X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Ftftp.c;h=ce48a1edd5f5089f5a68ea3467c9b5d8f59465c9;hb=3a9365e2732f5df2cdef758bc1f6e5e9da8fbcef;hp=14c340b2229c3cb2c44a635e5d08c8d8ae692072;hpb=68404f13d4bf4826e3609703dad5375763db28ab;p=oweals%2Fbusybox.git diff --git a/networking/tftp.c b/networking/tftp.c index 14c340b22..ce48a1edd 100644 --- a/networking/tftp.c +++ b/networking/tftp.c @@ -1,8 +1,6 @@ /* vi: set sw=4 ts=4: */ -/* ------------------------------------------------------------------------- - * tftp.c - * - * A simple tftp client for busybox. +/* + * A simple tftp client/server for busybox. * Tries to follow RFC1350. * Only "octet" mode supported. * Optional blocksize negotiation (RFC2347 + RFC2348) @@ -16,17 +14,53 @@ * * utftp: Copyright (C) 1999 Uwe Ohse * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. - * ------------------------------------------------------------------------- */ + * tftpd added by Denys Vlasenko & Vladimir Dronnikov + * + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +//usage:#define tftp_trivial_usage +//usage: "[OPTIONS] HOST [PORT]" +//usage:#define tftp_full_usage "\n\n" +//usage: "Transfer a file from/to tftp server\n" +//usage: "\n -l FILE Local FILE" +//usage: "\n -r FILE Remote FILE" +//usage: IF_FEATURE_TFTP_GET( +//usage: "\n -g Get file" +//usage: ) +//usage: IF_FEATURE_TFTP_PUT( +//usage: "\n -p Put file" +//usage: ) +//usage: IF_FEATURE_TFTP_BLOCKSIZE( +//usage: "\n -b SIZE Transfer blocks of SIZE octets" +//usage: ) +//usage: +//usage:#define tftpd_trivial_usage +//usage: "[-cr] [-u USER] [DIR]" +//usage:#define tftpd_full_usage "\n\n" +//usage: "Transfer a file on tftp client's request\n" +//usage: "\n" +//usage: "tftpd should be used as an inetd service.\n" +//usage: "tftpd's line for inetd.conf:\n" +//usage: " 69 dgram udp nowait root tftpd tftpd -l /files/to/serve\n" +//usage: "It also can be ran from udpsvd:\n" +//usage: " udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve\n" +//usage: "\n -r Prohibit upload" +//usage: "\n -c Allow file creation via upload" +//usage: "\n -u Access files as USER" +//usage: "\n -l Log to syslog (inetd mode requires this)" #include "libbb.h" +#include #if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT -#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */ -#define TFTP_TIMEOUT_MS 50 -#define TFTP_MAXTIMEOUT_MS 2000 -#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */ +#define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */ +#define TFTP_BLKSIZE_DEFAULT_STR "512" +/* Was 50 ms but users asked to bump it up a bit */ +#define TFTP_TIMEOUT_MS 100 +#define TFTP_MAXTIMEOUT_MS 2000 +#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */ /* opcodes we support */ #define TFTP_RRQ 1 @@ -36,53 +70,129 @@ #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, + TFTPD_OPT_l = (1 << 11) * ENABLE_TFTPD, +}; + #if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT -#define USE_GETPUT(...) +#define IF_GETPUT(...) #define CMD_GET(cmd) 1 #define CMD_PUT(cmd) 0 #elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT -#define USE_GETPUT(...) +#define IF_GETPUT(...) #define CMD_GET(cmd) 0 #define CMD_PUT(cmd) 1 #else -#define USE_GETPUT(...) __VA_ARGS__ -/* masks coming from getpot32 */ -#define CMD_GET(cmd) ((cmd) & 1) -#define CMD_PUT(cmd) ((cmd) & 2) +#define IF_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]; +#if ENABLE_FEATURE_TFTP_PROGRESS_BAR + off_t pos; + off_t size; + const char *file; + bb_progress_t pmt; +#endif +} FIX_ALIASING; +#define G (*(struct globals*)&bb_common_bufsiz1) +struct BUG_G_too_big { + char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1]; +}; +#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_PROGRESS_BAR +static void tftp_progress_update(void) +{ + bb_progress_update(&G.pmt, 0, G.pos, G.size); +} +static void tftp_progress_init(void) +{ + bb_progress_init(&G.pmt, G.file); + tftp_progress_update(); +} +static void tftp_progress_done(void) +{ + if (is_bb_progress_inited(&G.pmt)) { + tftp_progress_update(); + bb_putchar_stderr('\n'); + bb_progress_free(&G.pmt); + } +} +#else +# define tftp_progress_init() ((void)0) +# define tftp_progress_done() ((void)0) +#endif + #if ENABLE_FEATURE_TFTP_BLOCKSIZE -static int tftp_blocksize_check(int blocksize, int bufsize) +static int tftp_blksize_check(const char *blksize_str, int maxsize) { - /* Check if the blocksize is valid: + /* Check if the blksize is valid: * RFC2348 says between 8 and 65464, * but our implementation makes it impossible - * to use blocksizes smaller than 22 octets. - */ - - if ((bufsize && (blocksize > bufsize)) - || (blocksize < 8) || (blocksize > 65564) + * 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"); - return 0; + bb_error_msg("bad blocksize '%s'", blksize_str); + return -1; } - - return blocksize; +# if ENABLE_TFTP_DEBUG + bb_error_msg("using blksize %u", blksize); +# endif + return blksize; } -static char *tftp_option_get(char *buf, int len, const char *option) +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_nameopt_valopt_name2opt_val2..." */ + while (len > 0) { - /* Make sure the options are terminated correctly */ + /* Make sure options are terminated correctly */ for (k = 0; k < len; k++) { if (buf[k] == '\0') { goto nul_found; @@ -90,7 +200,7 @@ static char *tftp_option_get(char *buf, int len, const char *option) } return NULL; nul_found: - if (opt_val == 0) { + if (opt_val == 0) { /* it's "name" part */ if (strcasecmp(buf, option) == 0) { opt_found = 1; } @@ -109,77 +219,226 @@ static char *tftp_option_get(char *buf, int len, const char *option) #endif -static int tftp( USE_GETPUT(const int cmd,) +static int tftp_protocol( + /* NULL if tftp, !NULL if tftpd: */ + len_and_sockaddr *our_lsa, len_and_sockaddr *peer_lsa, - const char *remotefile, const int localfd, - unsigned port, int tftp_bufsize) + const char *local_file + IF_TFTP(, const char *remote_file) +#if !ENABLE_TFTP +# define remote_file NULL +#endif + /* 1 for tftp; 1/0 for tftpd depending whether client asked about it: */ + IF_FEATURE_TFTP_BLOCKSIZE(, int want_transfer_size) + IF_FEATURE_TFTP_BLOCKSIZE(, int blksize)) { +#if !ENABLE_FEATURE_TFTP_BLOCKSIZE + enum { blksize = TFTP_BLKSIZE_DEFAULT }; +#endif + struct pollfd pfd[1]; -#define socketfd (pfd[0].fd) +#define socket_fd (pfd[0].fd) int len; int send_len; - USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;) + IF_FEATURE_TFTP_BLOCKSIZE(smallint expect_OACK = 0;) smallint finished = 0; uint16_t opcode; - uint16_t block_nr = 1; + uint16_t block_nr; uint16_t recv_blk; + int open_mode, local_fd; int retries, waittime_ms; + int io_bufsize = blksize + 4; char *cp; - - unsigned org_port; - len_and_sockaddr *const from = alloca(LSA_LEN_SIZE + peer_lsa->len); - /* 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(tftp_bufsize += 4); - char *rbuf = xmalloc(tftp_bufsize); - - port = org_port = htons(port); - - socketfd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0); + * size varies meaning BUFFERS_GO_ON_STACK would fail. + * + * We must keep the transmit and receive buffers separate + * in case we rcv a garbage pkt - 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); + + 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 (user_opt) { + struct passwd *pw = xgetpwnam(user_opt); + change_identity(pw); /* initgroups, setgid, setuid */ + } + } - /* build opcode */ - opcode = TFTP_WRQ; - if (CMD_GET(cmd)) { - opcode = TFTP_RRQ; + /* Prepare open mode */ + 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 } + + /* Examples of network traffic. + * Note two cases when ACKs with block# of 0 are sent. + * + * Download without options: + * tftp -> "\0\1FILENAME\0octet\0" + * "\0\3\0\1FILEDATA..." <- tftpd + * tftp -> "\0\4\0\1" + * ... + * Download with option of blksize 16384: + * tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0" + * "\0\6blksize\00016384\0" <- tftpd + * tftp -> "\0\4\0\0" + * "\0\3\0\1FILEDATA..." <- tftpd + * tftp -> "\0\4\0\1" + * ... + * Upload without options: + * tftp -> "\0\2FILENAME\0octet\0" + * "\0\4\0\0" <- tftpd + * tftp -> "\0\3\0\1FILEDATA..." + * "\0\4\0\1" <- tftpd + * ... + * Upload with option of blksize 16384: + * tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0" + * "\0\6blksize\00016384\0" <- tftpd + * tftp -> "\0\3\0\1FILEDATA..." + * "\0\4\0\1" <- tftpd + * ... + */ + block_nr = 1; cp = xbuf + 2; - /* add filename and mode */ - /* fill in packet if the filename fits into xbuf */ - len = strlen(remotefile) + 1; - if (2 + len + sizeof("octet") >= tftp_bufsize) { - bb_error_msg("remote filename is too long"); - goto ret; - } - strcpy(cp, remotefile); - cp += len; - /* add "mode" part of the package */ - strcpy(cp, "octet"); - cp += sizeof("octet"); + if (!ENABLE_TFTP || our_lsa) { /* tftpd */ + /* Open file (must be after changing user) */ + local_fd = open(local_file, open_mode, 0666); + if (local_fd < 0) { + error_pkt_reason = ERR_NOFILE; + strcpy((char*)error_pkt_str, "can't open file"); + goto send_err_pkt; + } +/* gcc 4.3.1 would NOT optimize it out as it should! */ #if ENABLE_FEATURE_TFTP_BLOCKSIZE - len = tftp_bufsize - 4; /* data block size */ - if (len != TFTP_BLOCKSIZE_DEFAULT) { - /* rfc2348 says that 65464 is a max allowed value */ - if ((&xbuf[tftp_bufsize - 1] - cp) < sizeof("blksize NNNNN")) { + if (blksize != TFTP_BLKSIZE_DEFAULT || want_transfer_size) { + /* 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 + if (CMD_GET(option_mask32)) { + /* It's upload and we don't send OACK. + * We must ACK 1st packet (with filename) + * as if it is "block 0" */ + block_nr = 0; + } + + } else { /* tftp */ + /* Open file (must be after changing user) */ + local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO; + if (NOT_LONE_DASH(local_file)) + local_fd = xopen(local_file, open_mode); +/* Removing #if, 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; } - /* add "blksize", , blocksize */ - strcpy(cp, "blksize"); - cp += sizeof("blksize"); - cp += snprintf(cp, 6, "%d", len) + 1; - want_option_ack = 1; - } + strcpy(cp, remote_file); + cp += len; + /* add "mode" part of the packet */ + strcpy(cp, "octet"); + cp += sizeof("octet"); + +# if ENABLE_FEATURE_TFTP_BLOCKSIZE + if (blksize == TFTP_BLKSIZE_DEFAULT && !want_transfer_size) + goto send_pkt; + + /* Need to add option to pkt */ + if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN tsize ") + sizeof(off_t)*3) { + bb_error_msg("remote filename is too long"); + goto ret; + } + expect_OACK = 1; +# endif +#endif /* ENABLE_TFTP */ + +#if ENABLE_FEATURE_TFTP_BLOCKSIZE + add_blksize_opt: + if (blksize != TFTP_BLKSIZE_DEFAULT) { + /* add "blksize", , blksize, */ + strcpy(cp, "blksize"); + cp += sizeof("blksize"); + cp += snprintf(cp, 6, "%d", blksize) + 1; + } + if (want_transfer_size) { + /* add "tsize", , size, (see RFC2349) */ + /* if tftp and downloading, we send "0" (since we opened local_fd with O_TRUNC) + * and this makes server to send "tsize" option with the size */ + /* if tftp and uploading, we send file size (maybe dont, to not confuse old servers???) */ + /* if tftpd and downloading, we are answering to client's