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mod_proxy_uwsgi.c
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mod_proxy_uwsgi.c
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/*
*** mod_proxy_uwsgi ***
To build:
apxs2 -i -c mod_proxy_uwsgi.c
To use:
LoadModule proxy_uwsgi_module /usr/lib/apache2/modules/mod_proxy_uwsgi.so
ProxyPass / uwsgi://127.0.0.1:3031/
Docs:
https://uwsgi-docs.readthedocs.io/en/latest/Apache.html#mod-proxy-uwsgi
*/
#define APR_WANT_MEMFUNC
#define APR_WANT_STRFUNC
#include "apr_strings.h"
#include "apr_hooks.h"
#include "apr_optional_hooks.h"
#include "apr_buckets.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_request.h"
#include "util_script.h"
#include "mod_proxy.h"
#define UWSGI_SCHEME "uwsgi"
#define UWSGI_DEFAULT_PORT 3031
module AP_MODULE_DECLARE_DATA proxy_uwsgi_module;
static int uwsgi_canon(request_rec *r, char *url)
{
char *host, sport[sizeof(":65535")];
const char *err, *path;
apr_port_t port = UWSGI_DEFAULT_PORT;
if (strncasecmp(url, UWSGI_SCHEME "://", sizeof(UWSGI_SCHEME) + 2)) {
return DECLINED;
}
url += sizeof(UWSGI_SCHEME); /* Keep slashes */
err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
if (err) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"error parsing URL %s: %s", url, err);
return HTTP_BAD_REQUEST;
}
if (port != UWSGI_DEFAULT_PORT)
apr_snprintf(sport, sizeof(sport), ":%u", port);
else
sport[0] = '\0';
if (ap_strchr(host, ':')) { /* if literal IPv6 address */
host = apr_pstrcat(r->pool, "[", host, "]", NULL);
}
path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0,
r->proxyreq);
if (!path) {
return HTTP_BAD_REQUEST;
}
r->filename = apr_pstrcat(r->pool, "proxy:" UWSGI_SCHEME "://", host, sport, "/",
path, NULL);
return OK;
}
static int uwsgi_send(proxy_conn_rec *conn, const char *buf, apr_size_t length,
request_rec *r)
{
apr_status_t rv;
apr_size_t written;
while (length > 0) {
written = length;
if ((rv = apr_socket_send(conn->sock, buf, &written)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"sending data to %s:%u failed",
conn->hostname, conn->port);
return HTTP_SERVICE_UNAVAILABLE;
}
/* count for stats */
conn->worker->s->transferred += written;
buf += written;
length -= written;
}
return OK;
}
/*
* Send uwsgi header block
*/
static int uwsgi_send_headers(request_rec *r, proxy_conn_rec *conn)
{
char *buf, *ptr;
const apr_array_header_t *env_table;
const apr_table_entry_t *env;
int j;
apr_size_t headerlen = 4;
uint16_t pktsize, keylen, vallen;
ap_add_common_vars(r);
ap_add_cgi_vars(r);
// this is not a security problem (in Linux) as uWSGI destroy the env memory area readable in /proc
// and generally if you host untrusted apps in your server and allows them to read others uid /proc/<pid>
// files you have higher problems...
