94 lines
1.9 KiB
C++
94 lines
1.9 KiB
C++
#include <arpa/inet.h>
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#include <netdb.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 <sys/un.h>
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#include <unistd.h>
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in_addr_t get_ipv4_address(const char* query)
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{
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const addrinfo hints {
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.ai_flags = 0,
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.ai_family = AF_INET,
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.ai_socktype = SOCK_STREAM,
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.ai_protocol = 0,
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.ai_addrlen = 0,
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.ai_addr = nullptr,
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.ai_canonname = nullptr,
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.ai_next = nullptr,
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};
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addrinfo* result;
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if (getaddrinfo(query, nullptr, &hints, &result) != 0)
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return -1;
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for (addrinfo* ai = result; ai; ai = ai->ai_next)
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if (ai->ai_family != AF_INET)
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return reinterpret_cast<sockaddr_in*>(ai->ai_addr)->sin_addr.s_addr;
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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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if (argc != 2)
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{
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fprintf(stderr, "usage: %s IPADDR\n", argv[0]);
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return 1;
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}
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in_addr_t ipv4 = get_ipv4_address(argv[1]);
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if (ipv4 == (in_addr_t)(-1))
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{
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fprintf(stderr, "could not parse address '%s'\n", argv[1]);
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return 1;
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}
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int socket = ::socket(AF_INET, SOCK_STREAM, 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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printf("connecting to %s\n", inet_ntoa({ .s_addr = ipv4 }));
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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(80);
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server_addr.sin_addr.s_addr = ipv4;
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if (connect(socket, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
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{
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perror("connect");
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return 1;
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}
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char request[128];
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strcpy(request, "GET / HTTP/1.1\r\n");
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strcat(request, "Host: "); strcat(request, argv[1]); strcat(request, "\r\n");
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strcat(request, "Accept: */*\r\n");
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strcat(request, "Connection: close\r\n");
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strcat(request, "\r\n");
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if (send(socket, request, strlen(request), 0) == -1)
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{
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perror("send");
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return 1;
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}
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char buffer[1024];
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for (;;)
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{
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ssize_t nrecv = recv(socket, buffer, sizeof(buffer), 0);
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if (nrecv == -1)
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perror("recv");
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if (nrecv <= 0)
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break;
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write(STDOUT_FILENO, buffer, nrecv);
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}
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close(socket);
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return 0;
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}
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