89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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int usage(const char* argv0)
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{
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fprintf(stderr, "usage: %s [-s|-c] [-a addr] [-p port]\n", argv0);
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return 1;
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}
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int main(int argc, char** argv)
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{
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bool server = false;
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uint32_t addr = 0;
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uint16_t port = 0;
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for (int i = 1; i < argc; i++)
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{
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if (strcmp(argv[i], "-s") == 0)
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server = true;
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else if (strcmp(argv[i], "-c") == 0)
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server = false;
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else if (strcmp(argv[i], "-a") == 0)
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addr = inet_addr(argv[++i]);
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else if (strcmp(argv[i], "-p") == 0)
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sscanf(argv[++i], "%hu", &port);
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else
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return usage(argv[0]);
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}
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int socket = ::socket(AF_INET, SOCK_DGRAM, 0);
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if (socket == -1)
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{
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perror("socket");
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return 1;
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}
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if (server)
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{
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sockaddr_in bind_addr;
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bind_addr.sin_family = AF_INET;
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bind_addr.sin_port = htons(port);
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bind_addr.sin_addr.s_addr = addr;
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if (bind(socket, (sockaddr*)&bind_addr, sizeof(bind_addr)) == -1)
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{
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perror("bind");
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return 1;
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}
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printf("listening on %s:%hu\n", inet_ntoa(bind_addr.sin_addr), ntohs(bind_addr.sin_port));
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char buffer[1024];
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sockaddr_in sender;
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socklen_t sender_len = sizeof(sender);
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if (recvfrom(socket, buffer, sizeof(buffer), 0, (sockaddr*)&sender, &sender_len) == -1)
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{
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perror("recvfrom");
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return 1;
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}
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printf("received from %s:%hu\n", inet_ntoa(sender.sin_addr), ntohs(sender.sin_port));
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printf(" %s\n", buffer);
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}
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else
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{
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const char buffer[] = "Hello from banan-os!";
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sockaddr_in server_addr;
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(port);
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server_addr.sin_addr.s_addr = addr;
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printf("sending to %s:%hu\n", inet_ntoa(server_addr.sin_addr), ntohs(server_addr.sin_port));
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if (sendto(socket, buffer, sizeof(buffer), 0, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
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{
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perror("sendto");
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return 1;
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}
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}
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close(socket);
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return 0;
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}
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