diff options
Diffstat (limited to 'networking/tftp.c')
| -rw-r--r-- | networking/tftp.c | 752 |
1 files changed, 752 insertions, 0 deletions
diff --git a/networking/tftp.c b/networking/tftp.c new file mode 100644 index 0000000..1f70685 --- /dev/null +++ b/networking/tftp.c @@ -0,0 +1,752 @@ +/* vi: set sw=4 ts=4: */ +/* ------------------------------------------------------------------------- + * tftp.c + * + * A simple tftp client/server for busybox. + * Tries to follow RFC1350. + * Only "octet" mode supported. + * Optional blocksize negotiation (RFC2347 + RFC2348) + * + * Copyright (C) 2001 Magnus Damm <damm@opensource.se> + * + * Parts of the code based on: + * + * atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca> + * and Remi Lefebvre <remi@debian.org> + * + * utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de> + * + * tftpd added by Denys Vlasenko & Vladimir Dronnikov + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * ------------------------------------------------------------------------- */ + +#include "libbb.h" + +#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT + +#define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */ +#define TFTP_BLKSIZE_DEFAULT_STR "512" +#define TFTP_TIMEOUT_MS 50 +#define TFTP_MAXTIMEOUT_MS 2000 +#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */ + +/* opcodes we support */ +#define TFTP_RRQ 1 +#define TFTP_WRQ 2 +#define TFTP_DATA 3 +#define TFTP_ACK 4 +#define TFTP_ERROR 5 +#define TFTP_OACK 6 + +/* error codes sent over network (we use only 0, 1, 3 and 8) */ +/* generic (error message is included in the packet) */ +#define ERR_UNSPEC 0 +#define ERR_NOFILE 1 +#define ERR_ACCESS 2 +/* disk full or allocation exceeded */ +#define ERR_WRITE 3 +#define ERR_OP 4 +#define ERR_BAD_ID 5 +#define ERR_EXIST 6 +#define ERR_BAD_USER 7 +#define ERR_BAD_OPT 8 + +/* masks coming from getopt32 */ +enum { + TFTP_OPT_GET = (1 << 0), + TFTP_OPT_PUT = (1 << 1), + /* pseudo option: if set, it's tftpd */ + TFTPD_OPT = (1 << 7) * ENABLE_TFTPD, + TFTPD_OPT_r = (1 << 8) * ENABLE_TFTPD, + TFTPD_OPT_c = (1 << 9) * ENABLE_TFTPD, + TFTPD_OPT_u = (1 << 10) * ENABLE_TFTPD, +}; + +#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT +#define USE_GETPUT(...) +#define CMD_GET(cmd) 1 +#define CMD_PUT(cmd) 0 +#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT +#define USE_GETPUT(...) +#define CMD_GET(cmd) 0 +#define CMD_PUT(cmd) 1 +#else +#define USE_GETPUT(...) __VA_ARGS__ +#define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET) +#define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT) +#endif +/* NB: in the code below + * CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive + */ + + +struct globals { + /* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */ + uint8_t error_pkt[4 + 32]; + char *user_opt; + /* used in tftpd_main(), a bit big for stack: */ + char block_buf[TFTP_BLKSIZE_DEFAULT]; +}; +#define G (*(struct globals*)&bb_common_bufsiz1) +#define block_buf (G.block_buf ) +#define user_opt (G.user_opt ) +#define error_pkt (G.error_pkt ) +#define INIT_G() do { } while (0) + +#define error_pkt_reason (error_pkt[3]) +#define error_pkt_str (error_pkt + 4) + + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + +static int tftp_blksize_check(const char *blksize_str, int maxsize) +{ + /* Check if the blksize is valid: + * RFC2348 says between 8 and 65464, + * but our implementation makes it impossible + * to use blksizes smaller