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lighttpd1.4/src/http-header-glue.c

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#include "first.h"
#include "sys-time.h"
#include "base.h"
#include "array.h"
#include "buffer.h"
#include "chunk.h"
#include "fdevent.h"
#include "log.h"
#include "http_chunk.h"
#include "http_date.h"
#include "http_etag.h"
#include "http_header.h"
#include "response.h"
#include "sock_addr.h"
#include "stat_cache.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include "sys-socket.h"
#include <unistd.h>
/**
* max size of the HTTP response header from backends
* (differs from server.max-request-field-size for max request field size)
*/
#define MAX_HTTP_RESPONSE_FIELD_SIZE 65535
__attribute_cold__
int http_response_buffer_append_authority(request_st * const r, buffer * const o) {
if (!buffer_string_is_empty(&r->uri.authority)) {
buffer_append_string_buffer(o, &r->uri.authority);
} else {
/* get the name of the currently connected socket */
sock_addr our_addr;
socklen_t our_addr_len;
our_addr.plain.sa_family = 0;
our_addr_len = sizeof(our_addr);
if (-1 == getsockname(r->con->fd, (struct sockaddr *)&our_addr, &our_addr_len)
|| our_addr_len > (socklen_t)sizeof(our_addr)) {
r->http_status = 500;
log_perror(r->conf.errh, __FILE__, __LINE__, "can't get sockname");
return -1;
}
if (our_addr.plain.sa_family == AF_INET
&& our_addr.ipv4.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
static char lhost[32];
static size_t lhost_len = 0;
if (0 != lhost_len) {
buffer_append_string_len(o, lhost, lhost_len);
}
else {
size_t olen = buffer_string_length(o);
if (0 == sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) {
lhost_len = buffer_string_length(o) - olen;
if (lhost_len < sizeof(lhost)) {
memcpy(lhost, o->ptr+olen, lhost_len+1); /*(+1 for '\0')*/
}
else {
lhost_len = 0;
}
}
else {
lhost_len = sizeof("localhost")-1;
memcpy(lhost, "localhost", lhost_len+1); /*(+1 for '\0')*/
buffer_append_string_len(o, lhost, lhost_len);
}
}
} else if (!buffer_string_is_empty(r->server_name)) {
buffer_append_string_buffer(o, r->server_name);
} else
/* Lookup name: secondly try to get hostname for bind address */
if (0 != sock_addr_nameinfo_append_buffer(o, &our_addr, r->conf.errh)) {
r->http_status = 500;
return -1;
}
{
unsigned short listen_port = sock_addr_get_port(&our_addr);
unsigned short default_port = 80;
if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) {
default_port = 443;
}
if (0 == listen_port) listen_port = r->con->srv->srvconf.port;
if (default_port != listen_port) {
buffer_append_string_len(o, CONST_STR_LEN(":"));
buffer_append_int(o, listen_port);
}
}
}
return 0;
}
int http_response_redirect_to_directory(request_st * const r, int status) {
buffer *o = r->tmp_buf;
buffer_clear(o);
/* XXX: store flag in global at startup? */
if (r->con->srv->srvconf.absolute_dir_redirect) {
buffer_copy_buffer(o, &r->uri.scheme);
buffer_append_string_len(o, CONST_STR_LEN("://"));
if (0 != http_response_buffer_append_authority(r, o)) {
return -1;
}
}
buffer_append_string_encoded(o, CONST_BUF_LEN(&r->uri.path), ENCODING_REL_URI);
buffer_append_string_len(o, CONST_STR_LEN("/"));
if (!buffer_string_is_empty(&r->uri.query)) {
buffer_append_string_len(o, CONST_STR_LEN("?"));
buffer_append_string_buffer(o, &r->uri.query);
}
if (status >= 300) {
http_header_response_set(r, HTTP_HEADER_LOCATION,
CONST_STR_LEN("Location"),
CONST_BUF_LEN(o));
r->http_status = status;
r->resp_body_finished = 1;
}
else {
http_header_response_set(r, HTTP_HEADER_CONTENT_LOCATION,
CONST_STR_LEN("Content-Location"),
CONST_BUF_LEN(o));
}
return 0;
}
#define MTIME_CACHE_MAX 16
struct mtime_cache_type {
time_t mtime; /* key */
buffer str; /* buffer for string representation */
};
static struct mtime_cache_type mtime_cache[MTIME_CACHE_MAX];
static char mtime_cache_str[MTIME_CACHE_MAX][30];
/* 30-chars for "%a, %d %b %Y %H:%M:%S GMT" */
void strftime_cache_reset(void) {
for (int i = 0; i < MTIME_CACHE_MAX; ++i) {
mtime_cache[i].mtime = (time_t)-1;
mtime_cache[i].str.ptr = mtime_cache_str[i];
mtime_cache[i].str.used = sizeof(mtime_cache_str[0]);
mtime_cache[i].str.size = sizeof(mtime_cache_str[0]);
}
}
static const buffer * strftime_cache_get(const time_t last_mod) {
static int mtime_cache_idx;
for (int j = 0; j < MTIME_CACHE_MAX; ++j) {
if (mtime_cache[j].mtime == last_mod)
return &mtime_cache[j].str; /* found cache-entry */
}
if (++mtime_cache_idx == MTIME_CACHE_MAX) mtime_cache_idx = 0;
const int i = mtime_cache_idx;
http_date_time_to_str(mtime_cache[i].str.ptr, sizeof(mtime_cache_str[0]),
(mtime_cache[i].mtime = last_mod));
return &mtime_cache[i].str;
}
const buffer * http_response_set_last_modified(request_st * const r, const time_t lmtime) {
const buffer * const mtime = strftime_cache_get(lmtime);
http_header_response_set(r, HTTP_HEADER_LAST_MODIFIED,
CONST_STR_LEN("Last-Modified"),
CONST_BUF_LEN(mtime));
#if 0
return http_header_response_get(r, HTTP_HEADER_LAST_MODIFIED,
CONST_STR_LEN("Last-Modified"));
#else
return mtime;
#endif
}
int http_response_handle_cachable(request_st * const r, const buffer * const lmod, const time_t lmtime) {
const buffer *vb;
/*
* 14.26 If-None-Match
* [...]
* If none of the entity tags match, then the server MAY perform the
* requested method as if the If-None-Match header field did not exist,
* but MUST also ignore any If-Modified-Since header field(s) in the
* request. That is, if no entity tags match, then the server MUST NOT
* return a 304 (Not Modified) response.
