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https://github.com/markqvist/tncattach.git
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TAP
- Added initial code that I have been working on
This commit is contained in:
Tristan Brice Velloza Kildaire
parent
20ad1d2553
commit
6b85134c53
214
TAP.c
214
TAP.c
@ -1,19 +1,160 @@
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#include "TAP.h"
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// Needed for in6_ifreq
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// #include <cstdio>
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// #include <cstdlib>
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#include <linux/ipv6.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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char tap_name[IFNAMSIZ];
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extern bool verbose;
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extern bool noipv6;
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extern bool set_ipv4;
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extern bool set_ipv6;
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extern bool set_netmask;
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extern bool noup;
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extern int mtu;
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extern int device_type;
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extern char if_name[IFNAMSIZ];
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extern char* ipv4_addr;
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extern char* ipv6_addr;
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extern char* netmask;
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extern void cleanup();
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// TODO: Allow optional-arg for case where we must also generate the hwaddr
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// (this would be the case whereby we are running without `--ethernet`)
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struct in6_addr generateLinkLocal(char* interfaceName)
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{
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struct in6_addr ll_a;
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memset(&ll_a, 0, sizeof(struct in6_addr));
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ll_a.s6_addr[0] = 0xfe;
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ll_a.s6_addr[1] = 0x80;
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// TODO: Set the rest here
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// TODO: Loop till we generate an address NOT in use
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// (TODO, should not matter, link-local is interface scoped)
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// TODO: Should tie it to mac address because of uniqueness
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// on the lan it shall attach to (over lora)
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int dummySock = socket(AF_PACKET, SOCK_PACKET, 0);
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if(dummySock < 0)
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{
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printf("Failed to open configuration socket in order to generate link-local address\n");
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exit(1);
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}
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struct ifreq reqParams;
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memset(&reqParams, 0, sizeof(reqParams));
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strcpy(reqParams.ifr_name, interfaceName);
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if(ioctl(dummySock, SIOCGIFHWADDR, &reqParams) < 0)
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{
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printf("Failed to fetch hardware address Failed to open configuration socket in order to generate link-local address\n");
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exit(1);
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}
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return ll_a;
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}
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void trySixSet2(struct ifreq original, struct in6_addr address, int prefixLen)
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{
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printf("Strat 2, running...\n");
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struct ifreq reqParam;
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memset(&reqParam, 0, sizeof(struct ifreq));
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strcpy(reqParam.ifr_name, original.ifr_name);
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printf("interface name: (1) %s\n", reqParam.ifr_name);
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int dummySock = socket(AF_INET6, SOCK_DGRAM, 0);
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ioctl(dummySock, SIOCGIFINDEX, &reqParam);
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printf("index: %d\n", reqParam.ifr_ifindex);
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printf("interface name: (2) %s\n", reqParam.ifr_name);
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struct sockaddr_in6 _6addr;
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memset(&_6addr, 0, sizeof(struct sockaddr_in6));
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_6addr.sin6_family = AF_INET6;
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_6addr.sin6_addr = address;
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struct sockaddr_in6* _6addrPtr = &_6addr;
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reqParam.ifr_addr = *(struct sockaddr*)_6addrPtr;
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// struct in6_ifreq _6reqParam;
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// _6reqParam.ifr6_ifindex = reqParam.ifr_ifindex;
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// _6reqParam.ifr6_prefixlen = prefixLen;
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// _6reqParam.ifr6_addr = address;
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printf("status after set: %d\n", ioctl(dummySock, SIOCSIFADDR, &_6addr));
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printf("interface name: (3) %s\n", reqParam.ifr_name);
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// while(true){
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ioctl(dummySock, SIOCGIFFLAGS, &reqParam);
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printf("is Up?: %d\n", reqParam.ifr_flags&IFF_UP);
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// }
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close(dummySock);
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exit(1);
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}
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#include <arpa/inet.h>
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void trySixSet
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(
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int interfaceIndex,
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struct in6_addr address,
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int prefixLen
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)
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{
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printf("Strat 1, setting...\n");
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char ip_str[INET6_ADDRSTRLEN+1];
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inet_ntop(AF_INET6, &address, ip_str, INET6_ADDRSTRLEN+1);
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printf
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(
