Compare commits
2 Commits
5c5cda5f51
...
0984a1cb1b
| Author | SHA1 | Date | |
|---|---|---|---|
|
0984a1cb1b | ||
|
|
4d30b297a5 |
7
Makefile
7
Makefile
|
|
@ -1,12 +1,11 @@
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|||
CC=bear --append -- gcc
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||||
CFLAGS= -g -Wall -Werror
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||||
CC=gcc
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||||
CFLAGS= -g3 -Wall -Werror
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||||
|
||||
all: proxy
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||||
|
||||
proxy: proxy.c
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||||
$(CC) $(CFLAGS) -o proxy_parse.o -c proxy_parse.c
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||||
$(CC) $(CFLAGS) -o proxy.o -c proxy.c
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$(CC) $(CFLAGS) -o proxy proxy_parse.o proxy.o
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$(CC) $(CFLAGS) -o proxy proxy.o
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||||
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clean:
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rm -f proxy *.o
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||||
|
|
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|||
29
README
29
README
|
|
@ -1,11 +1,22 @@
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|||
============
|
||||
CUSTOM PROXY
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||||
============
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||||
+==================+
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||||
| CUSTOM PROXY |
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||||
+==================+
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||||
|
||||
Proxy for HTTP/1.0 standard protocol
|
||||
Proxy for HTTP/1.0 standard protocol
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||||
|
||||
RFC: datatracker.ietf.org/doc/html/rfc1945
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||||
RES: cs.princeton.edu/courses/archive/spr13/cos461/assignments-proxy.html
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||||
RES: Beej's Guide to Network Programming - Using Internet Sockets
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||||
RES: en.wikipedia.org/wiki/Proxy_server
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||||
RES: TCP/IP sockets in C - Practical guide for programmers 2nd edition
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||||
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||||
COMMITS
|
||||
|
||||
Each commit is prefixed with an indicator token of what the change is
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||||
*mostly* about. List of tokens is:
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||||
|
||||
* init: change initialized the repository
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||||
* repo: change is about the repository in general
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||||
* proxy: change is about the proxy in general
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* logic: change is about proxy logic - parsing, forwarding, ...
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||||
RFC: datatracker.ietf.org/doc/html/rfc1945
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RES: cs.princeton.edu/courses/archive/spr13/cos461/assignments-proxy.html
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||||
RES: Beej's Guide to Network Programming - Using Internet Sockets
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||||
RES: en.wikipedia.org/wiki/Proxy_server
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RES: TCP/IP sockets in C - Practical guide for programmers 2nd edition
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||||
|
|
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109
proxy.c
109
proxy.c
|
|
@ -5,6 +5,7 @@
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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 <regex.h>
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#include "structs.h"
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#define PROXY_PORT 2020
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|
|
@ -12,54 +13,77 @@
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|||
#define PROXY_MAX_MSGLEN 10*1024
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#define TITLE_DELIM " "
