133 строки
2.9 KiB
C
133 строки
2.9 KiB
C
#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#if EMSCRIPTEN
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#include <emscripten.h>
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#endif
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#define EXPECTED_BYTES 5
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int SocketFD;
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unsigned int get_all_buf(int sock, char* output, unsigned int maxsize)
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{
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int bytes;
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if (ioctl(sock, FIONREAD, &bytes)) return 0;
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if (bytes == 0) return 0;
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char buffer[1024];
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int n;
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unsigned int offset = 0;
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while((errno = 0, (n = recv(sock, buffer, sizeof(buffer), 0))>0) ||
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errno == EINTR) {
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if(n>0)
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{
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if (((unsigned int) n)+offset > maxsize) { fprintf(stderr, "too much data!"); exit(EXIT_FAILURE); }
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memcpy(output+offset, buffer, n);
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offset += n;
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}
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}
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if(n < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
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fprintf(stderr, "error in get_all_buf!");
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exit(EXIT_FAILURE);
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}
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return offset;
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}
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int done = 0;
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void iter() {
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/* perform read write operations ... */
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static char out[1024*2];
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static int pos = 0;
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int n = get_all_buf(SocketFD, out+pos, 1024-pos);
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if (n) printf("read! %d\n", n);
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pos += n;
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if (pos >= EXPECTED_BYTES) {
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int i, sum = 0;
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for (i=0; i < pos; i++) {
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printf("%x\n", out[i]);
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sum += out[i];
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}
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shutdown(SocketFD, SHUT_RDWR);
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close(SocketFD);
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done = 1;
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printf("sum: %d\n", sum);
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#if EMSCRIPTEN
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int result = sum;
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REPORT_RESULT();
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#endif
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}
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}
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int main(void)
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{
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struct sockaddr_in stSockAddr;
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int Res;
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SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (-1 == SocketFD)
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{
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perror("cannot create socket");
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exit(EXIT_FAILURE);
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}
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memset(&stSockAddr, 0, sizeof(stSockAddr));
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stSockAddr.sin_family = AF_INET;
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stSockAddr.sin_port = htons(7001);
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struct hostent *host0 = gethostbyname("test.com"); // increment hostname counter to check for possible but at 0,0 not differentiating low/high
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struct hostent *host = gethostbyname("localhost");
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char **addr_list = host->h_addr_list;
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int *addr = (int*)*addr_list;
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printf("raw addr: %d\n", *addr);
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char name[INET_ADDRSTRLEN];
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if (!inet_ntop(AF_INET, addr, name, sizeof(name))) {
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printf("could not figure out name\n");
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return 0;
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}
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printf("localhost has 'ip' of %s\n", name);
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Res = inet_pton(AF_INET, name, &stSockAddr.sin_addr);
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if (0 > Res) {
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perror("error: first parameter is not a valid address family");
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close(SocketFD);
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exit(EXIT_FAILURE);
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} else if (0 == Res) {
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perror("char string (second parameter does not contain valid ipaddress)");
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close(SocketFD);
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exit(EXIT_FAILURE);
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}
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if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(stSockAddr))) {
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perror("connect failed");
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close(SocketFD);
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exit(EXIT_FAILURE);
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}
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#if EMSCRIPTEN
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emscripten_set_main_loop(iter, 0, 0);
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#else
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while (!done) iter();
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#endif
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return EXIT_SUCCESS;
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}
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