mirror of
https://github.com/sigmasternchen/Serwer
synced 2025-03-15 07:08:54 +00:00
758 lines
17 KiB
C
758 lines
17 KiB
C
#include "webserver.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include "help.h"
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <time.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.h>
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#include <stdarg.h>
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bool ws_host_match(const char* host, const char* match) {
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// only two possible positions for wildcard: begin and end
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int lenh = strlen(host);
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int lenm = strlen(match);
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if (lenm > lenh)
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return false;
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bool wildcard = false;
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int wnext = -1;
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int found = -1;
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int h = 0, int = 0;
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for (; m < lenm && h < lenh; m++, h++) {
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if (match[m] == '*') {
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wildcard = true;
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wnext = m + 1;
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found = -1;
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// current host char matches automatically
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continue;
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}
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if (wildcard) {
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if (found == -1) {
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if (match[m] != host[h])
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m--;
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else
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found = h;
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} else {
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if (match[m] != host[h]) {
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// found was negated; reset cursor positions
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m = wnext;
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h = found + 1;
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found = -1;
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}
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}
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} else {
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if (match[m] != host[h])
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return false;
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}
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}
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// if not whole match string matches, return false
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if (m != lenm)
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return false;
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return true;
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}
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bool ws_path_match(const char* path, const char* match) {
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// TODO wildcards
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int lenp = strlen(path);
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int lenm = strlen(match);
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if (lenm > lenp)
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return false;
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bool wildcard = false;
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int wnext = -1;
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int found = -1;
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int p = 0, m = 0;
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for (; m < lenm && p < lenp; m++, p++) {
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if (match[m] == '*') {
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wildcard = true;
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wnext = m + 1;
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found = -1;
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// current host char matches automatically
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continue;
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}
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if (wildcard) {
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if (found < 0) {
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if (match[m] != path[p])
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m--;
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else
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found = p;
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} else {
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if (match[m] != path[p]) {
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// found was negated; reset cursor positions
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m = wnext;
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p = found + 1;
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found = -1;
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}
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}
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// if directory end
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if (path[p] == '/') {
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// found is here only true if match[m] = path[p] = '/'
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if (found >= 0) {
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wildcard = false;
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} else {
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return false;
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}
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}
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} else {
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if (match[m] != path[p])
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return false;
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}
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}
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// if not whole match string used, return false
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if (m != lenm)
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return false;
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return true;
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}
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handler_t ws_handler_find(webserver_t* server, const char* path, const char* host) {
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for (int i = 0; i < server->nrhandles; i++) {
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handle_t handle = server->handles[i];
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if (handle.host != NULL) {
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if (!ws_host_match(host, handle.host))
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continue;
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}
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if (handle.path != NULL) {
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if (!ws_path_match(path, handle.path))
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continue;
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}
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return handle.handler;
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}
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return NULL;
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}
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char* ws_host_find(const char** path, headers_t headers) {
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char* host = NULL;
