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-rw-r--r--toys/pending/arping.c298
1 files changed, 298 insertions, 0 deletions
diff --git a/toys/pending/arping.c b/toys/pending/arping.c
new file mode 100644
index 00000000..75a691f7
--- /dev/null
+++ b/toys/pending/arping.c
@@ -0,0 +1,298 @@
+/* arping - send ARP REQUEST to a neighbour host.
+ *
+ * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard.
+
+USE_ARPING(NEWTOY(arping, "<1>1s:I:w#<0c#<0AUDbqf[+AU][+Df]", TOYFLAG_USR|TOYFLAG_SBIN))
+
+config ARPING
+ bool "arping"
+ default n
+ help
+ Usage: arping [-fqbDUA] [-c CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP
+
+ Send ARP requests/replies
+
+ -f Quit on first ARP reply
+ -q Quiet
+ -b Keep broadcasting, don't go unicast
+ -D Duplicated address detection mode
+ -U Unsolicited ARP mode, update your neighbors
+ -A ARP answer mode, update your neighbors
+ -c N Stop after sending N ARP requests
+ -w TIMEOUT Time to wait for ARP reply, seconds
+ -I IFACE Interface to use (default eth0)
+ -s SRC_IP Sender IP address
+ DST_IP Target IP address
+*/
+#define FOR_arping
+#include "toys.h"
+#include <netinet/ether.h>
+#include <netpacket/packet.h>
+
+GLOBALS(
+ long count;
+ unsigned long time_out;
+ char *iface;
+ char *src_ip;
+
+ int sockfd;
+ unsigned start;
+ unsigned end;
+ unsigned sent_at;
+ unsigned sent_nr;
+ unsigned rcvd_nr;
+ unsigned brd_sent;
+ unsigned rcvd_req;
+ unsigned brd_rcv;
+ unsigned unicast_flag;
+)
+
+struct sockaddr_ll src_pk, dst_pk;
+struct in_addr src_addr, dest_addr;
+extern void *mempcpy(void *dest, const void *src, size_t n);
+
+// Gets information of INTERFACE and updates IFINDEX, MAC and IP.
+static void get_interface(char *interface, int *ifindex, uint32_t *oip,
+ uint8_t *mac)
+{
+ struct ifreq req;
+ struct sockaddr_in *ip;
+ int fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+
+ req.ifr_addr.sa_family = AF_INET;
+ strncpy(req.ifr_name, interface, IFNAMSIZ);
+ req.ifr_name[IFNAMSIZ-1] = '\0';
+
+ xioctl(fd, SIOCGIFFLAGS, &req);
+ if (!(req.ifr_flags & IFF_UP)) return;
+
+ if (oip) {
+ xioctl(fd, SIOCGIFADDR, &req);
+ ip = (struct sockaddr_in*) &req.ifr_addr;
+ *oip = ntohl(ip->sin_addr.s_addr);
+ }
+ if (ifindex) {
+ xioctl(fd, SIOCGIFINDEX, &req);
+ *ifindex = req.ifr_ifindex;
+ }
+ if (mac) {
+ xioctl(fd, SIOCGIFHWADDR, &req);
+ memcpy(mac, req.ifr_hwaddr.sa_data, 6);
+ }
+ xclose(fd);
+}
+
+// SIGINT handler, Print Number of Packets send or receive details.
+static void done(int sig)
+{
+ if (!(toys.optflags & FLAG_q)) {
+ xprintf("Sent %u probe(s) (%u broadcast(s))\n", TT.sent_nr, TT.brd_sent);
+ xprintf("Received %u repl%s (%u request(s), %u broadcast(s))\n",
+ TT.rcvd_nr, TT.rcvd_nr == 1 ? "y":"ies", TT.rcvd_req, TT.brd_rcv);
+ }
+ if (toys.optflags & FLAG_D) exit(!!TT.rcvd_nr);
+ //In -U mode, No reply is expected.