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||||
|
||||
#define REGEX_MATCHN 4
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#define REGEX_TITLE "^([A-Z]+)[ ]+([a-zA-Z0-9\\:\\/\\_\\-\\.\\,]+)[ ]+([a-zA-Z0-9\\_\\-\\.\\,\\/]+)[ ]*[$\n\r]"
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||||
#define REGEX_HEADER "^(.*)[$\\n\\r]"
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||||
|
||||
struct http_msg *child_msg;
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||||
regex_t preg;
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||||
regmatch_t pmatch[REGEX_MATCHN];
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||||
|
||||
void *extractsub(const char *msg, regmatch_t match) {
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||||
int buflen = match.rm_eo - match.rm_so;
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||||
void *buf = (void *) calloc(1, buflen);
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||||
if (buf == NULL)
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||||
goto _return;
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||||
|
||||
sprintf(buf, "%.*s", buflen, &msg[match.rm_so]);
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||||
|
||||
_return:
|
||||
return buf;
|
||||
}
|
||||
|
||||
int parse_header(char *msgbuff) {
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||||
return 0;
|
||||
}
|
||||
|
||||
int parse_title(char *msgbuff) {
|
||||
char *title_end = strrchr(msgbuff, '\n');
|
||||
if (title_end == NULL) {
|
||||
return -1;
|
||||
}
|
||||
int ret;
|
||||
|
||||
const int title_len = title_end - msgbuff;
|
||||
char title[title_len];
|
||||
strncpy(title, msgbuff, title_len);
|
||||
ret = regcomp(&preg, REGEX_TITLE, REG_EXTENDED);
|
||||
if (ret != 0)
|
||||
goto _err;
|
||||
|
||||
char *title_sub;
|
||||
int index;
|
||||
for (index = 0, title_sub = strtok(title, TITLE_DELIM);
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||||
title_sub != NULL;
|
||||
title_sub = strtok(NULL, TITLE_DELIM), index++) {
|
||||
|
||||
char *destarr = (char *) calloc(1, strlen(title_sub)+1);
|
||||
if (destarr == NULL) {
|
||||
goto error_title_props;
|
||||
}
|
||||
ret = regexec(&preg, msgbuff, REGEX_MATCHN, pmatch, 0);
|
||||
if (ret != 0)
|
||||
goto _err;
|
||||
|
||||
if (index == 0) {
|
||||
child_msg->method = destarr;
|
||||
strcpy(child_msg->method, title_sub);
|
||||
}
|
||||
else if (index == 1) {
|
||||
child_msg->uri = destarr;
|
||||
strcpy(child_msg->uri, title_sub);
|
||||
}
|
||||
else if (index == 2) {
|
||||
child_msg->ver = destarr;
|
||||
strcpy(child_msg->ver, title_sub);
|
||||
}
|
||||
else {
|
||||
goto error_title_props;
|
||||
}
|
||||
}
|
||||
child_msg->method = extractsub(msgbuff, pmatch[1]);
|
||||
if (child_msg->method == NULL)
|
||||
goto _err;
|
||||
|
||||
child_msg->uri = extractsub(msgbuff, pmatch[2]);
|
||||
if (child_msg->uri == NULL)
|
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goto _err;
|
||||
|
||||
child_msg->ver = extractsub(msgbuff, pmatch[3]);
|
||||
if (child_msg->ver == NULL)
|
||||
goto _err;
|
||||
|
||||
goto _ok;
|
||||
|
||||
_err:
|
||||
regfree(&preg);
|
||||
return -1;
|
||||
|
||||
_ok:
|
||||
regfree(&preg);
|
||||
return 0;
|
||||
|
||||
error_title_props:
|
||||
for (int i = 0; i <= index; i++) {
|
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free(child_msg+i);
|
||||
}
|
||||
|
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int par_line = 0;
|
||||
|
||||
int parse_line(char *line, int line_count) {
|
||||
int ret = 0;
|
||||
|
||||
if (line_count == 0) {
|
||||
ret = parse_title(line);
|
||||
} else {
|
||||
ret = parse_header(line);
|
||||
}
|
||||
|
||||
return -1;
|
||||
return ret;
|
||||
}
|
||||
|
||||
void handle_request(int sockfd) {
|
||||
|
|
@ -83,14 +107,19 @@ void handle_request(int sockfd) {
|
|||
goto end_sock;
|
||||
}
|
||||
|
||||
for (char *ln = strtok(msgbuff, "\n"); ln != NULL; ln = strtok(NULL, "\n"), par_line++) {
|
||||
parse_line(ln, par_line);
|
||||
}
|
||||
|
||||
// start parsing
|
||||
ret = parse_title(msgbuff);
|
||||
/*ret = parse_title(msgbuff);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "[CHILD %d] Failed to parse the title of the request\n", id);
|
||||
goto end_structs;
|
||||
}
|
||||
}*/
|
||||
|
||||
end_structs:
|
||||
|
||||
//end_structs:
|
||||
free(child_msg);
|
||||
|
||||
end_sock:
|
||||
|
|
|
|||
604
proxy_parse.c
604
proxy_parse.c
|
|
@ -1,604 +0,0 @@
|
|||
/*
|
||||
proxy_parse.c -- a HTTP Request Parsing Library.