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for (int i = 0; i < headers.nrfields; i++) {
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header_t header = headers.fields[i];
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if (strcmp(header.key, "Host") == 0) {
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host = (char*) malloc(strlen(header.value) + 1);
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memcpy(host, header.value, strlen(header.value) + 1);
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return host;
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}
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}
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if (strlen(*path) <= strlen("http://"))
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return host;
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if ((*path)[0] == '/')
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return host;
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bool setHost = false;
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if (host == NULL) {
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setHost = true;
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host = (char*) malloc(strlen(*path) + 1);
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}
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int hposition = 0;
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int nrslash = 0;
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size_t len = strlen(*path);
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for (size_t i = 0; i < len; i++) {
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if (nrslash < 2) {
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// http://
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} else if (nrslash < 3) {
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if (setHost) {
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host[hposition++] = (*path)[i];
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/*if ((*path)[i] == ':') {
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host[hposition - 1] = '\0';
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setHost = false;
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}*/
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}
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} else {
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// rebase path
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*path = *path + i;
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break;
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}
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if ((*path)[i] == '/')
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nrslash++;
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}
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if (setHost) {
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host[hposition] = '\0';
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host = (char*) realloc(host, strlen(host) + 1);
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}
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return host;
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}
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const char* ws_strm(method_t method) {
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switch(method) {
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case OPTIONS:
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return "OPTIONS";
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case GET:
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return "GET";
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case HEAD:
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return "HEAD";
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case POST:
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return "POST";
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case PUT:
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return "PUT";
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case DELETE:
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return "DELETE";
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case TRACE:
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return "TRACE";
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case CONNECT:
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return "CONNECT";
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}
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}
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int ws_request_parse(char* buffer, const char** path, method_t* method) {
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char lbuffer[8];
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int position = 0;
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int state = 0;
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size_t len = strlen(buffer);
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for(size_t i = 0; i < len; i++) {
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switch(state) {
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case 0: // method
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if (buffer[i] != ' ') {
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lbuffer[position++] = buffer[i];
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if (position > 7)
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return -1; // method name too long
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} else {
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state++;
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lbuffer[position] = '\0';
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if (strcmp(lbuffer, "OPTIONS") == 0)
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*method = OPTIONS;
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else if (strcmp(lbuffer, "GET") == 0)
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*method = GET;
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else if (strcmp(lbuffer, "HEAD") == 0)
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*method = HEAD;
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else if (strcmp(lbuffer, "POST") == 0)
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*method = POST;
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else if (strcmp(lbuffer, "PUT") == 0)
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*method = PUT;
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else if (strcmp(lbuffer, "DELETE") == 0)
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*method = DELETE;
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else if (strcmp(lbuffer, "TRACE") == 0)
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*method = TRACE;
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else if (strcmp(lbuffer, "CONNECT") == 0)
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*method = CONNECT;
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else
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return -2; // unknown method
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}
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break;
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case 1: // path begin
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if (buffer[i] == ' ' || buffer[i] == '\r')
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return -3; // malformed;
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*path = buffer + i;
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state++;
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break;
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case 2: // path
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if (buffer[i] == ' ') {
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buffer[i] = '\0';
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position = 0;
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state++;
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}
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break;
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case 3: // version
