imap_idle.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <unistd.h>

#define USERNAME "username"
#define PASSWORD "password"
#define SERVER_URL "imap://mail.example.org/"

static __inline CURLcode send(CURL *curl, const char *cmd) {
	size_t len = 0;
	printf("%s", cmd);
	CURLcode ret = curl_easy_send(curl, cmd, strlen(cmd), &len);
	sleep(1);
	return ret;
}

static __inline void recv(CURL *curl) {
	char buffer[8192];
	size_t len = 0;

	CURLcode ret = CURLE_OK;
	do {
		ret = curl_easy_recv(curl, buffer, sizeof(buffer)-1, &len);
		if( ret == CURLE_OK ) {
			buffer[len] = '\0';
			printf("%s", buffer);
		} else if( ret != CURLE_AGAIN) {
			printf("recv error: %d\n", ret);
		}
	} while(ret == CURLE_OK);
}

int main(void) {
	CURL *curl;
	CURLcode res;

	curl = curl_easy_init();
	if( curl ) {
		curl_easy_setopt(curl, CURLOPT_USERNAME, USERNAME);
		curl_easy_setopt(curl, CURLOPT_PASSWORD, PASSWORD);

		curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
		curl_easy_setopt(curl, CURLOPT_URL, SERVER_URL "INBOX");

		curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
		curl_easy_setopt(curl, CURLOPT_MAXCONNECTS, 1L);

		// Do the request
		res = curl_easy_perform(curl);
		if( res != CURLE_OK ) {
			fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
		}

		send(curl, "A10 SELECT \"INBOX\"\r\n");
		recv(curl);

		send(curl, "A11 IDLE\r\n");
		recv(curl);

		send(curl, "DONE\r\n");

		printf("curl_easy_cleanup\n");
		curl_easy_cleanup(curl);
	}

	return res;
}