|
||||
COS 461
|
||||
*/
|
||||
|
||||
#include "proxy_parse.h"
|
||||
|
||||
#define DEFAULT_NHDRS 8
|
||||
#define MAX_REQ_LEN 65535
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||||
#define MIN_REQ_LEN 4
|
||||
|
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static const char *root_abs_path = "/";
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||||
|
||||
/* private function declartions */
|
||||
int ParsedRequest_printRequestLine(struct ParsedRequest *pr,
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char * buf, size_t buflen,
|
||||
size_t *tmp);
|
||||
size_t ParsedRequest_requestLineLen(struct ParsedRequest *pr);
|
||||
|
||||
/*
|
||||
* debug() prints out debugging info if DEBUG is set to 1
|
||||
*
|
||||
* parameter format: same as printf
|
||||
*
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||||
*/
|
||||
void debug(const char * format, ...) {
|
||||
va_list args;
|
||||
if (DEBUG) {
|
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va_start(args, format);
|
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vfprintf(stderr, format, args);
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va_end(args);
|
||||
}
|
||||
}
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||||
|
||||
|
||||
/*
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||||
* ParsedHeader Public Methods
|
||||
*/
|
||||
|
||||
/* Set a header with key and value */
|
||||
int ParsedHeader_set(struct ParsedRequest *pr,
|
||||
const char * key, const char * value)
|
||||
{
|
||||
struct ParsedHeader *ph;
|
||||
ParsedHeader_remove (pr, key);
|
||||
|
||||
if (pr->headerslen <= pr->headersused+1) {
|
||||
pr->headerslen = pr->headerslen * 2;
|
||||
pr->headers =
|
||||
(struct ParsedHeader *)realloc(pr->headers,
|
||||
pr->headerslen * sizeof(struct ParsedHeader));
|
||||
if (!pr->headers)
|
||||
return -1;
|
||||
}
|
||||
|
||||
ph = pr->headers + pr->headersused;
|
||||
pr->headersused += 1;
|
||||
|
||||
ph->key = (char *)malloc(strlen(key)+1);
|
||||
memcpy(ph->key, key, strlen(key));
|
||||
ph->key[strlen(key)] = '\0';
|
||||
|
||||
ph->value = (char *)malloc(strlen(value)+1);
|
||||
memcpy(ph->value, value, strlen(value));
|
||||
ph->value[strlen(value)] = '\0';
|
||||
|
||||
ph->keylen = strlen(key)+1;
|
||||
ph->valuelen = strlen(value)+1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* get the parsedHeader with the specified key or NULL */
|
||||
struct ParsedHeader* ParsedHeader_get(struct ParsedRequest *pr,
|
||||
const char * key)
|
||||
{
|
||||
size_t i = 0;
|
||||
struct ParsedHeader * tmp;
|
||||
while(pr->headersused > i)
|
||||
{
|
||||
tmp = pr->headers + i;
|
||||
if(tmp->key && key && strcmp(tmp->key, key) == 0)
|
||||
{
|
||||
return tmp;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* remove the specified key from parsedHeader */
|
||||
int ParsedHeader_remove(struct ParsedRequest *pr, const char *key)
|
||||
{
|
||||
struct ParsedHeader *tmp;
|
||||
tmp = ParsedHeader_get(pr, key);
|
||||
if(tmp == NULL)
|
||||
return -1;
|
||||
|
||||
free(tmp->key);
|
||||
free(tmp->value);
|
||||
tmp->key = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* modify the header with given key, giving it a new value
|
||||
* return 1 on success and 0 if no such header found
|
||||
*
|
||||
int ParsedHeader_modify(struct ParsedRequest *pr, const char * key,
|
||||
const char *newValue)
|
||||
{
|
||||