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if (buffer[i] != '\r') {
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lbuffer[position++] = buffer[i];
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if (position > 7)
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return -4; // version too long
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} else {
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lbuffer[position] = '\0';
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// we just support HTTP 1.0 and 1.1
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if (!strcmp(lbuffer, "HTTP/1.0"))
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return 0;
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if (!strcmp(lbuffer, "HTTP/1.1"))
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return 0;
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return -5;
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}
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break;
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default:
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assert(false);
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}
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}
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return 0;
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}
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headers_t ws_headers_create(void) {
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headers_t headers;
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headers.fields = (header_t*) malloc(0 * sizeof(header_t));
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headers.nrfields = 0;
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return headers;
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}
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void ws_headers_add(headers_t* headers, const char* key, const char* value) {
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headers->fields = (header_t*) realloc(headers->fields, ++(headers->nrfields) * sizeof(header_t));
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headers->fields[headers->nrfields - 1].key = key;
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headers->fields[headers->nrfields - 1].value = value;
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}
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void ws_headers_convert(headers_t* headers, char* line) {
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const char* key = line;
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const char* value = NULL;
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bool foundSeperator = false;
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for (int i = 0; line[i] != '\0'; i++) {
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if (foundSeperator) {
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if (value == NULL) {
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if (line[i] != ' ') {
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value = line + i;
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}
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} else {
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if (line[i] == '\r' || line[i] == '\n') {
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line[i] = '\0';
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break;
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}
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}
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} else {
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if (line[i] == ':') {
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line[i] = '\0';
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foundSeperator = true;
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}
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}
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}
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if (value != NULL)
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ws_headers_add(headers, key, value);
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}
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void ws_headers_free(headers_t* headers) {
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free(headers->fields);
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headers->fields = NULL;
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headers->nrfields = 0;
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}
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int ws_listen(webserver_t* server) {
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struct addrinfo hints;
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struct addrinfo *result, *rp;
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int s;
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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s = getaddrinfo(server->host, server->port, &hints, &result);
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if (s != 0) {
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fprintf(stderr, "%s: ws_bind: getaddrinfo: %s\n", progname, gai_strerror(s));
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bail_out(EXIT_FAILURE, NULL);
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}
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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server->sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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if (server->sfd == -1)
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continue;
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const int on = 1;
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setsockopt(server->sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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if (bind(server->sfd, rp->ai_addr, rp->ai_addrlen) == 0)
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break; // Success
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close(server->sfd);
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}
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if (rp == NULL)
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return -1;
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if (listen(server->sfd, server->options.maxconnections) < 0)
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return -1;
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freeaddrinfo(result);
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return 0;
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}
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void ws_handle_add(webserver_t* server, handle_t handle) {
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server->handles = (handle_t*) realloc(server->handles, ++(server->nrhandles) * sizeof(handle_t));
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server->handles[server->nrhandles - 1] = handle;
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}
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webserver_t ws_create(const char* name, const char* host, const char* port, FILE* logfile, srvoptions_t options) {
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webserver_t server;
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server.name = name;
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server.host = host;
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server.port = port;
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server.logfile = logfile;
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server.nrhandles = 0;
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server.handles = (handle_t*) malloc(0);
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server.options.mode = LINEAR;
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server.options.timeout = 30;
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server.options = options;
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if (ws_listen(&server) < 0)
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bail_out(EXIT_FAILURE, "ws_listen");