than 22 octets. */ + unsigned blksize = bb_strtou(blksize_str, NULL, 10); + if (errno + || (blksize < 24) || (blksize > maxsize) + ) { + bb_error_msg("bad blocksize '%s'", blksize_str); + return -1; + } +#if ENABLE_TFTP_DEBUG + bb_error_msg("using blksize %u", blksize); +#endif + return blksize; +} + +static char *tftp_get_option(const char *option, char *buf, int len) +{ + int opt_val = 0; + int opt_found = 0; + int k; + + /* buf points to: + * "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */ + + while (len > 0) { + /* Make sure options are terminated correctly */ + for (k = 0; k < len; k++) { + if (buf[k] == '\0') { + goto nul_found; + } + } + return NULL; + nul_found: + if (opt_val == 0) { /* it's "name" part */ + if (strcasecmp(buf, option) == 0) { + opt_found = 1; + } + } else if (opt_found) { + return buf; + } + + k++; + buf += k; + len -= k; + opt_val ^= 1; + } + + return NULL; +} + +#endif + +static int tftp_protocol( + len_and_sockaddr *our_lsa, + len_and_sockaddr *peer_lsa, + const char *local_file + USE_TFTP(, const char *remote_file) + USE_FEATURE_TFTP_BLOCKSIZE(USE_TFTPD(, void *tsize)) + USE_FEATURE_TFTP_BLOCKSIZE(, int blksize)) +{ +#if !ENABLE_TFTP +#define remote_file NULL +#endif +#if !(ENABLE_FEATURE_TFTP_BLOCKSIZE && ENABLE_TFTPD) +#define tsize NULL +#endif +#if !ENABLE_FEATURE_TFTP_BLOCKSIZE + enum { blksize = TFTP_BLKSIZE_DEFAULT }; +#endif + + struct pollfd pfd[1]; +#define socket_fd (pfd[0].fd) + int len; + int send_len; + USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;) + smallint finished = 0; + uint16_t opcode; + uint16_t block_nr; + uint16_t recv_blk; + int open_mode, local_fd; + int retries, waittime_ms; + int io_bufsize = blksize + 4; + char *cp; + /* Can't use RESERVE_CONFIG_BUFFER here since the allocation + * size varies meaning BUFFERS_GO_ON_STACK would fail */ + /* We must keep the transmit and receive buffers seperate */ + /* In case we rcv a garbage pkt and we need to rexmit the last pkt */ + char *xbuf = xmalloc(io_bufsize); + char *rbuf = xmalloc(io_bufsize); + + socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0); + setsockopt_reuseaddr(socket_fd); + + block_nr = 1; + cp = xbuf + 2; + + if (!ENABLE_TFTP || our_lsa) { + /* tftpd */ + + /* Create a socket which is: + * 1. bound to IP:port peer sent 1st datagram to, + * 2. connected to peer's IP:port + * This way we will answer from the IP:port peer + * expects, will not get any other packets on + * the socket, and also plain read/write will work. */ + xbind(socket_fd, &our_lsa->u.sa, our_lsa->len); + xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len); + + /* Is there an error already? Send pkt and bail out */ + if (error_pkt_reason || error_pkt_str[0]) + goto send_err_pkt; + + if (CMD_GET(option_mask32)) { + /* it's upload - we must ACK 1st packet (with filename) + * as if it's "block 0" */ + block_nr = 0; + } + + if (user_opt) { + struct passwd *pw = getpwnam(user_opt); + if (!pw) + bb_error_msg_and_die("unknown user %s", user_opt); + change_identity(pw); /* initgroups, setgid, setuid */ + } + } + + /* Open local file (must be after changing user) */ + if (CMD_PUT(option_mask32)) { + open_mode = O_RDONLY; + } else { + open_mode = O_WRONLY | O_TRUNC | O_CREAT; +#if ENABLE_TFTPD + if ((option_mask32 & (TFTPD_OPT+TFTPD_OPT_c)) == TFTPD_OPT) { + /* tftpd without -c */ + open_mode = O_WRONLY | O_TRUNC; + } +#endif + } + if (!