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lighttpd1.4/src/request.c

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#include <sys/stat.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "request.h"
#include "keyvalue.h"
#include "log.h"
static int request_check_hostname(server *srv, connection *con, buffer *host) {
enum { DOMAINLABEL, TOPLABEL } stage = TOPLABEL;
size_t i;
int label_len = 0;
size_t host_len;
char *colon;
int is_ip = -1; /* -1 don't know yet, 0 no, 1 yes */
int level = 0;
UNUSED(srv);
UNUSED(con);
/*
* hostport = host [ ":" port ]
* host = hostname | IPv4address | IPv6address
* hostname = *( domainlabel "." ) toplabel [ "." ]
* domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
* toplabel = alpha | alpha *( alphanum | "-" ) alphanum
* IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
* IPv6address = "[" ... "]"
* port = *digit
*/
/* no Host: */
if (!host || host->used == 0) return 0;
host_len = host->used - 1;
/* IPv6 adress */
if (host->ptr[0] == '[') {
char *c = host->ptr + 1;
int colon_cnt = 0;
/* check portnumber */
for (; *c && *c != ']'; c++) {
if (*c == ':') {
if (++colon_cnt > 7) {
return -1;
}
} else if (!light_isxdigit(*c)) {
return -1;
}
}
/* missing ] */
if (!*c) {
return -1;
}
/* check port */
if (*(c+1) == ':') {
for (c += 2; *c; c++) {
if (!light_isdigit(*c)) {
return -1;
}
}
}
return 0;
}
if (NULL != (colon = memchr(host->ptr, ':', host_len))) {
char *c = colon + 1;
/* check portnumber */
for (; *c; c++) {
if (!light_isdigit(*c)) return -1;
}
/* remove the port from the host-len */
host_len = colon - host->ptr;
}
/* Host is empty */
if (host_len == 0) return -1;
/* scan from the right and skip the \0 */
for (i = host_len - 1; i + 1 > 0; i--) {
char c = host->ptr[i];
switch (stage) {
case TOPLABEL:
if (c == '.') {
/* only switch stage, if this is not the last character */
if (i != host_len - 1) {
if (label_len == 0) {
return -1;
}
/* check the first character at right of the dot */
if (is_ip == 0) {
if (!light_isalpha(host->ptr[i+1])) {
return -1;
}
} else if (!light_isdigit(host->ptr[i+1])) {
is_ip = 0;
} else if ('-' == host->ptr[i+1]) {
return -1;
} else {
/* just digits */
is_ip = 1;
}
stage = DOMAINLABEL;
label_len = 0;
level++;
} else if (i == 0) {
/* just a dot and nothing else is evil */
return -1;
}
} else if (i == 0) {
/* the first character of the hostname */
if (!light_isalpha(c)) {
return -1;
}
label_len++;
} else {
if (c != '-' && !light_isalnum(c)) {
return -1;
}
if (is_ip == -1) {
if (!light_isdigit(c)) is_ip = 0;
}
label_len++;
}
break;
case DOMAINLABEL:
if (is_ip == 1) {
if (c == '.') {
if (label_len == 0) {
return -1;
}
label_len = 0;
level++;
} else if (!light_isdigit(c)) {
return -1;
} else {
label_len++;
}
} else {
if (c == '.') {
if (label_len == 0) {
return -1;
}
/* c is either - or alphanum here */
if ('-' == host->ptr[i+1]) {
return -1;
}
label_len = 0;
level++;
} else if (i == 0) {
if (!light_isalnum(c)) {
return -1;
}
label_len++;
} else {
if (c != '-' && !light_isalnum(c)) {
return -1;
}
label_len++;
}
}
break;
}
}
/* a IP has to consist of 4 parts */
if (is_ip == 1 && level != 3) {
return -1;
}
if (label_len == 0) {
return -1;
}
return 0;
}
#if 0
#define DUMP_HEADER
#endif
int http_request_split_value(array *vals, buffer *b) {
char *s;
size_t i;
int state = 0;
/*
* parse
*
* val1, val2, val3, val4
*
* into a array (more or less a explode() incl. striping of whitespaces
*/
if (b->used == 0) return 0;
s = b->ptr;
for (i =0; i < b->used - 1; ) {