+ if (toys.optflags & FLAG_U) exit(EXIT_SUCCESS);
+ exit(!TT.rcvd_nr);
+}
+
+// Create and Send Packet
+static void send_packet()
+{
+ int ret;
+ unsigned char sbuf[256] = {0,};
+ struct arphdr *arp_h = (struct arphdr *) sbuf;
+ unsigned char *ptr = (unsigned char *)(arp_h + 1);
+
+ arp_h->ar_hrd = htons(ARPHRD_ETHER);
+ arp_h->ar_pro = htons(ETH_P_IP);
+ arp_h->ar_hln = src_pk.sll_halen;
+ arp_h->ar_pln = 4;
+ arp_h->ar_op = (toys.optflags & FLAG_A) ? htons(ARPOP_REPLY)
+ : htons(ARPOP_REQUEST);
+
+ ptr = mempcpy(ptr, &src_pk.sll_addr, src_pk.sll_halen);
+ ptr = mempcpy(ptr, &src_addr, 4);
+ if (toys.optflags & FLAG_A)
+ ptr = mempcpy(ptr, &src_pk.sll_addr, src_pk.sll_halen);
+ else ptr = mempcpy(ptr, &dst_pk.sll_addr, src_pk.sll_halen);
+
+ ptr = mempcpy(ptr, &dest_addr, 4);
+ ret = sendto(TT.sockfd, sbuf, ptr - sbuf, 0,
+ (struct sockaddr *)&dst_pk, sizeof(dst_pk));
+ if (ret == ptr - sbuf) {
+ struct timeval tval;
+
+ gettimeofday(&tval, NULL);
+ TT.sent_at = (tval.tv_sec * 1000000ULL + (tval.tv_usec));
+ TT.sent_nr++;
+ if (!TT.unicast_flag) TT.brd_sent++;
+ }
+}
+
+// Receive Packet and filter with valid checks.
+static void recv_from(struct sockaddr_ll *from, int *recv_len)
+{
+ struct in_addr s_ip, d_ip;
+ struct arphdr *arp_hdr = (struct arphdr *)toybuf;
+ unsigned char *p = (unsigned char *)(arp_hdr + 1);
+
+ if (arp_hdr->ar_op != htons(ARPOP_REQUEST) &&
+ arp_hdr->ar_op != htons(ARPOP_REPLY)) return;
+
+ if (from->sll_pkttype != PACKET_HOST && from->sll_pkttype != PACKET_BROADCAST
+ && from->sll_pkttype != PACKET_MULTICAST) return;
+
+ if (arp_hdr->ar_pro != htons(ETH_P_IP) || (arp_hdr->ar_pln != 4)
+ || (arp_hdr->ar_hln != src_pk.sll_halen)
+ || (*recv_len < (int)(sizeof(*arp_hdr) + 2 * (4 + arp_hdr->ar_hln))))
+ return;
+
+ memcpy(&s_ip.s_addr, p + arp_hdr->ar_hln, 4);
+ memcpy(&d_ip.s_addr, p + arp_hdr->ar_hln + 4 + arp_hdr->ar_hln, 4);
+
+ if (dest_addr.s_addr != s_ip.s_addr) return;
+ if (toys.optflags & FLAG_D) {
+ if (src_addr.s_addr && src_addr.s_addr != d_ip.s_addr) return;
+ if (!memcmp(p, &src_pk.sll_addr, src_pk.sll_halen)) return;
+ } else if (src_addr.s_addr != d_ip.s_addr ) return;
+
+ if (!(toys.optflags & FLAG_q)) {
+ printf("%scast re%s from %s [%s]",
+ from->sll_pkttype == PACKET_HOST ? "Uni" : "Broad",
+ arp_hdr->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest",
+ inet_ntoa(s_ip), ether_ntoa((struct ether_addr *) p));
+ if (TT.sent_at) {
+ unsigned delta;
+ struct timeval tval;
+
+ gettimeofday(&tval, NULL);
+ delta = (tval.tv_sec * 1000000ULL + (tval.tv_usec)) - TT.sent_at;
+ xprintf(" %u.%03ums\n", delta / 1000, delta % 1000);
+ xflush();
+ }
+ }
+ TT.rcvd_nr++;
+ if (from->sll_pkttype != PACKET_HOST) TT.brd_rcv++;
+ if (arp_hdr->ar_op == htons(ARPOP_REQUEST)) TT.rcvd_req++;
+ if (toys.optflags & FLAG_f) done(0);
+ if (!(toys.optflags & FLAG_b)) {
+ memcpy(dst_pk.sll_addr, p, src_pk.sll_halen);
+ TT.unicast_flag = 1;
+ }
+}
+
+// Alarm signal Handle, send packets in one second interval.