struct ParsedHeader *tmp;
|
||||
tmp = ParsedHeader_get(pr, key);
|
||||
if(tmp != NULL)
|
||||
{
|
||||
if(tmp->valuelen < strlen(newValue)+1)
|
||||
{
|
||||
tmp->valuelen = strlen(newValue)+1;
|
||||
tmp->value = (char *) realloc(tmp->value,
|
||||
tmp->valuelen * sizeof(char));
|
||||
}
|
||||
strcpy(tmp->value, newValue);
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
*/
|
||||
|
||||
/*
|
||||
ParsedHeader Private Methods
|
||||
*/
|
||||
|
||||
void ParsedHeader_create(struct ParsedRequest *pr)
|
||||
{
|
||||
pr->headers =
|
||||
(struct ParsedHeader *)malloc(sizeof(struct ParsedHeader)*DEFAULT_NHDRS);
|
||||
pr->headerslen = DEFAULT_NHDRS;
|
||||
pr->headersused = 0;
|
||||
}
|
||||
|
||||
|
||||
size_t ParsedHeader_lineLen(struct ParsedHeader * ph)
|
||||
{
|
||||
if(ph->key != NULL)
|
||||
{
|
||||
return strlen(ph->key)+strlen(ph->value)+4;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
size_t ParsedHeader_headersLen(struct ParsedRequest *pr)
|
||||
{
|
||||
if (!pr || !pr->buf)
|
||||
return 0;
|
||||
|
||||
size_t i = 0;
|
||||
int len = 0;
|
||||
while(pr->headersused > i)
|
||||
{
|
||||
len += ParsedHeader_lineLen(pr->headers + i);
|
||||
i++;
|
||||
}
|
||||
len += 2;
|
||||
return len;
|
||||
}
|
||||
|
||||
int ParsedHeader_printHeaders(struct ParsedRequest * pr, char * buf,
|
||||
size_t len)
|
||||
{
|
||||
char * current = buf;
|
||||
struct ParsedHeader * ph;
|
||||
size_t i = 0;
|
||||
|
||||
if(len < ParsedHeader_headersLen(pr))
|
||||
{
|
||||
debug("buffer for printing headers too small\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
while(pr->headersused > i)
|
||||
{
|
||||
ph = pr->headers+i;
|
||||
if (ph->key) {
|
||||
memcpy(current, ph->key, strlen(ph->key));
|
||||
memcpy(current+strlen(ph->key), ": ", 2);
|
||||
memcpy(current+strlen(ph->key) +2 , ph->value,
|
||||
strlen(ph->value));
|
||||
memcpy(current+strlen(ph->key) +2+strlen(ph->value) ,
|
||||
"\r\n", 2);
|
||||
current += strlen(ph->key)+strlen(ph->value)+4;
|
||||
}
|
||||
i++;
|
||||
}
|
||||
memcpy(current, "\r\n",2);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void ParsedHeader_destroyOne(struct ParsedHeader * ph)
|
||||
{
|
||||
if(ph->key != NULL)
|
||||
{
|
||||
free(ph->key);
|
||||
ph->key = NULL;
|
||||
free(ph->value);
|
||||
ph->value = NULL;
|
||||
ph->keylen = 0;
|
||||
ph->valuelen = 0;
|
||||
}
|
||||
}
|
||||
|
||||
void ParsedHeader_destroy(struct ParsedRequest * pr)
|
||||
{
|
||||
size_t i = 0;
|
||||
while(pr->headersused > i)
|
||||
{
|
||||
ParsedHeader_destroyOne(pr->headers + i);
|
||||
i++;
|
||||
}
|
||||
pr->headersused = 0;
|
||||
|
||||
free(pr->headers);
|
||||
pr->headerslen = 0;
|
||||
}
|
||||
|
||||
|
||||
int ParsedHeader_parse(struct ParsedRequest * pr, char * line)
|
||||
{
|
||||
char * key;
|
||||
char * value;
|
||||
char * index1;
|
||||
char * index2;
|
||||
|
||||
index1 = index(line, ':');
|
||||
if(index1 == NULL)
|
||||
{
|
||||
debug("No colon found\n");
|
||||
return -1;
|
||||
}
|
||||
key = (char *)malloc((index1-line+1)*sizeof(char));
|
||||
memcpy(key, line, index1-line);
|
||||
key[index1-line]='\0';
|
||||
|
||||
index1 += 2;
|
||||
index2 = strstr(index1, "\r\n");
|
||||
value = (char *) malloc((index2-index1+1)*sizeof(char));
|
||||
memcpy(value, index1, (index2-index1));
|
||||
value[index2-index1] = '\0';
|
||||
|
||||
ParsedHeader_set(pr, key, value);
|
||||
free(key);
|
||||
