get-ip

commit a156f8f78931811309ed7fdeb1d165eed3814222
Author: Harridrone <harrison_k_a@hotmail.com>
Date:   Tue, 23 Mar 2021 11:38:50 -0400

get-ip public ip utility

Diffstat:
A
.gitignore
 | 
1
+
A
README.md
 | 
10
++++++++++
A
main.c
 | 
78
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
makefile
 | 
9
+++++++++

4 files changed, 98 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+get-ip
diff --git a/README.md b/README.md
@@ -0,0 +1,10 @@
+## get-ip
+
+Very simple c utility to get your public ip address from command line, useful for when you are hosting a game server
+
+## Dependencies
+You just need libcurl-dev installed on your machine and it should work fine, if you are using a different compiler than clang, just modify the makefile.
+
+## Installation
+
+To install it into /usr/local/bin for use on the command just run "make install" as sudo
diff --git a/main.c b/main.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <curl/curl.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct s_result {
+	char* data;
+	unsigned int size;
+} s_result;
+
+static unsigned int save_to_char(void *contents, unsigned int size, unsigned int nmemb, void* usr_dta){
+	unsigned int full_size;
+	struct s_result* tmp_result = (struct s_result*)usr_dta;
+	char* ralc_ptr;
+
+	full_size = size*nmemb;
+
+	ralc_ptr = realloc(tmp_result->data, tmp_result->size + full_size + 1);
+
+	if(!ralc_ptr){
+		printf("frenchman >> out of memory\n");
+		return 0;
+	}
+
+	tmp_result->data = ralc_ptr;
+	memcpy(&(tmp_result->data[tmp_result->size]), contents, full_size);
+	tmp_result->size += full_size;
+	tmp_result->data[tmp_result->size] = 0;
+
+	return full_size;
+}
+
+CURL*               g_curl;
+struct s_result     result;
+CURLcode            res;
+
+/*The number of bytes after which we see the actual IP*/
+#define PREFIX_OFFSET 5
+
+int main(int argc, char** argv){
+	char ip_addr[24];
+	int i = 0;
+
+	memset(ip_addr,'\0',24);
+
+	g_curl = curl_easy_init();
+	
+	if(!g_curl){
+		printf("Failed to init curl\n");
+		return -1;
+	}
+
+	curl_easy_setopt(g_curl, CURLOPT_URL, "http://ip4only.me/api/");
+	curl_easy_setopt(g_curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
+	curl_easy_setopt(g_curl, CURLOPT_WRITEFUNCTION, save_to_char);
+	curl_easy_setopt(g_curl, CURLOPT_WRITEDATA, (void *)&result);
+
+	res = curl_easy_perform(g_curl);
+
+	for(i = 0;i<15;++i){
+
+		if(result.data[i+PREFIX_OFFSET] == ',')
+			break;
+
+		ip_addr[i] = result.data[i+PREFIX_OFFSET];
+		
+	}
+
+	if(argc >= 2){
+		if(strcmp(argv[1],"-q") == 0){
+			printf("%s",ip_addr);
+			return 0;
+		}
+	}		
+
+	printf("\n\tYour public IPV4 Address: %s\n\n",ip_addr);
+	return 0;
+}
diff --git a/makefile b/makefile
@@ -0,0 +1,9 @@
+
+CC = clang
+LIBS = -lcurl
+
+get-ip: main.c
+	$(CC) -std=c89 -Wall -o get-ip main.c $(LIBS)
+
+install: get-ip
+	cp ./get-ip /usr/local/bin