STR_LEN("SERVER_SOFTWARE"), CONST_STR_LEN(PACKAGE_DESC));
} else {
cgi_env_add(&env, CONST_STR_LEN("SERVER_SOFTWARE"), CONST_BUF_LEN(con->conf.server_tag));
}
if (!buffer_is_empty(con->server_name)) {
size_t len = con->server_name->used - 1;
if (con->server_name->ptr[0] == '[') {
const char *colon = strstr(con->server_name->ptr, "]:");
if (colon) len = (colon + 1) - con->server_name->ptr;
} else {
const char *colon = strchr(con->server_name->ptr, ':');
if (colon) len = colon - con->server_name->ptr;
}
cgi_env_add(&env, CONST_STR_LEN("SERVER_NAME"), con->server_name->ptr, len);
} else {
#ifdef HAVE_IPV6
s = inet_ntop(srv_sock->addr.plain.sa_family,
srv_sock->addr.plain.sa_family == AF_INET6 ?
(const void *) &(srv_sock->addr.ipv6.sin6_addr) :
(const void *) &(srv_sock->addr.ipv4.sin_addr),
b2, sizeof(b2)-1);
#else
s = inet_ntoa(srv_sock->addr.ipv4.sin_addr);
#endif
cgi_env_add(&env, CONST_STR_LEN("SERVER_NAME"), s, strlen(s));
}
cgi_env_add(&env, CONST_STR_LEN("GATEWAY_INTERFACE"), CONST_STR_LEN("CGI/1.1"));
s = get_http_version_name(con->request.http_version);
cgi_env_add(&env, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s));
LI_ltostr(buf,
#ifdef HAVE_IPV6
ntohs(srv_sock->addr.plain.sa_family == AF_INET6 ? srv_sock->addr.ipv6.sin6_port : srv_sock->addr.ipv4.sin_port)
#else
ntohs(srv_sock->addr.ipv4.sin_port)
#endif
);
cgi_env_add(&env, CONST_STR_LEN("SERVER_PORT"), buf, strlen(buf));
switch (srv_sock->addr.plain.sa_family) {
#ifdef HAVE_IPV6
case AF_INET6:
s = inet_ntop(srv_sock->addr.plain.sa_family,
(const void *) &(srv_sock->addr.ipv6.sin6_addr),
b2, sizeof(b2)-1);
break;
case AF_INET:
s = inet_ntop(srv_sock->addr.plain.sa_family,
(const void *) &(srv_sock->addr.ipv4.sin_addr),
b2, sizeof(b2)-1);
break;
#else
case AF_INET:
s = inet_ntoa(srv_sock->addr.ipv4.sin_addr);
break;
#endif
default:
s = "";
break;
}
cgi_env_add(&env, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s));
s = get_http_method_name(con->request.http_method);
cgi_env_add(&env, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s));
if (!buffer_is_empty(con->request.pathinfo)) {
cgi_env_add(&env, CONST_STR_LEN("PATH_INFO"), CONST_BUF_LEN(con->request.pathinfo));
}
cgi_env_add(&env, CONST_STR_LEN("REDIRECT_STATUS"), CONST_STR_LEN("200"));
if (!buffer_is_empty(con->uri.query)) {
cgi_env_add(&env, CONST_STR_LEN("QUERY_STRING"), CONST_BUF_LEN(con->uri.query));
}
if (!buffer_is_empty(con->request.orig_uri)) {
cgi_env_add(&env, CONST_STR_LEN("REQUEST_URI"), CONST_BUF_LEN(con->request.orig_uri));
}
switch (con->dst_addr.plain.sa_family) {
#ifdef HAVE_IPV6
case AF_INET6:
s = inet_ntop(con->dst_addr.plain.sa_family,
(const void *) &(con->dst_addr.ipv6.sin6_addr),
b2, sizeof(b2)-1);
break;
case AF_INET:
s = inet_ntop(con->dst_addr.plain.sa_family,
(const void *) &(con->dst_addr.ipv4.sin_addr),
b2, sizeof(b2)-1);
break;
#else
case AF_INET:
s = inet_ntoa(con->dst_addr.ipv4.sin_addr);
break;
#endif
default:
s = "";
break;
}
cgi_env_add(&env, CONST_STR_LEN("REMOTE_ADDR"), s, strlen(s));
