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- /**
- * nmrpflash - Netgear Unbrick Utility
- * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
- *
- * nmrpflash is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * nmrpflash is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with nmrpflash. If not, see <http://www.gnu.org/licenses/>.
- *
- */
- #include <signal.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <errno.h>
- #include <stdio.h>
- #include <time.h>
- #include "nmrpd.h"
- #define NMRP_HDR_LEN 6
- #define NMRP_OPT_LEN 4
- #define NMRP_MIN_PKT_LEN (sizeof(struct eth_hdr) + NMRP_HDR_LEN)
- #define NMRP_MAX_OPT_SIZE 12
- #define NMRP_MAX_OPT_NUM 2
- #define ETH_P_NMRP 0x0912
- #define IP_LEN 4
- #define MAX_LOOP_RECV 1024
- #ifndef PACKED
- #define PACKED __attribute__((__packed__))
- #endif
- enum nmrp_code {
- NMRP_C_NONE = 0,
- NMRP_C_ADVERTISE = 1,
- NMRP_C_CONF_REQ = 2,
- NMRP_C_CONF_ACK = 3,
- NMRP_C_CLOSE_REQ = 4,
- NMRP_C_CLOSE_ACK = 5,
- NMRP_C_KEEP_ALIVE_REQ = 6,
- NMRP_C_KEEP_ALIVE_ACK = 7,
- NMRP_C_TFTP_UL_REQ = 16
- };
- enum nmrp_opt_type {
- NMRP_O_MAGIC_NO = 0x0001,
- NMRP_O_DEV_IP = 0x0002,
- NMRP_O_DEV_REGION = 0x0004,
- NMRP_O_FW_UP = 0x0101,
- NMRP_O_ST_UP = 0x0102,
- NMRP_O_FILE_NAME = 0x0181
- };
- struct nmrp_opt {
- uint16_t type;
- uint16_t len;
- union {
- uint8_t magic[4];
- struct {
- uint8_t addr[4];
- uint8_t mask[4];
- } ip;
- } val;
- } PACKED;
- struct nmrp_msg {
- uint16_t reserved;
- uint8_t code;
- uint8_t id;
- uint16_t len;
- struct nmrp_opt opts[2];
- uint32_t num_opts;
- } PACKED;
- struct eth_hdr {
- uint8_t ether_dhost[6];
- uint8_t ether_shost[6];
- uint16_t ether_type;
- } PACKED;
- struct nmrp_pkt {
- struct eth_hdr eh;
- struct nmrp_msg msg;
- } PACKED;
- static void msg_update_len(struct nmrp_msg *msg)
- {
- uint32_t i = 0;
- msg->len = NMRP_HDR_LEN;
- for (; i != msg->num_opts; ++i) {
- msg->len += msg->opts[i].len;
- }
- }
- static void msg_dump(struct nmrp_msg *msg, int dump_opts)
- {
- struct nmrp_opt *opt;
- int remain_len, len, i;
- fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
- msg->reserved, msg->code, msg->id, msg->len);
- remain_len = msg->len - NMRP_HDR_LEN;
- fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
- if (dump_opts) {
- opt = msg->opts;
- while (remain_len > 0) {
- len = opt->len;
- fprintf(stderr, " opt type=%u, len=%u", opt->type, len);
- for (i = 0; i != len - NMRP_OPT_LEN; ++i) {
- if (!(i % 16)) {
- fprintf(stderr, "\n ");
- }
- fprintf(stderr, "%02x ", ((char*)&opt->val)[i] & 0xff);
- }
- fprintf(stderr, "\n");
- remain_len -= len;
- opt = (struct nmrp_opt*)(((char*)opt) + len);
- }
- }
- }
- static void msg_hton(struct nmrp_msg *msg)
- {
- uint32_t i = 0;
- msg->reserved = htons(msg->reserved);
- msg->len = htons(msg->len);
- for (; i != msg->num_opts; ++i) {
- msg->opts[i].len = htons(msg->opts[i].len);
- msg->opts[i].type = htons(msg->opts[i].type);
- }
- }
- static void msg_hdr_ntoh(struct nmrp_msg *msg)
- {
- msg->reserved = ntohs(msg->reserved);
- msg->len = ntohs(msg->len);
- }
- static int msg_ntoh(struct nmrp_msg *msg)
- {
- struct nmrp_opt *opt = msg->opts;
- int remaining;
- remaining = msg->len - NMRP_HDR_LEN;
- // FIXME maximum of two options supported, maximum option
- // size is 12