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"Adding IPv6 address of '%s/%d' to interface at if_index %d\n",
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ip_str,
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prefixLen,
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interfaceIndex
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);
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int dummySock = socket(AF_INET6, SOCK_DGRAM, 0);
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struct in6_ifreq paramReq;
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memset(¶mReq, 0, sizeof(struct in6_ifreq));
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paramReq.ifr6_ifindex = interfaceIndex;
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printf("paramReq.ifr6_ifindex: %d\n", paramReq.ifr6_ifindex);
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paramReq.ifr6_prefixlen = prefixLen;
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paramReq.ifr6_addr = address;
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if(ioctl(dummySock, SIOCSIFADDR, ¶mReq) < 0)
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{
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// perror("Fokop");
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printf("Fokop\n");
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cleanup();
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close(dummySock);
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exit(1);
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}
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printf("Sucessfully applied IPv6 configuration");
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close(dummySock);
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}
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#include<string.h>
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int open_tap(void) {
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struct ifreq ifr;
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int fd = open("/dev/net/tun", O_RDWR);
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@ -43,10 +184,19 @@ int open_tap(void) {
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exit(1);
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} else {
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strcpy(if_name, ifr.ifr_name);
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int inet = socket(AF_INET, SOCK_DGRAM, 0);
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int inet = socket(set_ipv4 ? AF_INET : AF_INET6, SOCK_DGRAM, 0);
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printf("inet fd: %d\n", inet);
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printf("tun/tap handle fd: %d\n", fd);
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printf("set_ipv4: %d\n", set_ipv4);
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printf("set_ipv6: %d\n", set_ipv6);
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// inet=fd;
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if (inet == -1) {
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perror("Could not open AF_INET socket");
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char err[100];
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sprintf(err, "Could not open %s socket", set_ipv4 ? "AF_INET" : "AF_INET6");
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perror(err);
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cleanup();
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exit(1);
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} else {
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@ -182,6 +332,64 @@ int open_tap(void) {
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}
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}
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}
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if(set_ipv6) {
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printf("TODO: Implement set ipv6\n");
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// Firstly, obtain the interface index by `ifr_name`
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int dummySock = socket(AF_INET6, SOCK_DGRAM, 0);
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if(ioctl(dummySock, SIOCGIFINDEX, &ifr) < 0)
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{
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printf("Could not get interface index for interface '%s'\n", ifr.ifr_name);
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close(dummySock);
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exit(1);
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}
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char* ipPart = strtok(ipv6_addr, "/");
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char* prefixPart_s = strtok(NULL, "/");
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printf("ip part: %s\n", ipPart);
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if(!prefixPart_s)
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{
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perror("No prefix length was provided"); // TODO: Move logic into arg parsing
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close(dummySock);
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exit(1);
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}
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printf("prefix part: %s\n", prefixPart_s);
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long prefixLen_l = strtol(prefixPart_s, NULL, 10); // TODO: Add handling here for errors (using errno)
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// Convert ASCII IPv6 address to ABI structure
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struct in6_addr six_addr_itself;
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memset(&six_addr_itself, 0, sizeof(struct in6_addr));
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if(inet_pton(AF_INET6, ipv6_addr, &six_addr_itself) < 0)
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{
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printf("Error parsing IPv6 address '%s'", ipv6_addr);
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close(dummySock);
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exit(1);
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}
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// printf("Using prefix length of '%d'\n", netmask);
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// TODO: Add user's requested address
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trySixSet(ifr.ifr_ifindex, six_addr_itself, prefixLen_l);
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trySixSet(ifr.ifr_ifindex, generateLinkLocal(ifr.ifr_ifindex), 64);
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// six_addr_itself.s6_addr[0] = 0xfe;
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// six_addr_itself.s6_addr[1] = 0x80;
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// six_addr_itself.s6_addr[15] = 1;
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// TODO:
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// FIXME: Allow the ipv6 to be empty and just do link-local
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printf("IPv6 settings SHOULD be done now\n");
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}
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}
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}
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}
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@ -195,4 +403,4 @@ int open_tap(void) {
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int close_tap(int tap_fd) {
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return close(tap_fd);
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}
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}
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