logic: add parsing of headers

proxy.c

@@ -4,19 +4,12 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
 #include <netdb.h>
 #include <regex.h>
 #include "structs.h"
 
-#define PROXY_PORT 2020
-#define PROXY_CONN 20
-#define PROXY_MAX_MSGLEN 10*1024
-#define TITLE_DELIM " "
-
-#define REGEX_MATCHN 4
-#define REGEX_TITLE "^([A-Z]+)[ ]+([a-zA-Z0-9\\:\\/\\_\\-\\.\\,]+)[ ]+([a-zA-Z0-9\\_\\-\\.\\,\\/]+)[ ]*[$\n\r]"
-#define REGEX_HEADER "^(.*)[$\\n\\r]"
-
 struct http_msg *child_msg;
 regex_t preg; 
 regmatch_t pmatch[REGEX_MATCHN];
@@ -34,7 +27,43 @@ _return:
 }
 
 int parse_header(char *msgbuff) {
+    int ret; 
+
+    ret = regcomp(&preg, REGEX_HEADER, REG_EXTENDED);
+    if (ret != 0) 
+        goto _err; 
+
+    ret = regexec(&preg, msgbuff, REGEX_MATCHN, pmatch, 0); 
+    if (ret != 0) 
+        goto _err; 
+
+    char *key = extractsub(msgbuff, pmatch[1]);
+    if (key == NULL) 
+        goto _err; 
+
+    char *value = extractsub(msgbuff, pmatch[2]);
+    if (value == NULL) 
+        goto _err;
+
+    struct header new_header = {
+        .key = key,
+        .value = value
+    };
+
+    int last_index = child_msg->header_num;
+
+    child_msg->header_num++;
+    child_msg->headers = (void *) realloc(child_msg->headers,
+            child_msg->header_num*sizeof(struct header));
+
+    child_msg->headers[last_index] = new_header;
+
+    regfree(&preg);
     return 0;
+
+_err: 
+    regfree(&preg);
+    return -1; 
 }
 
 int parse_title(char *msgbuff) {
@@ -60,20 +89,15 @@ int parse_title(char *msgbuff) {
     if (child_msg->ver == NULL)
         goto _err;
 
-    goto _ok;
+    regfree(&preg);
+    return 0;
 
 _err: 
     regfree(&preg);
     return -1; 
 
-_ok:
-    regfree(&preg);
-    return 0;
-
 }
 
-int par_line = 0; 
-
 int parse_line(char *line, int line_count) {
     int ret = 0; 
 
@@ -86,13 +110,24 @@ int parse_line(char *line, int line_count) {
     return ret;
 }
 
+int test(char *line, int num) {
+    fprintf(stdout, "line %s and num %d\n", line, num);
+    return 0;
+}
+
+int par_line = 0; 
+
 void handle_request(int sockfd) {
     int ret;
     int id = getpid();
-    char msgbuff[PROXY_MAX_MSGLEN]; 
+
-    memset(msgbuff, 0, sizeof(msgbuff));
+    char *msgbuff = (char *) calloc(1, PROXY_MAX_MSGLEN);
+    if (msgbuff == NULL) {
+        fprintf(stderr, "Not enough dynamic memory\n");
+        goto end_sock;
+    }
     
-    ret = recv(sockfd, msgbuff, sizeof(msgbuff), 0);
+    ret = recv(sockfd, msgbuff, PROXY_MAX_MSGLEN, 0);
     if (ret < 0) {
         fprintf(stderr, "[CHILD %d] Failed to receive data from client\n", id);
         goto end_sock; 
@@ -103,84 +138,170 @@ void handle_request(int sockfd) {
     // prepare structs 
     child_msg = (struct http_msg *) calloc(1, sizeof(struct http_msg));
     if (child_msg == NULL) {
-        fprintf(stderr, "[CHILD %d] Failed to allocate memory for client structs\n", id);
+        fprintf(stderr, "[CHILD %d] Failed to allocate memory for client"
+                        "structs\n", id);
         goto end_sock; 
     }
 
-    for (char *ln = strtok(msgbuff, "\n"); ln != NULL; ln = strtok(NULL, "\n"), par_line++) {
+    char *ln = strdup(msgbuff); 
-        parse_line(ln, par_line);
+    if (!ln) {
+        fprintf(stdout, "Not enough dynamic memory\n");
+        goto end_sock; 
     }
-    
-    // start parsing 
-    /*ret = parse_title(msgbuff); 
-    if (ret < 0) {
-        fprintf(stderr, "[CHILD %d] Failed to parse the title of the request\n", id);
-        goto end_structs; 
-    }*/
 
+    ln = strtok(ln, "\n");
+
+    while (ln) {
+        parse_line(ln, par_line);
+        par_line++; 
+        ln = strtok(NULL, "\n"); 
+    }
+
+    fprintf(stdout, "I am done here.... zzzz \n");
+
+    for (;;);
 
 //end_structs: 
-    free(child_msg);
+    //free(child_msg);
 
 end_sock:
     close(sockfd);
 }
 
-int main(int argc, char *argv[]) {
+void dohelp() {
-	int server_socket; 
+    printf(
-	int ret; 
+        "+====================+\n"
+        "|   HTTP/1.0 PROXY   |\n"
+        "+=====@0xdeadbeer====+\n"
+        "usage:\n"
+        " ./proxy [mode]\n"
+        "mode:\n"
+        " * server -> start listening as proxy\n"
+        " * client -> send test requests to server\n"
+    );
+}
 
