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/***************************************************************************
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* Project ___| | | | _ \| |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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* $Id: tftpd.c,v 1.10 2005/12/06 07:47:37 bagder Exp $
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* Trivial file transfer protocol server.
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* This code includes many modifications by Jim Guyton <guyton@rand-unix>
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* This source file was started based on netkit-tftpd 0.17
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* Heavily modified for curl's test suite
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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#include "setup.h" /* portability help from the lib directory */
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#ifdef HAVE_SYS_STAT_H
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#ifdef HAVE_ARPA_TFTP_H
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#include <arpa/tftp.h>
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#ifdef HAVE_SYS_FILIO_H
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/* FIONREAD on Solaris 7 */
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#include <sys/filio.h>
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#define ENABLE_CURLX_PRINTF
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/* make the curlx header define all printf() functions to use the curlx_*
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#include "curlx.h" /* from the private lib dir */
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/* include memdebug.h last */
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#include "memdebug.h"
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char *buffer; /* holds the file data to send to the client */
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size_t bufsize; /* size of the data in buffer */
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char *rptr; /* read pointer into the buffer */
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size_t rcount; /* amount of data left to read of the file */
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long num; /* test case number */
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int ofile; /* file descriptor for output file when uploading to us */
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FILE *server; /* write input "protocol" there for client verification */
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static int synchnet(int);
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static struct tftphdr *r_init(void);
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static struct tftphdr *w_init(void);
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static int readit(struct testcase *test, struct tftphdr **dpp, int convert);
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static int writeit(struct testcase *test, struct tftphdr **dpp, int ct,
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static void mysignal(int, void (*func)(int));
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#define PKTSIZE SEGSIZE+4
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static int tftp(struct testcase *test, struct tftphdr *tp, int size);
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static void nak(int error);
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static void sendtftp(struct testcase *test, struct formats *pf);
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static void recvtftp(struct testcase *test, struct formats *pf);
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static int validate_access(struct testcase *test, const char *, int);
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static curl_socket_t peer;
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static int rexmtval = TIMEOUT;
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static int maxtimeout = 5*TIMEOUT;
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static char buf[PKTSIZE];
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static char ackbuf[PKTSIZE];
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static struct sockaddr_in from;
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static socklen_t fromlen;
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int counter; /* size of data in buffer, or flag */
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char buf[PKTSIZE]; /* room for data packet */
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/* Values for bf.counter */
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#define BF_ALLOC -3 /* alloc'd but not yet filled */
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#define BF_FREE -2 /* free */
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/* [-1 .. SEGSIZE] = size of data in the data buffer */
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static int nextone; /* index of next buffer to use */
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static int current; /* index of buffer in use */
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/* control flags for crlf conversions */
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int newline = 0; /* fillbuf: in middle of newline expansion */
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int prevchar = -1; /* putbuf: previous char (cr check) */
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static void read_ahead(struct testcase *test,
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int convert /* if true, convert to ascii */);
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static int write_behind(struct testcase *test, int convert);
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static struct tftphdr *rw_init(int);
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static struct tftphdr *w_init(void) { return rw_init(0); } /* write-behind */
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static struct tftphdr *r_init(void) { return rw_init(1); } /* read-ahead */
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static struct tftphdr *
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rw_init(int x) /* init for either read-ahead or write-behind */
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{ /* zero for write-behind, one for read-head */
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newline = 0; /* init crlf flag */
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bfs[0].counter = BF_ALLOC; /* pass out the first buffer */
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bfs[1].counter = BF_FREE;
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nextone = x; /* ahead or behind? */
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return (struct tftphdr *)bfs[0].buf;
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/* Have emptied current buffer by sending to net and getting ack.
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Free it and return next buffer filled with data.
