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/* $Id: http.c 17 2024-09-13 17:41:07Z nishi $ */
#define SOURCE
#include "tw_http.h"
#include "tw_server.h"
#include <cm_log.h>
#include <cm_string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#ifdef __MINGW32__
#include <winsock2.h>
#else
#include <sys/select.h>
#endif
void tw_free_request(struct tw_http_request* req) {
if(req->method != NULL) free(req->method);
if(req->path != NULL) free(req->path);
if(req->headers != NULL) {
int i;
for(i = 0; req->headers[i] != NULL; i++) free(req->headers[i]);
free(req->headers);
}
if(req->body != NULL) free(req->body);
if(req->version != NULL) free(req->version);
}
int tw_http_parse(SSL* ssl, int sock, struct tw_http_request* req) {
char buffer[512];
char cbuf[2];
int phase = 0;
fd_set fds;
bool bad = false;
cbuf[1] = 0;
req->method = NULL;
req->path = NULL;
req->headers = NULL;
req->body = NULL;
req->version = NULL;
char* header = malloc(1);
header[0] = 0;
int nl = 0;
while(1) {
FD_ZERO(&fds);
FD_SET(sock, &fds);
struct timeval tv;
tv.tv_sec = 5;
tv.tv_usec = 0;
int n = select(FD_SETSIZE, &fds, NULL, NULL, &tv);
if(n == 0) break;
int len = tw_read(ssl, sock, buffer, 512);
if(len <= 0) break;
int i;
for(i = 0; i < len; i++) {
char c = buffer[i];
if(phase == 0) {
if(c == ' ') {
if(req->method == NULL) {
tw_free_request(req);
bad = true;
goto getout;
} else {
phase++;
}
} else {
if(req->method == NULL) {
req->method = malloc(1);
req->method[0] = 0;
}
cbuf[0] = c;
char* tmp = req->method;
req->method = cm_strcat(tmp, cbuf);
free(tmp);
}
} else if(phase == 1) {
if(c == ' ') {
if(req->path == NULL) {
tw_free_request(req);
bad = true;
goto getout;
} else {
phase++;
}
} else {
if(req->path == NULL) {
req->path = malloc(1);
req->path[0] = 0;
}
cbuf[0] = c;
char* tmp = req->path;
req->path = cm_strcat(tmp, cbuf);
free(tmp);
}
} else if(phase == 2) {
if(c == '\n') {
if(req->version == NULL) {
tw_free_request(req);
bad = true;
goto getout;
} else {
/* We have Method, Path, Version now */
if(strcmp(req->version, "HTTP/1.1") != 0 && strcmp(req->version, "HTTP/1.0") != 0) {
cm_log("HTTP", "Bad HTTP Version");
bad = true;
goto getout;
}
int j;
char* p = malloc(1);
p[0] = 0;
for(j = 0; req->path[j] != 0; j++) {
if(req->path[j] == '/') {
cbuf[0] = '/';
for(; req->path[j] != 0 && req->path[j] == '/'; j++)
;
j--;
} else {
cbuf[0] = req->path[j];
}
char* tmp = p;
p = cm_strcat(tmp, cbuf);
free(tmp);
}
free(req->path);
req->path = p;
int incr = 0;
p = malloc(1);
p[0] = 0;
for(j = 0;; j++) {
if(req->path[j] == '/' || req->path[j] == 0) {
char oldc = req->path[j];
cbuf[0] = oldc;
req->path[j] = 0;
char* pth = req->path + incr;
if(strcmp(pth, "..") == 0) {
int k;
if(p[strlen(p) - 1] == '/') p[strlen(p) - 1] = 0;
for(k = strlen(p) - 1; k >= 0; k--) {
if(p[k] == '/') {
p[k + 1] = 0;
break;
}
}
if(strlen(p) == 0) {
free(p);
p = cm_strdup("/");
}
} else if(strcmp(pth, ".") == 0) {
} else {
char* tmp = p;
p = cm_strcat3(tmp, pth, cbuf);
free(tmp);
}
incr = j + 1;
if(oldc == 0) break;
}
}
free(req->path);
req->path = p;
cm_log("HTTP", "Request: %s %s %s", req->method, req->path, req->version);
phase++;
}
} else if(c != '\r') {
if(req->version == NULL) {
req->version = malloc(1);
req->version[0] = 0;
}
cbuf[0] = c;
char* tmp = req->version;
req->version = cm_strcat(tmp, cbuf);
free(tmp);
}
} else if(phase == 3) {
if(c == '\n') {
nl++;
if(nl == 2) {
phase++;
goto getout;
} else {
if(req->headers == NULL) {
req->headers = malloc(sizeof(*req->headers));
req->headers[0] = NULL;
}
int j;
for(j = 0; header[j] != 0; j++) {
if(header[j] == ':') {
header[j] = 0;
j++;
for(; header[j] != 0 && (header[j] == ' ' || header[j] == '\t'); j++)
;
char* kv = header;
char* vv = header + j;
char** old = req->headers;
int k;
for(k = 0; old[k] != NULL; k++)
;
req->headers = malloc(sizeof(*req->headers) * (k + 3));
for(k = 0; old[k] != NULL; k++) req->headers[k] = old[k];
req->headers[k] = cm_strdup(kv);
req->headers[k + 1] = cm_strdup(vv);
req->headers[k + 2] = NULL;
free(old);
cm_log("HTTP", "Header: %s: %s", kv, vv);
break;
}
}
free(header);
header = malloc(1);
header[0] = 0;
}
} else if(c != '\r') {
nl = 0;
cbuf[0] = c;
char* tmp = header;
header = cm_strcat(tmp, cbuf);
free(tmp);
}
}
}
}
getout:
free(header);
if(bad) {
tw_free_request(req);
return 1;
}
return 0;
}