char *start = NULL, *end = NULL;
data_string *ds;
switch (state) {
case 0: /* ws */
/* skip ws */
for (; (*s == ' ' || *s == '\t') && i < b->used - 1; i++, s++);
state = 1;
break;
case 1: /* value */
start = s;
for (; *s != ',' && i < b->used - 1; i++, s++);
end = s - 1;
for (; (*end == ' ' || *end == '\t') && end > start; end--);
if (NULL == (ds = (data_string *)array_get_unused_element(vals, TYPE_STRING))) {
ds = data_string_init();
}
buffer_copy_string_len(ds->value, start, end-start+1);
array_insert_unique(vals, (data_unset *)ds);
if (*s == ',') {
state = 0;
i++;
s++;
} else {
/* end of string */
state = 2;
}
break;
default:
i++;
break;
}
}
return 0;
}
int request_uri_is_valid_char(char c) {
/* RFC 2396 - Appendix A */
/* alphanum */
if (light_isalnum(c)) return 1;
switch(c) {
/* reserved */
case ';':
case '/':
case '?':
case ':':
case '@':
case '&':
case '=':
case '+':
case '$':
case ',':
/* mark */
case '-':
case '_':
case '.':
case '!':
case '~':
case '*':
case '\'':
case '(':
case ')':
/* escaped */
case '%':
/* fragment, should not be out in the wild $*/
case '#':
/* non RFC */
case '[':
case ']':
return 1;
}
return 0;
}
int http_request_parse(server *srv, connection *con) {
char *uri = NULL, *proto = NULL, *method = NULL, con_length_set;
int is_key = 1, key_len = 0, is_ws_after_key = 0, in_folding;
char *value = NULL, *key = NULL;
enum { HTTP_CONNECTION_UNSET, HTTP_CONNECTION_KEEPALIVE, HTTP_CONNECTION_CLOSE } keep_alive_set = HTTP_CONNECTION_UNSET;
int line = 0;
int request_line_stage = 0;
size_t i, first;
int done = 0;
data_string *ds = NULL;
/*
* Request: "^(GET|POST|HEAD) ([^ ]+(\\?[^ ]+|)) (HTTP/1\\.[01])$"
* Option : "^([-a-zA-Z]+): (.+)$"
* End : "^$"
*/
if (con->conf.log_request_header) {
log_error_write(srv, __FILE__, __LINE__, "sdsdSb",
"fd:", con->fd,
"request-len:", con->request.request->used,
"\n", con->request.request);
}
if (con->request_count > 1 &&
con->request.request->ptr[0] == '\r' &&
con->request.request->ptr[1] == '\n') {
/* we are in keep-alive and might get \r\n after a previous POST request.*/
buffer_copy_string_len(con->parse_request, con->request.request->ptr + 2, con->request.request->used - 1 - 2);
} else {
/* fill the local request buffer */
buffer_copy_string_buffer(con->parse_request, con->request.request);
}
keep_alive_set = 0;
con_length_set = 0;
/* parse the first line of the request
*
* should be:
*
* <method> <uri> <protocol>\r\n
* */
for (i = 0, first = 0; i < con->parse_request->used && line == 0; i++) {
char *cur = con->parse_request->ptr + i;
switch(*cur) {
case '\r':
if (con->parse_request->ptr[i+1] == '\n') {
http_method_t r;
char *nuri = NULL;
size_t j;
/* \r\n -> \0\0 */
con->parse_request->ptr[i] = '\0';
con->parse_request->ptr[i+1] = '\0';
buffer_copy_string_len(con->request.request_line, con->parse_request->ptr, i);
if (request_line_stage != 2) {
con->http_status = 400;
con->response.keep_alive = 0;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "s", "incomplete request line -> 400");
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
proto = con->parse_request->ptr + first;
*(uri - 1) = '\0';
*(proto - 1) = '\0';
/* we got the first one :) */
if (-1 == (r = get_http_method_key(method))) {
con->http_status = 501;
con->response.keep_alive = 0;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "s", "unknown http-method -> 501");
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
con->request.http_method = r;
if (0 == strncmp(proto, "HTTP/1.", sizeof("HTTP/1.") - 1)) {