LI_ltostr(buf,
#ifdef HAVE_IPV6
ntohs(con->dst_addr.plain.sa_family == AF_INET6 ? con->dst_addr.ipv6.sin6_port : con->dst_addr.ipv4.sin_port)
#else
ntohs(con->dst_addr.ipv4.sin_port)
#endif
);
cgi_env_add(&env, CONST_STR_LEN("REMOTE_PORT"), buf, strlen(buf));
if (buffer_is_equal_caseless_string(con->uri.scheme, CONST_STR_LEN("https"))) {
cgi_env_add(&env, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on"));
}
/* request.content_length < SSIZE_MAX, see request.c */
LI_ltostr(buf, con->request.content_length);
cgi_env_add(&env, CONST_STR_LEN("CONTENT_LENGTH"), buf, strlen(buf));
cgi_env_add(&env, CONST_STR_LEN("SCRIPT_FILENAME"), CONST_BUF_LEN(con->physical.path));
cgi_env_add(&env, CONST_STR_LEN("SCRIPT_NAME"), CONST_BUF_LEN(con->uri.path));
cgi_env_add(&env, CONST_STR_LEN("DOCUMENT_ROOT"), CONST_BUF_LEN(con->physical.basedir));
/* for valgrind */
if (NULL != (s = getenv("LD_PRELOAD"))) {
cgi_env_add(&env, CONST_STR_LEN("LD_PRELOAD"), s, strlen(s));
}
if (NULL != (s = getenv("LD_LIBRARY_PATH"))) {
cgi_env_add(&env, CONST_STR_LEN("LD_LIBRARY_PATH"), s, strlen(s));
}
#ifdef __CYGWIN__
/* CYGWIN needs SYSTEMROOT */
if (NULL != (s = getenv("SYSTEMROOT"))) {
cgi_env_add(&env, CONST_STR_LEN("SYSTEMROOT"), s, strlen(s));
}
#endif
for (n = 0; n < con->request.headers->used; n++) {
data_string *ds;
ds = (data_string *)con->request.headers->data[n];
if (ds->value->used && ds->key->used) {
size_t j;
buffer_reset(p->tmp_buf);
if (0 != strcasecmp(ds->key->ptr, "CONTENT-TYPE")) {
buffer_copy_string_len(p->tmp_buf, CONST_STR_LEN("HTTP_"));
p->tmp_buf->used--; /* strip \0 after HTTP_ */
}
buffer_prepare_append(p->tmp_buf, ds->key->used + 2);
for (j = 0; j < ds->key->used - 1; j++) {
char cr = '_';
if (light_isalpha(ds->key->ptr[j])) {
/* upper-case */
cr = ds->key->ptr[j] & ~32;
} else if (light_isdigit(ds->key->ptr[j])) {
/* copy */
cr = ds->key->ptr[j];
}
p->tmp_buf->ptr[p->tmp_buf->used++] = cr;
}
p->tmp_buf->ptr[p->tmp_buf->used++] = '\0';
cgi_env_add(&env, CONST_BUF_LEN(p->tmp_buf), CONST_BUF_LEN(ds->value));
}
}
for (n = 0; n < con->environment->used; n++) {
data_string *ds;
ds = (data_string *)con->environment->data[n];
if (ds->value->used && ds->key->used) {
size_t j;
buffer_reset(p->tmp_buf);
buffer_prepare_append(p->tmp_buf, ds->key->used + 2);
for (j = 0; j < ds->key->used - 1; j++) {
char cr = '_';
if (light_isalpha(ds->key->ptr[j])) {
/* upper-case */
cr = ds->key->ptr[j] & ~32;
} else if (light_isdigit(ds->key->ptr[j])) {
/* copy */
cr = ds->key->ptr[j];
}
p->tmp_buf->ptr[p->tmp_buf->used++] = cr;
}
p->tmp_buf->ptr[p->tmp_buf->used++] = '\0';
cgi_env_add(&env, CONST_BUF_LEN(p->tmp_buf), CONST_BUF_LEN(ds->value));
}
}
if (env.size == env.used) {
env.size += 16;
env.ptr = realloc(env.ptr, env.size * sizeof(*env.ptr));
}
env.ptr[env.used] = NULL;
/* set up args */
argc = 3;
args = malloc(sizeof(*args) * argc);
i = 0;
if (cgi_handler->used > 1) {
args[i++] = cgi_handler->ptr;
}
args[i++] = con->physical.path->ptr;