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return server;
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}
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void ws_log(webserver_t* server, loglevel_t loglevel, const char* format, ...) {
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if (loglevel > server->options.loglevel)
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return;
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if (server->logfile == NULL)
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return;
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time_t rawtime;
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struct tm* timeinfo;
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time(&rawtime);
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timeinfo = localtime(&rawtime);
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char buffer[26];
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strftime(buffer, 26, "%Y.%m.%d-%H:%M:%S", timeinfo);
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va_list arg;
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fprintf(server->logfile, "%s: %s: ", buffer, server->name);
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va_start(arg, format);
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vfprintf(server->logfile, format, arg);
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va_end(arg);
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fprintf(server->logfile, "\n");
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}
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const char* ws_code_reason(int code) {
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switch(code) {
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case 100:
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return "Continue";
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case 101:
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return "Switching Protocols";
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case 200:
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return "OK";
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case 201:
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return "Created";
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case 202:
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return "Accepted";
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case 203:
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return "Non-Authoritative Information";
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case 204:
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return "No Content";
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case 205:
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return "Reset Content";
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case 206:
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return "Partial Content";
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case 300:
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return "Multible Choices";
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case 301:
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return "Moved Permanently";
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case 302:
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return "Found";
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case 303:
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return "See Other";
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case 304:
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return "Not Modified";
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case 305:
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return "Use Proxy";
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case 307:
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return "Temporary Redirect";
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case 400:
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return "Bad Request";
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case 401:
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return "Unauthorized";
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case 402:
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return "Payment Required";
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case 403:
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return "Forbidden";
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case 404:
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return "Not Found";
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case 405:
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return "Method Not Allowed";
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case 406:
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return "Not Acceptable";
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case 407:
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return "Proxy Authentication Required";
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case 408:
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return "Request Time-out";
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case 409:
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return "Conflict";
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case 410:
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return "Gone";
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case 411:
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return "Length Required";
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case 412:
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return "Precondition Failed";
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case 413:
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return "Request Entify Too Large";
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case 414:
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return "Request-URI Too Large";
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case 415:
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return "Unsupported Media Type";
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case 416:
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return "Requested range not satisfiable";
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case 417:
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return "Expectation Failed";
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case 500:
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return "Internal Server Error";
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case 501:
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return "Not Implemented";
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case 502:
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return "Bad Gateway";
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case 503:
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return "Service Unavailable";
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case 504:
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return "Gateway Time-out";
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case 505:
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return "HTTP Version not supported";
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default:
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return "Unknown extension code";
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}
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}
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void ws_send(int connfd, int code, headers_t headers, int pipefd) {
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stream_t connection = (stream_t) fdopen(connfd, "a+");
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setbuf(connection, NULL);
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fprintf(connection, "%s %i %s\r\n", WS_HTTP_VERSION, code, ws_code_reason(code));
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bool serverHeader = false;
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for (int i = 0; i < headers.nrfields; i++) {