*/
if ((vb = http_header_request_get(r, HTTP_HEADER_IF_NONE_MATCH,
CONST_STR_LEN("If-None-Match")))) {
/*(weak etag comparison must not be used for ranged requests)*/
int range_request = (0 != light_btst(r->rqst_htags, HTTP_HEADER_RANGE));
if (http_etag_matches(&r->physical.etag, vb->ptr, !range_request)) {
if (http_method_get_or_head(r->http_method)) {
r->http_status = 304;
return HANDLER_FINISHED;
} else {
r->http_status = 412;
r->handler_module = NULL;
return HANDLER_FINISHED;
}
}
} else if (http_method_get_or_head(r->http_method)
&& (vb = http_header_request_get(r, HTTP_HEADER_IF_MODIFIED_SINCE,
CONST_STR_LEN("If-Modified-Since")))) {
/* last-modified handling */
if (buffer_is_equal(lmod, vb)
|| !http_date_if_modified_since(CONST_BUF_LEN(vb), lmtime)) {
r->http_status = 304;
return HANDLER_FINISHED;
}
}
return HANDLER_GO_ON;
}
void http_response_body_clear (request_st * const r, int preserve_length) {
r->resp_send_chunked = 0;
r->resp_body_scratchpad = -1;
if (light_btst(r->resp_htags, HTTP_HEADER_TRANSFER_ENCODING)) {
http_header_response_unset(r, HTTP_HEADER_TRANSFER_ENCODING,
CONST_STR_LEN("Transfer-Encoding"));
}
if (!preserve_length) { /* preserve for HEAD responses and no-content responses (204, 205, 304) */
if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) {
http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"));
}
/*(if not preserving Content-Length, do not preserve trailers, if any)*/
r->resp_decode_chunked = 0;
if (r->gw_dechunk) {
free(r->gw_dechunk->b.ptr);
free(r->gw_dechunk);
r->gw_dechunk = NULL;
}
}
chunkqueue_reset(&r->write_queue);
}
static void http_response_header_clear (request_st * const r) {
r->http_status = 0;
r->resp_htags = 0;
r->resp_header_len = 0;
r->resp_header_repeated = 0;
array_reset_data_strings(&r->resp_headers);
/* Note: http_response_body_clear(r, 0) is not called here
* r->write_queue should be preserved for additional data after 1xx response
* However, if http_response_process_headers() was called and response had
* Transfer-Encoding: chunked set, then other items need to be reset */
r->resp_send_chunked = 0;
r->resp_decode_chunked = 0;
r->resp_body_scratchpad = -1;
if (r->gw_dechunk) {
free(r->gw_dechunk->b.ptr);
free(r->gw_dechunk);
r->gw_dechunk = NULL;
}
}
void http_response_reset (request_st * const r) {
r->http_status = 0;
r->con->is_writable = 1;
r->resp_body_finished = 0;
r->resp_body_started = 0;
r->handler_module = NULL;
if (r->physical.path.ptr) { /*(skip for mod_fastcgi authorizer)*/
buffer_clear(&r->physical.doc_root);
buffer_clear(&r->physical.basedir);
buffer_clear(&r->physical.etag);
buffer_reset(&r->physical.path);
buffer_reset(&r->physical.rel_path);
}
r->resp_htags = 0;
r->resp_header_len = 0;
r->resp_header_repeated = 0;
array_reset_data_strings(&r->resp_headers);
http_response_body_clear(r, 0);
}
handler_t http_response_reqbody_read_error (request_st * const r, int http_status) {
r->keep_alive = 0;
/*(do not change status if response headers already set and possibly sent)*/
if (0 != r->resp_header_len) return HANDLER_ERROR;
http_response_body_clear(r, 0);
r->http_status = http_status;
r->handler_module = NULL;
return HANDLER_FINISHED;
}
static int http_response_coalesce_ranges (off_t * const ranges, int n)
{
/* coalesce/combine overlapping ranges and ranges separated by a
* gap which is smaller than the overhead of sending multiple parts
* (typically around 80 bytes) ([RFC7233] 4.1 206 Partial Content)
* (ranges are known to be positive, so subtract 80 instead of add 80
* to avoid any chance of integer overflow)
* (max n should be limited in caller since a malicious set of ranges has
* n^2 cost for the simplistic algorithm below)
* (sorting the ranges and then combining would lower the cost, but the
* cost should not be an issue since client should not send many ranges
* and caller should restrict the max number of ranges to limit abuse)
* [RFC7233] 4.1 206 Partial Content recommends:
* When a multipart response payload is generated, the server SHOULD send
* the parts in the same order that the corresponding byte-range-spec
* appeared in the received Range header field, excluding those ranges
* that were deemed unsatisfiable or that were coalesced into other ranges
*/
for (int i = 0; i+2 < n; i += 2) {
const off_t b = ranges[i];
const off_t e = ranges[i+1];
for (int j = i+2; j < n; j += 2) {
/* common case: ranges do not overlap */
if (b <= ranges[j] ? e < ranges[j]-80 : ranges[j+1] < b-80)
continue;
/* else ranges do overlap, so combine into first range */
ranges[i] = b <= ranges[j] ? b : ranges[j];
ranges[i+1] = e >= ranges[j+1] ? e : ranges[j+1];
memmove(ranges+j, ranges+j+2, (n-j-2)*sizeof(off_t));
/* restart outer loop from beginning */
n -= 2;
i = -2;
break;
}
}
return n;
}
static int http_response_parse_range(request_st * const r, stat_cache_entry * const sce, const char * const range) {
int n = 0;
int error;
off_t start, end;
const off_t st_size = sce->st.st_size;
const char *s, *minus;
static const char boundary[] = "fkj49sn38dcn3";
const buffer *content_type =
http_header_response_get(r, HTTP_HEADER_CONTENT_TYPE,
CONST_STR_LEN("Content-Type"));
off_t ranges[16];
start = 0;
end = st_size - 1;
for (s = range, error = 0;
!error && *s && NULL != (minus = strchr(s, '-')); ) {
char *err;
off_t la = 0, le;
*((const char **)&err) = s; /*(quiet clang --analyze)*/
if (s != minus) {
la = strtoll(s, &err, 10);
if (err != minus) {
/* should not have multiple range-unit in Range, but
* handle just in case multiple Range headers merged */
while (*s == ' ' || *s == '\t') ++s;
if (0 != strncmp(s, "bytes=", 6)) return -1;
s += 6;
if (s != minus) {
la = strtoll(s, &err, 10);
if (err != minus) return -1;
}
}
}
if (s == minus) {
/* -<stop> */
le = strtoll(s, &err, 10);
if (le == 0) {
/* RFC 2616 - 14.35.1 */
r->http_status = 416;
error = 1;
} else if (*err == '\0') {
/* end */
s = err;
end = st_size - 1;
start = st_size + le;
} else if (*err == ',') {
s = err + 1;
end = st_size - 1;
start = st_size + le;
} else {
error = 1;
}
} else if (*(minus+1) == '\0' || *(minus+1) == ',') {
/* <start>- */
/* ok */
if (*(err + 1) == '\0') {
s = err + 1;
end = st_size - 1;
start = la;
} else if (*(err + 1) == ',') {
s = err + 2;
end = st_size - 1;
start = la;
} else {
error = 1;
}
} else {
/* <start>-<stop> */
le = strtoll(minus+1, &err, 10);
/* RFC 2616 - 14.35.1 */
if (la > le) {
error = 1;
}
if (*err == '\0') {
/* ok, end*/
s = err;
end = le;
start = la;
} else if (*err == ',') {
s = err + 1;
end = le;
start = la;
} else {
/* error */
error = 1;
}
}
if (!error) {
if (start < 0) start = 0;
/* RFC 2616 - 14.35.1 */
if (end > st_size - 1) end = st_size - 1;
if (start > st_size - 1) {
error = 1;
r->http_status = 416;
}
}
if (!error) {
if (n < (int)(sizeof(ranges)/sizeof(*ranges))) {
ranges[n] = start;
ranges[n+1] = end;