const char *auth = apr_table_get(r->headers_in, "Authorization");
if (auth) {
apr_table_setn(r->subprocess_env, "HTTP_AUTHORIZATION", auth);
}
const char *script_name = apr_table_get(r->subprocess_env, "SCRIPT_NAME");
const char *path_info = apr_table_get(r->subprocess_env, "PATH_INFO");
if (script_name && path_info) {
if (strcmp(path_info, "/")) {
apr_table_set(r->subprocess_env, "SCRIPT_NAME", apr_pstrndup(r->pool, script_name, strlen(script_name)-strlen(path_info)));
}
else {
if (!strcmp(script_name, "/")) {
apr_table_set(r->subprocess_env, "SCRIPT_NAME", "");
}
}
}
env_table = apr_table_elts(r->subprocess_env);
env = (apr_table_entry_t *)env_table->elts;
for (j = 0; j < env_table->nelts; ++j) {
headerlen += 2 + strlen(env[j].key) + 2 + strlen(env[j].val) ;
}
ptr = buf = apr_palloc(r->pool, headerlen);
ptr+=4;
for (j = 0; j < env_table->nelts; ++j) {
keylen = strlen(env[j].key);
*ptr++= (uint8_t) (keylen & 0xff);
*ptr++= (uint8_t) ((keylen >> 8) & 0xff);
memcpy(ptr, env[j].key, keylen) ; ptr+=keylen;
vallen = strlen(env[j].val);
*ptr++= (uint8_t) (vallen & 0xff);
*ptr++= (uint8_t) ((vallen >> 8) & 0xff);
memcpy(ptr, env[j].val, vallen) ; ptr+=vallen;
}
pktsize = headerlen-4;
buf[0] = 0;
buf[1] = (uint8_t) (pktsize & 0xff);
buf[2] = (uint8_t) ((pktsize >> 8) & 0xff);
buf[3] = 0;
return uwsgi_send(conn, buf, headerlen, r);
}
static int uwsgi_send_body(request_rec *r, proxy_conn_rec *conn)
{
if (ap_should_client_block(r)) {
char *buf = apr_palloc(r->pool, AP_IOBUFSIZE);
int status;
apr_size_t readlen;
readlen = ap_get_client_block(r, buf, AP_IOBUFSIZE);
while (readlen > 0) {
status = uwsgi_send(conn, buf, readlen, r);
if (status != OK) {
return HTTP_SERVICE_UNAVAILABLE;
}
readlen = ap_get_client_block(r, buf, AP_IOBUFSIZE);
}
if (readlen == -1) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"receiving request body failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
return OK;
}
#if AP_MODULE_MAGIC_AT_LEAST(20111130,0)
static request_rec *ap_proxy_make_fake_req(conn_rec *c, request_rec *r)
{
apr_pool_t *pool;
request_rec *rp;
apr_pool_create(&pool, c->pool);
rp = apr_pcalloc(pool, sizeof(*r));
rp->pool = pool;
rp->status = HTTP_OK;
rp->headers_in = apr_table_make(pool, 50);
rp->subprocess_env = apr_table_make(pool, 50);
rp->headers_out = apr_table_make(pool, 12);
rp->err_headers_out = apr_table_make(pool, 5);
rp->notes = apr_table_make(pool, 5);
rp->server = r->server;
rp->log = r->log;
rp->proxyreq = r->proxyreq;
rp->request_time = r->request_time;
rp->connection = c;
rp->output_filters = c->output_filters;
rp->input_filters = c->input_filters;
rp->proto_output_filters = c->output_filters;
rp->proto_input_filters = c->input_filters;
rp->useragent_ip = c->client_ip;
rp->useragent_addr = c->client_addr;
rp->request_config = ap_create_request_config(pool);
proxy_run_create_req(r, rp);
return rp;
}
apr_status_t ap_proxy_buckets_lifetime_transform(request_rec *r,
apr_bucket_brigade *from, apr_bucket_brigade *to)
{
apr_bucket *e;
apr_bucket *new;
const char *data;
apr_size_t bytes;
apr_status_t rv = APR_SUCCESS;
apr_brigade_cleanup(to);
for (e = APR_BRIGADE_FIRST(from);
e != APR_BRIGADE_SENTINEL(from);
e = APR_BUCKET_NEXT(e)) {
if (!APR_BUCKET_IS_METADATA(e)) {
apr_bucket_read(e, &data, &bytes, APR_BLOCK_READ);
new = apr_bucket_transient_create(data, bytes, r->connection->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else if (APR_BUCKET_IS_FLUSH(e)) {
new = apr_bucket_flush_create(r->connection->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else if (APR_BUCKET_IS_EOS(e)) {
new = apr_bucket_eos_create(r->connection->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(to, new);
}
else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00964)
"Unhandled bucket type of type %s in"
" proxy_buckets_lifetime_transform", e->type->name);
apr_bucket_delete(e);
rv = APR_EGENERAL;
}
