Revision 4c2e6802
| util/udpSocket.c | ||
|---|---|---|
| 48 | 48 |
#include <sys/socket.h> |
| 49 | 49 |
#include <linux/types.h> |
| 50 | 50 |
#include <linux/errqueue.h> |
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#ifdef __linux__ |
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#include <linux/if.h> |
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#include <ifaddrs.h> |
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#endif |
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|
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#include <errno.h> |
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#include <string.h> |
| ... | ... | |
| 89 | 93 |
//This is debug code that checks if the socket was created |
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if (udpSocket == -1) |
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{
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fprintf(stderr, "Could not create a socket!\n");
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fatal("Could not create an UDP socket!");
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exit(1); |
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} |
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else |
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{
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if(verbose == 1){
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printf("Socket created.\n" );
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} |
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} |
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|
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/* sets the standard server address and port */ |
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udpsrc.sin_family = AF_INET; |
| ... | ... | |
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returnStatus = bind(udpSocket,(struct sockaddr *)&udpsrc,sizeof(udpsrc)); |
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|
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/* This is debug code */ |
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if (returnStatus == 0) {
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if(verbose == 1){
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fprintf(stderr, "SocketID bind completed!\n"); |
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} |
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} |
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else{
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fprintf(stderr, "Could not bind socketID to address!\n"); |
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close(udpSocket); |
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exit(1); |
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if (returnStatus) {
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fatal("Could not bind socketID to address!");
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} |
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#ifdef IP_MTU_DISCOVER |
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|
| ... | ... | |
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* This sets the DON'T FRAGMENT bit on the IP HEADER |
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*/ |
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if(setsockopt(udpSocket,IPPROTO_IP,IP_MTU_DISCOVER,&pmtuopt ,size) == -1){
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printf("setsockopt: set IP_DONTFRAG did not work. ERRNO %d \n ",errno);
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error("setsockopt: set IP_DONTFRAG did not work. ERRNO %d",errno);
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|
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} |
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|
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/* This option writes the IP_TTL field into ancillary data */ |
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if(setsockopt(udpSocket,IPPROTO_IP, IP_RECVTTL, &yes,size) < 0) |
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{
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printf("setsockopt: cannot set RECV_TTL. ERRNO %d \n",errno);
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error("setsockopt: cannot set RECV_TTL. ERRNO %d",errno);
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} |
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|
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/* This option writes received internal and external(icmp) error messages into ancillary data */ |
| 157 | 147 |
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if(setsockopt(udpSocket,IPPROTO_IP, IP_RECVERR, &yes,size) < 0) |
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{
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printf("setsockopt: cannot set RECV_ERROR. ERRNO %d \n",errno);
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if(setsockopt(udpSocket,IPPROTO_IP, IP_RECVERR, &yes,size) < 0) {
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error("setsockopt: cannot set RECV_ERROR. ERRNO %d",errno);
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| 161 | 150 |
} |
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|
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#endif |
| ... | ... | |
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unsigned int size = sizeof(value); |
| 173 | 162 |
|
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if(getsockopt(udpSocket,SOL_IP,IP_TTL,&value,&size) == -1){
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printf("get TTL did not work \n ");
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error("get TTL did not work");
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return 0; |
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} |
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*ttl = value; |
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if(verbose == 1) |
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printf("TTL is %i \n",value);
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if(verbose == 1) debug("TTL is %i",value);
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return 1; |
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} |
| ... | ... | |
| 224 | 212 |
int handleSocketError(const int udpSocket,const int iofunc,char *buf,int *bufsize,struct sockaddr_in *addr,icmp_error_cb icmpcb_value,int *ttl){
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if(verbose == 1) |
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printf("handle Socket error is called \n");
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if(verbose == 1) debug("handle Socket error is called");
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/* variables */ |
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struct msghdr msgh; |
| ... | ... | |
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return 0; |
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|
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} |
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|
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const char *autodetect_ipaddress() {
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#ifndef __linux__ |
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return NULL; |
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#endif |
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static char addr[128] = ""; |
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FILE *r = fopen("/proc/net/route", "r");
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if (!r) return NULL; |
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char iface[IFNAMSIZ] = ""; |
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char line[128] = "x"; |
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while (1) {
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char dst[32]; |
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char ifc[IFNAMSIZ]; |
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fgets(line, 127, r); |
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if (feof(r)) break; |
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if ((sscanf(line, "%s\t%s", iface, dst) == 2) && !strcpy(dst, "00000000")) {
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strcpy(iface, ifc); |
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break; |
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} |
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} |
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if (iface[0] == 0) return NULL; |
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struct ifaddrs *ifAddrStruct=NULL; |
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if (getifaddrs(&ifAddrStruct)) return NULL; |
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while (ifAddrStruct) {
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if (ifAddrStruct->ifa_addr && ifAddrStruct->ifa_addr->sa_family == AF_INET && |
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ifAddrStruct->ifa_name && !strcmp(ifAddrStruct->ifa_name, iface)) {
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void *tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr; |
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return inet_ntop(AF_INET, tmpAddrPtr, addr, 127); |
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} |
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ifAddrStruct=ifAddrStruct->ifa_next; |
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} |
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return NULL; |
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} |
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