n += 2;
}
else { /* excessive num ranges in request */
error = 1;
r->http_status = 416;
}
}
}
/* something went wrong */
if (error) return -1;
if (n > 2) n = http_response_coalesce_ranges(ranges, n);
for (int i = 0; i < n; i += 2) {
start = ranges[i];
end = ranges[i+1];
if (n > 2) {
/* write boundary-header */
buffer *b = r->tmp_buf;
buffer_copy_string_len(b, CONST_STR_LEN("\r\n--"));
buffer_append_string_len(b, boundary, sizeof(boundary)-1);
/* write Content-Range */
buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Range: bytes "));
buffer_append_int(b, start);
buffer_append_string_len(b, CONST_STR_LEN("-"));
buffer_append_int(b, end);
buffer_append_string_len(b, CONST_STR_LEN("/"));
buffer_append_int(b, st_size);
if (content_type) {
buffer_append_string_len(b, CONST_STR_LEN("\r\nContent-Type: "));
buffer_append_string_buffer(b, content_type);
}
/* write END-OF-HEADER */
buffer_append_string_len(b, CONST_STR_LEN("\r\n\r\n"));
http_chunk_append_mem(r, CONST_BUF_LEN(b));
}
http_chunk_append_file_ref_range(r, sce, start, end - start + 1);
}
buffer * const tb = r->tmp_buf;
if (n > 2) {
/* add boundary end */
buffer_copy_string_len(tb, "\r\n--", 4);
buffer_append_string_len(tb, boundary, sizeof(boundary)-1);
buffer_append_string_len(tb, "--\r\n", 4);
http_chunk_append_mem(r, CONST_BUF_LEN(tb));
/* set header-fields */
buffer_copy_string_len(tb, CONST_STR_LEN("multipart/byteranges; boundary="));
buffer_append_string_len(tb, boundary, sizeof(boundary)-1);
/* overwrite content-type */
http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE,
CONST_STR_LEN("Content-Type"),
CONST_BUF_LEN(tb));
} else {
/* add Content-Range-header */
buffer_copy_string_len(tb, CONST_STR_LEN("bytes "));
buffer_append_int(tb, start);
buffer_append_string_len(tb, CONST_STR_LEN("-"));
buffer_append_int(tb, end);
buffer_append_string_len(tb, CONST_STR_LEN("/"));
buffer_append_int(tb, st_size);
http_header_response_set(r, HTTP_HEADER_CONTENT_RANGE,
CONST_STR_LEN("Content-Range"),
CONST_BUF_LEN(tb));
}
/* ok, the file is set-up */
return 0;
}
__attribute_pure__
static int http_response_match_if_range(request_st * const r, const buffer * const mtime) {
const buffer *vb = http_header_request_get(r, HTTP_HEADER_IF_RANGE,
CONST_STR_LEN("If-Range"));
return NULL == vb
|| ((vb->ptr[0] == '"')
? buffer_is_equal(vb, &r->physical.etag) /*compare ETag ("...") */
: mtime && buffer_is_equal(vb, mtime)); /*compare Last-Modified*/
}
void http_response_send_file (request_st * const r, buffer * const path) {
stat_cache_entry * const sce = stat_cache_get_entry_open(path, r->conf.follow_symlink);
const buffer *mtime = NULL;
const buffer *vb;
int allow_caching = (0 == r->http_status || 200 == r->http_status);
if (NULL == sce) {
r->http_status = (errno == ENOENT) ? 404 : 403;
log_error(r->conf.errh, __FILE__, __LINE__,
"not a regular file: %s -> %s", r->uri.path.ptr, path->ptr);
return;
}
if (!r->conf.follow_symlink
&& 0 != stat_cache_path_contains_symlink(path, r->conf.errh)) {
r->http_status = 403;
if (r->conf.log_request_handling) {
log_error(r->conf.errh, __FILE__, __LINE__,
"-- access denied due symlink restriction");
log_error(r->conf.errh, __FILE__, __LINE__,
"Path : %s", path->ptr);
}
return;
}
/* we only handle regular files */
if (!S_ISREG(sce->st.st_mode)) {
r->http_status = 403;
if (r->conf.log_file_not_found) {
log_error(r->conf.errh, __FILE__, __LINE__,
"not a regular file: %s -> %s",
r->uri.path.ptr, path->ptr);
}
return;
}
if (sce->fd < 0 && 0 != sce->st.st_size) {
r->http_status = (errno == ENOENT) ? 404 : 403;
if (r->conf.log_request_handling) {
log_perror(r->conf.errh, __FILE__, __LINE__,
"file open failed: %s", path->ptr);
}
return;
}
/* set response content-type, if not set already */
if (!light_btst(r->resp_htags, HTTP_HEADER_CONTENT_TYPE)) {
const buffer *content_type = stat_cache_content_type_get(sce, r);
if (buffer_string_is_empty(content_type)) {
/* we are setting application/octet-stream, but also announce that
* this header field might change in the seconds few requests
*
* This should fix the aggressive caching of FF and the script download
* seen by the first installations
*/
http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE,
CONST_STR_LEN("Content-Type"),
CONST_STR_LEN("application/octet-stream"));
allow_caching = 0;
} else {
http_header_response_set(r, HTTP_HEADER_CONTENT_TYPE,
CONST_STR_LEN("Content-Type"),
CONST_BUF_LEN(content_type));
}
}
if (!http_method_get_or_head(r->http_method)
|| r->http_version < HTTP_VERSION_1_1)
r->conf.range_requests = 0;
if (r->conf.range_requests) {
http_header_response_append(r, HTTP_HEADER_ACCEPT_RANGES,
CONST_STR_LEN("Accept-Ranges"),
CONST_STR_LEN("bytes"));
}
if (allow_caching) {
if (!light_btst(r->resp_htags, HTTP_HEADER_ETAG)
&& 0 != r->conf.etag_flags) {
const buffer *etag =
stat_cache_etag_get(sce, r->conf.etag_flags);
if (!buffer_string_is_empty(etag)) {
buffer_copy_buffer(&r->physical.etag, etag);
http_header_response_set(r, HTTP_HEADER_ETAG,
CONST_STR_LEN("ETag"),
CONST_BUF_LEN(&r->physical.etag));
}
}
/* prepare header */
mtime = http_header_response_get(r, HTTP_HEADER_LAST_MODIFIED,
CONST_STR_LEN("Last-Modified"));
if (NULL == mtime) {
mtime = http_response_set_last_modified(r, sce->st.st_mtime);
}
if (HANDLER_FINISHED == http_response_handle_cachable(r, mtime, sce->st.st_mtime)) {
return;
}
}
if (0 == sce->st.st_size) {
r->http_status = 200;
r->resp_body_finished = 1;
/*(Transfer-Encoding should not have been set at this point)*/
http_header_response_set(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"),
CONST_STR_LEN("0"));
return;
}
if (r->conf.range_requests
&& (200 == r->http_status || 0 == r->http_status)
&& NULL != (vb = http_header_request_get(r, HTTP_HEADER_RANGE,
CONST_STR_LEN("Range")))
&& !light_btst(r->resp_htags, HTTP_HEADER_CONTENT_ENCODING)
&& http_response_match_if_range(r, mtime) /* "If-Range" */
&& !buffer_string_is_empty(vb) && 0 == strncmp(vb->ptr, "bytes=", 6)) {
r->resp_body_finished = 1;
if (0 == http_response_parse_range(r, sce, vb->ptr+6))
r->http_status = 206;
return;
}
/* if we are still here, prepare body */
/* we add it here for all requests
* the HEAD request will drop it afterwards again
*/
if (0 == http_chunk_append_file_ref(r, sce)) {
r->http_status = 200;
r->resp_body_finished = 1;
/*(Transfer-Encoding should not have been set at this point)*/
buffer * const tb = r->tmp_buf;
buffer_clear(tb);
buffer_append_int(tb, sce->st.st_size);
http_header_response_set(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"),
CONST_BUF_LEN(tb));
}
else {
r->http_status = 500;
}
}
static void http_response_xsendfile (request_st * const r, buffer * const path, const array * const xdocroot) {
const int status = r->http_status;
int valid = 1;
/* reset Content-Length, if set by backend