+static void send_signal(int sig)
+{
+ struct timeval start;
+
+ gettimeofday(&start, NULL);
+ if (!TT.start)
+ TT.end = TT.start = start.tv_sec * 1000 + start.tv_usec / 1000;
+ else TT.end = start.tv_sec*1000 + start.tv_usec / 1000;
+ if (toys.optflags & FLAG_c) {
+ if (!TT.count) done(0);
+ TT.count--;
+ }
+ if ((toys.optflags & FLAG_w) && ((TT.end - TT.start) >
+ ((TT.time_out)*1000))) done(0);
+ send_packet();
+ alarm(1);
+}
+
+void arping_main(void)
+{
+ struct ifreq ifr;
+ struct sockaddr_ll from;
+ socklen_t len;
+ int if_index, recv_len;
+
+ if (!(toys.optflags & FLAG_I)) TT.iface = "eth0";
+ TT.sockfd = xsocket(AF_PACKET, SOCK_DGRAM, 0);
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, TT.iface, IFNAMSIZ);
+ get_interface(TT.iface, &if_index, NULL, NULL);
+ src_pk.sll_ifindex = if_index;
+
+ xioctl(TT.sockfd, SIOCGIFFLAGS, (char*)&ifr);
+ if (!(ifr.ifr_flags & IFF_UP) && !(toys.optflags & FLAG_q))
+ error_exit("Interface \"%s\" is down", TT.iface);
+ if ((ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK))
+ && !(toys.optflags & FLAG_q)) {
+ xprintf("Interface \"%s\" is not ARPable\n", TT.iface);
+ toys.exitval = (toys.optflags & FLAG_D) ? 0 : 2;
+ return;
+ }
+ if (!inet_aton(*toys.optargs, &dest_addr)) {
+ struct hostent *hp = gethostbyname2(*toys.optargs, AF_INET);
+
+ if (!hp) perror_exit("bad address '%s'", *toys.optargs);
+ memcpy(&dest_addr, hp->h_addr, 4);
+ }
+ if ((toys.optflags & FLAG_s) && !(inet_aton(TT.src_ip, &src_addr)))
+ perror_exit("invalid source address '%s'",TT.src_ip);
+ if (!(toys.optflags & FLAG_D) && (toys.optflags & FLAG_U)
+ && !src_addr.s_addr) src_addr = dest_addr;
+ if (!(toys.optflags & FLAG_D) || src_addr.s_addr) {
+ struct sockaddr_in saddr;
+ int p_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+
+ if (setsockopt(p_fd, SOL_SOCKET, SO_BINDTODEVICE, TT.iface,
+ strlen(TT.iface))) perror_exit("setsockopt");
+
+ memset(&saddr, 0, sizeof(saddr));
+ saddr.sin_family = AF_INET;
+ if (src_addr.s_addr) {
+ saddr.sin_addr = src_addr;
+ if (bind(p_fd, (struct sockaddr*)&saddr, sizeof(saddr)))
+ perror_exit("bind");
+ } else {
+ uint32_t oip;
+
+ saddr.sin_port = htons(1025);
+ saddr.sin_addr = dest_addr;
+ if (connect(p_fd, (struct sockaddr *) &saddr, sizeof(saddr)))
+ perror_exit("cannot connect to remote host");
+ get_interface(TT.iface, NULL, &oip, NULL);
+ src_addr.s_addr = htonl(oip);
+ }
+ xclose(p_fd);
+ }
+
+ src_pk.sll_family = AF_PACKET;
+ src_pk.sll_protocol = htons(ETH_P_ARP);
+ if (bind(TT.sockfd, (struct sockaddr *)&src_pk, sizeof(src_pk)))
+ perror_exit("bind");
+
+ socklen_t alen = sizeof(src_pk);
+ getsockname(TT.sockfd, (struct sockaddr *)&src_pk, &alen);
+ if (!src_pk.sll_halen) {
+ perror_msg("src is not arpable");
+ toys.exitval = (toys.optflags & FLAG_D) ? 0 : 2;
+ return;
+ }
+ if (!(toys.optflags & FLAG_q)) {
+ xprintf("ARPING to %s", inet_ntoa(dest_addr));
+ xprintf(" from %s via %s\n", inet_ntoa(src_addr), TT.iface);
+ }
+
+ dst_pk = src_pk;
+ //First packet always broadcasts.
+ memset(dst_pk.sll_addr, -1, dst_pk.sll_halen);
+ signal(SIGINT, done);
+ signal(SIGALRM, send_signal);
+
+ send_signal(0); // Send first Broadcast message.
+ while (1) {
+ len = sizeof(from);
+ recv_len = recvfrom(TT.sockfd, toybuf, 4096, 0,
+ (struct sockaddr *)&from, &len);
+ if (recv_len < 0) continue;
+ recv_from(&from, &recv_len);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 19:32:00 +0000