args[i ] = NULL;
/* search for the last / */
if (NULL != (c = strrchr(con->physical.path->ptr, '/'))) {
*c = '\0';
/* change to the physical directory */
if (-1 == chdir(con->physical.path->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "ssb", "chdir failed:", strerror(errno), con->physical.path);
}
*c = '/';
}
/* we don't need the client socket */
for (i = 3; i < 256; i++) {
if (i != srv->errorlog_fd) close(i);
}
/* exec the cgi */
execve(args[0], args, env.ptr);
/* log_error_write(srv, __FILE__, __LINE__, "sss", "CGI failed:", strerror(errno), args[0]); */
/* */
SEGFAULT();
break;
}
case -1:
/* error */
log_error_write(srv, __FILE__, __LINE__, "ss", "fork failed:", strerror(errno));
close(from_cgi_fds[0]);
close(from_cgi_fds[1]);
close(to_cgi_fds[0]);
close(to_cgi_fds[1]);
return -1;
break;
default: {
handler_ctx *hctx;
/* father */
close(from_cgi_fds[1]);
close(to_cgi_fds[0]);
if (con->request.content_length) {
chunkqueue *cq = con->request_content_queue;
chunk *c;
assert(chunkqueue_length(cq) == (off_t)con->request.content_length);
/* there is content to send */
for (c = cq->first; c; c = cq->first) {
int r = 0;
/* copy all chunks */
switch(c->type) {
case FILE_CHUNK:
if (c->file.mmap.start == MAP_FAILED) {
if (-1 == c->file.fd && /* open the file if not already open */
-1 == (c->file.fd = open(c->file.name->ptr, O_RDONLY))) {
log_error_write(srv, __FILE__, __LINE__, "ss", "open failed: ", strerror(errno));
close(from_cgi_fds[0]);
close(to_cgi_fds[1]);
return -1;
}
c->file.mmap.length = c->file.length;
if (MAP_FAILED == (c->file.mmap.start = mmap(NULL, c->file.mmap.length, PROT_READ, MAP_SHARED, c->file.fd, 0))) {
log_error_write(srv, __FILE__, __LINE__, "ssbd", "mmap failed: ",
strerror(errno), c->file.name, c->file.fd);
close(from_cgi_fds[0]);
close(to_cgi_fds[1]);
return -1;
}
close(c->file.fd);
c->file.fd = -1;
/* chunk_reset() or chunk_free() will cleanup for us */
}
if ((r = write(to_cgi_fds[1], c->file.mmap.start + c->offset, c->file.length - c->offset)) < 0) {
switch(errno) {
case ENOSPC:
con->http_status = 507;
break;
case EINTR:
continue;
default:
con->http_status = 403;
break;
}
}
break;
case MEM_CHUNK:
if ((r = write(to_cgi_fds[1], c->mem->ptr + c->offset, c->mem->used - c->offset - 1)) < 0) {
switch(errno) {
case ENOSPC:
con->http_status = 507;
break;
case EINTR:
continue;
default:
con->http_status = 403;
break;
}
}
break;
case UNUSED_CHUNK:
break;
}
if (r > 0) {
c->offset += r;
cq->bytes_out += r;
} else {
log_error_write(srv, __FILE__, __LINE__, "ss", "write() failed due to: ", strerror(errno));
con->http_status = 500;
break;
}
chunkqueue_remove_finished_chunks(cq);
}
}
close(to_cgi_fds[1]);
/* register PID and wait for them asyncronously */
con->mode = p->id;
buffer_reset(con->physical.path);
hctx = cgi_handler_ctx_init();
hctx->remote_conn = con;
hctx->plugin_data = p;
hctx->pid = pid;
hctx->fd = from_cgi_fds[0];
hctx->fde_ndx = -1;
con->plugin_ctx[p->id] = hctx;
fdevent_register(srv->ev, hctx->fd, cgi_handle_fdevent, hctx);
