geth ipc connection

geth-ipc.c

/**
 * geth ipc connection
 * @author Jack Peterson ([email protected])
 */
#include <stdio.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <string.h>

const char IPC_PATH[] = "/home/jack/.ethereum/geth.ipc";

int main(void)
{
    int sockfd, nbytes;
    char buf[256];
    struct sockaddr_un addr;

    if ( (sockfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
        puts("socket() failed");
        return 1;
    }

    bzero(&addr, sizeof(struct sockaddr_un));

    addr.sun_family = AF_UNIX;
    snprintf(addr.sun_path, sizeof(addr.sun_path), IPC_PATH);

    if (connect(sockfd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) != 0) {
        puts("connect() failed");
        return 1;
    }

    nbytes = snprintf(buf, 256, "{\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"eth_coinbase\",\"params\":[]}");
    if (!write(sockfd, buf, nbytes)) {
        puts("write() failed");
    }

    nbytes = read(sockfd, buf, 256);
    buf[nbytes] = 0;

    printf("geth says: %s\n", buf);

    close(sockfd);

    return 0;
}