* Content-Length might later be set to size of X-Sendfile static file,
* determined by open(), fstat() to reduces race conditions if the file
* is modified between stat() (stat_cache_get_entry()) and open(). */
if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) {
http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"));
}
buffer_urldecode_path(path);
if (!buffer_is_valid_UTF8(path)) {
log_error(r->conf.errh, __FILE__, __LINE__,
"X-Sendfile invalid UTF-8 after url-decode: %s", path->ptr);
if (r->http_status < 400) {
r->http_status = 502;
r->handler_module = NULL;
}
return;
}
buffer_path_simplify(path, path);
if (r->conf.force_lowercase_filenames) {
buffer_to_lower(path);
}
/* check that path is under xdocroot(s)
* - xdocroot should have trailing slash appended at config time
* - r->conf.force_lowercase_filenames is not a server-wide setting,
* and so can not be definitively applied to xdocroot at config time*/
if (xdocroot) {
size_t i, xlen = buffer_string_length(path);
for (i = 0; i < xdocroot->used; ++i) {
data_string *ds = (data_string *)xdocroot->data[i];
size_t dlen = buffer_string_length(&ds->value);
if (dlen <= xlen
&& (!r->conf.force_lowercase_filenames
? 0 == memcmp(path->ptr, ds->value.ptr, dlen)
: buffer_eq_icase_ssn(path->ptr, ds->value.ptr, dlen))) {
break;
}
}
if (i == xdocroot->used && 0 != i) {
log_error(r->conf.errh, __FILE__, __LINE__,
"X-Sendfile (%s) not under configured x-sendfile-docroot(s)", path->ptr);
r->http_status = 403;
valid = 0;
}
}
if (valid) http_response_send_file(r, path);
if (r->http_status >= 400 && status < 300) {
r->handler_module = NULL;
} else if (0 != status && 200 != status) {
r->http_status = status;
}
}
static void http_response_xsendfile2(request_st * const r, const buffer * const value, const array * const xdocroot) {
const char *pos = value->ptr;
buffer * const b = r->tmp_buf;
const int status = r->http_status;
/* reset Content-Length, if set by backend */
if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) {
http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"));
}
while (*pos) {
const char *filename, *range;
stat_cache_entry *sce;
off_t begin_range, end_range, range_len;
while (' ' == *pos) pos++;
if (!*pos) break;
filename = pos;
if (NULL == (range = strchr(pos, ' '))) {
/* missing range */
log_error(r->conf.errh, __FILE__, __LINE__,
"Couldn't find range after filename: %s", filename);
r->http_status = 502;
break;
}
buffer_copy_string_len(b, filename, range - filename);
/* find end of range */
for (pos = ++range; *pos && *pos != ' ' && *pos != ','; pos++) ;
buffer_urldecode_path(b);
if (!buffer_is_valid_UTF8(b)) {
log_error(r->conf.errh, __FILE__, __LINE__,
"X-Sendfile2 invalid UTF-8 after url-decode: %s", b->ptr);
r->http_status = 502;
break;
}
buffer_path_simplify(b, b);
if (r->conf.force_lowercase_filenames) {
buffer_to_lower(b);
}
if (xdocroot) {
size_t i, xlen = buffer_string_length(b);
for (i = 0; i < xdocroot->used; ++i) {
data_string *ds = (data_string *)xdocroot->data[i];
size_t dlen = buffer_string_length(&ds->value);
if (dlen <= xlen
&& (!r->conf.force_lowercase_filenames
? 0 == memcmp(b->ptr, ds->value.ptr, dlen)
: buffer_eq_icase_ssn(b->ptr, ds->value.ptr, dlen))) {
break;
}
}
if (i == xdocroot->used && 0 != i) {
log_error(r->conf.errh, __FILE__, __LINE__,
"X-Sendfile2 (%s) not under configured x-sendfile-docroot(s)",
b->ptr);
r->http_status = 403;
break;
}
}
sce = stat_cache_get_entry_open(b, r->conf.follow_symlink);
if (NULL == sce) {
log_error(r->conf.errh, __FILE__, __LINE__,
"send-file error: couldn't get stat_cache entry for "
"X-Sendfile2: %s", b->ptr);
r->http_status = 404;
break;
} else if (!S_ISREG(sce->st.st_mode)) {
log_error(r->conf.errh, __FILE__, __LINE__,
"send-file error: wrong filetype for X-Sendfile2: %s", b->ptr);
r->http_status = 502;
break;
}
/* found the file */
/* parse range */
end_range = sce->st.st_size - 1;
{
char *rpos = NULL;
errno = 0;
begin_range = strtoll(range, &rpos, 10);
if (errno != 0 || begin_range < 0 || rpos == range)
goto range_failed;
if ('-' != *rpos++) goto range_failed;
if (rpos != pos) {
range = rpos;
end_range = strtoll(range, &rpos, 10);
if (errno != 0 || end_range < 0 || rpos == range)
goto range_failed;
}
if (rpos != pos) goto range_failed;
goto range_success;
range_failed:
log_error(r->conf.errh, __FILE__, __LINE__,
"Couldn't decode range after filename: %s", filename);
r->http_status = 502;
break;
range_success: ;
}
/* no parameters accepted */
while (*pos == ' ') pos++;
if (*pos != '\0' && *pos != ',') {
r->http_status = 502;
break;
}
range_len = end_range - begin_range + 1;
if (range_len < 0) {
r->http_status = 502;
break;
}
if (range_len != 0) {
http_chunk_append_file_ref_range(r, sce, begin_range, range_len);
}
if (*pos == ',') pos++;
}
if (r->http_status >= 400 && status < 300) {
r->handler_module = NULL;
} else if (0 != status && 200 != status) {
r->http_status = status;
}
}
void http_response_backend_error (request_st * const r) {
if (r->resp_body_started) {
/*(response might have been already started, kill the connection)*/
/*(mode == DIRECT to avoid later call to http_response_backend_done())*/
r->handler_module = NULL; /*(avoid sending final chunked block)*/
r->keep_alive = 0;
r->resp_body_finished = 1;
} /*(else error status set later by http_response_backend_done())*/
}
void http_response_backend_done (request_st * const r) {
/* (not CON_STATE_ERROR and not CON_STATE_RESPONSE_END,
* i.e. not called from handle_connection_close or handle_request_reset
* hooks, except maybe from errdoc handler, which later resets state)*/
switch (r->state) {
case CON_STATE_HANDLE_REQUEST:
case CON_STATE_READ_POST:
if (!r->resp_body_started) {
/* Send an error if we haven't sent any data yet */
r->http_status = 500;
r->handler_module = NULL;
break;
}
__attribute_fallthrough__
case CON_STATE_WRITE:
if (!r->resp_body_finished) {
if (r->http_version == HTTP_VERSION_1_1)
http_chunk_close(r);
r->resp_body_finished = 1;
}
default:
break;
}
}
void http_response_upgrade_read_body_unknown(request_st * const r) {
/* act as transparent proxy */
if (!(r->conf.stream_request_body & FDEVENT_STREAM_REQUEST))
r->conf.stream_request_body |=
(FDEVENT_STREAM_REQUEST_BUFMIN | FDEVENT_STREAM_REQUEST);
if (!(r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE))
r->conf.stream_response_body |=
(FDEVENT_STREAM_RESPONSE_BUFMIN | FDEVENT_STREAM_RESPONSE);
r->conf.stream_request_body |= FDEVENT_STREAM_REQUEST_POLLIN;
r->reqbody_length = -2;
r->keep_alive = 0;
}
static handler_t http_response_process_local_redir(request_st * const r, size_t blen) {
/* [RFC3875] The Common Gateway Interface (CGI) Version 1.1
* [RFC3875] 6.2.2 Local Redirect Response
*
* The CGI script can return a URI path and query-string
* ('local-pathquery') for a local resource in a Location header field.