fdevent_event_set(srv->ev, &(hctx->fde_ndx), hctx->fd, FDEVENT_IN);
if (-1 == fdevent_fcntl_set(srv->ev, hctx->fd)) {
log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl failed: ", strerror(errno));
fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
fdevent_unregister(srv->ev, hctx->fd);
log_error_write(srv, __FILE__, __LINE__, "sd", "cgi close:", hctx->fd);
close(hctx->fd);
cgi_handler_ctx_free(hctx);
con->plugin_ctx[p->id] = NULL;
return -1;
}
break;
}
}
return 0;
#else
return -1;
#endif
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_cgi_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(cgi);
PATCH(execute_x_only);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("cgi.assign"))) {
PATCH(cgi);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("cgi.execute-x-only"))) {
PATCH(execute_x_only);
}
}
}
return 0;
}
#undef PATCH
URIHANDLER_FUNC(cgi_is_handled) {
size_t k, s_len;
plugin_data *p = p_d;
buffer *fn = con->physical.path;
stat_cache_entry *sce = NULL;
if (con->mode != DIRECT) return HANDLER_GO_ON;
if (fn->used == 0) return HANDLER_GO_ON;
mod_cgi_patch_connection(srv, con, p);
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) return HANDLER_GO_ON;
if (!S_ISREG(sce->st.st_mode)) return HANDLER_GO_ON;
if (p->conf.execute_x_only == 1 && (sce->st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) return HANDLER_GO_ON;
s_len = fn->used - 1;
for (k = 0; k < p->conf.cgi->used; k++) {
data_string *ds = (data_string *)p->conf.cgi->data[k];
size_t ct_len = ds->key->used - 1;
if (ds->key->used == 0) continue;
if (s_len < ct_len) continue;
if (0 == strncmp(fn->ptr + s_len - ct_len, ds->key->ptr, ct_len)) {
if (cgi_create_env(srv, con, p, ds->value)) {
con->mode = DIRECT;
con->http_status = 500;
buffer_reset(con->physical.path);
return HANDLER_FINISHED;
}
/* one handler is enough for the request */
break;
}
}
return HANDLER_GO_ON;
}
TRIGGER_FUNC(cgi_trigger) {
plugin_data *p = p_d;
size_t ndx;
/* the trigger handle only cares about lonely PID which we have to wait for */
#ifndef __WIN32
for (ndx = 0; ndx < p->cgi_pid.used; ndx++) {
int status;
switch(waitpid(p->cgi_pid.ptr[ndx], &status, WNOHANG)) {
case 0:
/* not finished yet */
#if 0
log_error_write(srv, __FILE__, __LINE__, "sd", "(debug) child isn't done yet, pid:", p->cgi_pid.ptr[ndx]);
#endif
break;
case -1:
if (errno == ECHILD) {
/* someone else called waitpid... remove the pid to stop looping the error each time */
log_error_write(srv, __FILE__, __LINE__, "s", "cgi child vanished, probably someone else called waitpid");
cgi_pid_del(srv, p, p->cgi_pid.ptr[ndx]);
ndx--;
continue;
}
log_error_write(srv, __FILE__, __LINE__, "ss", "waitpid failed: ", strerror(errno));
return HANDLER_ERROR;
default:
if (WIFEXITED(status)) {
#if 0
log_error_write(srv, __FILE__, __LINE__, "sd", "(debug) cgi exited fine, pid:", p->cgi_pid.ptr[ndx]);
#endif
} else if (WIFSIGNALED(status)) {
/* FIXME: what if we killed the CGI script with a kill(..., SIGTERM) ?
