1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477
|
#define MOD_SCGI_VERSION "1.2"
#define SCGI_PROTOCOL_VERSION "1"
/* #define VERBOSE_DEBUG */
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_main.h"
#include "http_protocol.h"
#include "http_request.h"
#include "util_script.h"
#include <netinet/tcp.h> /* for TCP_NODELAY */
#define UNSET 0
#define ENABLED 1
#define DISABLED 2
/*
* Configuration record. Used per-directory configuration data.
*/
typedef struct {
unsigned long addr; /* address in network byte order */
unsigned short port; /* port in network byte order */
int enabled; /* mod_scgi enabled from this directory */
} scgi_cfg;
/*
* Declare ourselves so the configuration routines can find and know us.
* We'll fill it in at the end of the module.
*/
module MODULE_VAR_EXPORT scgi_module;
/*
* Locate our directory configuration record for the current request.
*/
static scgi_cfg *our_dconfig(request_rec *r)
{
return (scgi_cfg *) ap_get_module_config(r->per_dir_config, &scgi_module);
}
static int scgi_trans(request_rec *r)
{
scgi_cfg *cfg = our_dconfig(r);
if (cfg->enabled == ENABLED) {
r->handler = "scgi-handler";
return OK;
}
return DECLINED;
}
int open_socket(request_rec *r, scgi_cfg *cfg)
{
int retries, sleeptime, rv;
struct sockaddr_in addr;
int sock;
if (cfg->addr == UNSET)
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
else
addr.sin_addr.s_addr = cfg->addr;
if (cfg->port == UNSET)
addr.sin_port = htons(4000);
else
addr.sin_port = cfg->port;
addr.sin_family = AF_INET;
/* create the socket */
sock = ap_psocket(r->pool, AF_INET, SOCK_STREAM, 0);
if (sock == -1)
return -1;
/* try to connect */
retries = 4;
sleeptime = 1;
restart:
rv = connect(sock, (struct sockaddr *)&addr, sizeof addr);
if (rv != 0) {
if (errno == EINTR)
goto restart; /* signals suck */
if (errno == ECONNREFUSED && retries > 0) {
/* server may be temporarily down, retry */
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r,
"scgi: connection refused, retrying");
sleep(sleeptime);
--retries;
sleeptime *= 2;
goto restart;
}
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"scgi: connecting to server");
return -1;
}
#ifdef TCP_NODELAY
if (addr.sin_family == AF_INET) {
/* disable Nagle */
int set = 1;
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&set, sizeof(set));
}
#endif
return sock;
}
static char *lookup_name(table *t, const char *name)
{
array_header *hdrs_arr;
table_entry *hdrs;
int i;
hdrs_arr = ap_table_elts(t);
hdrs = (table_entry *)hdrs_arr->elts;
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (hdrs[i].key == NULL) {
continue;
}
if (strcasecmp(hdrs[i].key, name) == 0) {
return hdrs[i].val;
}
}
return NULL;
}
static char *lookup_header(request_rec *r, const char *name)
{
return lookup_name(r->headers_in, name);
}
static char *lookup_env(request_rec *r, const char *name)
{
return lookup_name(r->subprocess_env, name);
}
static char *original_uri(request_rec *r)
{
char *first, *last;
if (r->the_request == NULL) {
return (char *) ap_pcalloc(r->pool, 1);
}
first = r->the_request; /* use the request-line */
while (*first && !ap_isspace(*first)) {
++first; /* skip over the method */
}
while (ap_isspace(*first)) {
++first; /* and the space(s) */
}
last = first;
while (*last && !ap_isspace(*last)) {
++last; /* end at next whitespace */
}
return ap_pstrndup(r->pool, first, last - first);
}
static void log_err(request_rec *r, const char *msg)
{
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"scgi: %s", msg);
}
static void log_debug(request_rec *r, const char *msg)
{
#ifdef VERBOSE_DEBUG
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r,
"scgi: %s", msg);
#endif
}
static void add_header(table *t, const char *name, const char *value)
{
if (name != NULL && value != NULL) {
ap_table_addn(t, name, value);
}
}
static int send_headers(request_rec *r, BUFF *f, scgi_cfg *cfg)
{
table *t = ap_make_table(r->pool, 40); /* headers to send */
array_header *hdrs_arr;
table_entry *hdrs;
int i;
unsigned long n;
log_debug(r, "sending headers");
/* CONTENT_LENGTH must come first and always be present */
add_header(t, "CONTENT_LENGTH",
ap_psprintf(r->pool, "%ld", r->remaining));
add_header(t, "SCGI", SCGI_PROTOCOL_VERSION);
add_header(t, "SERVER_SOFTWARE", ap_get_server_version());
