511 lines
11 KiB
C
511 lines
11 KiB
C
#define _BSD_SOURCE
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#include <netinet/ether.h>
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#include <linux/if_packet.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <time.h>
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#include "nmrpd.h"
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#define NMRP_HDR_LEN 6
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#define NMRP_OPT_LEN 4
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#define NMRP_MIN_PKT_LEN (sizeof(struct ether_header) + NMRP_HDR_LEN)
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#define ETH_P_NMRP 0x0912
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#define IP_LEN 4
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#define PACKED __attribute__((__packed__))
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#define MAX_LOOP_RECV 1024
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enum nmrp_code {
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NMRP_C_NONE = 0,
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NMRP_C_ADVERTISE = 1,
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NMRP_C_CONF_REQ = 2,
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NMRP_C_CONF_ACK = 3,
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NMRP_C_CLOSE_REQ = 4,
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NMRP_C_CLOSE_ACK = 5,
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NMRP_C_KEEP_ALIVE_REQ = 6,
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NMRP_C_KEEP_ALIVE_ACK = 7,
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NMRP_C_TFTP_UL_REQ = 16
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};
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enum nmrp_opt_type {
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NMRP_O_MAGIC_NO = 0x0001,
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NMRP_O_DEV_IP = 0x0002,
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NMRP_O_DEV_REGION = 0x0004,
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NMRP_O_FW_UP = 0x0101,
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NMRP_O_ST_UP = 0x0102,
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NMRP_O_FILE_NAME = 0x0181
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};
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struct nmrp_opt {
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uint16_t type;
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uint16_t len;
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union {
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uint8_t magic[4];
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struct {
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uint8_t addr[IP_LEN];
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uint8_t mask[IP_LEN];
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} ip;
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} val;
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} PACKED;
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struct nmrp_msg {
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uint16_t reserved;
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uint8_t code;
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uint8_t id;
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uint16_t len;
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struct nmrp_opt opts[2];
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uint32_t num_opts;
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} PACKED;
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struct nmrp_pkt {
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struct ether_header eh;
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struct nmrp_msg msg;
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} PACKED;
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static void msg_update_len(struct nmrp_msg *msg)
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{
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uint32_t i = 0;
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msg->len = NMRP_HDR_LEN;
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for (; i != msg->num_opts; ++i) {
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msg->len += msg->opts[i].len;
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}
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}
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static void msg_dump(struct nmrp_msg *msg, int dump_opts)
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{
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struct nmrp_opt *opt;
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int remain_len, len, i;
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fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
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msg->reserved, msg->code, msg->id, msg->len);
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remain_len = msg->len - NMRP_HDR_LEN;
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fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
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if (dump_opts) {
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opt = msg->opts;
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while (remain_len > 0) {
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len = opt->len;
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fprintf(stderr, " opt type=%u, len=%u", opt->type, len);
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for (i = 0; i != len - NMRP_OPT_LEN; ++i) {
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if (!(i % 16)) {
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fprintf(stderr, "\n ");
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}
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fprintf(stderr, "%02x ", ((char*)&opt->val)[i] & 0xff);
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}
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fprintf(stderr, "\n");
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remain_len -= len;
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opt = (struct nmrp_opt*)(((char*)opt) + len);
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}
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}
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}
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static void msg_hton(struct nmrp_msg *msg)
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{
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uint32_t i = 0;
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msg->reserved = htons(msg->reserved);
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msg->len = htons(msg->len);
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for (; i != msg->num_opts; ++i) {
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msg->opts[i].len = htons(msg->opts[i].len);
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msg->opts[i].type = htons(msg->opts[i].type);
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}
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}
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static void msg_hdr_ntoh(struct nmrp_msg *msg)
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{
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msg->reserved = ntohs(msg->reserved);
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msg->len = ntohs(msg->len);
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}
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static int msg_ntoh(struct nmrp_msg *msg)
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{
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struct nmrp_opt *opt = msg->opts;
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int remaining;
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msg_hdr_ntoh(msg);
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remaining = msg->len - NMRP_HDR_LEN;
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while (remaining > 0) {
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if (remaining < NMRP_OPT_LEN) {
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fprintf(stderr, "Malformed message.\n");
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msg_dump(msg, 0);
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return 1;
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}
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opt->type = ntohs(opt->type);
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opt->len = ntohs(opt->len);
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remaining -= opt->len;
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++opt;
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}
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if (remaining) {
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fprintf(stderr, "Trailing data in message.\n");
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msg_dump(msg, 0);
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return 1;
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}
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return 0;
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}
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static int intf_get_info(int sock, const char *name, int *index,
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uint8_t *hwaddr)
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{
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
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if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
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perror("ioctl(SIOCGIFINDEX)");
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return -1;
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}
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*index = ifr.ifr_ifindex;
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if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
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perror("ioctl(SIOCGIFHWADDR)");
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return -1;
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}
