135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comté
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* (Université de Franche-Comté), France.
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*
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* This is the main source file of libowlps-client.
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*/
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#include "owlps-client.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/param.h>
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/*
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* Opens an UDP socket to the server whose IP address is 'dest_ip'
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* and which listens 'dest_port'. The server information is stored
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* into 'server'. The socket will send through the network interface
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* 'iface' if specified (if you want the interface to be selected,
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* automatically, this parameter should be NULL or an empty string).
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*/
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int owl_create_trx_socket(const char *const dest_ip,
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const uint_fast16_t dest_port,
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struct sockaddr_in *const server,
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const char *const iface)
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{
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struct sockaddr_in client ;
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int sockfd = owl_create_udp_trx_socket(dest_ip, dest_port,
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server, &client) ;
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if (sockfd < 0)
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{
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perror("Error! Cannot create UDP sending socket to the aggregation"
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" server") ;
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exit(OWL_ERR_SOCKET_CREATE) ;
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}
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// If we specified an interface name
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if (iface != NULL && iface[0] != '\0')
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owl_use_iface(sockfd, iface) ;
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return sockfd ;
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}
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/* Selects 'iface' as sending interface for the socket 'sockfd'. */
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void owl_use_iface(const int sockfd, const char *const iface)
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{
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#if defined(linux) && defined(__GLIBC__)
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if (setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE, iface,
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strlen(iface) + 1) == -1)
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{
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fprintf(stderr, "Error! Cannot select interface %s to send the"
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" packet: ", iface) ;
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perror("") ;
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fprintf(stderr, "Sending through the default interface.\n") ;
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}
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#else // linux && __GLIBC__
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fprintf(stderr, "Cannot select interface %s to send the packet:"
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" this option is currently Linux and GNU libc-specific.\n"
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"Sending through the default interface.\n", iface) ;
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#endif // linux && __GLIBC__
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}
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/*
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* Transmits a request.
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* No packet will be transmitted if the variable owl_run is (or
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* becomes) false.
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* nb_pkt: number of packets to transmit.
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* delay: delay between two transmissions, in milliseconds.
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*/
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void owl_send_request(const int sockfd,
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const struct sockaddr_in *const server,
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const void *const packet,
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const uint_fast16_t packet_size,
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const uint_fast16_t nb_pkt,
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const uint_fast32_t delay)
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{
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uint_fast16_t i ;
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if (nb_pkt == 0 || !owl_run)
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return ;
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#ifdef DEBUG
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printf("Sent packets: ") ;
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#endif // DEBUG
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// Transmit first packet:
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owl_send_packet(sockfd, server, packet, packet_size) ;
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// Transmit remaining packets (if any):
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for (i = 0 ; i < nb_pkt - 1 ; ++i)
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{
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owl_msleep(delay) ; // Wait during the wanted delay
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if (! owl_run)
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break ;
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owl_send_packet(sockfd, server, packet, packet_size) ;
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}
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#ifdef DEBUG
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putchar('\n') ;
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#endif // DEBUG
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}
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void owl_send_packet(const int sockfd,
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const struct sockaddr_in *const server,
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const void *const packet,
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const uint_fast16_t packet_size)
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{
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ssize_t nsent = sendto(sockfd, packet, packet_size, 0,
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(struct sockaddr *) server,
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(socklen_t) sizeof(*server)) ;
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if (nsent != (ssize_t) packet_size)
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{
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perror("Error sending data to the aggregation server") ;
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exit(OWL_ERR_SOCKET_SEND) ;
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}
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#ifdef DEBUG
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putchar('.') ;
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fflush(stdout) ;
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#endif // DEBUG
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}
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