free(value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
ParsedRequest Public Methods
|
||||
*/
|
||||
|
||||
void ParsedRequest_destroy(struct ParsedRequest *pr)
|
||||
{
|
||||
if(pr->buf != NULL)
|
||||
{
|
||||
free(pr->buf);
|
||||
}
|
||||
if (pr->path != NULL) {
|
||||
free(pr->path);
|
||||
}
|
||||
if(pr->headerslen > 0)
|
||||
{
|
||||
ParsedHeader_destroy(pr);
|
||||
}
|
||||
free(pr);
|
||||
}
|
||||
|
||||
struct ParsedRequest* ParsedRequest_create()
|
||||
{
|
||||
struct ParsedRequest *pr;
|
||||
pr = (struct ParsedRequest *)malloc(sizeof(struct ParsedRequest));
|
||||
if (pr != NULL)
|
||||
{
|
||||
ParsedHeader_create(pr);
|
||||
pr->buf = NULL;
|
||||
pr->method = NULL;
|
||||
pr->protocol = NULL;
|
||||
pr->host = NULL;
|
||||
pr->path = NULL;
|
||||
pr->version = NULL;
|
||||
pr->buf = NULL;
|
||||
pr->buflen = 0;
|
||||
}
|
||||
return pr;
|
||||
}
|
||||
|
||||
/*
|
||||
Recreate the entire buffer from a parsed request object.
|
||||
buf must be allocated
|
||||
*/
|
||||
int ParsedRequest_unparse(struct ParsedRequest *pr, char *buf,
|
||||
size_t buflen)
|
||||
{
|
||||
if (!pr || !pr->buf)
|
||||
return -1;
|
||||
|
||||
size_t tmp;
|
||||
if (ParsedRequest_printRequestLine(pr, buf, buflen, &tmp) < 0)
|
||||
return -1;
|
||||
if (ParsedHeader_printHeaders(pr, buf+tmp, buflen-tmp) < 0)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
Recreate the headers from a parsed request object.
|
||||
buf must be allocated
|
||||
*/
|
||||
int ParsedRequest_unparse_headers(struct ParsedRequest *pr, char *buf,
|
||||
size_t buflen)
|
||||
{
|
||||
if (!pr || !pr->buf)
|
||||
return -1;
|
||||
|
||||
if (ParsedHeader_printHeaders(pr, buf, buflen) < 0)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Size of the headers if unparsed into a string */
|
||||
size_t ParsedRequest_totalLen(struct ParsedRequest *pr)
|
||||
{
|
||||
if (!pr || !pr->buf)
|
||||
return 0;
|
||||
return ParsedRequest_requestLineLen(pr)+ParsedHeader_headersLen(pr);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
Parse request buffer
|
||||
|
||||
Parameters:
|
||||
parse: ptr to a newly created ParsedRequest object
|
||||
buf: ptr to the buffer containing the request (need not be NUL terminated)
|
||||
and the trailing \r\n\r\n
|
||||
buflen: length of the buffer including the trailing \r\n\r\n
|
||||
|
||||
Return values:
|
||||
-1: failure
|
||||
0: success
|
||||
*/
|
||||
int
|
||||
ParsedRequest_parse(struct ParsedRequest * parse, const char *buf,
|
||||
int buflen)
|
||||
{
|
||||
char *full_addr;
|
||||
char *saveptr;
|
||||
char *index;
|
||||
char *currentHeader;
|
||||
|
||||
if (parse->buf != NULL) {
|
||||
debug("parse object already assigned to a request\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (buflen < MIN_REQ_LEN || buflen > MAX_REQ_LEN) {
|
||||
debug("invalid buflen %d", buflen);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Create NUL terminated tmp buffer */
|
||||
char *tmp_buf = (char *)malloc(buflen + 1); /* including NUL */
|
||||
memcpy(tmp_buf, buf, buflen);
|
||||
tmp_buf[buflen] = '\0';
|
||||
|
||||
index = strstr(tmp_buf, "\r\n\r\n");
|
||||
if (index == NULL) {
|
||||
debug("invalid request line, no end of header\n");
|
||||
free(tmp_buf);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Copy request line into parse->buf */
|
||||
index = strstr(tmp_buf, "\r\n");
|
||||
if (parse->buf == NULL) {
|
||||
parse->buf = (char *) malloc((index-tmp_buf)+1);
