#include <unistd.h>
#include <memory.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

const unsigned short TEST_PORT = 40000;

void usage() {
        printf("client [tcp|udp] [4|6] [4|6]\n");
        exit(1);
}

int main(int argc, char *argv[]) {
        int socketType = SOCK_DGRAM;
        int socketFamily1 = AF_INET;
        int socketFamily2 = AF_INET;

        if (argc > 1) {
                if (!strcmp(argv[1], "tcp")) {
                        socketType = SOCK_STREAM;
                } else if (!strcmp(argv[1], "udp")) {
                        socketType = SOCK_DGRAM;
                } else {
                        usage();
                }
        }
        if (argc > 2) {
                switch (atoi(argv[2])) {
                case 4:
                        socketFamily1 = AF_INET;
                        break;
                case 6:
                        socketFamily1 = AF_INET6;
                        break;
                default:
                        usage();
                }
        }
        if (argc > 3) {
                switch (atoi(argv[3])) {
                case 4:
                        socketFamily2 = AF_INET;
                        break;
                case 6:
                        socketFamily2 = AF_INET6;
                        break;
                default:
                        usage();
                }
        }

        int fd = socket(socketFamily1, socketType, 0);
        if (fd < 0) {
                perror("socket");
                return -1;
        }

        sockaddr_storage saddr;
        memset(&saddr, 0, sizeof(saddr));
        saddr.ss_family = socketFamily2;
        ((sockaddr_in *) &saddr)->sin_port = htons(TEST_PORT);
        if (connect(fd, (sockaddr *) &saddr, socketFamily2 == AF_INET ?
                                sizeof(sockaddr_in) : sizeof(sockaddr_in6)) < 0) {
                perror("connect");
                close(fd);
                return -1;
        }

        const char *buffer = "hello world";
        unsigned len = strlen(buffer);
        int ret = send(fd, buffer, len, 0);
        if (ret < len) {
                if (ret < 0) {
                        perror("send");
                } else if (ret == 0) {
                        printf("no data sent!\n");
                } else {
                        printf("not all data sent!\n");
                }
        } else {
                printf("send(): success\n");
        }
        close(fd);
        return 0;
}