if (proto[7] == '1') {
con->request.http_version = con->conf.allow_http11 ? HTTP_VERSION_1_1 : HTTP_VERSION_1_0;
} else if (proto[7] == '0') {
con->request.http_version = HTTP_VERSION_1_0;
} else {
con->http_status = 505;
log_error_write(srv, __FILE__, __LINE__, "s", "unknown HTTP version -> 505");
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
} else {
con->http_status = 400;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "s", "unknown protocol -> 400");
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
if (0 == strncmp(uri, "http://", 7) &&
NULL != (nuri = strchr(uri + 7, '/'))) {
/* ignore the host-part */
buffer_copy_string_len(con->request.uri, nuri, proto - nuri - 1);
} else {
/* everything looks good so far */
buffer_copy_string_len(con->request.uri, uri, proto - uri - 1);
}
/* check uri for invalid characters */
for (j = 0; j < con->request.uri->used - 1; j++) {
if (!request_uri_is_valid_char(con->request.uri->ptr[j])) {
con->http_status = 400;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "sd",
"invalid character in URI -> 400",
con->request.uri->ptr[j]);
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
}
buffer_copy_string_buffer(con->request.orig_uri, con->request.uri);
con->http_status = 0;
i++;
line++;
first = i+1;
}
break;
case ' ':
switch(request_line_stage) {
case 0:
/* GET|POST|... */
method = con->parse_request->ptr + first;
first = i + 1;
break;
case 1:
/* /foobar/... */
uri = con->parse_request->ptr + first;
first = i + 1;
break;
default:
/* ERROR, one space to much */
con->http_status = 400;
con->response.keep_alive = 0;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "s", "overlong request line -> 400");
if (srv->srvconf.log_request_header_on_error) {
log_error_write(srv, __FILE__, __LINE__, "Sb",
"request-header:\n",
con->request.request);
}
return 0;
}
request_line_stage++;
break;
}
}
in_folding = 0;
for (; i < con->parse_request->used && !done; i++) {
char *cur = con->parse_request->ptr + i;
if (is_key) {
size_t j;
int got_colon = 0;
/**
* 1*<any CHAR except CTLs or separators>
* CTLs == 0-31 + 127
*
*/
switch(*cur) {
case ':':
is_key = 0;
value = cur + 1;
if (is_ws_after_key == 0) {
key_len = i - first;
}
is_ws_after_key = 0;
break;
case '(':
case ')':
case '<':
case '>':
case '@':
case ',':
case ';':
case '\\':
case '\"':
case '/':
case '[':
case ']':
case '?':
case '=':
case '{':
case '}':
con->http_status = 400;
con->keep_alive = 0;
con->response.keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "sbsds",
"invalid character in key", con->request.request, cur, *cur, "-> 400");
return 0;
case ' ':
case '\t':
if (i == first) {
is_key = 0;
in_folding = 1;
value = cur;
break;
}
key_len = i - first;
/* skip every thing up to the : */
for (j = 1; !got_colon; j++) {
switch(con->parse_request->ptr[j + i]) {
case ' ':
case '\t':
/* skip WS */
continue;
case ':':
/* ok, done */
i += j - 1;
got_colon = 1;
break;
default:
/* error */
log_error_write(srv, __FILE__, __LINE__, "s", "WS character in key -> 400");
con->http_status = 400;
con->response.keep_alive = 0;
con->keep_alive = 0;
return 0;
}
}
break;
case '\r':
if (con->parse_request->ptr[i+1] == '\n' && i == first) {
/* End of Header */
con->parse_request->ptr[i] = '\0';
con->parse_request->ptr[i+1] = '\0';
i++;
done = 1;
break;
} else {
log_error_write(srv, __FILE__, __LINE__, "s", "CR without LF -> 400");
con->http_status = 400;
con->keep_alive = 0;
con->response.keep_alive = 0;
return 0;
}
/* fall thru */