}
return rv;
}
#endif
static int uwsgi_response(request_rec *r, proxy_conn_rec *backend, proxy_server_conf *conf)
{
char buffer[HUGE_STRING_LEN];
const char *buf;
char *value, *end;
int len;
int backend_broke = 0;
apr_status_t rc;
conn_rec *c = r->connection;
apr_off_t readbytes;
apr_status_t rv;
apr_bucket *e;
apr_read_type_e mode = APR_NONBLOCK_READ;
request_rec *rp = ap_proxy_make_fake_req(backend->connection, r);
rp->proxyreq = PROXYREQ_RESPONSE;
apr_bucket_brigade *bb = apr_brigade_create(r->pool, c->bucket_alloc);
apr_bucket_brigade *pass_bb = apr_brigade_create(r->pool, c->bucket_alloc);
len = ap_getline(buffer, sizeof(buffer), rp, 1);
if (len <= 0) {
/* invalid or empty */
return HTTP_INTERNAL_SERVER_ERROR;
}
backend->worker->s->read += len;
if ((apr_size_t)len >= sizeof(buffer)) {
/* too long */
return HTTP_INTERNAL_SERVER_ERROR;
}
/* Position of http status code */
int status_start;
if (apr_date_checkmask(buffer, "HTTP/#.# ###*")) {
status_start = 9;
} else if (apr_date_checkmask(buffer, "HTTP/# ###*")) {
status_start = 7;
} else {
/* not HTTP */
return HTTP_BAD_GATEWAY;
}
int status_end = status_start + 3;
char keepchar = buffer[status_end];
buffer[status_end] = '\0';
r->status = atoi(&buffer[status_start]);
if (keepchar != '\0') {
buffer[status_end] = keepchar;
} else {
/* 2616 requires the space in Status-Line; the origin
* server may have sent one but ap_rgetline_core will
* have stripped it. */
buffer[status_end] = ' ';
buffer[status_end+1] = '\0';
}
r->status_line = apr_pstrdup(r->pool, &buffer[status_start]);
/* parse headers */
while ((len = ap_getline(buffer, sizeof(buffer), rp, 1)) > 0) {
if ((apr_size_t)len >= sizeof(buffer)) {
/* too long */
len = -1;
break;
}
value = strchr(buffer, ':');
if (!value) {
/* invalid header */
len = -1;
break;
}
*value++ = '\0';
if (*ap_scan_http_token(buffer)) {
/* invalid name */
len = -1;
break;
}
while (apr_isspace(*value)) ++value;
for (end = &value[strlen(value)-1]; end > value && apr_isspace(*end); --end) *end = '\0';
if (*ap_scan_http_field_content(value)) {
/* invalid value */
len = -1;
break;
}
apr_table_add(r->headers_out, buffer, value);
}
if (len < 0) {
/* Reset headers, but not to NULL because things below the chain expect
* this to be non NULL e.g. the ap_content_length_filter.
*/
r->headers_out = apr_table_make(r->pool, 1);
return HTTP_BAD_GATEWAY;
}
/* T-E wins over C-L */
if (apr_table_get(r->headers_out, "Transfer-Encoding")) {
apr_table_unset(r->headers_out, "Content-Length");
backend->close = 1;
}
if ((buf = apr_table_get(r->headers_out, "Content-Type"))) {
ap_set_content_type(r, apr_pstrdup(r->pool, buf));
}
// honor ProxyErrorOverride and ErrorDocument
#if AP_MODULE_MAGIC_AT_LEAST(20101106,0)
proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
if (dconf->error_override && ap_is_HTTP_ERROR(r->status)) {
#else
if (conf->error_override && ap_is_HTTP_ERROR(r->status)) {
#endif
int status = r->status;
r->status = HTTP_OK;
r->status_line = NULL;
apr_brigade_cleanup(bb);
apr_brigade_cleanup(pass_bb);
return status;
}
int finish = 0;
while(!finish) {
rv = ap_get_brigade(rp->input_filters, bb,
AP_MODE_READBYTES, mode,
conf->io_buffer_size);
if (APR_STATUS_IS_EAGAIN(rv)
|| (rv == APR_SUCCESS && APR_BRIGADE_EMPTY(bb)) ) {
e = apr_bucket_flush_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
if (ap_pass_brigade(r->output_filters, bb) || c->aborted) {
break;
}
apr_brigade_cleanup(bb);
mode = APR_BLOCK_READ;
continue;
}
else if (rv == APR_EOF) {
break;
}
else if (rv != APR_SUCCESS) {
ap_proxy_backend_broke(r, bb);
ap_pass_brigade(r->output_filters, bb);
backend_broke = 1;
break;
}
mode = APR_NONBLOCK_READ;
apr_brigade_length(bb, 0, &readbytes);
backend->worker->s->read += readbytes;
if (APR_BRIGADE_EMPTY(bb)) {
apr_brigade_cleanup(bb);
break;
}
ap_proxy_buckets_lifetime_transform(r, bb, pass_bb);
// found the last brigade?
