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[arch/linu] udp_socket: possibility to use hostname

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This commit is contained in:
Felix Ruess
2015-03-04 12:10:53 +01:00
parent 31f555ea99
commit 2d3efdb6ee
2 changed files with 29 additions and 4 deletions
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sw/airborne/arch/linux/udp_socket.c
+27 -3
View File
@@ -27,9 +27,11 @@
#include "udp_socket.h" #include "udp_socket.h"
#include <sys/socket.h> #include <sys/socket.h>
#include <arpa/inet.h> #include <arpa/inet.h>
#include <netdb.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <stdio.h> #include <stdio.h>
#include <errno.h> #include <errno.h>
#include <string.h>
//#define TRACE(type,fmt,args...) fprintf(stderr, fmt, args) //#define TRACE(type,fmt,args...) fprintf(stderr, fmt, args)
#define TRACE(type,fmt,args...) #define TRACE(type,fmt,args...)
@@ -42,11 +44,32 @@
* @param[in] port_out output port * @param[in] port_out output port
* @param[in] port_in input port (set to < 0 to disable) * @param[in] port_in input port (set to < 0 to disable)
* @param[in] broadcast if TRUE enable broadcasting * @param[in] broadcast if TRUE enable broadcasting
* @return -1 on error, otherwise 0
*/ */
void udp_socket_create(struct UdpNetwork *network, char *host, int port_out, int port_in, bool_t broadcast) int udp_socket_create(struct UdpNetwork *network, char *host, int port_out, int port_in, bool_t broadcast)
{ {
if (network == NULL) { if (network == NULL) {
return; return -1;
}
/* try to convert host ipv4 address to binary format */
struct in_addr host_ip;
if (!inet_aton(host, &host_ip)) {
/* not an IP address, try to resolve hostname */
struct hostent *hp;
hp = gethostbyname(host);
if (!hp) {
fprintf(stderr, "could not obtain address of %s\n", host);
return -1;
}
/* check if IPv4 address */
if (hp->h_addrtype == AF_INET && hp->h_length == 4) {
/* simply use first address */
memcpy(&host_ip.s_addr, hp->h_addr_list[0], hp->h_length);
}
else {
return -1;
}
} }
// Create the socket with the correct protocl // Create the socket with the correct protocl
@@ -73,7 +96,8 @@ void udp_socket_create(struct UdpNetwork *network, char *host, int port_out, int
// set the output/destination address for use in sendto later // set the output/destination address for use in sendto later
network->addr_out.sin_family = PF_INET; network->addr_out.sin_family = PF_INET;
network->addr_out.sin_port = htons(port_out); network->addr_out.sin_port = htons(port_out);
network->addr_out.sin_addr.s_addr = inet_addr(host); network->addr_out.sin_addr.s_addr = host_ip.s_addr;
return 0;
} }
/** /**
sw/airborne/arch/linux/udp_socket.h
+2 -1
View File
@@ -44,8 +44,9 @@ struct UdpNetwork {
* @param[in] port_out output port * @param[in] port_out output port
* @param[in] port_in input port (set to < 0 to disable) * @param[in] port_in input port (set to < 0 to disable)
* @param[in] broadcast if TRUE enable broadcasting * @param[in] broadcast if TRUE enable broadcasting
* @return -1 on error, otherwise 0
*/ */
extern void udp_socket_create(struct UdpNetwork *network, char *host, int port_out, int port_in, bool_t broadcast); extern int udp_socket_create(struct UdpNetwork *network, char *host, int port_out, int port_in, bool_t broadcast);
/** /**
* Send a packet from buffer, blocking. * Send a packet from buffer, blocking.