- if (remaining < NMRP_MAX_OPT_NUM * NMRP_MAX_OPT_SIZE) {
- while (remaining > 0) {
- if (remaining < NMRP_OPT_LEN) {
- break;
- }
- opt->type = ntohs(opt->type);
- opt->len = ntohs(opt->len);
- if (opt->len > NMRP_MAX_OPT_SIZE) {
- break;
- }
- remaining -= opt->len;
- ++opt;
- }
- if (!remaining) {
- return 0;
- }
- }
- fprintf(stderr, "Unexpected message format.\n");
- msg_dump(msg, 0);
- return 1;
- }
- static int pkt_send(struct ethsock *sock, struct nmrp_pkt *pkt)
- {
- size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
- return ethsock_send(sock, pkt, len);
- }
- static int pkt_recv(struct ethsock *sock, struct nmrp_pkt *pkt)
- {
- ssize_t bytes, len;
- memset(pkt, 0, sizeof(*pkt));
- bytes = ethsock_recv(sock, pkt, sizeof(*pkt));
- if (bytes < 0) {
- return 1;
- } else if (!bytes) {
- return 2;
- } else if (bytes < NMRP_MIN_PKT_LEN) {
- fprintf(stderr, "Short packet (%d bytes)\n", (int)bytes);
- return 1;
- }
- msg_hdr_ntoh(&pkt->msg);
- len = pkt->msg.len + sizeof(pkt->eh);
- if (bytes < len) {
- fprintf(stderr, "Short packet (expected %d, got %d).\n",
- (int)len, (int)bytes);
- return 1;
- }
- return msg_ntoh(&pkt->msg);
- }
- static int mac_parse(const char *str, uint8_t *hwaddr)
- {
- int i;
- unsigned data[6];
- sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
- data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
- if (i == strlen(str)) {
- for (i = 0; i != 6; ++i) {
- if (data[i] > 255) {
- break;
- }
- hwaddr[i] = data[i] & 0xff;
- }
- if (i == 6) {
- return 1;
- }
- }
- return 0;
- }
- static struct ethsock *gsock = NULL;
- static void sigh(int sig)
- {
- printf("\n");
- if (gsock) {
- ethsock_close(gsock);
- }
- exit(1);
- }
- static const char *spinner = "\\|/-";
- int nmrp_do(struct nmrpd_args *args)
- {
- struct nmrp_pkt tx, rx;
- uint8_t *src, dest[6];
- struct in_addr ipaddr, ipmask;
- time_t beg;
- int i, err, ulreqs, expect;
- struct ethsock *sock;
- void (*sigh_orig)(int);
- if (args->op != NMRP_UPLOAD_FW) {
- fprintf(stderr, "Operation not implemented.\n");
- return 1;
- }
- if (!mac_parse(args->mac, dest)) {
- fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
- return 1;
- }
- if ((ipaddr.s_addr = inet_addr(args->ipaddr)) == INADDR_NONE) {
- fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
- return 1;
- }
- if ((ipmask.s_addr = inet_addr(args->ipmask)) == INADDR_NONE) {
- fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
- return 1;
- }
- if (access(args->filename, R_OK) == -1) {
- fprintf(stderr, "Error accessing file '%s'.\n", args->filename);
- return 1;
- }
- err = 1;
- sock = ethsock_create(args->intf, ETH_P_NMRP);
- if (!sock) {
- return 1;
- }
- gsock = sock;
- sigh_orig = signal(SIGINT, sigh);
- if (ethsock_set_timeout(sock, args->rx_timeout)) {
- goto out;
- }
- src = ethsock_get_hwaddr(sock);
- if (!src) {
- goto out;
- }
- memcpy(tx.eh.ether_shost, src, 6);
- memcpy(tx.eh.ether_dhost, dest, 6);
- tx.eh.ether_type = htons(ETH_P_NMRP);
- tx.msg.reserved = 0;
- tx.msg.code = NMRP_C_ADVERTISE;
- tx.msg.id = 0;
- tx.msg.num_opts = 1;
- tx.msg.opts[0].type = NMRP_O_MAGIC_NO;
- tx.msg.opts[0].len = NMRP_OPT_LEN + 4;
- tx.msg.opts[0].val.magic[0] = 'N';
- tx.msg.opts[0].val.magic[1] = 'T';
- tx.msg.opts[0].val.magic[2] = 'G';
- tx.msg.opts[0].val.magic[3] = 'R';
- msg_update_len(&tx.msg);
- msg_hton(&tx.msg);
- i = 0;
- beg = time(NULL);
- while (1) {
- printf("\rAdvertising NMRP server on interface ... %c",
- spinner[i]);
- fflush(stdout);
- i = (i + 1) & 3;
- if (pkt_send(sock, &tx) < 0) {
- perror("sendto");
- goto out;
- }
- err = pkt_recv(sock, &rx);
- if (err == 0 && memcmp(rx.eh.ether_dhost, src, 6) == 0) {
- break;
- } else if (err == 1) {
- printf("ERR\n");
- goto out;
- } else {
- if ((time(NULL) - beg) >= 60) {
- printf("\nNo response after 60 seconds. Bailing out.\n");
- goto out;
- }
- }
- }
- printf("\n");
- expect = NMRP_C_CONF_REQ;
- ulreqs = 0;
- do {
- if (expect != NMRP_C_NONE && rx.msg.code != expect) {
- fprintf(stderr, "Received code 0x%02x while waiting for 0x%02x!\n",
- rx.msg.code, expect);
- }
- tx.msg.code = NMRP_C_NONE;
- tx.msg.reserved = 0;
- tx.msg.id = 0;
- tx.msg.num_opts = 0;
- tx.msg.len = 0;
- err = 1;
- switch (rx.msg.code) {
- case NMRP_C_ADVERTISE:
- printf("Received NMRP advertisement from %s.\n",
- mac_to_str(rx.eh.ether_shost));
- err = 1;
- goto out;
- case NMRP_C_CONF_REQ:
- tx.msg.code = NMRP_C_CONF_ACK;
- tx.msg.num_opts = 2;
- tx.msg.opts[0].type = NMRP_O_DEV_IP;
- tx.msg.opts[0].len = NMRP_OPT_LEN + 2 * 4;
- memcpy(tx.msg.opts[0].val.ip.addr, &ipaddr, 4);
- memcpy(tx.msg.opts[0].val.ip.mask, &ipmask, 4);
- tx.msg.opts[1].type = NMRP_O_FW_UP;
- tx.msg.opts[1].len = NMRP_OPT_LEN;
- expect = NMRP_C_TFTP_UL_REQ;
- printf("Received configuration request from %s.\n",
- mac_to_str(rx.eh.ether_shost));
- memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, 6);
- printf("Sending configuration: ip %s, mask %s.\n",
- args->ipaddr, args->ipmask);
- break;
- case NMRP_C_TFTP_UL_REQ:
- if (++ulreqs > 5) {
- fprintf(stderr, "Device re-requested file upload %d "
- "times; aborting.\n", ulreqs);
- tx.msg.code = NMRP_C_CLOSE_REQ;
- break;
- }
- if (!args->tftpcmd) {
- printf("Uploading %s ... ", args->filename);
- fflush(stdout);
- err = tftp_put(args);
- } else {
- printf("Running %s ... ", args->tftpcmd);
- fflush(stdout);
- err = system(args->tftpcmd);
- }
- if (!err) {
- printf("OK\nWaiting for remote to respond.\n");
- ethsock_set_timeout(sock, args->ul_timeout);
- expect = NMRP_C_CLOSE_REQ;
- } else if (err == -2) {
- expect = NMRP_C_TFTP_UL_REQ;
- } else {
- goto out;
- }
- break;
- case NMRP_C_KEEP_ALIVE_REQ:
- tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
- break;
- case NMRP_C_CLOSE_REQ:
- tx.msg.code = NMRP_C_CLOSE_ACK;
- break;
- case NMRP_C_CLOSE_ACK:
- err = 0;
- goto out;
- default:
- fprintf(stderr, "Unknown message code 0x%02x!\n",
- rx.msg.code);
- msg_dump(&rx.msg, 0);
- }
- if (tx.msg.code != NMRP_C_NONE) {
- msg_update_len(&tx.msg);
- msg_hton(&tx.msg);
- if (pkt_send(sock, &tx) < 0) {
- perror("sendto");
- goto out;
- }
- }
- if (rx.msg.code == NMRP_C_CLOSE_REQ) {
- printf("Remote finished. Closing connection.\n");
- break;
- }
- err = pkt_recv(sock, &rx);
- if (err) {
- if (err == 2) {
- fprintf(stderr, "Timeout while waiting for 0x%02x.\n", expect);
- }
- goto out;
- }
- ethsock_set_timeout(sock, args->rx_timeout);
- } while (1);
- err = 0;
- out:
- signal(SIGINT, sigh_orig);
- gsock = NULL;
- ethsock_close(sock);
- return err;
- }
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