-	ret = server_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);	
+int doserver(void) {
+    int ret, server_socket; 
+
+    ret = server_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 	if (ret < 0) {
-		fprintf(stderr, "Failed to create a socket to listen on\n");
+        fprintf(stderr, "Failed to create a socket to listen on\n");
-		return EXIT_FAILURE;
+		return -1;
 	}
 
 	struct sockaddr_in serv_addr; 
+
 	memset(&serv_addr, 0, sizeof(serv_addr));
+
 	serv_addr.sin_family = AF_INET; 
 	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
 	serv_addr.sin_port = htons(PROXY_PORT);
 
-	ret = bind(server_socket, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
+    ret = bind(server_socket, (struct sockaddr *) &serv_addr,
+            sizeof(serv_addr));
 	if (ret < 0) {
 		fprintf(stderr, "Failed to bind to port %d\n", PROXY_PORT);
-		return EXIT_FAILURE;
+		return -1;
 	}
 
 	ret = listen(server_socket, PROXY_CONN); 
 	if (ret < 0) {
-		fprintf(stderr, "Failed to listen on port %d\n", PROXY_PORT);
+        fprintf(stderr, "Failed to listen on port %d\n", PROXY_PORT);
-		return EXIT_FAILURE;
+		return -1;
 	}
 
 	fprintf(stdout, "Listening on port %d\n", PROXY_PORT);
 
 	for (;;) {
 		struct sockaddr_in client_addr; 
-		socklen_t client_addrlen = sizeof(client_addr);	
+        socklen_t client_addrlen = sizeof(client_addr);	
 		int client_socket; 
 
-		ret = client_socket = accept(server_socket, (struct sockaddr *) &client_addr, &client_addrlen);
+        ret = client_socket = accept(server_socket, (struct sockaddr *)
+                &client_addr, &client_addrlen);
 		if (ret < 0) {
-			fprintf(stderr, "Failed to establish socket connection with client\n");	
+            fprintf(stderr, "Failed to establish socket connection with"
-			return EXIT_FAILURE;
+                            "client\n");	
+			return -1;
 		}
 
         ret = fork();
         switch (ret) {
         case -1: 
-            fprintf(stderr, "[CLIENT SOCKET %d] Failed to fork child process to handle the request\n", client_socket);
+            fprintf(stderr, "[CLIENT SOCKET %d] Failed to fork child process to"
-            return EXIT_FAILURE; 
+                            "handle the request\n", client_socket);
+            return -1; 
             break; 
         case 0: 
             handle_request(client_socket);
             break;
         default: 
-            fprintf(stdout, "[PROGRAM] Successfully forked a new child process with PID %d\n", ret);
+            fprintf(stdout, "[PROGRAM] Successfully forked a new child process"
+                            "with PID %d\n", ret);
             break;
         }
 	}
 
-	return EXIT_SUCCESS;
+	return 0;
+}
+
+int doclient(void) {
+    int ret = 0;
+    int client_socket; 
+	struct sockaddr_in serv_addr;
+
+    ret = client_socket = socket(AF_INET, SOCK_STREAM, 0); 
+	if(ret < 0)
+	{
+        fprintf(stderr, "Failed creating socket\n");
+		return -1;
+	}
+
+	memset(&serv_addr, '0', sizeof(serv_addr));
+
+	serv_addr.sin_family = AF_INET;
+	serv_addr.sin_port = htons(PROXY_PORT);
+
+    ret = inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr);
+	if(ret <= 0)
+	{
+        fprintf(stderr, "Inet_pton error\n");
+		return -1;
+	}
+
+    ret = connect(client_socket, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
+	if(ret < 0)
+	{
+        fprintf(stderr, "Failed connecting to remote server\n");
+		return -1;
+	}
+
+    int bytes = 0; 
+    do {
+        bytes += send(client_socket, CLIENT_MESSAGE, sizeof(CLIENT_MESSAGE), 0);
+    } while (bytes != sizeof(CLIENT_MESSAGE));
+
+    fprintf(stdout, "Sent %d bytes to server\n", bytes);
+
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+	int ret; 
+    if (argc != 2) {
+        dohelp();
+        return 0;
+    }
+
+    const char *mode = argv[1]; 
+    ret = strcmp(mode, SERVER_MODE);
+    if (ret == 0)
+        return doserver();
+
+    ret = strcmp(mode, CLIENT_MODE); 
+    if (ret == 0)
+        return doclient();
+
+    fprintf(stderr, "Unknown proxy mode\n");
 }

structs.h

@@ -1,6 +1,23 @@
 #ifndef STRUCTS_H
 #define STRUCTS_H
 
+#define SERVER_MODE "server"
+#define CLIENT_MODE "client"
+
+#define PROXY_PORT 2020
+#define PROXY_CONN 20
+#define PROXY_MAX_MSGLEN 10*1024
+
+#define REGEX_MATCHN 4
+#define REGEX_TITLE "^([A-Z]+)[ ]+([a-zA-Z0-9\\:\\/\\_\\-\\.\\,]+)"\
+                    "[ ]+([a-zA-Z0-9\\_\\-\\.\\,\\/]+)[ ]*$|\n|\r"
+#define REGEX_HEADER "^([a-zA-Z0-9\\-\\_]*):[ \t]+(.*)$|\n|\r"
+
+#define CLIENT_MESSAGE "GET http://google.com/auth HTTP/1.0\n"\
+                       "\n"\
+                       "Host: google.com\n"\
+                       "Authorization: Bearer ffja2439gjawgjgojserg\n"
+
 struct header {
     char *key; 
     char *value; 
@@ -10,6 +27,7 @@ struct http_msg {
     char *method; 
     char *uri; 
     char *ver; 
+    int header_num;
     struct header *headers;
     void *body;
 };