148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/*
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* Test name: test04_cli.c
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*
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* Objective: Test a simple UDP client
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*
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* Description: Implements a simple echo client using the UDP protocol. First
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* it waits until it is possible to write (which is always).
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/select.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <net/netlib.h>
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#include <net/gen/netdb.h>
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#include <net/gen/in.h>
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#include <net/gen/udp.h>
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#include <net/gen/udp_hdr.h>
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#include <net/gen/udp_io.h>
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#include <net/hton.h>
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#define PORT 6000L
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/* Type for received data */
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typedef struct
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{
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udp_io_hdr_t header;
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char data[1024];
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} udp_buffer_t;
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int udp_conf(char *host, long port, udp_io_hdr_t *header)
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{
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/* configures UDP connection */
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char *udp_device;
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struct hostent *hp;
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int netfd;
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nwio_udpopt_t udpopt;
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ipaddr_t dirhost;
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int result;
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/* get host address */
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if ((hp = gethostbyname(host)) == (struct hostent*) NULL)
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{
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fprintf(stderr,"Unknown host\n");
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return(-1);
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}
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memcpy((char *)&dirhost, (char *)hp->h_addr, hp->h_length);
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/* Get UDP device */
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if (( udp_device = getenv("UDP_DEVICE") ) == NULL)
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udp_device = UDP_DEVICE;
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/* Get UDP connection */
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if ((netfd = open(udp_device, O_RDWR)) < 0)
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{
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fprintf(stderr,"Error opening UDP device\n");
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return -1;
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}
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/* Configure UDP connection */
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udpopt.nwuo_flags = NWUO_COPY | NWUO_LP_SEL | NWUO_EN_LOC | NWUO_DI_BROAD
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| NWUO_RP_SET | NWUO_RA_SET | NWUO_RWDATALL | NWUO_DI_IPOPT;
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udpopt.nwuo_remaddr = dirhost;
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udpopt.nwuo_remport = (udpport_t) htons(port);
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if ((result = ioctl(netfd, NWIOSUDPOPT, &udpopt) ) <0)
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{
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fprintf(stderr, "Error establishing communication\n");
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printf("Error: %d\n",result);
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close(netfd);
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return -1;
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}
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/* Get configuration for UDP comm */
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if ((result = ioctl(netfd, NWIOGUDPOPT, &udpopt) ) < 0)
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{
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fprintf(stderr,"Error getting configuration\n");
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printf("Error: %d\n", result);
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close(netfd);
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return -1;
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}
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header->uih_src_addr = udpopt.nwuo_locaddr;
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header->uih_dst_addr = udpopt.nwuo_remaddr;
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header->uih_src_port = udpopt.nwuo_locport;
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header->uih_dst_port = udpopt.nwuo_remport;
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return netfd;
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}
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int main(int argc,char *argv[]) {
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int fd;
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ssize_t data_read;
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udp_buffer_t buffer_send, buffer_rec;
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fd_set fds_write;
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int ret;
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/* Check parameters */
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if (argc !=2) {
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fprintf(stderr,"Usage: %s host\n", argv[0]);
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exit(-1);
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}
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if ((fd = udp_conf(argv[1], PORT, &buffer_send.header) ) < 0)
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exit(-1);
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/* init fd_set */
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FD_ZERO(&fds_write);
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FD_SET(fd, &fds_write);
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while (1)
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{
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/* Wait until it is possible to write with select */
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ret = select(4, NULL, &fds_write, NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Error on select waiting for write: %d\n", errno);
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exit(-1);
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}
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if (!FD_ISSET(fd, &fds_write)) {
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fprintf(stderr, "Error: The net connection is not ready for writing (?)\n");
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exit(-1);
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}
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/* Get a string and send it */
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printf("Ready to write...\n");
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printf("Send data: ");
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gets(buffer_send.data);
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write(fd, &buffer_send, sizeof(udp_buffer_t));
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/* If data sent is exit then break */
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if (!strcmp(buffer_send.data,"exit"))
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break;
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/* Get server response */
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data_read = read(fd, &buffer_rec, sizeof(udp_buffer_t));
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printf("Received: %s\n\n", buffer_rec.data);
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}
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/* Close UDP communication */
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close(fd);
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}
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