|
||||
parse->buflen = (index-tmp_buf)+1;
|
||||
}
|
||||
memcpy(parse->buf, tmp_buf, index-tmp_buf);
|
||||
parse->buf[index-tmp_buf] = '\0';
|
||||
|
||||
/* Parse request line */
|
||||
parse->method = strtok_r(parse->buf, " ", &saveptr);
|
||||
if (parse->method == NULL) {
|
||||
debug( "invalid request line, no whitespace\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
if (strcmp (parse->method, "GET")) {
|
||||
debug( "invalid request line, method not 'GET': %s\n",
|
||||
parse->method);
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
full_addr = strtok_r(NULL, " ", &saveptr);
|
||||
|
||||
if (full_addr == NULL) {
|
||||
debug( "invalid request line, no full address\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
parse->version = full_addr + strlen(full_addr) + 1;
|
||||
|
||||
if (parse->version == NULL) {
|
||||
debug( "invalid request line, missing version\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
if (strncmp (parse->version, "HTTP/", 5)) {
|
||||
debug( "invalid request line, unsupported version %s\n",
|
||||
parse->version);
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
parse->protocol = strtok_r(full_addr, "://", &saveptr);
|
||||
if (parse->protocol == NULL) {
|
||||
debug( "invalid request line, missing host\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
const char *rem = full_addr + strlen(parse->protocol) + strlen("://");
|
||||
size_t abs_uri_len = strlen(rem);
|
||||
|
||||
parse->host = strtok_r(NULL, "/", &saveptr);
|
||||
if (parse->host == NULL) {
|
||||
debug( "invalid request line, missing host\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (strlen(parse->host) == abs_uri_len) {
|
||||
debug("invalid request line, missing absolute path\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
parse->path = strtok_r(NULL, " ", &saveptr);
|
||||
if (parse->path == NULL) { // replace empty abs_path with "/"
|
||||
int rlen = strlen(root_abs_path);
|
||||
parse->path = (char *)malloc(rlen + 1);
|
||||
strncpy(parse->path, root_abs_path, rlen + 1);
|
||||
} else if (strncmp(parse->path, root_abs_path, strlen(root_abs_path)) == 0) {
|
||||
debug("invalid request line, path cannot begin "
|
||||
"with two slash characters\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
parse->buf = NULL;
|
||||
parse->path = NULL;
|
||||
return -1;
|
||||
} else {
|
||||
// copy parse->path, prefix with a slash
|
||||
char *tmp_path = parse->path;
|
||||
int rlen = strlen(root_abs_path);
|
||||
int plen = strlen(parse->path);
|
||||
parse->path = (char *)malloc(rlen + plen + 1);
|
||||
strncpy(parse->path, root_abs_path, rlen);
|
||||
strncpy(parse->path + rlen, tmp_path, plen + 1);
|
||||
}
|
||||
|
||||
parse->host = strtok_r(parse->host, ":", &saveptr);
|
||||
parse->port = strtok_r(NULL, "/", &saveptr);
|
||||
|
||||
if (parse->host == NULL) {
|
||||
debug( "invalid request line, missing host\n");
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
free(parse->path);
|
||||
parse->buf = NULL;
|
||||
parse->path = NULL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (parse->port != NULL) {
|
||||
int port = strtol (parse->port, (char **)NULL, 10);
|
||||
if (port == 0 && errno == EINVAL) {
|
||||
debug("invalid request line, bad port: %s\n", parse->port);
|
||||
free(tmp_buf);
|
||||
free(parse->buf);
|
||||
free(parse->path);
|
||||
parse->buf = NULL;
|
||||
parse->path = NULL;