add_header(t, "SERVER_PROTOCOL", r->protocol);
add_header(t, "SERVER_NAME", ap_get_server_name(r));
add_header(t, "SERVER_ADMIN", r->server->server_admin);
add_header(t, "SERVER_ADDR", r->connection->local_ip);
add_header(t, "SERVER_PORT",
ap_psprintf(r->pool, "%u", ap_get_server_port(r)));
add_header(t, "REMOTE_ADDR", r->connection->remote_ip);
add_header(t, "REMOTE_PORT",
ap_psprintf(r->pool, "%d",
ntohs(r->connection->remote_addr.sin_port)));
add_header(t, "REMOTE_USER", r->connection->user);
add_header(t, "REQUEST_METHOD", r->method);
add_header(t, "REQUEST_URI", original_uri(r));
add_header(t, "QUERY_STRING", r->args ? r->args : "");
add_header(t, "SCRIPT_NAME", r->uri);
/* skip PATH_INFO, it's always empty */
add_header(t, "HTTPS", lookup_env(r, "HTTPS"));
add_header(t, "CONTENT_TYPE", lookup_header(r, "Content-type"));
add_header(t, "DOCUMENT_ROOT", ap_document_root(r));
add_header(t, "HTTP_ACCEPT", lookup_header(r, "Accept"));
add_header(t, "HTTP_ACCEPT_CHARSET",
lookup_header(r, "Accept-Charset"));
add_header(t, "HTTP_ACCEPT_ENCODING",
lookup_header(r, "Accept-Encoding"));
add_header(t, "HTTP_ACCEPT_LANGUAGE",
lookup_header(r, "Accept-Language"));
add_header(t, "HTTP_AUTHORIZATION", lookup_header(r, "Authorization"));
add_header(t, "HTTP_COOKIE", lookup_header(r, "Cookie"));
add_header(t, "HTTP_EXPECT", lookup_header(r, "Expect"));
add_header(t, "HTTP_FROM", lookup_header(r, "From"));
add_header(t, "HTTP_HOST", lookup_header(r, "Host"));
add_header(t, "HTTP_IF_MATCH", lookup_header(r, "If-Match"));
add_header(t, "HTTP_IF_MODIFIED_SINCE",
lookup_header(r, "If-Modified-Since"));
add_header(t, "HTTP_IF_NONE_MATCH", lookup_header(r, "If-None-Match"));
add_header(t, "HTTP_IF_RANGE", lookup_header(r, "If-Range"));
add_header(t, "HTTP_IF_UNMODIFIED_SINCE",
lookup_header(r, "If-Unmodified-Since"));
add_header(t, "HTTP_RANGE", lookup_header(r, "Range"));
add_header(t, "HTTP_REFERER", lookup_header(r, "Referer"));
add_header(t, "HTTP_TE", lookup_header(r, "TE"));
add_header(t, "HTTP_USER_AGENT", lookup_header(r, "User-Agent"));
hdrs_arr = ap_table_elts(t);
hdrs = (table_entry *)hdrs_arr->elts;
/* calculate length of header data (including nulls) */
n = 0;
for (i = 0; i < hdrs_arr->nelts; ++i) {
n += strlen(hdrs[i].key) + 1;
n += strlen(hdrs[i].val) + 1;
}
/* send header data as netstring */
if (ap_bprintf(f, "%lu:", n) < 0) {
return 0;
}
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (ap_bputs(hdrs[i].key, f) < 0) return 0;
if (ap_bputc('\0', f) < 0) return 0;
if (ap_bputs(hdrs[i].val, f) < 0) return 0;
if (ap_bputc('\0', f) < 0) return 0;
}
if (ap_bputc(',', f) < 0) return 0;
return 1;
}
static int send_request_body (request_rec *r, BUFF *f)
{
if (ap_should_client_block(r)) {
int n;
char buffer[HUGE_STRING_LEN];
while ((n = ap_get_client_block(r, buffer,
sizeof buffer)) > 0) {
if (ap_bwrite(f, buffer, n) != n) return 0;
ap_reset_timeout(r);
}
}
if (ap_bflush(f) < 0) return 0;
return 1;
}
static int scgi_handler(request_rec *r)
{
int ret, sock;
BUFF *f;
char *request_body = NULL;
const char *location;
scgi_cfg *cfg = our_dconfig(r);
if ((ret = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR))) {
return ret;
}
/* connect to scgi server */
ap_hard_timeout("scgi connect", r);
log_debug(r, "connecting to server");
sock = open_socket(r, cfg);
if (sock == -1) {
if (request_body)
free(request_body);
return SERVER_ERROR;
}
ap_kill_timeout(r);
f = ap_bcreate(r->pool, B_RDWR | B_SOCKET);
ap_bpushfd(f, sock, sock);
ap_hard_timeout("scgi sending request", r);
/* send headers */
if (!send_headers(r, f, cfg)) {
log_err(r, "error sending response headers");
return SERVER_ERROR;
}
/* send request data */
if (!send_request_body(r, f)) {
log_err(r, "error sending response body");
return SERVER_ERROR;
}
ap_kill_timeout(r);
log_debug(r, "reading response headers");
if (ap_scan_script_header_err_buff(r, f, NULL) != 0) {
log_err(r, "error reading response headers");
return SERVER_ERROR;
}
location = ap_table_get(r->headers_out, "Location");
if (location && location[0] == '/' &&
((r->status == HTTP_OK) || ap_is_HTTP_REDIRECT(r->status))) {
ap_bclose(f);
/* Internal redirect -- fake-up a pseudo-request */
r->status = HTTP_OK;
/* This redirect needs to be a GET no matter what the original
* method was.