if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(bb))) finish = 1;
// do not pass chunk if it is zero_sized
apr_brigade_length(pass_bb, 0, &readbytes);
if ((readbytes > 0 && ap_pass_brigade(r->output_filters, pass_bb) != APR_SUCCESS) || c->aborted) {
finish = 1;
}
apr_brigade_cleanup(bb);
apr_brigade_cleanup(pass_bb);
}
e = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, e);
ap_pass_brigade(r->output_filters, bb);
apr_brigade_cleanup(bb);
if (c->aborted || backend_broke) {
return DONE;
}
return OK;
}
static int uwsgi_handler(request_rec *r, proxy_worker *worker,
proxy_server_conf *conf, char *url,
const char *proxyname, apr_port_t proxyport)
{
int status;
proxy_conn_rec *backend = NULL;
apr_pool_t *p = r->pool;
apr_uri_t *uri = apr_palloc(r->pool, sizeof(*uri));
char server_portstr[32];
if (strncasecmp(url, UWSGI_SCHEME "://", sizeof(UWSGI_SCHEME) + 2)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
"declining URL %s", url);
return DECLINED;
}
// ADD PATH_INFO
#if AP_MODULE_MAGIC_AT_LEAST(20111130,0)
size_t w_len = strlen(worker->s->name);
#else
size_t w_len = strlen(worker->name);
#endif
char *u_path_info = r->filename + 6 + w_len;
int delta = 0;
if (u_path_info[0] != '/') {
delta = 1;
}
int decode_status = ap_unescape_url(url+w_len-delta);
if (decode_status) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"unable to decode uri: %s",
url+w_len-delta);
return HTTP_INTERNAL_SERVER_ERROR;
}
apr_table_add(r->subprocess_env, "PATH_INFO", url+w_len-delta);
/* Create space for state information */
status = ap_proxy_acquire_connection(UWSGI_SCHEME, &backend, worker,
r->server);
if (status != OK) {
goto cleanup;
}
backend->is_ssl = 0;
/* Step One: Determine Who To Connect To */
status = ap_proxy_determine_connection(p, r, conf, worker, backend,
uri, &url, proxyname, proxyport,
server_portstr, sizeof(server_portstr));
if (status != OK) {
goto cleanup;
}
/* Step Two: Make the Connection */
if (ap_proxy_connect_backend(UWSGI_SCHEME, backend, worker, r->server)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"failed to make connection to backend: %s:%u",
backend->hostname, backend->port);
status = HTTP_SERVICE_UNAVAILABLE;
goto cleanup;
}
/* Step Three: Create conn_rec */
if (!backend->connection) {
if ((status = ap_proxy_connection_create(UWSGI_SCHEME, backend,
r->connection, r->server)) != OK)
goto cleanup;
}
/* Step Four: Process the Request */
if ( ((status = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)) != OK)
|| ((status = uwsgi_send_headers(r, backend)) != OK)
|| ((status = uwsgi_send_body(r, backend)) != OK)
|| ((status = uwsgi_response(r, backend, conf)) != OK)) {
goto cleanup;
}
cleanup:
if (backend) {
backend->close = 1; /* always close the socket */
ap_proxy_release_connection(UWSGI_SCHEME, backend, r->server);
}
return status;
}
static void register_hooks(apr_pool_t *p)
{
proxy_hook_scheme_handler(uwsgi_handler, NULL, NULL, APR_HOOK_FIRST);
proxy_hook_canon_handler(uwsgi_canon, NULL, NULL, APR_HOOK_FIRST);
}
module AP_MODULE_DECLARE_DATA proxy_uwsgi_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
NULL, /* command table */
register_hooks /* register hooks */
};