case 0: /* illegal characters (faster than a if () :) */
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 10:
case 11:
case 12:
case 14:
case 15:
case 16:
case 17:
case 18:
case 19:
case 20:
case 21:
case 22:
case 23:
case 24:
case 25:
case 26:
case 27:
case 28:
case 29:
case 30:
case 31:
case 127:
con->http_status = 400;
con->keep_alive = 0;
con->response.keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "sbsds",
"CTL character in key", con->request.request, cur, *cur, "-> 400");
return 0;
default:
/* ok */
break;
}
} else {
switch(*cur) {
case '\r':
if (con->parse_request->ptr[i+1] == '\n') {
/* End of Headerline */
con->parse_request->ptr[i] = '\0';
con->parse_request->ptr[i+1] = '\0';
if (in_folding) {
if (!ds) {
/* 400 */
log_error_write(srv, __FILE__, __LINE__, "s", "WS at the start of first line -> 400");
con->http_status = 400;
con->keep_alive = 0;
con->response.keep_alive = 0;
return 0;
}
buffer_append_string(ds->value, value);
} else {
int s_len;
key = con->parse_request->ptr + first;
s_len = cur - value;
if (s_len > 0) {
int cmp = 0;
if (NULL == (ds = (data_string *)array_get_unused_element(con->request.headers, TYPE_STRING))) {
ds = data_string_init();
}
buffer_copy_string_len(ds->key, key, key_len);
buffer_copy_string_len(ds->value, value, s_len);
/* retreive values
*
*
* the list of options is sorted to simplify the search
*/
if (0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Connection")))) {
array *vals;
size_t vi;
/* split on , */
vals = srv->split_vals;
array_reset(vals);
http_request_split_value(vals, ds->value);
for (vi = 0; vi < vals->used; vi++) {
data_string *dsv = (data_string *)vals->data[vi];
if (0 == buffer_caseless_compare(CONST_BUF_LEN(dsv->value), CONST_STR_LEN("keep-alive"))) {
keep_alive_set = HTTP_CONNECTION_KEEPALIVE;
break;
} else if (0 == buffer_caseless_compare(CONST_BUF_LEN(dsv->value), CONST_STR_LEN("close"))) {
keep_alive_set = HTTP_CONNECTION_CLOSE;
break;
}
}
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Content-Length")))) {
char *err;
unsigned long int r;
size_t j;
if (ds->value->used == 0) SEGFAULT();
for (j = 0; j < ds->value->used - 1; j++) {
char c = ds->value->ptr[j];
if (!isdigit((unsigned char)c)) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"content-length broken:", ds->value, "-> 400");
con->http_status = 400;
con->keep_alive = 0;
array_insert_unique(con->request.headers, (data_unset *)ds);
return 0;
}
}
r = strtoul(ds->value->ptr, &err, 10);
if (*err == '\0') {
con_length_set = 1;
con->request.content_length = r;
} else {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"content-length broken:", ds->value, "-> 400");
con->http_status = 400;
con->keep_alive = 0;
array_insert_unique(con->request.headers, (data_unset *)ds);
return 0;
}
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Content-Type")))) {
con->request.http_content_type = ds->value->ptr;
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Expect")))) {
/* HTTP 2616 8.2.3
* Expect: 100-continue
*
* -> (10.1.1) 100 (read content, process request, send final status-code)
* -> (10.4.18) 417 (close)
*
* (not handled at all yet, we always send 417 here)
*/
con->http_status = 417;
con->keep_alive = 0;
array_insert_unique(con->request.headers, (data_unset *)ds);
return 0;
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Host")))) {
con->request.http_host = ds->value;
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("If-Modified-Since")))) {
con->request.http_if_modified_since = ds->value->ptr;