* This indicates to the server that it should reprocess the request
* using the path specified.
*
* local-redir-response = local-Location NL
*
* The script MUST NOT return any other header fields or a message-body,
* and the server MUST generate the response that it would have produced
* in response to a request containing the URL
*
* scheme "://" server-name ":" server-port local-pathquery
*
* (Might not have begun to receive body yet, but do skip local-redir
* if we already have started receiving a response body (blen > 0))
* (Also, while not required by the RFC, do not send local-redir back
* to same URL, since CGI should have handled it internally if it
* really wanted to do that internally)
*/
/* r->http_status >= 300 && r->http_status < 400) */
size_t ulen = buffer_string_length(&r->uri.path);
const buffer *vb = http_header_response_get(r, HTTP_HEADER_LOCATION,
CONST_STR_LEN("Location"));
if (NULL != vb
&& vb->ptr[0] == '/'
&& (0 != strncmp(vb->ptr, r->uri.path.ptr, ulen)
|| ( vb->ptr[ulen] != '\0'
&& vb->ptr[ulen] != '/'
&& vb->ptr[ulen] != '?'))
&& 0 == blen /*no "Status" or NPH response*/
&& !light_btst(r->resp_htags, HTTP_HEADER_STATUS)
&& 1 == r->resp_headers.used) {
if (++r->loops_per_request > 5) {
log_error(r->conf.errh, __FILE__, __LINE__,
"too many internal loops while processing request: %s",
r->target_orig.ptr);
r->http_status = 500; /* Internal Server Error */
r->handler_module = NULL;
return HANDLER_FINISHED;
}
buffer_copy_buffer(&r->target, vb);
if (r->reqbody_length) {
if (r->reqbody_length != r->reqbody_queue.bytes_in)
r->keep_alive = 0;
r->reqbody_length = 0;
chunkqueue_reset(&r->reqbody_queue);
}
if (r->http_status != 307 && r->http_status != 308) {
/* Note: request body (if any) sent to initial dynamic handler
* and is not available to the internal redirect */
r->http_method = HTTP_METHOD_GET;
}
/*(caller must reset request as follows)*/
/*http_response_reset(r);*/ /*(sets r->http_status = 0)*/
/*plugins_call_handle_request_reset(r);*/
return HANDLER_COMEBACK;
}
return HANDLER_GO_ON;
}
static int http_response_process_headers(request_st * const r, http_response_opts * const opts, buffer * const hdrs) {
char *ns;
const char *s;
int line = 0;
int status_is_set = 0;
for (s = hdrs->ptr; NULL != (ns = strchr(s, '\n')); s = ns + 1, ++line) {
const char *key, *value;
int key_len;
enum http_header_e id;
/* strip the \n */
ns[0] = '\0';
if (ns > s && ns[-1] == '\r') ns[-1] = '\0';
if (0 == line && (ns - s) >= 12 && 0 == memcmp(s, "HTTP/", 5)) {
/* non-parsed headers ... we parse them anyway */
/* (accept HTTP/2.0 and HTTP/3.0 from naive non-proxy backends) */
if ((s[5] == '1' || opts->backend != BACKEND_PROXY) && s[6] == '.'
&& (s[7] == '1' || s[7] == '0') && s[8] == ' ') {
/* after the space should be a status code for us */
int status = http_header_str_to_code(s+9);
if (status >= 100 && status < 1000) {
status_is_set = 1;
light_bset(r->resp_htags, HTTP_HEADER_STATUS);
r->http_status = status;
} /* else we expected 3 digits and didn't get them */
}
if (0 == r->http_status) {
log_error(r->conf.errh, __FILE__, __LINE__,
"invalid HTTP status line: %s", s);
r->http_status = 502; /* Bad Gateway */
r->handler_module = NULL;
return -1;
}
continue;
}
/* parse the headers */
key = s;
if (NULL == (value = strchr(s, ':'))) {
/* we expect: "<key>: <value>\r\n" */
continue;
}
key_len = value - key;
if (0 == key_len) continue; /*(already ignored when writing response)*/
do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */
id = http_header_hkey_get(key, key_len);
if (opts->authorizer) {
if (0 == r->http_status || 200 == r->http_status) {
if (id == HTTP_HEADER_STATUS) {
int status = http_header_str_to_code(value);
if (status >= 100 && status < 1000) {
r->http_status = status;
} else {
r->http_status = 502; /* Bad Gateway */
break;
}
}
else if (id == HTTP_HEADER_OTHER && key_len > 9
&& (key[0] & 0xdf) == 'V'
&& buffer_eq_icase_ssn(key,
CONST_STR_LEN("Variable-"))) {
http_header_env_append(r, key + 9, key_len - 9, value, strlen(value));
}
continue;
}
}
switch (id) {
case HTTP_HEADER_STATUS:
{
if (opts->backend == BACKEND_PROXY) break; /*(pass w/o parse)*/
int status = http_header_str_to_code(value);
if (status >= 100 && status < 1000) {
r->http_status = status;
status_is_set = 1;
} else {
r->http_status = 502;
r->handler_module = NULL;
}
continue; /* do not send Status to client */
}
break;
case HTTP_HEADER_UPGRADE:
/*(technically, should also verify Connection: upgrade)*/
/*(flag only for mod_proxy and mod_cgi (for now))*/
if (opts->backend != BACKEND_PROXY && opts->backend != BACKEND_CGI)
continue;
if (r->http_version >= HTTP_VERSION_2) continue;
break;
case HTTP_HEADER_CONNECTION:
if (opts->backend == BACKEND_PROXY) continue;
/*(should parse for tokens and do case-insensitive match for "close"
* but this is an imperfect though simplistic attempt to honor
* backend request to close)*/
if (NULL != strstr(value, "lose")) r->keep_alive = 0;
if (r->http_version >= HTTP_VERSION_2) continue;
break;
case HTTP_HEADER_CONTENT_LENGTH:
if (*value == '+') ++value;
if (!r->resp_decode_chunked
&& !light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) {
const char *err = ns;
if (err[-1] == '\0') --err; /*(skip one '\0', trailing whitespace)*/
while (err > value && (err[-1] == ' ' || err[-1] == '\t')) --err;
if (err <= value) continue; /*(might error 502 Bad Gateway)*/
uint32_t vlen = (uint32_t)(err - value);
r->resp_body_scratchpad =
(off_t)li_restricted_strtoint64(value, vlen, &err);
if (err != value + vlen) {
/*(invalid Content-Length value from backend;
* read from backend until backend close, hope for the best)
*(might choose to treat this as 502 Bad Gateway) */
r->resp_body_scratchpad = -1;
}
}
else {
/* ignore Content-Length if Transfer-Encoding: chunked
* ignore subsequent (multiple) Content-Length
* (might choose to treat this as 502 Bad Gateway) */