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static int readit(struct testcase *test, struct tftphdr **dpp,
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int convert /* if true, convert to ascii */)
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bfs[current].counter = BF_FREE; /* free old one */
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current = !current; /* "incr" current */
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b = &bfs[current]; /* look at new buffer */
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if (b->counter == BF_FREE) /* if it's empty */
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read_ahead(test, convert); /* fill it */
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*dpp = (struct tftphdr *)b->buf; /* set caller's ptr */
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#undef MIN /* some systems have this defined already, some don't */
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#define MIN(x,y) ((x)<(y)?(x):(y));
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* fill the input buffer, doing ascii conversions if requested
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* conversions are lf -> cr,lf and cr -> cr, nul
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static void read_ahead(struct testcase *test,
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int convert /* if true, convert to ascii */)
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b = &bfs[nextone]; /* look at "next" buffer */
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if (b->counter != BF_FREE) /* nop if not free */
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nextone = !nextone; /* "incr" next buffer ptr */
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dp = (struct tftphdr *)b->buf;
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/* The former file reading code did this:
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b->counter = read(fileno(file), dp->th_data, SEGSIZE); */
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size_t copy_n = MIN(SEGSIZE, test->rcount);
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memcpy(dp->th_data, test->rptr, copy_n);
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/* decrease amount, advance pointer */
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test->rcount -= copy_n;
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test->rptr += copy_n;
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b->counter = (int)copy_n;
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for (i = 0 ; i < SEGSIZE; i++) {
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if (prevchar == '\n')
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c = '\n'; /* lf to cr,lf */
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c = '\0'; /* cr to cr,nul */
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if (c == '\n' || c == '\r') {
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b->counter = (int)(p - dp->th_data);
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/* Update count associated with the buffer, get new buffer from the queue.
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Calls write_behind only if next buffer not available.
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static int writeit(struct testcase *test, struct tftphdr **dpp,
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bfs[current].counter = ct; /* set size of data to write */
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current = !current; /* switch to other buffer */
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if (bfs[current].counter != BF_FREE) /* if not free */
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write_behind(test, convert); /* flush it */
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bfs[current].counter = BF_ALLOC; /* mark as alloc'd */
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*dpp = (struct tftphdr *)bfs[current].buf;
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return ct; /* this is a lie of course */
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* Output a buffer to a file, converting from netascii if requested.
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* CR,NUL -> CR and CR,LF => LF.
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* Note spec is undefined if we get CR as last byte of file or a
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* CR followed by anything else. In this case we leave it alone.
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static int write_behind(struct testcase *test, int convert)
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int c; /* current character */
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if (b->counter < -1) /* anything to flush? */
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return 0; /* just nop if nothing to do */
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snprintf(outfile, sizeof(outfile), "log/upload.%ld", test->num);
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test->ofile=open(outfile, O_CREAT|O_RDWR, 0777);
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if(test->ofile == -1) {
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logmsg("Couldn't create and/or open file %s for upload!", outfile);
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return -1; /* failure! */
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count = b->counter; /* remember byte count */
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b->counter = BF_FREE; /* reset flag */
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dp = (struct tftphdr *)b->buf;
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nextone = !nextone; /* incr for next time */
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return -1; /* nak logic? */
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return write(test->ofile, buf, count);
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while (ct--) { /* loop over the buffer */
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c = *p++; /* pick up a character */
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if (prevchar == '\r') { /* if prev char was cr */
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if (c == '\n') /* if have cr,lf then just */
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lseek(test->ofile, -1, SEEK_CUR); /* smash lf on top of the cr */
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if (c == '\0') /* if have cr,nul then */
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goto skipit; /* just skip over the putc */
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/* else just fall through and allow it */
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write(test->ofile, &c, 1);
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/* When an error has occurred, it is possible that the two sides are out of
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* synch. Ie: that what I think is the other side's response to packet N is
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* really their response to packet N-1.
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* So, to try to prevent that, we flush all the input queued up for us on the
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* network connection on our host.
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* We return the number of packets we flushed (mostly for reporting when trace
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static int synchnet(curl_socket_t f /* socket to flush */)
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struct sockaddr_in from;
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(void) ioctl(f, FIONREAD, &i);
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fromlen = sizeof from;
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(void) recvfrom(f, rbuf, sizeof (rbuf), 0,
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(struct sockaddr *)&from, &fromlen);
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* Like signal(), but with well-defined semantics.