request */ + /* if tftpd and uploading: !want_transfer_size, this code is not executed */ + struct stat st; + strcpy(cp, "tsize"); + cp += sizeof("tsize"); + st.st_size = 0; + fstat(local_fd, &st); + cp += sprintf(cp, "%"OFF_FMT"u", (off_t)st.st_size) + 1; +# if ENABLE_FEATURE_TFTP_PROGRESS_BAR + /* Save for progress bar. If 0 (tftp downloading), + * we look at server's reply later */ + G.size = st.st_size; + if (remote_file && st.st_size) + tftp_progress_init(); +# endif + } #endif - /* First packet is built, so skip packet generation */ - goto send_pkt; + /* 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; @@ -187,17 +446,17 @@ static int tftp( USE_GETPUT(const int cmd,) cp += 2; block_nr++; opcode = TFTP_ACK; - if (CMD_PUT(cmd)) { + if (CMD_PUT(option_mask32)) { opcode = TFTP_DATA; - len = full_read(localfd, cp, tftp_bufsize - 4); + len = full_read(local_fd, cp, blksize); if (len < 0) { - bb_perror_msg(bb_msg_read_error); - goto ret; + goto send_read_err_pkt; } - if (len != (tftp_bufsize - 4)) { + if (len != blksize) { finished = 1; } cp += len; + IF_FEATURE_TFTP_PROGRESS_BAR(G.pos += len;) } send_pkt: /* Send packet */ @@ -206,52 +465,40 @@ static int tftp( USE_GETPUT(const int cmd,) /* NB: send_len value is preserved in code below * for potential resend */ - retries = TFTP_NUM_RETRIES; /* re-initialize */ + retries = TFTP_NUM_RETRIES; /* re-initialize */ waittime_ms = TFTP_TIMEOUT_MS; send_again: -#if ENABLE_DEBUG_TFTP +#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(socketfd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len); + xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len); + +#if ENABLE_FEATURE_TFTP_PROGRESS_BAR + if (is_bb_progress_inited(&G.pmt)) + tftp_progress_update(); +#endif /* Was it final ACK? then exit */ if (finished && (opcode == TFTP_ACK)) goto ret; recv_again: /* Receive packet */ - /*pfd[0].fd = socketfd;*/ + /*pfd[0].fd = socket_fd;*/ pfd[0].events = POLLIN; switch (safe_poll(pfd, 1, waittime_ms)) { - unsigned from_port; - case 1: - from->len = peer_lsa->len; - memset(&from->u.sa, 0, peer_lsa->len); - len = recvfrom(socketfd, rbuf, tftp_bufsize, 0, - &from->u.sa, &from->len); - if (len < 0) { - bb_perror_msg("recvfrom"); - goto ret; - } - from_port = get_nport(&from->u.sa); - if (port == org_port) { - /* Our first query went to port 69 - * but reply will come from different one. - * Remember and use this new port */ - port = from_port; - set_nport(peer_lsa, from_port); - } - if (port != from_port) - goto recv_again; - goto process_pkt; + default: + /*bb_perror_msg("poll"); - done in safe_poll */ + goto ret; case 0: retries--; if (retries == 0) { + tftp_progress_done(); bb_error_msg("timeout"); - goto ret; + goto ret; /* no err packet sent */ } /* exponential backoff with limit */ @@ -261,109 +508,134 @@ static int tftp( USE_GETPUT(const int cmd,) } goto send_again; /* resend last sent pkt */ - default: - /*bb_perror_msg("poll"); - done in safe_poll */ - goto ret; + 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_pkt: + /* Process recv'ed packet */ opcode = ntohs( ((uint16_t*)rbuf)[0] ); recv_blk = ntohs( ((uint16_t*)rbuf)[1] ); - -#if ENABLE_DEBUG_TFTP +#if ENABLE_TFTP_DEBUG fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk); #endif - if (opcode == TFTP_ERROR) { - static const char *const errcode_str[] = { - "", - "file not found", - "access violation", - "disk full", - "illegal TFTP operation", - "unknown transfer id", - "file already exists", - "no such user", - "bad option" - }; + 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 (rbuf[4] != '\0') { + if (len > 4 && rbuf[4] != '\0') { msg = &rbuf[4]; - rbuf[tftp_bufsize - 1] = '\0'; - } else if (recv_blk < ARRAY_SIZE(errcode_str)) { - msg = errcode_str[recv_blk]; + 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 (expect_OACK) { + expect_OACK = 0; if (opcode == TFTP_OACK) { /* server seems to support options */ char *res; - res = tftp_option_get(&rbuf[2], len - 2, "blksize"); + res = tftp_get_option("blksize", &rbuf[2], len - 2); if (res) { - int blksize = xatoi_u(res); - if (!tftp_blocksize_check(blksize, tftp_bufsize - 4)) { - /* send ERROR 8 to server... */ - /* htons can be impossible to use in const initializer: */ - /*static const uint16_t error_8[2] = { htons(TFTP_ERROR), htons(8) };*/ - /* thus we open-code big-endian layout */ - static const uint8_t error_8[4] = { 0,TFTP_ERROR, 0,8 }; - xsendto(socketfd, error_8, 4, &peer_lsa->u.sa, peer_lsa->len); - bb_error_msg("server proposes bad blksize %d, exiting", blksize); - goto ret; + blksize = tftp_blksize_check(res, blksize); + if (blksize < 0) { + error_pkt_reason = ERR_BAD_OPT; + goto send_err_pkt; } -#if ENABLE_DEBUG_TFTP - fprintf(stderr, "using blksize %u\n", - blksize); -#endif - tftp_bufsize = blksize + 4; - /* Send ACK for OACK ("block" no: 0) */ + io_bufsize = blksize + 4; + } +# if ENABLE_FEATURE_TFTP_PROGRESS_BAR + if (remote_file && G.size == 0) { /* if we don't know it yet */ + res = tftp_get_option("tsize", &rbuf[2], len - 2); + if (res) { + G.size = bb_strtoull(res, NULL, 10); + if (G.size) + tftp_progress_init(); + } + } +# endif + if (CMD_GET(option_mask32)) { + /* We'll send ACK for OACK, + * such ACK has "block no" of 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." */ + continue; } - - bb_error_msg("blksize is not supported by server" - " - reverting to 512"); - tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4; + /* rfc2347: + * "An option not acknowledged by the server + * must be ignored by the client and server + * as if it were never requested." */ + if (blksize != TFTP_BLKSIZE_DEFAULT) + bb_error_msg("falling back to blocksize "TFTP_BLKSIZE_DEFAULT_STR); + 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(cmd) && (opcode == TFTP_DATA)) { + if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) { if (recv_blk == block_nr) { - len = full_write(localfd, &rbuf[4], len - 4); - if (len < 0) { - bb_perror_msg(bb_msg_write_error); - goto ret; + 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 (len != (tftp_bufsize - 4)) { + if (sz != blksize) { finished = 1; } + IF_FEATURE_TFTP_PROGRESS_BAR(G.pos += sz;) continue; /* send ACK */ } +/* Disabled to cope with servers with Sorcerer's Apprentice Syndrome */ +#if 0 if (recv_blk == (block_nr - 1)) { /* Server lost our TFTP_ACK. Resend it */ block_nr = recv_blk; continue; } +#endif } - if (CMD_PUT(cmd) && (opcode == TFTP_ACK)) { - /* did server ACK our last DATA pkt? */ + 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; @@ -381,86 +653,227 @@ static int tftp( USE_GETPUT(const int cmd,) * See: * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome */ - } + } /* end of "while (1)" */ ret: if (ENABLE_FEATURE_CLEAN_UP) { - close(socketfd); + 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("%s", (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 } +#if ENABLE_TFTP + int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; -int tftp_main(int argc ATTRIBUTE_UNUSED, char **argv) +int tftp_main(int argc UNUSED_PARAM, char **argv) { len_and_sockaddr *peer_lsa; - const char *localfile = NULL; - const char *remotefile = NULL; -#if ENABLE_FEATURE_TFTP_BLOCKSIZE - const char *sblocksize = NULL; -#endif - int port; - USE_GETPUT(int cmd;) - int fd = -1; - int flags = 0; + 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 blocksize = TFTP_BLOCKSIZE_DEFAULT; + int port; + IF_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(cmd =) getopt32(argv, - USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p") - "l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"), - &localfile, &remotefile - USE_FEATURE_TFTP_BLOCKSIZE(, &sblocksize)); + opt_complementary = "" IF_FEATURE_TFTP_GET("g:") IF_FEATURE_TFTP_PUT("p:") + IF_GETPUT("g--p:p--g:"); + + IF_GETPUT(opt =) getopt32(argv, + IF_FEATURE_TFTP_GET("g") IF_FEATURE_TFTP_PUT("p") + "l:r:" IF_FEATURE_TFTP_BLOCKSIZE("b:"), + &local_file, &remote_file + IF_FEATURE_TFTP_BLOCKSIZE(, &blksize_str)); argv += optind; - flags = O_RDONLY; - if (CMD_GET(cmd)) - flags = O_WRONLY | O_CREAT | O_TRUNC; +# 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 ENABLE_FEATURE_TFTP_BLOCKSIZE - if (sblocksize) { - blocksize = xatoi_u(sblocksize); - if (!tftp_blocksize_check(blocksize, 0)) { - return EXIT_FAILURE; + if (remote_file) { + if (!local_file) { + const char *slash = strrchr(remote_file, '/'); + local_file = slash ? slash + 1 : remote_file; } + } else { + remote_file = local_file; } -#endif - if (!localfile) - localfile = remotefile; - if (!remotefile) - remotefile = localfile; /* Error if filename or host is not known */ - if (!remotefile || !argv[0]) + if (!remote_file || !argv[0]) bb_show_usage(); - fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO; - if (!LONE_DASH(localfile)) { - fd = xopen(localfile, flags); - } - port = bb_lookup_port(argv[1], "udp", 69); peer_lsa = xhost2sockaddr(argv[0], port); -#if ENABLE_DEBUG_TFTP - fprintf(stderr, "using server '%s', remotefile '%s', localfile '%s'\n", +# if ENABLE_TFTP_DEBUG + fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n", xmalloc_sockaddr2dotted(&peer_lsa->u.sa), - remotefile, localfile); -#endif + remote_file, local_file); +# endif + +# if ENABLE_FEATURE_TFTP_PROGRESS_BAR + G.file = remote_file; +# endif + result = tftp_protocol( + NULL /*our_lsa*/, peer_lsa, + local_file, remote_file + IF_FEATURE_TFTP_BLOCKSIZE(, 1 /* want_transfer_size */) + IF_FEATURE_TFTP_BLOCKSIZE(, blksize) + ); + tftp_progress_done(); + + if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) { + unlink(local_file); + } + return result; +} + +#endif /* ENABLE_TFTP */ - result = tftp( USE_GETPUT(cmd,) peer_lsa, remotefile, fd, port, blocksize); +#if ENABLE_TFTPD +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; + IF_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;) + IF_FEATURE_TFTP_BLOCKSIZE(int want_transfer_size = 0;) + + 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:l", &user_opt) << 8); + argv += optind; + if (opt & TFTPD_OPT_l) { + openlog(applet_name, LOG_PID, LOG_DAEMON); + logmode = LOGMODE_SYSLOG; + } + if (argv[0]) { + xchroot(argv[0]); + } - if (ENABLE_FEATURE_CLEAN_UP) - close(fd); - if (result != EXIT_SUCCESS && !LONE_DASH(localfile) && CMD_GET(cmd)) { - unlink(localfile); + 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' + || (IF_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */ + IF_GETPUT(&&) + IF_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; + /* RFC 1350 says mode string is case independent */ + if (mode >= block_buf + result || strcasecmp(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; + } + } + if (opcode != TFTP_WRQ /* download? */ + /* did client ask us about file size? */ + && tftp_get_option("tsize", opt_str, opt_len) + ) { + want_transfer_size = 1; + } + } + } +# 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; + } + IF_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */ + } else { + IF_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 IF_TFTP(, NULL /*remote_file*/) + IF_FEATURE_TFTP_BLOCKSIZE(, want_transfer_size) + IF_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 */