continue;
}
break;
case HTTP_HEADER_TRANSFER_ENCODING:
if (light_btst(r->resp_htags, HTTP_HEADER_CONTENT_LENGTH)) {
/* ignore Content-Length if Transfer-Encoding: chunked
* (might choose to treat this as 502 Bad Gateway) */
r->resp_body_scratchpad = -1;
http_header_response_unset(r, HTTP_HEADER_CONTENT_LENGTH,
CONST_STR_LEN("Content-Length"));
}
/*(assumes "Transfer-Encoding: chunked"; does not verify)*/
r->resp_decode_chunked = 1;
r->gw_dechunk = calloc(1, sizeof(response_dechunk));
/* XXX: future: might consider using chunk_buffer_acquire()
* and chunk_buffer_release() for r->gw_dechunk->b */
force_assert(r->gw_dechunk);
continue;
case HTTP_HEADER_HTTP2_SETTINGS:
/* RFC7540 3.2.1
* A server MUST NOT send this header field. */
/* (not bothering to remove HTTP2-Settings from Connection) */
continue;
default:
break;
}
http_header_response_insert(r, id, key, key_len, value, strlen(value));
}
/* CGI/1.1 rev 03 - 7.2.1.2 */
/* (proxy requires Status-Line, so never true for proxy)*/
if (!status_is_set && light_btst(r->resp_htags, HTTP_HEADER_LOCATION)) {
r->http_status = 302;
}
return 0;
}
static http_response_send_1xx_cb http_response_send_1xx_h1;
static http_response_send_1xx_cb http_response_send_1xx_h2;
void
http_response_send_1xx_cb_set (http_response_send_1xx_cb fn, int vers)
{
if (vers >= HTTP_VERSION_2)
http_response_send_1xx_h2 = fn;
else if (vers == HTTP_VERSION_1_1)
http_response_send_1xx_h1 = fn;
}
int
http_response_send_1xx (request_st * const r)
{
http_response_send_1xx_cb http_response_send_1xx_fn = NULL;
if (r->http_version >= HTTP_VERSION_2)
http_response_send_1xx_fn = http_response_send_1xx_h2;
else if (r->http_version == HTTP_VERSION_1_1)
http_response_send_1xx_fn = http_response_send_1xx_h1;
if (http_response_send_1xx_fn && !http_response_send_1xx_fn(r, r->con))
return 0; /* error occurred */
http_response_header_clear(r);
return 1; /* 1xx response handled */
}
__attribute_cold__
__attribute_noinline__
static int
http_response_check_1xx (request_st * const r, buffer * const restrict b, uint32_t hlen, uint32_t dlen)
{
/* pass through unset r->http_status (not 1xx) or 101 Switching Protocols */
if (0 == r->http_status || 101 == r->http_status)
return 0; /* pass through as-is; do not loop for addtl response hdrs */
/* discard 1xx response from b; already processed
* (but further response might follow in b, so preserve addtl data) */
if (dlen)
memmove(b->ptr, b->ptr+hlen, dlen);
buffer_string_set_length(b, dlen);
/* Note: while GW_AUTHORIZER mode is not expected to return 1xx, as a
* feature, 1xx responses from authorizer are passed back to client */
return http_response_send_1xx(r);
/* 0: error, 1: 1xx response handled; loop for next response headers */
}
__attribute_hot__
__attribute_pure__
static const char *
http_response_end_of_header (const char * const restrict ptr)
{
/* find \n(\r)?\n sequence */
for (const char *n=ptr-1, *nn=NULL; NULL != (n = strchr(n+1, '\n')); nn=n) {
if (n - nn == 2 ? n[-1] == '\r' : n - nn == 1) return n+1;
}
return NULL;
}
handler_t http_response_parse_headers(request_st * const r, http_response_opts * const opts, buffer * const b) {
/**
* possible formats of response headers:
*
* proxy or NPH (non-parsed headers):
*
* 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 separator
*/
const char *bstart;
uint32_t blen;
do {
blen = buffer_string_length(b);
/*("HTTP/1.1 200 " is at least 13 chars + \r\n, but accept w/o final ' ')*/
const int is_nph = (blen >= 12 && 0 == memcmp(b->ptr, "HTTP/", 5));
int is_header_end = 0;
uint32_t i = 0;
if (b->ptr[0] == '\n' || (b->ptr[0] == '\r' && b->ptr[1] == '\n')) {
/* no HTTP headers */
i = (b->ptr[0] == '\n') ? 0 : 1;
is_header_end = 1;
} else if (is_nph || b->ptr[(i = strcspn(b->ptr, ":\n"))] == ':') {
/* HTTP headers */
const char *n = http_response_end_of_header(b->ptr+i+1);
if (n) {
i = (uint32_t)(n - b->ptr - 1);
is_header_end = 1;
}
} else if (i == blen) { /* (no newline yet; partial header line?) */
} else if (opts->backend == BACKEND_CGI) {
/* no HTTP headers, but a body (special-case for CGI compat) */
/* no colon found; does not appear to be HTTP headers */
if (0 != http_chunk_append_buffer(r, b)) {
return HANDLER_ERROR;
}
r->http_status = 200; /* OK */
r->resp_body_started = 1;
return HANDLER_GO_ON;
} else {
/* invalid response headers */
r->http_status = 502; /* Bad Gateway */
r->handler_module = NULL;
return HANDLER_FINISHED;
}
if (!is_header_end) {
if (blen > MAX_HTTP_RESPONSE_FIELD_SIZE) {
log_error(r->conf.errh, __FILE__, __LINE__,
"response headers too large for %s", r->uri.path.ptr);
r->http_status = 502; /* Bad Gateway */
r->handler_module = NULL;
return HANDLER_FINISHED;
}
return HANDLER_GO_ON;
}
/* the body starts after the EOL */
bstart = b->ptr + (i + 1);
blen -= (i + 1);
/* strip the last \r?\n */
if (i > 0 && (b->ptr[i - 1] == '\r')) {
i--;
}
buffer_string_set_length(b, i);
if (opts->backend == BACKEND_PROXY && !is_nph) {
/* invalid response Status-Line from HTTP proxy */
r->http_status = 502; /* Bad Gateway */
r->handler_module = NULL;
return HANDLER_FINISHED;
}
if (0 != http_response_process_headers(r, opts, b)) {
return HANDLER_ERROR;
}
} while (r->http_status < 200
&& http_response_check_1xx(r, b, bstart - b->ptr, blen));
r->resp_body_started = 1;
if (opts->authorizer
&& (r->http_status == 0 || r->http_status == 200)) {
return HANDLER_GO_ON;
}
if (NULL == r->handler_module) {
return HANDLER_FINISHED;
}
if (opts->local_redir && r->http_status >= 300 && r->http_status < 400){
/*(light_btst(r->resp_htags, HTTP_HEADER_LOCATION))*/
handler_t rc = http_response_process_local_redir(r, blen);
if (NULL == r->handler_module)
r->resp_body_started = 0;
if (rc != HANDLER_GO_ON) return rc;
}
if (opts->xsendfile_allow) {
buffer *vb;
/* X-Sendfile2 is deprecated; historical for fastcgi */
if (opts->backend == BACKEND_FASTCGI
&& NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER,
