142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
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* Initial commit by Yibo @ Jul. 28, 2015
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* Last update by Yanzi @ Sept. 27, 2016
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*/
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#include <stdio.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <linux/if_packet.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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#include <sys/sendfile.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#define BUF_SIZ 65536
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int main(int argc, char *argv[])
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{
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// defaults
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uint total_bytes_recv = 0;
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// for timing
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double elapsedTime;
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struct timeval t_start, t_end;
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// for socket
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int fd = 0; // file descriptor of file to write (receive)
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int port;
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int recvsize = 4096;
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int listenfd; // fd
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char recvbuf[BUF_SIZ];
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struct sockaddr_in servaddr, cliaddr;
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socklen_t clilen;
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// for misc
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int ret;
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unsigned char listenOnce = 0;
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signal(SIGPIPE, SIG_IGN);
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if (argc < 2)
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{
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printf("Usage: %s <port> <[optional] listenOnce ([0]/1)> <[optional] filepath>\n", argv[0]);
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exit(0);
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}
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port = atoi(argv[1]);
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if (argc > 2)
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listenOnce = atoi(argv[2]);
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// listen to socket
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listenfd = socket(AF_INET, SOCK_DGRAM, 0);
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// bind socket and listen
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servaddr.sin_port = htons(port);
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bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
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// infinity loop to listen
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for (;;)
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{
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printf("Waiting on port %d...\n", port);
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// clear total_bytes_recv to 0
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total_bytes_recv = 0;
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// if instrument to write to a file
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if (argc > 3)
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{
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fd = open(argv[3], O_WRONLY | O_CREAT | O_TRUNC);
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if (fd == -1) {
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fprintf(stderr, "! Unable to open file %s.\n", argv[3]);
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close(listenfd);
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if (listenOnce)
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break;
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continue;
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}
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}
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// start timing
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gettimeofday(&t_start, NULL);
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// start receiving
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for (;;)
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{
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clilen = sizeof(cliaddr);
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// wait for one client and accept it once found
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ret = recvfrom(listenfd, recvbuf, recvsize, 0, (struct sockaddr *)&cliaddr, &clilen);
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printf("Accepted client at %s with %d len msg\n", inet_ntoa(cliaddr.sin_addr), ret);
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if (ret <= 0)
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{
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if (errno == 0)
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break;
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fprintf(stderr, "! Fail to recv: ret:%d, err:%d; quiting..\n", ret, errno);
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exit(1);
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}
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// a "code" to indicate UDP is done
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// printf("%d %d %d", (recvbuf[0] == '='), (recvbuf[1] == '?'), (recvbuf[0] == '!'));
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if ((recvbuf[0] == '=') && (recvbuf[1] == '?') && (recvbuf[2] == '!'))
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{
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if (argc > 3)
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close(fd);
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break;
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}
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if (argc > 3)
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write(fd, recvbuf, ret);
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total_bytes_recv += ret;
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// printf("total_bytes_recv %d\n", total_bytes_recv);
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}
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// end timing
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gettimeofday(&t_end, NULL);
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elapsedTime = (t_end.tv_sec - t_start.tv_sec) + (t_end.tv_usec - t_start.tv_usec) / 1000000.0;
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printf(
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"recv(bytes):%d\nduration(s):%lf\nthroughput(bps):%lf\n",
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total_bytes_recv, elapsedTime, total_bytes_recv * 8 / elapsedTime);
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if (listenOnce)
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break;
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}
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close(listenfd);
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return 0;
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}
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