linux implementaiton of zerotier-cli dump

one.cpp

@@ -47,6 +47,11 @@
 #include <sys/prctl.h>
 #include <sys/syscall.h>
 #include <sys/wait.h>
+#include <net/if.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <ifaddrs.h>
+#include <sys/ioctl.h>
 #ifndef ZT_NO_CAPABILITIES
 #include <linux/capability.h>
 #include <linux/securebits.h>
@@ -1044,9 +1049,81 @@ static int cli(int argc,char **argv)
 			free(addresses);
 			addresses = NULL;
 		}
+#elif defined(__LINUX__)
+		struct ifreq ifr;
+		struct ifconf ifc;
+		char buf[1024];
+		char stringBuffer[128];
+		int success = 0;
+		
+		int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+		
+		ifc.ifc_len = sizeof(buf);
+		ifc.ifc_buf = buf;
+		ioctl(sock, SIOCGIFCONF, &ifc);
+
+		struct ifreq *it = ifc.ifc_req;
+		const struct ifreq * const end = it + (ifc.ifc_len / sizeof(struct ifreq));
+		int count = 0;
+		for(; it != end; ++it) {
+			strcpy(ifr.ifr_name, it->ifr_name);
+			if(ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
+				if (!(ifr.ifr_flags & IFF_LOOPBACK)) { // skip loopback
+					dump << "Interface " << count++ << ZT_EOL_S << "-----------" << ZT_EOL_S;
+					dump << "Name: " << ifr.ifr_name << ZT_EOL_S;
+					if (ioctl(sock, SIOCGIFMTU, &ifr) == 0) {
+						dump << "MTU: " << ifr.ifr_mtu << ZT_EOL_S;
+					}
+					if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
+						unsigned char mac_addr[6];
+						memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6);
+						char macStr[16];
+						sprintf(macStr, "%02x:%02x:%02x:%02x:%02x:%02x",
+								mac_addr[0],
+								mac_addr[1],
+								mac_addr[2],
+								mac_addr[3],
+								mac_addr[4],
+								mac_addr[5]);
+						dump << "MAC: " << macStr << ZT_EOL_S;
+					}
+
+					dump << "Addresses: " << ZT_EOL_S;
+					struct ifaddrs *ifap, *ifa;
+					void *addr;
+					getifaddrs(&ifap);
+					for(ifa = ifap; ifa; ifa = ifa->ifa_next) {
+						if(strcmp(ifr.ifr_name, ifa->ifa_name) == 0) {
+							if(ifa->ifa_addr->sa_family == AF_INET) {
+								struct sockaddr_in *ipv4 = (struct sockaddr_in*)ifa->ifa_addr;
+								addr = &ipv4->sin_addr;
+							} else if (ifa->ifa_addr->sa_family == AF_INET6) {
+								struct sockaddr_in6 *ipv6 = (struct sockaddr_in6*)ifa->ifa_addr;
+								addr = &ipv6->sin6_addr;
+							} else {
+								continue;
+							}
+							inet_ntop(ifa->ifa_addr->sa_family, addr, stringBuffer, sizeof(stringBuffer));
+							dump << stringBuffer << ZT_EOL_S;
+						}
+					}
+				}
+			}
+		}
+		close(sock);
+		char cwd[PATH_MAX];
+		getcwd(cwd, sizeof(cwd));
+		sprintf(cwd, "%s%szerotier_dump.txt", cwd, ZT_PATH_SEPARATOR_S);
+		fprintf(stdout, "Writing dump to: %s\n", cwd);
+		int fd = open(cwd, O_CREAT|O_RDWR,0664);
+		if (fd == -1) {
+			fprintf(stderr, "Error creating file.\n");
+		}
+		write(fd, dump.str().c_str(), dump.str().size());	
+		close(fd);
 #endif
 
-	fprintf(stderr, "%s\n", dump.str().c_str());
+		// fprintf(stderr, "%s\n", dump.str().c_str());
 
 	} else {
 		cliPrintHelp(argv[0],stderr);