*/
r->method = ap_pstrdup(r->pool, "GET");
r->method_number = M_GET;
ap_internal_redirect_handler(location, r);
return OK;
}
/* write headers to client */
ap_send_http_header(r);
/* write body to client */
if (!r->header_only) {
ap_send_fb(f, r);
}
ap_bclose(f);
return OK;
}
static void scgi_init(server_rec *s, pool *p)
{
ap_add_version_component("mod_scgi/" MOD_SCGI_VERSION);
}
static void *scgi_create_dir_config(pool *p, char *dirspec)
{
scgi_cfg *cfg = (scgi_cfg *) ap_pcalloc(p, sizeof(scgi_cfg));
cfg->enabled = UNSET;
cfg->addr = UNSET;
cfg->port = UNSET;
return (void *) cfg;
}
#define MERGE(b, n, a) (n->a == UNSET ? b->a : n->a)
static void *
scgi_merge_dir_config(pool *p, void *basev, void *newv)
{
scgi_cfg *base, *new;
scgi_cfg *cfg = (scgi_cfg *) ap_pcalloc(p, sizeof(scgi_cfg));
base = (scgi_cfg *) basev;
new = (scgi_cfg *) newv;
cfg->enabled = MERGE(base, new, enabled);
cfg->addr = MERGE(base, new, addr);
cfg->port = MERGE(base, new, port);
return (void *) cfg;
}
static const char *
cmd_server(cmd_parms *cmd, scgi_cfg *dcfg, char *addr, char *port)
{
int n;
char *tmp;
if (cmd->path == NULL) { /* server command */
return "not a server command";
}
if ((dcfg->addr = inet_addr(addr)) == INADDR_NONE)
return "Invalid syntax for server address";
n = strtol(port, &tmp, 0);
if (tmp[0] != 0 || n < 0 || n > 65535)
return "Invalid server port";
dcfg->port = htons((unsigned short) n);
return NULL;
}
static const char *
cmd_handler(cmd_parms *cmd, scgi_cfg *dcfg, int flag)
{
if (cmd->path == NULL) { /* server command */
return "not a server command";
}
if (flag) {
dcfg->enabled = ENABLED;
}
else {
dcfg->enabled = DISABLED;
}
return NULL;
}
static const command_rec scgi_cmds[] =
{
{ "SCGIServer", cmd_server, NULL, ACCESS_CONF, TAKE2,
"address and port of an SCGI server (e.g. 127.0.0.1 4000)"},
{ "SCGIHandler", cmd_handler, NULL, ACCESS_CONF, FLAG,
"On or Off to enable or disable the SCGI handler"},
{NULL}
};
static const handler_rec scgi_handlers[] =
{
{"scgi-handler", scgi_handler},
{NULL}
};
module scgi_module =
{
STANDARD_MODULE_STUFF,
scgi_init, /* module initializer */
scgi_create_dir_config, /* per-directory config creator */
scgi_merge_dir_config, /* dir config merger */
NULL, /* server config creator */
NULL, /* server config merger */
scgi_cmds, /* command table */
scgi_handlers, /* [7] list of handlers */
scgi_trans, /* [2] filename-to-URI translation */
NULL, /* [5] check/validate user_id */
NULL, /* [6] check user_id is valid *here* */
NULL, /* [4] check access by host address */
NULL, /* [7] MIME type checker/setter */
NULL, /* [8] fixups */
NULL, /* [10] logger */
#if MODULE_MAGIC_NUMBER >= 19970103
NULL, /* [3] header parser */
#endif
#if MODULE_MAGIC_NUMBER >= 19970719
NULL, /* process initializer */
#endif
#if MODULE_MAGIC_NUMBER >= 19970728
NULL, /* process exit/cleanup */
#endif
#if MODULE_MAGIC_NUMBER >= 19970902
NULL /* [1] post read_request handling */
#endif
};
|