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memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
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return 0;
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}
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static int pkt_send(int sock, struct sockaddr_ll *addr, struct nmrp_pkt *pkt)
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{
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size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
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return sendto(sock, pkt, len, 0, (struct sockaddr*)addr, sizeof(*addr));
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}
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static int pkt_recv(int sock, struct nmrp_pkt *pkt)
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{
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struct sockaddr_ll from;
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socklen_t addrlen;
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ssize_t bytes, len;
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memset(pkt, 0, sizeof(*pkt));
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bytes = recvfrom(sock, pkt, NMRP_MIN_PKT_LEN, MSG_PEEK,
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(struct sockaddr*)&from, &addrlen);
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if (bytes < 0) {
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if (errno == EAGAIN) {
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return 2;
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}
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perror("recvfrom(pkt)");
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return 1;
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} else if (ntohs(pkt->eh.ether_type) != ETH_P_NMRP) {
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return 3;
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} else if (bytes < NMRP_MIN_PKT_LEN) {
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fprintf(stderr, "Short packet (%zi bytes)\n", bytes);
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return 1;
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}
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msg_hdr_ntoh(&pkt->msg);
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len = pkt->msg.len + sizeof(pkt->eh);
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bytes = recvfrom(sock, pkt, len, MSG_DONTWAIT, NULL, NULL);
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if (bytes < 0) {
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perror("recvfrom(msg)");
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return 1;
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} else if (bytes != len) {
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fprintf(stderr, "Unexpected message length (%zi bytes).\n", len);
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return 1;
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} else {
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if (msg_ntoh(&pkt->msg) != 0) {
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return 1;
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}
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return 0;
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}
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return 1;
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}
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static int sock_bind_to_intf(int sock, const char *name)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
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if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0) {
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perror("setsockopt(SO_BINDTODEVICE)");
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return 1;
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}
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return 0;
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}
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static int mac_parse(const char *str, uint8_t *hwaddr)
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{
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unsigned i, data[6];
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i = sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
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data, data + 1, data + 2, data + 3, data + 4, data + 5);
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if (i == 6) {
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for (i = 0; i != 6; ++i) {
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if (data[i] > 255) {
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break;
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}
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hwaddr[i] = data[i] & 0xff;
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}
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if (i == 6) {
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return 1;
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}
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}
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fprintf(stderr, "Invalid MAC address.\n");
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return 0;
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}
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static const char *spinner = "\\|/-";
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int nmrp_do(struct nmrpd_args *args)
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{
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struct nmrp_pkt tx, rx;
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struct sockaddr_ll addr;
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uint8_t src[ETH_ALEN], dest[ETH_ALEN];
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struct in_addr ipaddr, ipmask;
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time_t beg;
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int i, sock, err, ulreqs, expect;
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if (args->op != NMRP_UPLOAD_FW) {
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fprintf(stderr, "Operation not implemented.\n");
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return 1;
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}
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if (!mac_parse(args->mac, dest)) {
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fprintf(stderr, "Invalid MAC address %s.\n", args->mac);
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return 1;
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}
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if (!inet_aton(args->ipaddr, &ipaddr)) {
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fprintf(stderr, "Invalid IP address %s.\n", args->ipaddr);
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return 1;
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}
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if (!inet_aton(args->ipmask, &ipmask)) {
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fprintf(stderr, "Invalid subnet mask %s.\n", args->ipmask);
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return 1;
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}
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if (access(args->filename, R_OK) == -1) {
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fprintf(stderr, "Error accessing file %s.\n", args->filename);
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return 1;
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}
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err = 1;
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sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_NMRP));
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if (sock == -1) {
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perror("socket");
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return 1;
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}
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if (intf_get_info(sock, args->intf, &addr.sll_ifindex, src)) {
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return 1;
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}
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if (sock_bind_to_intf(sock, args->intf)) {
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return 1;
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}
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if (sock_set_rx_timeout(sock, args->rx_timeout)) {
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return 1;
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}
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addr.sll_family = AF_PACKET;
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addr.sll_protocol = htons(ETH_P_NMRP);
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addr.sll_halen = ETH_ALEN;
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memcpy(addr.sll_addr, dest, ETH_ALEN);
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memcpy(tx.eh.ether_shost, src, ETH_ALEN);
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memcpy(tx.eh.ether_dhost, dest, ETH_ALEN);
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tx.eh.ether_type = htons(ETH_P_NMRP);
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tx.msg.reserved = 0;
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tx.msg.code = NMRP_C_ADVERTISE;
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tx.msg.id = 0;
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tx.msg.num_opts = 1;
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tx.msg.opts[0].type = NMRP_O_MAGIC_NO;
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tx.msg.opts[0].len = NMRP_OPT_LEN + 4;
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tx.msg.opts[0].val.magic[0] = 'N';
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tx.msg.opts[0].val.magic[1] = 'T';
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tx.msg.opts[0].val.magic[2] = 'G';
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tx.msg.opts[0].val.magic[3] = 'R';