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/* Parse headers */
|
||||
int ret = 0;
|
||||
currentHeader = strstr(tmp_buf, "\r\n")+2;
|
||||
while (currentHeader[0] != '\0' &&
|
||||
!(currentHeader[0] == '\r' && currentHeader[1] == '\n')) {
|
||||
|
||||
//debug("line %s %s", parse->version, currentHeader);
|
||||
|
||||
if (ParsedHeader_parse(parse, currentHeader)) {
|
||||
ret = -1;
|
||||
break;
|
||||
}
|
||||
|
||||
currentHeader = strstr(currentHeader, "\r\n");
|
||||
if (currentHeader == NULL || strlen (currentHeader) < 2)
|
||||
break;
|
||||
|
||||
currentHeader += 2;
|
||||
}
|
||||
free(tmp_buf);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
ParsedRequest Private Methods
|
||||
*/
|
||||
|
||||
size_t ParsedRequest_requestLineLen(struct ParsedRequest *pr)
|
||||
{
|
||||
if (!pr || !pr->buf)
|
||||
return 0;
|
||||
|
||||
size_t len =
|
||||
strlen(pr->method) + 1 + strlen(pr->protocol) + 3 +
|
||||
strlen(pr->host) + 1 + strlen(pr->version) + 2;
|
||||
if(pr->port != NULL)
|
||||
{
|
||||
len += strlen(pr->port)+1;
|
||||
}
|
||||
/* path is at least a slash */
|
||||
len += strlen(pr->path);
|
||||
return len;
|
||||
}
|
||||
|
||||
int ParsedRequest_printRequestLine(struct ParsedRequest *pr,
|
||||
char * buf, size_t buflen,
|
||||
size_t *tmp)
|
||||
{
|
||||
char * current = buf;
|
||||
|
||||
if(buflen < ParsedRequest_requestLineLen(pr))
|
||||
{
|
||||
debug("not enough memory for first line\n");
|
||||
return -1;
|
||||
}
|
||||
memcpy(current, pr->method, strlen(pr->method));
|
||||
current += strlen(pr->method);
|
||||
current[0] = ' ';
|
||||
current += 1;
|
||||
|
||||
memcpy(current, pr->protocol, strlen(pr->protocol));
|
||||
current += strlen(pr->protocol);
|
||||
memcpy(current, "://", 3);
|
||||
current += 3;
|
||||
memcpy(current, pr->host, strlen(pr->host));
|
||||
current += strlen(pr->host);
|
||||
if(pr->port != NULL)
|
||||
{
|
||||
current[0] = ':';
|
||||
current += 1;
|
||||
memcpy(current, pr->port, strlen(pr->port));
|
||||
current += strlen(pr->port);
|
||||
}
|
||||
/* path is at least a slash */
|
||||
memcpy(current, pr->path, strlen(pr->path));
|
||||
current += strlen(pr->path);
|
||||
|
||||
current[0] = ' ';
|
||||
current += 1;
|
||||
|
||||
memcpy(current, pr->version, strlen(pr->version));
|
||||
current += strlen(pr->version);
|
||||
memcpy(current, "\r\n", 2);
|
||||
current +=2;
|
||||
*tmp = current-buf;
|
||||
return 0;
|
||||
}
|
||||
|
||||
138
proxy_parse.h
138
proxy_parse.h
|
|
@ -1,138 +0,0 @@
|
|||
/*
|
||||
* proxy_parse.h -- a HTTP Request Parsing Library.
|
||||
*
|
||||
* Written by: Matvey Arye
|
||||
* For: COS 518
|
||||
*
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <stdarg.h>
|
||||
#include <errno.h>
|
||||
|
||||
#include <ctype.h>
|
||||
|
||||
#ifndef PROXY_PARSE
|
||||
#define PROXY_PARSE
|
||||
|
||||
#define DEBUG 1
|
||||
|
||||
/*
|
||||
ParsedRequest objects are created from parsing a buffer containing a HTTP
|
||||
request. The request buffer consists of a request line followed by a number
|
||||
of headers. Request line fields such as method, protocol etc. are stored
|
||||
explicitly. Headers such as 'Content-Length' and their values are maintained
|
||||
in a linked list. Each node in this list is a ParsedHeader and contains a
|
||||
key-value pair.
|
||||
|
||||
The buf and buflen fields are used internally to maintain the parsed request
|
||||
line.