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static void mysignal(int sig, void (*handler)(int))
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = handler;
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sigaction(sig, &sa, NULL);
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#ifndef DEFAULT_LOGFILE
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#define DEFAULT_LOGFILE "log/tftpd.log"
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#define DEFAULT_PORT 8999 /* UDP */
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const char *serverlogfile = DEFAULT_LOGFILE;
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#define REQUEST_DUMP "log/server.input"
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int main(int argc, char **argv)
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struct sockaddr_in me;
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struct sockaddr_in6 me6;
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#endif /* ENABLE_IPV6 */
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char *pidname= (char *)".tftpd.pid";
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unsigned short port = DEFAULT_PORT;
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struct testcase test;
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if(!strcmp("--version", argv[arg])) {
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printf("tftpd IPv4%s\n",
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else if(!strcmp("--pidfile", argv[arg])) {
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pidname = argv[arg++];
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else if(!strcmp("--ipv6", argv[arg])) {
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port = (unsigned short)atoi(argv[arg++]);
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#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
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atexit(win32_cleanup);
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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sock = socket(AF_INET6, SOCK_DGRAM, 0);
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perror("opening stream socket");
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logmsg("Error opening socket");
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(sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
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perror("setsockopt(SO_REUSEADDR)");
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me.sin_family = AF_INET;
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me.sin_addr.s_addr = INADDR_ANY;
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me.sin_port = htons(port);
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rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
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memset(&me6, 0, sizeof(struct sockaddr_in6));
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me6.sin6_family = AF_INET6;
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me6.sin6_addr = in6addr_any;
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me6.sin6_port = htons(port);
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rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
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#endif /* ENABLE_IPV6 */
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perror("binding stream socket");
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logmsg("Error binding socket");
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pidfile = fopen(pidname, "w");
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fprintf(pidfile, "%d\n", (int)getpid());
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fprintf(stderr, "Couldn't write pid file\n");
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logmsg("Running IPv%d version on port UDP/%d",
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fromlen = sizeof(from);
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n = recvfrom(sock, buf, sizeof (buf), 0,
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(struct sockaddr *)&from, &fromlen);
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logmsg("recvfrom:\n");
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from.sin_family = AF_INET;
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peer = socket(AF_INET, SOCK_DGRAM, 0);
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if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
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logmsg("connect: fail\n");
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maxtimeout = 5*TIMEOUT;
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tp = (struct tftphdr *)buf;
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tp->th_opcode = ntohs(tp->th_opcode);
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if (tp->th_opcode == RRQ || tp->th_opcode == WRQ) {
540
memset(&test, 0, sizeof(test));
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server = fopen(REQUEST_DUMP, "ab");
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test.server = server;
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* Handle initial connection protocol.
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static int tftp(struct testcase *test, struct tftphdr *tp, int size)
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int first = 1, ecode;
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char *filename, *mode = NULL;
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/* store input protocol */
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fprintf(test->server, "opcode: %x\n", tp->th_opcode);
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cp = (char *)&tp->th_stuff;
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while (cp < buf + size) {
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/* store input protocol */
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fprintf(test->server, "filename: %s\n", filename);
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for (cp = mode; *cp; cp++)
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if (isupper((int)*cp))
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*cp = tolower((int)*cp);
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/* store input protocol */
602
fprintf(test->server, "mode: %s\n", mode);
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for (pf = formats; pf->f_mode; pf++)
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if (strcmp(pf->f_mode, mode) == 0)
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ecode = validate_access(test, filename, tp->th_opcode);
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if (tp->th_opcode == WRQ)
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* Validate file access.
627
static int validate_access(struct testcase *test,
628
const char *filename, int mode)
633
logmsg("trying to get file: %s mode %x", filename, mode);
635
if(!strncmp("/verifiedserver", filename, 15)) {
637
size_t count = sprintf(weare, "WE ROOLZ: %d\r\n", (int)getpid());
639
logmsg("Are-we-friendly question received");
640
test->buffer = strdup(weare);
641
test->rptr = test->buffer; /* set read pointer */
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test->bufsize = count; /* set total count */
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test->rcount = count; /* set data left to read */
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/* find the last slash */
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ptr = strrchr(filename, '/');
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ptr++; /* skip the slash */
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/* skip all non-numericals following the slash */
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while(*ptr && !isdigit((int)*ptr))
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testno = strtol(ptr, &ptr, 10);
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logmsg("requested test number %d", testno);
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file = test2file(testno);
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FILE *stream=fopen(file, "rb");
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logmsg("Couldn't open test file: %s", file);
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test->buffer = (char *)spitout(stream, "reply", "data", &count);
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test->rptr = test->buffer; /* set read pointer */
680
test->bufsize = count; /* set total count */
681
test->rcount = count; /* set data left to read */
692
logmsg("no slash found in path");
693
return EACCESS; /* failure */
700
sigjmp_buf timeoutbuf;
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static void timer(int signum)
709
if (timeout >= maxtimeout)
711
siglongjmp(timeoutbuf, 1);
715
* Send the requested file.
717
static void sendtftp(struct testcase *test, struct formats *pf)
720
struct tftphdr *ap; /* ack packet */
721
unsigned short block = 1;
724
mysignal(SIGALRM, timer);
726
ap = (struct tftphdr *)ackbuf;
728
size = readit(test, &dp, pf->f_convert);
733
dp->th_opcode = htons((u_short)DATA);
734
dp->th_block = htons((u_short)block);
736
(void) sigsetjmp(timeoutbuf, 1);
739
if (send(peer, dp, size + 4, 0) != size + 4) {
743
read_ahead(test, pf->f_convert);
745
alarm(rexmtval); /* read the ack */
746
n = recv(peer, ackbuf, sizeof (ackbuf), 0);
749
logmsg("read: fail\n");
752
ap->th_opcode = ntohs((u_short)ap->th_opcode);
753
ap->th_block = ntohs((u_short)ap->th_block);
755
if (ap->th_opcode == ERROR) {
760
if (ap->th_opcode == ACK) {
761
if (ap->th_block == block) {
764
/* Re-synchronize with the other side */
765
(void) synchnet(peer);
766
if (ap->th_block == (block -1)) {
773
} while (size == SEGSIZE);
776
static void justquit(int signum)
786
static void recvtftp(struct testcase *test, struct formats *pf)
789
struct tftphdr *ap; /* ack buffer */
790
unsigned short block = 0;
793
mysignal(SIGALRM, timer);
795
ap = (struct tftphdr *)ackbuf;
798
ap->th_opcode = htons((u_short)ACK);
799
ap->th_block = htons((u_short)block);
801
(void) sigsetjmp(timeoutbuf, 1);
803
if (send(peer, ackbuf, 4, 0) != 4) {
804
logmsg("write: fail\n");
807
write_behind(test, pf->f_convert);
810
n = recv(peer, dp, PKTSIZE, 0);
812
if (n < 0) { /* really? */
813
logmsg("read: fail\n");
816
dp->th_opcode = ntohs((u_short)dp->th_opcode);
817
dp->th_block = ntohs((u_short)dp->th_block);
818
if (dp->th_opcode == ERROR)
820
if (dp->th_opcode == DATA) {
821
if (dp->th_block == block) {
824
/* Re-synchronize with the other side */
825
(void) synchnet(peer);
826
if (dp->th_block == (block-1))
827
goto send_ack; /* rexmit */
831
size = writeit(test, &dp, n - 4, pf->f_convert);
832
if (size != (n-4)) { /* ahem */
839
} while (size == SEGSIZE);
840
write_behind(test, pf->f_convert);
842
ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
843
ap->th_block = htons((u_short)(block));
844
(void) send(peer, ackbuf, 4, 0);
846
mysignal(SIGALRM, justquit); /* just quit on timeout */
848
n = recv(peer, buf, sizeof (buf), 0); /* normally times out and quits */
850
if (n >= 4 && /* if read some data */
851
dp->th_opcode == DATA && /* and got a data block */
852
block == dp->th_block) { /* then my last ack was lost */
853
(void) send(peer, ackbuf, 4, 0); /* resend final ack */
863
{ EUNDEF, "Undefined error code" },
864
{ ENOTFOUND, "File not found" },
865
{ EACCESS, "Access violation" },
866
{ ENOSPACE, "Disk full or allocation exceeded" },
867
{ EBADOP, "Illegal TFTP operation" },
868
{ EBADID, "Unknown transfer ID" },
869
{ EEXISTS, "File already exists" },
870
{ ENOUSER, "No such user" },
875
* Send a nak packet (error message). Error code passed in is one of the
876
* standard TFTP codes, or a UNIX errno offset by 100.
878
static void nak(int error)
884
tp = (struct tftphdr *)buf;
885
tp->th_opcode = htons((u_short)ERROR);
886
tp->th_code = htons((u_short)error);
887
for (pe = errmsgs; pe->e_code >= 0; pe++)
888
if (pe->e_code == error)
890
if (pe->e_code < 0) {
891
pe->e_msg = strerror(error - 100);
892
tp->th_code = EUNDEF; /* set 'undef' errorcode */
894
strcpy(tp->th_msg, pe->e_msg);
895
length = (int)strlen(pe->e_msg);
896
tp->th_msg[length] = '\0';
898
if (send(peer, buf, length, 0) != length)
899
logmsg("nak: fail\n");
added
removed
tests/server/tftpd.c