*/
if (WTERMSIG(status) != SIGTERM) {
log_error_write(srv, __FILE__, __LINE__, "sd", "cleaning up CGI: process died with signal", WTERMSIG(status));
}
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "cleaning up CGI: ended unexpectedly");
}
cgi_pid_del(srv, p, p->cgi_pid.ptr[ndx]);
/* del modified the buffer structure
* and copies the last entry to the current one
* -> recheck the current index
*/
ndx--;
}
}
#endif
return HANDLER_GO_ON;
}
/*
* - HANDLER_GO_ON : not our job
* - HANDLER_FINISHED: got response header
* - HANDLER_WAIT_FOR_EVENT: waiting for response header
*/
SUBREQUEST_FUNC(mod_cgi_handle_subrequest) {
int status;
plugin_data *p = p_d;
handler_ctx *hctx = con->plugin_ctx[p->id];
if (con->mode != p->id) return HANDLER_GO_ON;
if (NULL == hctx) return HANDLER_GO_ON;
#if 0
log_error_write(srv, __FILE__, __LINE__, "sdd", "subrequest, pid =", hctx, hctx->pid);
#endif
if (hctx->pid == 0) {
/* cgi already dead */
if (!con->file_started) return HANDLER_WAIT_FOR_EVENT;
return HANDLER_FINISHED;
}
#ifndef __WIN32
switch(waitpid(hctx->pid, &status, WNOHANG)) {
case 0:
/* we only have for events here if we don't have the header yet,
* otherwise the event-handler will send us the incoming data */
if (con->file_started) return HANDLER_FINISHED;
return HANDLER_WAIT_FOR_EVENT;
case -1:
if (errno == EINTR) return HANDLER_WAIT_FOR_EVENT;
if (errno == ECHILD && con->file_started == 0) {
/*
* second round but still not response
*/
return HANDLER_WAIT_FOR_EVENT;
}
log_error_write(srv, __FILE__, __LINE__, "ss", "waitpid failed: ", strerror(errno));
con->mode = DIRECT;
con->http_status = 500;
hctx->pid = 0;
fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
fdevent_unregister(srv->ev, hctx->fd);
if (close(hctx->fd)) {
log_error_write(srv, __FILE__, __LINE__, "sds", "cgi close failed ", hctx->fd, strerror(errno));
}
cgi_handler_ctx_free(hctx);
con->plugin_ctx[p->id] = NULL;
return HANDLER_FINISHED;
default:
/* cgi process exited
*/
hctx->pid = 0;
/* we already have response headers? just continue */
if (con->file_started) return HANDLER_FINISHED;
if (WIFEXITED(status)) {
/* clean exit - just continue */
return HANDLER_WAIT_FOR_EVENT;
}
/* cgi proc died, and we didn't get any data yet - send error message and close cgi con */
log_error_write(srv, __FILE__, __LINE__, "s", "cgi died ?");
con->http_status = 500;
con->mode = DIRECT;
fdevent_event_del(srv->ev, &(hctx->fde_ndx), hctx->fd);
fdevent_unregister(srv->ev, hctx->fd);
if (close(hctx->fd)) {
log_error_write(srv, __FILE__, __LINE__, "sds", "cgi close failed ", hctx->fd, strerror(errno));
}
cgi_handler_ctx_free(hctx);
con->plugin_ctx[p->id] = NULL;
return HANDLER_FINISHED;
}
#else
return HANDLER_ERROR;
#endif
}
int mod_cgi_plugin_init(plugin *p);
int mod_cgi_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("cgi");
p->connection_reset = cgi_connection_close_callback;
p->handle_subrequest_start = cgi_is_handled;
p->handle_subrequest = mod_cgi_handle_subrequest;
#if 0
p->handle_fdevent = cgi_handle_fdevent;
#endif
p->handle_trigger = cgi_trigger;
p->init = mod_cgi_init;
p->cleanup = mod_cgi_free;
p->set_defaults = mod_fastcgi_set_defaults;
p->data = NULL;
return 0;
}
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