|
||||
*/
|
||||
struct ParsedRequest {
|
||||
char *method;
|
||||
char *protocol;
|
||||
char *host;
|
||||
char *port;
|
||||
char *path;
|
||||
char *version;
|
||||
char *buf;
|
||||
size_t buflen;
|
||||
struct ParsedHeader *headers;
|
||||
size_t headersused;
|
||||
size_t headerslen;
|
||||
};
|
||||
|
||||
/*
|
||||
ParsedHeader: any header after the request line is a key-value pair with the
|
||||
format "key:value\r\n" and is maintained in the ParsedHeader linked list
|
||||
within ParsedRequest
|
||||
*/
|
||||
struct ParsedHeader {
|
||||
char * key;
|
||||
size_t keylen;
|
||||
char * value;
|
||||
size_t valuelen;
|
||||
};
|
||||
|
||||
|
||||
/* Create an empty parsing object to be used exactly once for parsing a single
|
||||
* request buffer */
|
||||
struct ParsedRequest* ParsedRequest_create();
|
||||
|
||||
/* Parse the request buffer in buf given that buf is of length buflen */
|
||||
int ParsedRequest_parse(struct ParsedRequest * parse, const char *buf,
|
||||
int buflen);
|
||||
|
||||
/* Destroy the parsing object. */
|
||||
void ParsedRequest_destroy(struct ParsedRequest *pr);
|
||||
|
||||
/*
|
||||
Retrieve the entire buffer from a parsed request object. buf must be an
|
||||
allocated buffer of size buflen, with enough space to write the request
|
||||
line, headers and the trailing \r\n. buf will not be NUL terminated by
|
||||
unparse().
|
||||
*/
|
||||
int ParsedRequest_unparse(struct ParsedRequest *pr, char *buf,
|
||||
size_t buflen);
|
||||
|
||||
/*
|
||||
Retrieve the entire buffer with the exception of request line from a parsed
|
||||
request object. buf must be an allocated buffer of size buflen, with enough
|
||||
space to write the headers and the trailing \r\n. buf will not be NUL
|
||||
terminated by unparse(). If there are no headers, the trailing \r\n is
|
||||
unparsed.
|
||||
*/
|
||||
int ParsedRequest_unparse_headers(struct ParsedRequest *pr, char *buf,
|
||||
size_t buflen);
|
||||
|
||||
/* Total length including request line, headers and the trailing \r\n*/
|
||||
size_t ParsedRequest_totalLen(struct ParsedRequest *pr);
|
||||
|
||||
/* Length including headers, if any, and the trailing \r\n but excluding the
|
||||
* request line.
|
||||
*/
|
||||
size_t ParsedHeader_headersLen(struct ParsedRequest *pr);
|
||||
|
||||
/* Set, get, and remove null-terminated header keys and values */
|
||||
int ParsedHeader_set(struct ParsedRequest *pr, const char * key,
|
||||
const char * value);
|
||||
struct ParsedHeader* ParsedHeader_get(struct ParsedRequest *pr,
|
||||
const char * key);
|
||||
int ParsedHeader_remove (struct ParsedRequest *pr, const char * key);
|
||||
|
||||
/* debug() prints out debugging info if DEBUG is set to 1 */
|
||||
void debug(const char * format, ...);
|
||||
|
||||
/* Example usage:
|
||||
|
||||
const char *c =
|
||||
"GET http://www.google.com:80/index.html/ HTTP/1.0\r\nContent-Length:"
|
||||
" 80\r\nIf-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT\r\n\r\n";
|
||||
|
||||
int len = strlen(c);
|
||||
if (ParsedRequest_parse(req, c, len) < 0) {
|
||||
printf("parse failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
printf("Method:%s\n", req->method);
|
||||
printf("Host:%s\n", req->host);
|
||||
|
||||
int rlen = ParsedRequest_totalLen(req);
|
||||
char *b = (char *)malloc(rlen+1);
|
||||
if (ParsedRequest_unparse(req, b, rlen) < 0) {
|
||||
printf("unparse failed\n");
|
||||
return -1;
|
||||
}
|
||||
b[rlen]='\0';
|
||||
|
||||
struct ParsedHeader *r = ParsedHeader_get(req, "If-Modified-Since");
|
||||
printf("Modified value: %s\n", r->value);
|
||||
|
||||
ParsedRequest_destroy(req);
|
||||
*/
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user