(option_mask32 & TFTPD_OPT)) { + local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO; + if (NOT_LONE_DASH(local_file)) + local_fd = xopen(local_file, open_mode); + } else { + local_fd = open(local_file, open_mode); + if (local_fd < 0) { + error_pkt_reason = ERR_NOFILE; + strcpy((char*)error_pkt_str, "can't open file"); + goto send_err_pkt; + } + } + + if (!ENABLE_TFTP || our_lsa) { +/* gcc 4.3.1 would NOT optimize it out as it should! */ +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + if (blksize != TFTP_BLKSIZE_DEFAULT || tsize) { + /* Create and send OACK packet. */ + /* For the download case, block_nr is still 1 - + * we expect 1st ACK from peer to be for (block_nr-1), + * that is, for "block 0" which is our OACK pkt */ + opcode = TFTP_OACK; + goto add_blksize_opt; + } +#endif + } else { +/* Removing it, or using if() statement instead of #if may lead to + * "warning: null argument where non-null required": */ +#if ENABLE_TFTP + /* tftp */ + + /* We can't (and don't really need to) bind the socket: + * we don't know from which local IP datagrams will be sent, + * but kernel will pick the same IP every time (unless routing + * table is changed), thus peer will see dgrams consistently + * coming from the same IP. + * We would like to connect the socket, but since peer's + * UDP code can be less perfect than ours, _peer's_ IP:port + * in replies may differ from IP:port we used to send + * our first packet. We can connect() only when we get + * first reply. */ + + /* build opcode */ + opcode = TFTP_WRQ; + if (CMD_GET(option_mask32)) { + opcode = TFTP_RRQ; + } + /* add filename and mode */ + /* fill in packet if the filename fits into xbuf */ + len = strlen(remote_file) + 1; + if (2 + len + sizeof("octet") >= io_bufsize) { + bb_error_msg("remote filename is too long"); + goto ret; + } + strcpy(cp, remote_file); + cp += len; + /* add "mode" part of the package */ + strcpy(cp, "octet"); + cp += sizeof("octet"); + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + if (blksize == TFTP_BLKSIZE_DEFAULT) + goto send_pkt; + + /* Non-standard blocksize: add option to pkt */ + if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN")) { + bb_error_msg("remote filename is too long"); + goto ret; + } + want_option_ack = 1; +#endif +#endif /* ENABLE_TFTP */ + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + add_blksize_opt: +#if ENABLE_TFTPD + if (tsize) { + struct stat st; + /* add "tsize", <nul>, size, <nul> */ + strcpy(cp, "tsize"); + cp += sizeof("tsize"); + fstat(local_fd, &st); + cp += snprintf(cp, 10, "%u", (int) st.st_size) + 1; + } +#endif + if (blksize != TFTP_BLKSIZE_DEFAULT) { + /* add "blksize", <nul>, blksize, <nul> */ + strcpy(cp, "blksize"); + cp += sizeof("blksize"); + cp += snprintf(cp, 6, "%d", blksize) + 1; + } +#endif + /* First packet is built, so skip packet generation */ + goto send_pkt; + } + + /* Using mostly goto's - continue/break will be less clear + * in where we actually jump to */ + while (1) { + /* Build ACK or DATA */ + cp = xbuf + 2; + *((uint16_t*)cp) = htons(block_nr); + cp += 2; + block_nr++; + opcode = TFTP_ACK; + if (CMD_PUT(option_mask32)) { + opcode = TFTP_DATA; + len = full_read(local_fd, cp, blksize); + if (len < 0) { + goto send_read_err_pkt; + } + if (len != blksize) { + finished = 1; + } + cp += len; + } + send_pkt: + /* Send packet */ + *((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */ + send_len = cp - xbuf; + /* NB: send_len value is preserved in code below + * for potential resend */ + + retries = TFTP_NUM_RETRIES; /* re-initialize */ + waittime_ms = TFTP_TIMEOUT_MS; + + send_again: +#if ENABLE_TFTP_DEBUG + fprintf(stderr, "sending %u bytes\n", send_len); + for (cp = xbuf; cp < &xbuf[send_len]; cp++) + fprintf(stderr, "%02x ", (unsigned char) *cp); + fprintf(stderr, "\n"); +#endif + xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len); + /* Was it final ACK? then exit */ + if (finished && (opcode == TFTP_ACK)) + goto ret; + + recv_again: + /* Receive packet */ + /*pfd[0].fd = socket_fd;*/ + pfd[0].events = POLLIN; + switch (safe_poll(pfd, 1, waittime_ms)) { + default: + /*bb_perror_msg("poll"); - done in safe_poll */ + goto ret; + case 0: + retries--; + if (retries == 0) { + bb_error_msg("timeout"); + goto ret; /* no err packet sent */ + } + + /* exponential backoff with limit */ + waittime_ms += waittime_ms/2; + if (waittime_ms > TFTP_MAXTIMEOUT_MS) { + waittime_ms = TFTP_MAXTIMEOUT_MS; + } + + goto send_again; /* resend last sent pkt */ + case 1: + if (!our_lsa) { + /* tftp (not tftpd!) receiving 1st packet */ + our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */ + len = recvfrom(socket_fd, rbuf, io_bufsize, 0, + &peer_lsa->u.sa, &peer_lsa->len); + /* Our first dgram went to port 69 + * but reply may come from different one. + * Remember and use this new port (and IP) */ + if (len >= 0) + xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len); + } else { + /* tftpd, or not the very first packet: + * socket is connect()ed, can just read from it. */ + /* Don't full_read()! + * This is not TCP, one read == one pkt! */ + len = safe_read(socket_fd, rbuf, io_bufsize); + } + if (len < 0) { + goto send_read_err_pkt; + } + if (len < 4) { /* too small? */ + goto recv_again; + } + } + + /* Process recv'ed packet */ + opcode = ntohs( ((uint16_t*)rbuf)[0] ); + recv_blk = ntohs( ((uint16_t*)rbuf)[1] ); +#if ENABLE_TFTP_DEBUG + fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk); +#endif + if (opcode == TFTP_ERROR) { + static const char errcode_str[] ALIGN1 = + "\0" + "file not found\0" + "access violation\0" + "disk full\0" + "bad operation\0" + "unknown transfer id\0" + "file already exists\0" + "no such user\0" + "bad option"; + + const char *msg = ""; + + if (len > 4 && rbuf[4] != '\0') { + msg = &rbuf[4]; + rbuf[io_bufsize - 1] = '\0'; /* paranoia */ + } else if (recv_blk <= 8) { + msg = nth_string(errcode_str, recv_blk); + } + bb_error_msg("server error: (%u) %s", recv_blk, msg); + goto ret; + } + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + if (want_option_ack) { + want_option_ack = 0; + if (opcode == TFTP_OACK) { + /* server seems to support options */ + char *res; + + res = tftp_get_option("blksize", &rbuf[2], len - 2); + if (res) { + blksize = tftp_blksize_check(res, blksize); + if (blksize < 0) { + error_pkt_reason = ERR_BAD_OPT; + goto send_err_pkt; + } + io_bufsize = blksize + 4; + /* Send ACK for OACK ("block" no: 0) */ + block_nr = 0; + continue; + } + /* rfc2347: + * "An option not acknowledged by the server + * must be ignored by the client and server + * as if it were never requested." */ + } + bb_error_msg("server only supports blocksize of 512"); + blksize = TFTP_BLKSIZE_DEFAULT; + io_bufsize = TFTP_BLKSIZE_DEFAULT + 4; + } +#endif + /* block_nr is already advanced to next block# we expect + * to get / block# we are about to send next time */ + + if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) { + if (recv_blk == block_nr) { + int sz = full_write(local_fd, &rbuf[4], len - 4); + if (sz != len - 4) { + strcpy((char*)error_pkt_str, bb_msg_write_error); + error_pkt_reason = ERR_WRITE; + goto send_err_pkt; + } + if (sz != blksize) { + finished = 1; + } + continue; /* send ACK */ + } + if (recv_blk == (block_nr - 1)) { + /* Server lost our TFTP_ACK. Resend it */ + block_nr = recv_blk; + continue; + } + } + + if (CMD_PUT(option_mask32) && (opcode == TFTP_ACK)) { + /* did peer ACK our last DATA pkt? */ + if (recv_blk == (uint16_t) (block_nr - 1)) { + if (finished) + goto ret; + continue; /* send next block */ + } + } + /* Awww... recv'd packet is not recognized! */ + goto recv_again; + /* why recv_again? - rfc1123 says: + * "The sender (i.e., the side originating the DATA packets) + * must never resend the current DATA packet on receipt + * of a duplicate ACK". + * DATA pkts are resent ONLY on timeout. + * Thus "goto send_again" will ba a bad mistake above. + * See: + * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome + */ + } /* end of "while (1)" */ + ret: + if (ENABLE_FEATURE_CLEAN_UP) { + close(local_fd); + close(socket_fd); + free(xbuf); + free(rbuf); + } + return finished == 0; /* returns 1 on failure */ + + send_read_err_pkt: + strcpy((char*)error_pkt_str, bb_msg_read_error); + send_err_pkt: + if (error_pkt_str[0]) + bb_error_msg((char*)error_pkt_str); + error_pkt[1] = TFTP_ERROR; + xsendto(socket_fd, error_pkt, 4 + 1 + strlen((char*)error_pkt_str), + &peer_lsa->u.sa, peer_lsa->len); + return EXIT_FAILURE; +#undef remote_file +#undef tsize +} + +#if ENABLE_TFTP + +int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int tftp_main(int argc UNUSED_PARAM, char **argv) +{ + len_and_sockaddr *peer_lsa; + const char *local_file = NULL; + const char *remote_file = NULL; +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR; + int blksize; +#endif + int result; + int port; + USE_GETPUT(int opt;) + + INIT_G(); + + /* -p or -g is mandatory, and they are mutually exclusive */ + opt_complementary = "" USE_FEATURE_TFTP_GET("g:") USE_FEATURE_TFTP_PUT("p:") + USE_GETPUT("g--p:p--g:"); + + USE_GETPUT(opt =) getopt32(argv, + USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p") + "l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"), + &local_file, &remote_file + USE_FEATURE_TFTP_BLOCKSIZE(, &blksize_str)); + argv += optind; + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + /* Check if the blksize is valid: + * RFC2348 says between 8 and 65464 */ + blksize = tftp_blksize_check(blksize_str, 65564); + if (blksize < 0) { + //bb_error_msg("bad block size"); + return EXIT_FAILURE; + } +#endif + + if (!local_file) + local_file = remote_file; + if (!remote_file) + remote_file = local_file; + /* Error if filename or host is not known */ + if (!remote_file || !argv[0]) + bb_show_usage(); + + port = bb_lookup_port(argv[1], "udp", 69); + peer_lsa = xhost2sockaddr(argv[0], port); + +#if ENABLE_TFTP_DEBUG + fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n", + xmalloc_sockaddr2dotted(&peer_lsa->u.sa), + remote_file, local_file); +#endif + + result = tftp_protocol( + NULL /*our_lsa*/, peer_lsa, + local_file, remote_file + USE_FEATURE_TFTP_BLOCKSIZE(USE_TFTPD(, NULL /*tsize*/)) + USE_FEATURE_TFTP_BLOCKSIZE(, blksize) + ); + + if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) { + unlink(local_file); + } + return result; +} + +#endif /* ENABLE_TFTP */ + +#if ENABLE_TFTPD + +/* TODO: libbb candidate? */ +static len_and_sockaddr *get_sock_lsa(int s) +{ + len_and_sockaddr *lsa; + socklen_t len = 0; + + if (getsockname(s, NULL, &len) != 0) + return NULL; + lsa = xzalloc(LSA_LEN_SIZE + len); + lsa->len = len; + getsockname(s, &lsa->u.sa, &lsa->len); + return lsa; +} + +int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int tftpd_main(int argc UNUSED_PARAM, char **argv) +{ + len_and_sockaddr *our_lsa; + len_and_sockaddr *peer_lsa; + char *local_file, *mode; + const char *error_msg; + int opt, result, opcode; + USE_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;) + USE_FEATURE_TFTP_BLOCKSIZE(char *tsize = NULL;) + + INIT_G(); + + our_lsa = get_sock_lsa(STDIN_FILENO); + if (!our_lsa) { + /* This is confusing: + *bb_error_msg_and_die("stdin is not a socket"); + * Better: */ + bb_show_usage(); + /* Help text says that tftpd must be used as inetd service, + * which is by far the most usual cause of get_sock_lsa + * failure */ + } + peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len); + peer_lsa->len = our_lsa->len; + + /* Shifting to not collide with TFTP_OPTs */ + opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:", &user_opt) << 8); + argv += optind; + if (argv[0]) + xchdir(argv[0]); + + result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf), + 0 /* flags */, + &peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len); + + error_msg = "malformed packet"; + opcode = ntohs(*(uint16_t*)block_buf); + if (result < 4 || result >= sizeof(block_buf) + || block_buf[result-1] != '\0' + || (USE_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */ + USE_GETPUT(&&) + USE_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */ + ) + ) { + goto err; + } + local_file = block_buf + 2; + if (local_file[0] == '.' || strstr(local_file, "/.")) { + error_msg = "dot in file name"; + goto err; + } + mode = local_file + strlen(local_file) + 1; + if (mode >= block_buf + result || strcmp(mode, "octet") != 0) { + goto err; + } +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + { + char *res; + char *opt_str = mode + sizeof("octet"); + int opt_len = block_buf + result - opt_str; + if (opt_len > 0) { + res = tftp_get_option("blksize", opt_str, opt_len); + if (res) { + blksize = tftp_blksize_check(res, 65564); + if (blksize < 0) { + error_pkt_reason = ERR_BAD_OPT; + /* will just send error pkt */ + goto do_proto; + } + } + /* did client ask us about file size? */ + tsize = tftp_get_option("tsize", opt_str, opt_len); + } + } +#endif + + if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) { + if (opt & TFTPD_OPT_r) { + /* This would mean "disk full" - not true */ + /*error_pkt_reason = ERR_WRITE;*/ + error_msg = bb_msg_write_error; + goto err; + } + USE_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */ + } else { + USE_GETPUT(option_mask32 |= TFTP_OPT_PUT;) /* will send file's data */ + } + + /* NB: if error_pkt_str or error_pkt_reason is set up, + * tftp_protocol() just sends one error pkt and returns */ + + do_proto: + close(STDIN_FILENO); /* close old, possibly wildcard socket */ + /* tftp_protocol() will create new one, bound to particular local IP */ + result = tftp_protocol( + our_lsa, peer_lsa, + local_file USE_TFTP(, NULL /*remote_file*/) + USE_FEATURE_TFTP_BLOCKSIZE(, tsize) + USE_FEATURE_TFTP_BLOCKSIZE(, blksize) + ); + + return result; + err: + strcpy((char*)error_pkt_str, error_msg); + goto do_proto; +} + +#endif /* ENABLE_TFTPD */ + +#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */ |