--- /dev/null
+/* tftp.c - TFTP client.
+ *
+ * Copyright 2012 Madhur Verma <mad.flexi@gmail.com>
+ * Copyright 2015 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
+ *
+ * No Standard.
+
+USE_TFTP(NEWTOY(tftp, "<1b#<8>65464r:l:g|p|[!gp]", TOYFLAG_USR|TOYFLAG_BIN))
+
+config TFTP
+ bool "tftp"
+ default n
+ help
+ usage: tftp [OPTIONS] HOST [PORT]
+
+ Transfer file from/to tftp server.
+
+ -l FILE Local FILE
+ -r FILE Remote FILE
+ -g Get file
+ -p Put file
+ -b SIZE Transfer blocks of SIZE octets(8 <= SIZE <= 65464)
+*/
+#define FOR_tftp
+#include "toys.h"
+
+GLOBALS(
+ char *local_file;
+ char *remote_file;
+ long block_size;
+
+ struct sockaddr_storage inaddr;
+ int af;
+)
+
+#define TFTP_BLKSIZE 512
+#define TFTP_RETRIES 3
+#define TFTP_DATAHEADERSIZE 4
+#define TFTP_MAXPACKETSIZE (TFTP_DATAHEADERSIZE + TFTP_BLKSIZE)
+#define TFTP_PACKETSIZE TFTP_MAXPACKETSIZE
+#define TFTP_DATASIZE (TFTP_PACKETSIZE-TFTP_DATAHEADERSIZE)
+#define TFTP_IOBUFSIZE (TFTP_PACKETSIZE+8)
+
+#define TFTP_OP_RRQ 1 /* Read Request RFC 1350, RFC 2090 */
+#define TFTP_OP_WRQ 2 /* Write Request RFC 1350 */
+#define TFTP_OP_DATA 3 /* Data chunk RFC 1350 */
+#define TFTP_OP_ACK 4 /* Acknowledgement RFC 1350 */
+#define TFTP_OP_ERR 5 /* Error Message RFC 1350 */
+#define TFTP_OP_OACK 6 /* Option acknowledgment RFC 2347 */
+
+#define TFTP_ER_ILLEGALOP 4 /* Illegal TFTP operation */
+#define TFTP_ER_UNKID 5 /* Unknown transfer ID */
+
+#define TFTP_ES_NOSUCHFILE "File not found"
+#define TFTP_ES_ACCESS "Access violation"
+#define TFTP_ES_FULL "Disk full or allocation exceeded"
+#define TFTP_ES_ILLEGALOP "Illegal TFTP operation"
+#define TFTP_ES_UNKID "Unknown transfer ID"
+#define TFTP_ES_EXISTS "File already exists"
+#define TFTP_ES_UNKUSER "No such user"
+#define TFTP_ES_NEGOTIATE "Terminate transfer due to option negotiation"
+
+// Initializes SERVER with ADDR and returns socket.
+static int init_tftp(struct sockaddr_storage *server)
+{
+ struct timeval to = { .tv_sec = 10, //Time out
+ .tv_usec = 0 };
+ const int set = 1;
+ int port = 69, sd = xsocket(TT.af, SOCK_DGRAM, IPPROTO_UDP);
+
+ xsetsockopt(sd, SOL_SOCKET, SO_RCVTIMEO, (void *)&to, sizeof(struct timeval));
+ xsetsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (void *)&set, sizeof(set));
+
+ if(toys.optc == 2) port = atolx_range(toys.optargs[1], 1, 65535);
+ memset(server, 0, sizeof(struct sockaddr_storage));
+ if (TT.af == AF_INET6) {
+ ((struct sockaddr_in6 *)server)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6 *)server)->sin6_addr =
+ ((struct sockaddr_in6 *)&TT.inaddr)->sin6_addr;
+ ((struct sockaddr_in6 *)server)->sin6_port = htons(port);
+ }
+ else {
+ ((struct sockaddr_in *)server)->sin_family = AF_INET;
+ ((struct sockaddr_in *)server)->sin_addr.s_addr =
+ ((struct sockaddr_in *)&TT.inaddr)->sin_addr.s_addr;
+ ((struct sockaddr_in *)server)->sin_port = htons(port);
+ }
+ return sd;
+}
+
+/*
+ * Makes a request packet in BUFFER with OPCODE and file PATH of MODE
+ * and returns length of packet.
+ */
+static int mkpkt_request(uint8_t *buffer, int opcode, char *path, int mode)
+{
+ buffer[0] = opcode >> 8;
+ buffer[1] = opcode & 0xff;
+ if(strlen(path) > TFTP_BLKSIZE) error_exit("path too long");
+ return sprintf((char*) &buffer[2], "%s%c%s", path, 0,
+ (mode ? "octet" : "netascii")) + 3;
+}
+
+/*
+ * Makes an acknowledgement packet in BUFFER of BLOCNO
+ * and returns packet length.
+ */
+static int mkpkt_ack(uint8_t *buffer, uint16_t blockno)
+{
+ buffer[0] = TFTP_OP_ACK >> 8;
+ buffer[1] = TFTP_OP_ACK & 0xff;
+ buffer[2] = blockno >> 8;
+ buffer[3] = blockno & 0xff;
+ return 4;
+}
+
+/*
+ * Makes an error packet in BUFFER with ERRORCODE and ERRORMSG.
+ * and returns packet length.
+ */
+static int mkpkt_err(uint8_t *buffer, uint16_t errorcode, char *errormsg)
+{
+ buffer[0] = TFTP_OP_ERR >> 8;
+ buffer[1] = TFTP_OP_ERR & 0xff;
+ buffer[2] = errorcode >> 8;
+ buffer[3] = errorcode & 0xff;
+ strcpy((char*) &buffer[4], errormsg);
+ return strlen(errormsg) + 5;
+}
+
+/*
+ * Recieves data from server in BUFF with socket SD and updates FROM
+ * and returns read length.
+ */
+static ssize_t read_server(int sd, void *buf, size_t len,
+ struct sockaddr_storage *from)
+{
+ socklen_t alen;
+ ssize_t nb;
+
+ for (;;) {
+ memset(buf, 0, len);
+ alen = sizeof(struct sockaddr_storage);
+ nb = recvfrom(sd, buf, len, 0, (struct sockaddr *) from, &alen);
+ if (nb < 0) {
+ if (errno == EAGAIN) {
+ perror_msg("server read timed out");
+ return nb;
+ }else if (errno != EINTR) {
+ perror_msg("server read failed");
+ return nb;
+ }
+ }else return nb;
+ }
+ return nb;
+}
+
+/*
+ * sends data to server TO from BUFF of length LEN through socket SD
+ * and returns successfully send bytes number.
+ */
+static ssize_t write_server(int sd, void *buf, size_t len,
+ struct sockaddr_storage *to)
+{
+ ssize_t nb;
+
+ for (;;) {
+ nb = sendto(sd, buf, len, 0, (struct sockaddr *)to,
+ sizeof(struct sockaddr_storage));
+ if (nb < 0) {
+ if (errno != EINTR) {
+ perror_msg("server write failed");
+ return nb;
+ }
+ } else return nb;
+ }
+ return nb;
+}
+
+// checks packet for data and updates block no
+static inline int check_data( uint8_t *packet, uint16_t *opcode,
+ uint16_t *blockno)
+{
+ *opcode = (uint16_t) packet[0] << 8 | (uint16_t) packet[1];
+ if (*opcode == TFTP_OP_DATA) {
+ *blockno = (uint16_t) packet[2] << 8 | (uint16_t) packet[3];
+ return 0;
+ }
+ return -1;
+}
+
+// Makes data packet through FD from file OFFSET in buffer PACKET of BLOCKNO
+static int mkpkt_data(int fd, off_t offset, uint8_t *packet, uint16_t blockno)
+{
+ off_t tmp;
+ int nbytesread;
+
+ packet[0] = TFTP_OP_DATA >> 8;
+ packet[1] = TFTP_OP_DATA & 0xff;
+ packet[2] = blockno >> 8;
+ packet[3] = blockno & 0xff;
+ tmp = lseek(fd, offset, SEEK_SET);
+ if (tmp == (off_t) -1) {
+ perror_msg("lseek failed");
+ return -1;
+ }
+ nbytesread = readall(fd, &packet[TFTP_DATAHEADERSIZE], TFTP_DATASIZE);
+ if (nbytesread < 0) return -1;
+ return nbytesread + TFTP_DATAHEADERSIZE;
+}
+
+// Receives ACK responses from server and updates blockno
+static int read_ack(int sd, uint8_t *packet, struct sockaddr_storage *server,
+ uint16_t *port, uint16_t *blockno)
+{
+ struct sockaddr_storage from;
+ ssize_t nbytes;
+ uint16_t opcode, rblockno;
+ int packetlen, retry;
+
+ for (retry = 0; retry < TFTP_RETRIES; retry++) {
+ for (;;) {
+ nbytes = read_server(sd, packet, TFTP_IOBUFSIZE, &from);
+ if (nbytes < 4) { // Ack headersize = 4
+ if (nbytes == 0) error_msg("Connection lost.");
+ else if (nbytes > 0) error_msg("Short packet: %d bytes", nbytes);
+ else error_msg("Server read ACK failure.");
+ break;
+ } else {
+ if (!*port) {
+ *port = ((struct sockaddr_in *)&from)->sin_port;
+ ((struct sockaddr_in *)server)->sin_port =
+ ((struct sockaddr_in *)&from)->sin_port;
+ }
+ if (((struct sockaddr_in *)server)->sin_addr.s_addr !=
+ ((struct sockaddr_in *)&from)->sin_addr.s_addr) {
+ error_msg("Invalid address in DATA.");
+ continue;
+ }
+ if (*port != ((struct sockaddr_in *)server)->sin_port) {
+ error_msg("Invalid port in DATA.");
+ packetlen = mkpkt_err(packet, TFTP_ER_UNKID, TFTP_ES_UNKID);
+ (void) write_server(sd, packet, packetlen, server);
+ continue;
+ }
+ opcode = (uint16_t) packet[0] << 8 | (uint16_t) packet[1];
+ rblockno = (uint16_t) packet[2] << 8 | (uint16_t) packet[3];
+
+ if (opcode != TFTP_OP_ACK) {
+ error_msg("Bad opcode.");
+ if (opcode > 5) {
+ packetlen = mkpkt_err(packet, TFTP_ER_ILLEGALOP, TFTP_ES_ILLEGALOP);
+ (void) write_server(sd, packet, packetlen, server);
+ }
+ break;
+ }
+ if (blockno) *blockno = rblockno;
+ return 0;
+ }
+ }
+ }
+ error_msg("Timeout, Waiting for ACK.");
+ return -1;
+}
+
+// receives file from server.
+static int file_get(void)
+{
+ struct sockaddr_storage server, from;
+ uint8_t *packet;
+ uint16_t blockno = 0, opcode, rblockno = 0;
+ int len, sd, fd, retry, nbytesrecvd = 0, ndatabytes, ret, result = -1;
+
+ sd = init_tftp(&server);
+
+ packet = (uint8_t*) xzalloc(TFTP_IOBUFSIZE);
+ fd = xcreate(TT.local_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+
+ len = mkpkt_request(packet, TFTP_OP_RRQ, TT.remote_file, 1);
+ ret = write_server(sd, packet, len, &server);
+ if (ret != len){
+ unlink(TT.local_file);
+ goto errout_with_sd;
+ }
+ if (TT.af == AF_INET6) ((struct sockaddr_in6 *)&server)->sin6_port = 0;
+ else ((struct sockaddr_in *)&server)->sin_port = 0;
+
+ do {
+ blockno++;
+ for (retry = 0 ; retry < TFTP_RETRIES; retry++) {
+ nbytesrecvd = read_server(sd, packet, TFTP_IOBUFSIZE, &from);
+ if (nbytesrecvd > 0) {
+ if ( ((TT.af == AF_INET) &&
+ memcmp(&((struct sockaddr_in *)&server)->sin_addr,
+ &((struct sockaddr_in *)&from)->sin_addr,
+ sizeof(struct in_addr))) ||
+ ((TT.af == AF_INET6) &&
+ memcmp(&((struct sockaddr_in6 *)&server)->sin6_addr,
+ &((struct sockaddr_in6 *)&from)->sin6_addr,
+ sizeof(struct in6_addr)))) {
+ error_msg("Invalid address in DATA.");
+ retry--;
+ continue;
+ }
+ if ( ((TT.af == AF_INET) && ((struct sockaddr_in *)&server)->sin_port
+ && (((struct sockaddr_in *)&server)->sin_port !=
+ ((struct sockaddr_in *)&from)->sin_port)) ||
+ ((TT.af == AF_INET6) && ((struct sockaddr_in6 *)&server)->sin6_port
+ && (((struct sockaddr_in6 *)&server)->sin6_port !=
+ ((struct sockaddr_in6 *)&from)->sin6_port))) {
+ error_msg("Invalid port in DATA.");
+ len = mkpkt_err(packet, TFTP_ER_UNKID, TFTP_ES_UNKID);
+ ret = write_server(sd, packet, len, &from);
+ retry--;
+ continue;
+ }
+ if (nbytesrecvd < TFTP_DATAHEADERSIZE) {
+ error_msg("Tiny data packet ignored.");
+ continue;
+ }
+ if (check_data(packet, &opcode, &rblockno) != 0
+ || blockno != rblockno) {
+
+ if (opcode == TFTP_OP_ERR) {
+ char *message = "DATA Check failure.";
+ char *arr[] = {TFTP_ES_NOSUCHFILE, TFTP_ES_ACCESS,
+ TFTP_ES_FULL, TFTP_ES_ILLEGALOP,
+ TFTP_ES_UNKID, TFTP_ES_EXISTS,
+ TFTP_ES_UNKUSER, TFTP_ES_NEGOTIATE};
+ if (rblockno && (rblockno < 9)) message = arr[rblockno - 1];
+ error_msg(message);
+ }
+ if (opcode > 5) {
+ len = mkpkt_err(packet, TFTP_ER_ILLEGALOP, TFTP_ES_ILLEGALOP);
+ ret = write_server(sd, packet, len, &from);
+ }
+ continue;
+ }
+ if ((TT.af == AF_INET6) && !((struct sockaddr_in6 *)&server)->sin6_port)
+ ((struct sockaddr_in6 *)&server)->sin6_port =
+ ((struct sockaddr_in6 *)&from)->sin6_port;
+ else if ((TT.af == AF_INET) && !((struct sockaddr_in *)&server)->sin_port)
+ ((struct sockaddr_in *)&server)->sin_port =
+ ((struct sockaddr_in *)&from)->sin_port;
+ break;
+ }
+ }
+ if (retry == TFTP_RETRIES) {
+ error_msg("Retry limit exceeded.");
+ unlink(TT.local_file);
+ goto errout_with_sd;
+ }
+ ndatabytes = nbytesrecvd - TFTP_DATAHEADERSIZE;
+ if (writeall(fd, packet + TFTP_DATAHEADERSIZE, ndatabytes) < 0){
+ unlink(TT.local_file);
+ goto errout_with_sd;
+ }
+ len = mkpkt_ack(packet, blockno);
+ ret = write_server(sd, packet, len, &server);
+ if (ret != len){
+ unlink(TT.local_file);
+ goto errout_with_sd;
+ }
+ } while (ndatabytes >= TFTP_DATASIZE);
+
+ result = 0;
+
+errout_with_sd: xclose(sd);
+ free(packet);
+ return result;
+}
+
+// Sends file to server.
+int file_put(void)
+{
+ struct sockaddr_storage server;
+ uint8_t *packet;
+ off_t offset = 0;
+ uint16_t blockno = 1, rblockno, port = 0;
+ int packetlen, sd, fd, retry = 0, ret, result = -1;
+
+ sd = init_tftp(&server);
+ packet = (uint8_t*)xzalloc(TFTP_IOBUFSIZE);
+ fd = xopen(TT.local_file, O_RDONLY);
+
+ for (;;) { //first loop for request send and confirmation from server.
+ packetlen = mkpkt_request(packet, TFTP_OP_WRQ, TT.remote_file, 1);
+ ret = write_server(sd, packet, packetlen, &server);
+ if (ret != packetlen) goto errout_with_sd;
+ if (read_ack(sd, packet, &server, &port, NULL) == 0) break;
+ if (++retry > TFTP_RETRIES) {
+ error_msg("Retry count exceeded.");
+ goto errout_with_sd;
+ }
+ }
+ for (;;) { // loop for data sending and receving ack from server.
+ packetlen = mkpkt_data(fd, offset, packet, blockno);
+ if (packetlen < 0) goto errout_with_sd;
+
+ ret = write_server(sd, packet, packetlen, &server);
+ if (ret != packetlen) goto errout_with_sd;
+
+ if (read_ack(sd, packet, &server, &port, &rblockno) == 0) {
+ if (rblockno == blockno) {
+ if (packetlen < TFTP_PACKETSIZE) break;
+ blockno++;
+ offset += TFTP_DATASIZE;
+ retry = 0;
+ continue;
+ }
+ }
+ if (++retry > TFTP_RETRIES) {
+ error_msg("Retry count exceeded.");
+ goto errout_with_sd;
+ }
+ }
+ result = 0;
+
+errout_with_sd: close(sd);
+ free(packet);
+ return result;
+}
+
+void tftp_main(void)
+{
+ struct addrinfo *info, rp, *res=0;
+ int ret;
+
+ if (toys.optflags & FLAG_r) {
+ if (!(toys.optflags & FLAG_l)) {
+ char *slash = strrchr(TT.remote_file, '/');
+ TT.local_file = (slash) ? slash + 1 : TT.remote_file;
+ }
+ } else if (toys.optflags & FLAG_l) TT.remote_file = TT.local_file;
+ else error_exit("Please provide some files.");
+
+ memset(&rp, 0, sizeof(rp));
+ rp.ai_family = AF_UNSPEC;
+ rp.ai_socktype = SOCK_STREAM;
+ ret = getaddrinfo(toys.optargs[0], toys.optargs[1], &rp, &info);
+ if (!ret) {
+ for (res = info; res; res = res->ai_next)
+ if ( (res->ai_family == AF_INET) || (res->ai_family == AF_INET6)) break;
+ }
+ if (!res)
+ error_exit("bad address '%s' : %s", toys.optargs[0], gai_strerror(ret));
+ TT.af = info->ai_family;
+
+ memcpy((void *)&TT.inaddr, info->ai_addr, info->ai_addrlen);
+ freeaddrinfo(info);
+
+ if (toys.optflags & FLAG_g) file_get();
+ if (toys.optflags & FLAG_p) file_put();
+}
projects / platform / upstream / toybox.git / commitdiff