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("If-None-Match")))) {
con->request.http_if_none_match = ds->value->ptr;
} else if (cmp > 0 && 0 == (cmp = buffer_caseless_compare(CONST_BUF_LEN(ds->key), CONST_STR_LEN("Range")))) {
/* bytes=.*-.* */
if (0 == strncasecmp(ds->value->ptr, "bytes=", 6) &&
NULL != strchr(ds->value->ptr+6, '-')) {
con->request.http_range = ds->value->ptr + 6;
}
}
array_insert_unique(con->request.headers, (data_unset *)ds);
} else {
/* empty header-fields are not allowed by HTTP-RFC, we just ignore them */
}
}
i++;
first = i+1;
is_key = 1;
value = 0;
key_len = 0;
in_folding = 0;
} else {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"CR without LF", con->request.request, "-> 400");
con->http_status = 400;
con->keep_alive = 0;
con->response.keep_alive = 0;
return 0;
}
break;
case ' ':
case '\t':
/* strip leading WS */
if (value == cur) value = cur+1;
default:
break;
}
}
}
con->header_len = i;
/* do some post-processing */
if (con->request.http_version == HTTP_VERSION_1_1) {
if (keep_alive_set != HTTP_CONNECTION_CLOSE) {
/* no Connection-Header sent */
/* HTTP/1.1 -> keep-alive default TRUE */
con->keep_alive = 1;
} else {
con->keep_alive = 0;
}
/* RFC 2616, 14.23 */
if (con->request.http_host == NULL ||
buffer_is_empty(con->request.http_host)) {
con->http_status = 400;
con->response.keep_alive = 0;
con->keep_alive = 0;
log_error_write(srv, __FILE__, __LINE__, "s", "HTTP/1.1 but Host missing -> 400");
return 0;
}
} else {
if (keep_alive_set == HTTP_CONNECTION_KEEPALIVE) {
/* no Connection-Header sent */
/* HTTP/1.0 -> keep-alive default FALSE */
con->keep_alive = 1;
} else {
con->keep_alive = 0;
}
}
/* check hostname field if it is set */
if (NULL != con->request.http_host &&
0 != request_check_hostname(srv, con, con->request.http_host)) {
log_error_write(srv, __FILE__, __LINE__, "sbs",
"Invalid Hostname:", con->request.http_host, "-> 400");
con->http_status = 400;
con->response.keep_alive = 0;
con->keep_alive = 0;
return 0;
}
/* check if we have read post data */
if (con->request.http_method == HTTP_METHOD_POST) {
server_socket *srv_socket = con->srv_socket;
if (con->request.http_content_type == NULL) {
log_error_write(srv, __FILE__, __LINE__, "s",
"POST request, but content-type not set");
}
if (con_length_set == 0) {
/* content-length is missing */
log_error_write(srv, __FILE__, __LINE__, "s",
"POST-request, but content-length missing -> 411");
con->http_status = 411;
return 0;
}
/* don't handle more the SSIZE_MAX bytes in content-length */
if (con->request.content_length > SSIZE_MAX) {
con->http_status = 413;
log_error_write(srv, __FILE__, __LINE__, "sds",
"request-size too long:", con->request.content_length, "-> 413");
return 0;
}
/* divide by 1024 as srvconf.max_request_size is in kBytes */
if (srv_socket->max_request_size != 0 &&
(con->request.content_length >> 10) > srv_socket->max_request_size) {
/* the request body itself is larger then
* our our max_request_size
*/
con->http_status = 413;
log_error_write(srv, __FILE__, __LINE__, "sds",
"request-size too long:", con->request.content_length, "-> 413");
return 0;
}
/* we have content */
if (con->request.content_length != 0) {
return 1;
}
}
return 0;
}
int http_request_header_finished(server *srv, connection *con) {
UNUSED(srv);
if (con->request.request->used < 5) return 0;
if (0 == memcmp(con->request.request->ptr + con->request.request->used - 5, "\r\n\r\n", 4)) return 1;
if (NULL != strstr(con->request.request->ptr, "\r\n\r\n")) return 1;
return 0;
}