CONST_STR_LEN("X-Sendfile2")))) {
http_response_xsendfile2(r, vb, opts->xsendfile_docroot);
/* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */
buffer_clear(vb); /*(do not send to client)*/
if (NULL == r->handler_module)
r->resp_body_started = 0;
return HANDLER_FINISHED;
} else if (NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER,
CONST_STR_LEN("X-Sendfile")))
|| (opts->backend == BACKEND_FASTCGI /* X-LIGHTTPD-send-file is deprecated; historical for fastcgi */
&& NULL != (vb = http_header_response_get(r, HTTP_HEADER_OTHER,
CONST_STR_LEN("X-LIGHTTPD-send-file"))))) {
http_response_xsendfile(r, vb, opts->xsendfile_docroot);
/* http_header_response_unset() shortcut for HTTP_HEADER_OTHER */
buffer_clear(vb); /*(do not send to client)*/
if (NULL == r->handler_module)
r->resp_body_started = 0;
return HANDLER_FINISHED;
}
}
if (blen > 0) {
if (0 != http_chunk_decode_append_mem(r, bstart, blen))
return HANDLER_ERROR;
}
/* (callback for response headers complete) */
return (opts->headers) ? opts->headers(r, opts) : HANDLER_GO_ON;
}
handler_t http_response_read(request_st * const r, http_response_opts * const opts, buffer * const b, fdnode * const fdn) {
const int fd = fdn->fd;
while (1) {
ssize_t n;
size_t avail = buffer_string_space(b);
unsigned int toread = 0;
if (0 == fdevent_ioctl_fionread(fd, opts->fdfmt, (int *)&toread)) {
if (avail < toread) {
size_t blen = buffer_string_length(b);
if (toread + blen < 4096)
toread = 4095 - blen;
else if (toread > MAX_READ_LIMIT)
toread = MAX_READ_LIMIT;
}
else if (0 == toread) {
#if 0
return (fdevent_fdnode_interest(fdn) & FDEVENT_IN)
? HANDLER_FINISHED /* read finished */
: HANDLER_GO_ON; /* optimistic read; data not ready */
#else
if (!(fdevent_fdnode_interest(fdn) & FDEVENT_IN)) {
if (!(r->conf.stream_response_body
& FDEVENT_STREAM_RESPONSE_POLLRDHUP))
return HANDLER_GO_ON;/*optimistic read; data not ready*/
}
if (0 == avail) /* let read() below indicate if EOF or EAGAIN */
toread = 1024;
#endif
}
}
else if (avail < 1024) {
toread = 4095 - avail;
}
if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) {
off_t cqlen = chunkqueue_length(&r->write_queue);
if (cqlen + (off_t)toread > 65536 - 4096) {
if (!r->con->is_writable) {
/*(defer removal of FDEVENT_IN interest since
* connection_state_machine() might be able to send data
* immediately, unless !con->is_writable, where
* connection_state_machine() might not loop back to call
* mod_proxy_handle_subrequest())*/
fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN);
}
if (cqlen >= 65536-1) return HANDLER_GO_ON;
toread = 65536 - 1 - (unsigned int)cqlen;
/* Note: heuristic is fuzzy in that it limits how much to read
* from backend based on how much is pending to write to client.
* Modules where data from backend is framed (e.g. FastCGI) may
* want to limit how much is buffered from backend while waiting
* for a complete data frame or data packet from backend. */
}
}
if (avail < toread) {
/*(add avail+toread to reduce allocations when ioctl EOPNOTSUPP)*/
avail = avail ? avail - 1 + toread : toread;
avail = chunk_buffer_prepare_append(b, avail);
}
n = read(fd, b->ptr+buffer_string_length(b), avail);
if (n < 0) {
switch (errno) {
case EAGAIN:
#ifdef EWOULDBLOCK
#if EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
#endif
case EINTR:
return HANDLER_GO_ON;
default:
log_perror(r->conf.errh, __FILE__, __LINE__,
"read() %d %d", r->con->fd, fd);
return HANDLER_ERROR;
}
}
buffer_commit(b, (size_t)n);
#ifdef __COVERITY__
/* Coverity Scan overlooks the effect of buffer_commit() */
b->ptr[buffer_string_length(b)+n] = '\0';
#endif
if (NULL != opts->parse) {
handler_t rc = opts->parse(r, opts, b, (size_t)n);
if (rc != HANDLER_GO_ON) return rc;
} else if (0 == n) {
/* note: no further data is sent to backend after read EOF on socket
* (not checking for half-closed TCP socket)
* (backend should read all data desired prior to closing socket,
* though might send app-level close data frame, if applicable) */
return HANDLER_FINISHED; /* read finished */
} else if (0 == r->resp_body_started) {
/* split header from body */
handler_t rc = http_response_parse_headers(r, opts, b);
if (rc != HANDLER_GO_ON) return rc;
/* accumulate response in b until headers completed (or error) */
if (r->resp_body_started) buffer_clear(b);
} else {
if (0 != http_chunk_decode_append_buffer(r, b)) {
/* error writing to tempfile;
* truncate response or send 500 if nothing sent yet */
return HANDLER_ERROR;
}
buffer_clear(b);
}
if (r->conf.stream_response_body & FDEVENT_STREAM_RESPONSE_BUFMIN) {
if (chunkqueue_length(&r->write_queue) > 65536 - 4096) {
/*(defer removal of FDEVENT_IN interest since
* connection_state_machine() might be able to send
* data immediately, unless !con->is_writable, where
* connection_state_machine() might not loop back to
* call the subrequest handler)*/
if (!r->con->is_writable)
fdevent_fdnode_event_clr(r->con->srv->ev, fdn, FDEVENT_IN);
break;
}
}
if ((size_t)n < avail)
break; /* emptied kernel read buffer or partial read */
}
return HANDLER_GO_ON;
}
int http_cgi_headers (request_st * const r, http_cgi_opts * const opts, http_cgi_header_append_cb cb, void *vdata) {
/* CGI-SPEC 6.1.2, FastCGI spec 6.3 and SCGI spec */
int rc = 0;
const connection * const con = r->con;
server_socket * const srv_sock = con->srv_socket;
buffer * const tb = r->tmp_buf;
const char *s;
size_t n;
char buf[LI_ITOSTRING_LENGTH];
sock_addr *addr;
sock_addr addrbuf;
char b2[INET6_ADDRSTRLEN + 1];
/* (CONTENT_LENGTH must be first for SCGI) */
if (!opts->authorizer) {
rc |= cb(vdata, CONST_STR_LEN("CONTENT_LENGTH"),
buf, li_itostrn(buf,sizeof(buf),r->reqbody_length));
}
if (!buffer_string_is_empty(&r->uri.query)) {
rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"),
CONST_BUF_LEN(&r->uri.query));
} else {
rc |= cb(vdata, CONST_STR_LEN("QUERY_STRING"),
CONST_STR_LEN(""));