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msg_update_len(&tx.msg);
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msg_hton(&tx.msg);
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i = 0;
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beg = time(NULL);
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while (1) {
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printf("\rAdvertising NMRP server on %s ... %c", args->intf,
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spinner[i]);
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fflush(stdout);
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i = (i + 1) & 3;
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if (pkt_send(sock, &addr, &tx) < 0) {
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perror("sendto");
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goto out;
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}
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err = pkt_recv(sock, &rx);
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if (err == 0 && memcmp(rx.eh.ether_dhost, src, ETH_ALEN) == 0) {
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break;
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} else if (err == 1) {
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printf("ERR\n");
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goto out;
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} else {
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if ((time(NULL) - beg) >= 60) {
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printf("\nNo response after 60 seconds. Bailing out.\n");
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goto out;
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}
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}
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}
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printf("\n");
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expect = NMRP_C_CONF_REQ;
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ulreqs = 0;
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do {
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if (expect != NMRP_C_NONE && rx.msg.code != expect) {
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fprintf(stderr, "Received code 0x%02x while waiting for 0x%02x!\n",
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rx.msg.code, expect);
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}
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tx.msg.code = NMRP_C_NONE;
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tx.msg.reserved = 0;
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tx.msg.id = 0;
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tx.msg.num_opts = 0;
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tx.msg.len = 0;
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err = 1;
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switch (rx.msg.code) {
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case NMRP_C_ADVERTISE:
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printf("Received NMRP advertisement from "
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"%02x:%02x:%02x:%02x:%02x:%02x.\n",
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rx.eh.ether_shost[0], rx.eh.ether_shost[1],
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rx.eh.ether_shost[2], rx.eh.ether_shost[3],
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rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
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err = 1;
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goto out;
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case NMRP_C_CONF_REQ:
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tx.msg.code = NMRP_C_CONF_ACK;
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tx.msg.num_opts = 2;
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tx.msg.opts[0].type = NMRP_O_DEV_IP;
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tx.msg.opts[0].len = NMRP_OPT_LEN + 2 * IP_LEN;
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memcpy(tx.msg.opts[0].val.ip.addr, &ipaddr, IP_LEN);
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memcpy(tx.msg.opts[0].val.ip.mask, &ipmask, IP_LEN);
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tx.msg.opts[1].type = NMRP_O_FW_UP;
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tx.msg.opts[1].len = NMRP_OPT_LEN;
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expect = NMRP_C_TFTP_UL_REQ;
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printf("Configuration request received from "
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"%02x:%02x:%02x:%02x:%02x:%02x.\n",
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rx.eh.ether_shost[0], rx.eh.ether_shost[1],
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rx.eh.ether_shost[2], rx.eh.ether_shost[3],
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rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
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memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, ETH_ALEN);
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memcpy(addr.sll_addr, rx.eh.ether_shost, ETH_ALEN);
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printf("Sending configuration: ip %s, mask %s.\n",
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args->ipaddr, args->ipmask);
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break;
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case NMRP_C_TFTP_UL_REQ:
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if (++ulreqs > 5) {
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fprintf(stderr, "Device re-requested file upload %d "
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"times; aborting.\n", ulreqs);
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tx.msg.code = NMRP_C_CLOSE_REQ;
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break;
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}
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if (!args->tftpcmd) {
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printf("Uploading %s ... ", args->filename);
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fflush(stdout);
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err = tftp_put(args);
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} else {
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printf("Running %s ... ", args->tftpcmd);
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fflush(stdout);
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err = system(args->tftpcmd);
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}
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if (!err) {
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printf("OK\nWaiting for remote to respond.\n");
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sock_set_rx_timeout(sock, args->ul_timeout);
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expect = NMRP_C_CLOSE_REQ;
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} else {
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printf("\n");
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goto out;
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}
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break;
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case NMRP_C_KEEP_ALIVE_REQ:
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tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
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break;
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case NMRP_C_CLOSE_REQ:
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tx.msg.code = NMRP_C_CLOSE_ACK;
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break;
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case NMRP_C_CLOSE_ACK:
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err = 0;
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goto out;
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default:
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fprintf(stderr, "Unknown message code 0x%02x!\n",
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rx.msg.code);
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msg_dump(&rx.msg, 0);
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}
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if (tx.msg.code != NMRP_C_NONE) {
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msg_update_len(&tx.msg);
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msg_hton(&tx.msg);
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if (pkt_send(sock, &addr, &tx) < 0) {
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perror("sendto");
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goto out;
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}
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}
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if (rx.msg.code == NMRP_C_CLOSE_REQ) {
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printf("Remote finished. Closing connection.\n");
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break;
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}
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err = pkt_recv(sock, &rx);
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if (err) {
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if (err == 2) {
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fprintf(stderr, "Timeout while waiting for 0x%02x.\n", expect);
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}
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goto out;
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}
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sock_set_rx_timeout(sock, args->rx_timeout);
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} while (1);
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err = 0;
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out:
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close(sock);
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return err;
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}
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