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header_t header = headers.fields[i];
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if (strcmp(header.key, "Server") == 0)
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serverHeader = true;
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fprintf(connection, "%s: %s\r\n", header.key, header.value);
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}
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if (!serverHeader)
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fprintf(connection, "Server: %s %s\r\n", WS_NAME, WS_VERSION);
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fprintf(connection, "\r\n");
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fflush(connection);
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if (pipefd == -1) {
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fclose(connection);
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return;
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}
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char buffer[BUFFER_SIZE];
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int bs = 0;
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while ((bs = read(pipefd, buffer, BUFFER_SIZE)) > 0)
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write(connfd, buffer, bs);
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fclose(connection);
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}
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void ws_simple_status(int connfd, int code) {
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ws_send(connfd, code, (headers_t) {.fields = NULL, .nrfields = 0}, -1);
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}
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int ws_run_linear(webserver_t* server) {
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struct sockaddr_storage peer_addr;
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socklen_t peer_addr_len;
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int s;
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int connfd;
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char* buffer = (char*) malloc(BUFFER_SIZE * sizeof(char));
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int buffersize = 0;
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int nb = 1;
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char* header = (char*) malloc(BUFFER_SIZE * sizeof(char));
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int headersize = 0;
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int nhb = 1;
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int headerlines = 0;
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while (true) {
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if((connfd = accept(server->sfd, (struct sockaddr*) &peer_addr, &peer_addr_len)) < 0) {
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return -1;
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}
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char phost[NI_MAXHOST], service[NI_MAXSERV];
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s = getnameinfo((struct sockaddr *) &peer_addr,
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peer_addr_len, phost, NI_MAXHOST, service,
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NI_MAXSERV, NI_NUMERICSERV);
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|
if (s == 0)
|
|
ws_log(server, LOG_DEBUG, "Connection from %s:%s", phost, service);
|
|
else
|
|
ws_log(server, LOG_DEBUG, "getnameinfo: %s", gai_strerror(s));
|
|
|
|
headers_t headers = ws_headers_create();
|
|
char* host = NULL;
|
|
method_t method;
|
|
const char* path = NULL;
|
|
|
|
while(true) {
|
|
if (read(connfd, buffer + buffersize++, 1) < 1) {
|
|
ws_log(server, LOG_TESTING, "read: %s", strerror(errno));
|
|
// error or disconect
|
|
break;
|
|
}
|
|
|
|
if (buffersize > nb * BUFFER_SIZE - 1) {
|
|
nb++;
|
|
buffer = (char*) realloc(buffer, nb * BUFFER_SIZE * sizeof(char));
|
|
}
|
|
|
|
buffer[buffersize] = '\0';
|
|
|
|
if (buffer[buffersize - 1] == '\n') {
|
|
ws_log(server, LOG_TESTING, "got line: %i, %s", buffersize, buffer);
|
|
|
|
// line end
|
|
if (buffersize == 1) {
|
|
// TODO 400
|
|
ws_simple_status(connfd, 400);
|
|
break;
|
|
}
|
|
if (buffer[buffersize - 2] != '\r') {
|
|
// TODO 400
|
|
ws_simple_status(connfd, 400);
|
|
break;
|
|
}
|
|
// buffer contains the line + \r\n\0
|
|
|
|
if (buffersize == 3 - 1) { // "\r\n" + \0
|
|
ws_log(server, LOG_TESTING, "got last header line");
|
|
|
|
if (headerlines < 1) {
|
|
// TODO 400
|
|
ws_simple_status(connfd, 400);
|
|
break;
|
|
}
|
|
|
|
ws_log(server, LOG_TESTING, "find host");
|
|
host = ws_host_find(&path, headers);
|
|
ws_log(server, LOG_DEBUG, "uri: %s%s", host, path);
|
|
|
|
// find handler
|
|
ws_log(server, LOG_TESTING, "find handler");
|
|
handler_t handler = ws_handler_find(server, path, host);
|
|
|
|
if (handler == NULL) {
|
|
// TODO 404
|
|
ws_log(server, LOG_DEBUG, "handler not found");
|
|
ws_simple_status(connfd, 404);
|
|
break;
|
|
}
|
|
ws_log(server, LOG_TESTING, "found");
|
|
|
|
int pipefd[2];
|
|
|
|
ws_log(server, LOG_TESTING, "create pipe");
|
|
if (pipe(pipefd) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
ws_log(server, LOG_TESTING, "create response header struct");
|
|
headers_t responseHeaders = ws_headers_create();
|
|
ws_log(server, LOG_TESTING, "open request stream");
|
|
stream_t request = (stream_t) fdopen(connfd, "r");
|
|
|
|
if (request == NULL) {
|
|
ws_log(server, LOG_DEBUG, "fdopen: %s", strerror(errno));
|
|
}
|
|
|
|
//fopen write end of pipe
|
|
ws_log(server, LOG_TESTING, "open pipe stream");
|
|
stream_t response = (stream_t) fdopen(pipefd[1], "w");
|
|
|
|
if (response == NULL) {
|
|
ws_log(server, LOG_DEBUG, "fdopen: %s", strerror(errno));
|
|
}
|
|
|
|
// unbuffer
|
|
setbuf(request, NULL);
|
|
|
|
// handler
|
|
ws_log(server, LOG_DEBUG, "execute handler");
|
|
int code = (*handler)(method, host, path, headers, &responseHeaders, request, response);
|
|
ws_log(server, LOG_TESTING, "handler finished with %i", code);
|
|
|
|
fclose(response);
|
|
|
|
// send
|
|
ws_log(server, LOG_TESTING, "sending response");
|
|
ws_send(connfd, code, responseHeaders, pipefd[0]);
|
|
|
|
// cleanup
|
|
ws_log(server, LOG_DEBUG, "cleanup");
|
|
close(pipefd[0]);
|
|
fclose(request);
|
|
ws_headers_free(&responseHeaders);
|
|
|
|
ws_log(server, LOG_TESTING, "done");
|
|
|
|
break;
|
|
}
|
|
|
|
ws_log(server, LOG_TESTING, "enlarging header buffer");
|
|
while (headersize + buffersize + 1 > nhb * BUFFER_SIZE) {
|
|
nhb++;
|
|
header = (char*) realloc(header, nhb * BUFFER_SIZE * sizeof(char));
|
|
}
|
|
|
|
memcpy(header + headersize, buffer, buffersize + 1);
|
|
header[headersize + buffersize] = '\0';
|
|
// new line is now permanently saved in header + headersize
|
|
|
|
if (headerlines++ == 0) {
|
|
ws_log(server, LOG_TESTING, "parsing first line");
|
|
int e;
|
|
if ((e = ws_request_parse(header + headersize, &path, &method)) < 0) {
|
|
ws_log(server, LOG_DEBUG, "parsing error: %i", e);
|
|
// TODO 400
|
|
ws_simple_status(connfd, 400);
|
|
break;
|
|
}
|
|
ws_log(server, LOG_TESTING, "path: %s", path);
|
|
} else {
|
|
// convert to header struct
|
|
ws_log(server, LOG_TESTING, "convert line to headerstruct");
|
|
ws_headers_convert(&headers, header + headersize);
|
|
ws_log(server, LOG_DEBUG, "header: %s: %s", headers.fields[headers.nrfields - 1].key,
|
|
headers.fields[headers.nrfields - 1].value);
|
|
}
|
|
headersize += buffersize + 1;
|
|
|
|
ws_log(server, LOG_TESTING, "reset buffer");
|
|
buffer = (char*) realloc(buffer, BUFFER_SIZE * sizeof(char));
|
|
nb = 1;
|
|
buffersize = 0;
|
|
}
|
|
}
|
|
|
|
header = (char*) realloc(header, BUFFER_SIZE * sizeof(char));
|
|
nhb = 1;
|
|
headersize = 0;
|
|
|
|
headerlines = 0;
|
|
|
|
ws_headers_free(&headers);
|
|
|
|
if (host != NULL)
|
|
free(host);
|
|
host = NULL;
|
|
|
|
buffer = (char*) realloc(buffer, BUFFER_SIZE * sizeof(char));
|
|
nb = 1;
|
|
buffersize = 0;
|
|
}
|
|
|
|
free(buffer);
|
|
free(header);
|
|
}
|
|
|
|
int ws_run(webserver_t* server) {
|
|
switch(server->options.mode) {
|
|
case LINEAR:
|
|
return ws_run_linear(server);
|
|
default:
|
|
errno = EBADRQC;
|
|
return -1;
|
|
}
|
|
}
|