}
if (!buffer_string_is_empty(opts->strip_request_uri)) {
/**
* /app1/index/list
*
* stripping /app1 or /app1/ should lead to
*
* /index/list
*
*/
size_t len = buffer_string_length(opts->strip_request_uri);
if ('/' == opts->strip_request_uri->ptr[len-1]) {
--len;
}
if (buffer_string_length(&r->target_orig) >= len
&& 0 == memcmp(r->target_orig.ptr,
opts->strip_request_uri->ptr, len)
&& r->target_orig.ptr[len] == '/') {
rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"),
r->target_orig.ptr+len,
buffer_string_length(&r->target_orig)-len);
} else {
rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"),
CONST_BUF_LEN(&r->target_orig));
}
} else {
rc |= cb(vdata, CONST_STR_LEN("REQUEST_URI"),
CONST_BUF_LEN(&r->target_orig));
}
if (!buffer_is_equal(&r->target, &r->target_orig)) {
rc |= cb(vdata, CONST_STR_LEN("REDIRECT_URI"),
CONST_BUF_LEN(&r->target));
}
/* set REDIRECT_STATUS for php compiled with --force-redirect
* (if REDIRECT_STATUS has not already been set by error handler) */
if (0 == r->error_handler_saved_status) {
rc |= cb(vdata, CONST_STR_LEN("REDIRECT_STATUS"),
CONST_STR_LEN("200"));
}
/*
* SCRIPT_NAME, PATH_INFO and PATH_TRANSLATED according to
* http://cgi-spec.golux.com/draft-coar-cgi-v11-03-clean.html
* (6.1.14, 6.1.6, 6.1.7)
*/
if (!opts->authorizer) {
rc |= cb(vdata, CONST_STR_LEN("SCRIPT_NAME"),
CONST_BUF_LEN(&r->uri.path));
if (!buffer_string_is_empty(&r->pathinfo)) {
rc |= cb(vdata, CONST_STR_LEN("PATH_INFO"),
CONST_BUF_LEN(&r->pathinfo));
/* PATH_TRANSLATED is only defined if PATH_INFO is set */
if (!buffer_string_is_empty(opts->docroot)) {
buffer_copy_buffer(tb, opts->docroot);
} else {
buffer_copy_buffer(tb, &r->physical.basedir);
}
buffer_append_path_len(tb, CONST_BUF_LEN(&r->pathinfo));
rc |= cb(vdata, CONST_STR_LEN("PATH_TRANSLATED"),
CONST_BUF_LEN(tb));
}
}
/*
* SCRIPT_FILENAME and DOCUMENT_ROOT for php
* The PHP manual http://www.php.net/manual/en/reserved.variables.php
* treatment of PATH_TRANSLATED is different from the one of CGI specs.
* (see php.ini cgi.fix_pathinfo = 1 config parameter)
*/
if (!buffer_string_is_empty(opts->docroot)) {
/* alternate docroot, e.g. for remote FastCGI or SCGI server */
buffer_copy_buffer(tb, opts->docroot);
buffer_append_path_len(tb, CONST_BUF_LEN(&r->uri.path));
rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"),
CONST_BUF_LEN(tb));
rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"),
CONST_BUF_LEN(opts->docroot));
} else {
if (opts->break_scriptfilename_for_php) {
/* php.ini config cgi.fix_pathinfo = 1 need a broken SCRIPT_FILENAME
* to find out what PATH_INFO is itself
*
* see src/sapi/cgi_main.c, init_request_info()
*/
buffer_copy_buffer(tb, &r->physical.path);
buffer_append_path_len(tb, CONST_BUF_LEN(&r->pathinfo));
rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"),
CONST_BUF_LEN(tb));
} else {
rc |= cb(vdata, CONST_STR_LEN("SCRIPT_FILENAME"),
CONST_BUF_LEN(&r->physical.path));
}
rc |= cb(vdata, CONST_STR_LEN("DOCUMENT_ROOT"),
CONST_BUF_LEN(&r->physical.basedir));
}
s = get_http_method_name(r->http_method);
force_assert(s);
rc |= cb(vdata, CONST_STR_LEN("REQUEST_METHOD"), s, strlen(s));
s = get_http_version_name(r->http_version);
force_assert(s);
rc |= cb(vdata, CONST_STR_LEN("SERVER_PROTOCOL"), s, strlen(s));
rc |= cb(vdata, CONST_STR_LEN("SERVER_SOFTWARE"),
CONST_BUF_LEN(r->conf.server_tag));
rc |= cb(vdata, CONST_STR_LEN("GATEWAY_INTERFACE"),
CONST_STR_LEN("CGI/1.1"));
rc |= cb(vdata, CONST_STR_LEN("REQUEST_SCHEME"),
CONST_BUF_LEN(&r->uri.scheme));
if (buffer_is_equal_string(&r->uri.scheme, CONST_STR_LEN("https"))) {
rc |= cb(vdata, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on"));
}
addr = &srv_sock->addr;
rc |= cb(vdata, CONST_STR_LEN("SERVER_PORT"),
buf, li_utostrn(buf,sizeof(buf),sock_addr_get_port(addr)));
switch (sock_addr_get_family(addr)) {
case AF_INET:
case AF_INET6:
if (sock_addr_is_addr_wildcard(addr)) {
socklen_t addrlen = sizeof(addrbuf);
if (0 == getsockname(con->fd,(struct sockaddr *)&addrbuf,&addrlen)){
addr = &addrbuf;
} else {
s = "";
break;
}
}
s = sock_addr_inet_ntop(addr, b2, sizeof(b2)-1);
if (NULL == s) s = "";
break;
default:
s = "";
break;
}
force_assert(s);
rc |= cb(vdata, CONST_STR_LEN("SERVER_ADDR"), s, strlen(s));
if (!buffer_string_is_empty(r->server_name)) {
size_t len = buffer_string_length(r->server_name);
if (r->server_name->ptr[0] == '[') {
const char *colon = strstr(r->server_name->ptr, "]:");
if (colon) len = (colon + 1) - r->server_name->ptr;
} else {
const char *colon = strchr(r->server_name->ptr, ':');
if (colon) len = colon - r->server_name->ptr;
}
rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"),
r->server_name->ptr, len);
} else {
/* set to be same as SERVER_ADDR (above) */
rc |= cb(vdata, CONST_STR_LEN("SERVER_NAME"), s, strlen(s));
}
rc |= cb(vdata, CONST_STR_LEN("REMOTE_ADDR"),
CONST_BUF_LEN(con->dst_addr_buf));
rc |= cb(vdata, CONST_STR_LEN("REMOTE_PORT"), buf,
li_utostrn(buf,sizeof(buf),sock_addr_get_port(&con->dst_addr)));
for (n = 0; n < r->rqst_headers.used; n++) {
data_string *ds = (data_string *)r->rqst_headers.data[n];
if (!buffer_string_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) {
/* Security: Do not emit HTTP_PROXY in environment.
* Some executables use HTTP_PROXY to configure
* outgoing proxy. See also https://httpoxy.org/ */
if (buffer_is_equal_caseless_string(&ds->key,
CONST_STR_LEN("Proxy"))) {
continue;
}
buffer_copy_string_encoded_cgi_varnames(tb,
CONST_BUF_LEN(&ds->key), 1);
rc |= cb(vdata, CONST_BUF_LEN(tb),
CONST_BUF_LEN(&ds->value));
}
}
con->srv->request_env(r);
for (n = 0; n < r->env.used; n++) {
data_string *ds = (data_string *)r->env.data[n];
if (!buffer_is_empty(&ds->value) && !buffer_is_empty(&ds->key)) {
buffer_copy_string_encoded_cgi_varnames(tb,
CONST_BUF_LEN(&ds->key), 0);
rc |= cb(vdata, CONST_BUF_LEN(tb),
CONST_BUF_LEN(&ds->value));
}
}
return rc;
}