First version of the TFTP server. Basic functionality is there.
This commit is contained in:
Daniel Stenberg
Родитель
bd5afc26bd
Коммит
cd5de5c0e5
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@ -0,0 +1,865 @@
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* $Id$
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*
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* Trivial file transfer protocol server.
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*
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* This code includes many modifications by Jim Guyton <guyton@rand-unix>
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*
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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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*/
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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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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* are met:
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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.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* 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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*
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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
|
||||
* 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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||||
* SUCH DAMAGE.
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*/
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#include "setup.h" /* portability help from the lib directory */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/tftp.h>
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#include <netdb.h>
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#include <setjmp.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <grp.h>
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#include "getpart.h"
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#include "util.h"
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struct testcase {
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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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};
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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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int convert);
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static void mysignal(int, void (*func)(int));
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#define TIMEOUT 5
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#define PKTSIZE SEGSIZE+4
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struct formats;
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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 sendfile(struct testcase *test, struct formats *pf);
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static void recvfile(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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struct bf {
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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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} bfs[2];
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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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prevchar = -1;
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bfs[0].counter = BF_ALLOC; /* pass out the first buffer */
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current = 0;
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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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}
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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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*/
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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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{
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struct bf *b;
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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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return b->counter;
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}
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#define MIN(x,y) ((x)<(y)?(x):(y));
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/*
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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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*/
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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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{
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int i;
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char *p;
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int c;
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struct bf *b;
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struct tftphdr *dp;
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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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return;
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nextone = !nextone; /* "incr" next buffer ptr */
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dp = (struct tftphdr *)b->buf;
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if (convert == 0) {
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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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int 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 = copy_n;
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return;
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}
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p = dp->th_data;
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for (i = 0 ; i < SEGSIZE; i++) {
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if (newline) {
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if (prevchar == '\n')
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c = '\n'; /* lf to cr,lf */
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else
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c = '\0'; /* cr to cr,nul */
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newline = 0;
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}
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else {
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if(test->rcount) {
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c=test->rptr[0];
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test->rptr++;
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test->rcount--;
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}
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else
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break;
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if (c == '\n' || c == '\r') {
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prevchar = c;
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c = '\r';
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newline = 1;
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}
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}
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*p++ = c;
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}
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b->counter = (int)(p - dp->th_data);
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}
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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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*/
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static int writeit(struct testcase *test, struct tftphdr **dpp,
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int ct, int convert)
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{
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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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}
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/*
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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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*/
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static int write_behind(struct testcase *test, int convert)
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{
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char *buf;
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int count;
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int ct;
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char *p;
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int c; /* current character */
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struct bf *b;
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struct tftphdr *dp;
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b = &bfs[nextone];
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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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if(!test->ofile) {
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char outfile[256];
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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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}
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}
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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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buf = dp->th_data;
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if (count <= 0)
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return -1; /* nak logic? */
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if (convert == 0)
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return write(test->ofile, buf, count);
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p = buf;
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ct = 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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else
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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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}
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/* formerly
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putc(c, file); */
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write(test->ofile, &c, 1);
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skipit:
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prevchar = c;
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}
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return count;
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}
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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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*
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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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*
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* We return the number of packets we flushed (mostly for reporting when trace
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* is active).
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*/
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static int synchnet(curl_socket_t f /* socket to flush */)
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{
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int i, j = 0;
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char rbuf[PKTSIZE];
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struct sockaddr_in from;
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socklen_t fromlen;
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while (1) {
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(void) ioctl(f, FIONREAD, &i);
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if (i) {
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j++;
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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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}
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else
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return j;
|
||||
}
|
||||
}
|
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|
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/*
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* Like signal(), but with well-defined semantics.
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*/
|
||||
static void mysignal(int sig, void (*handler)(int))
|
||||
{
|
||||
struct sigaction sa;
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.sa_handler = handler;
|
||||
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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#endif
|
||||
|
||||
#define DEFAULT_PORT 8999 /* UDP */
|
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const char *serverlogfile = DEFAULT_LOGFILE;
|
||||
|
||||
#define REQUEST_DUMP "log/server.input"
|
||||
|
||||
char use_ipv6=FALSE;
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct sockaddr_in me;
|
||||
#ifdef ENABLE_IPV6
|
||||
struct sockaddr_in6 me6;
|
||||
#endif /* ENABLE_IPV6 */
|
||||
|
||||
struct tftphdr *tp;
|
||||
int n = 0;
|
||||
int arg = 1;
|
||||
FILE *pidfile;
|
||||
char *pidname= (char *)".tftpd.pid";
|
||||
unsigned short port = DEFAULT_PORT;
|
||||
curl_socket_t sock;
|
||||
int flag;
|
||||
int rc;
|
||||
struct testcase test;
|
||||
|
||||
while(argc>arg) {
|
||||
if(!strcmp("--version", argv[arg])) {
|
||||
printf("tftpd IPv4%s\n",
|
||||
#ifdef ENABLE_IPV6
|
||||
"/IPv6"
|
||||
#else
|
||||
""
|
||||
#endif
|
||||
);
|
||||
return 0;
|
||||
}
|
||||
else if(!strcmp("--pidfile", argv[arg])) {
|
||||
arg++;
|
||||
if(argc>arg)
|
||||
pidname = argv[arg++];
|
||||
}
|
||||
else if(!strcmp("--ipv6", argv[arg])) {
|
||||
#ifdef ENABLE_IPV6
|
||||
use_ipv6=TRUE;
|
||||
#endif
|
||||
arg++;
|
||||
}
|
||||
else if(argc>arg) {
|
||||
|
||||
if(atoi(argv[arg]))
|
||||
port = (unsigned short)atoi(argv[arg++]);
|
||||
|
||||
if(argc>arg)
|
||||
path = argv[arg++];
|
||||
}
|
||||
}
|
||||
|
||||
#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
|
||||
win32_init();
|
||||
atexit(win32_cleanup);
|
||||
#endif
|
||||
|
||||
#ifdef ENABLE_IPV6
|
||||
if(!use_ipv6)
|
||||
#endif
|
||||
sock = socket(AF_INET, SOCK_DGRAM, 0);
|
||||
#ifdef ENABLE_IPV6
|
||||
else
|
||||
sock = socket(AF_INET6, SOCK_DGRAM, 0);
|
||||
#endif
|
||||
|
||||
if (sock < 0) {
|
||||
perror("opening stream socket");
|
||||
logmsg("Error opening socket");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
flag = 1;
|
||||
if (setsockopt
|
||||
(sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
|
||||
sizeof(int)) < 0) {
|
||||
perror("setsockopt(SO_REUSEADDR)");
|
||||
}
|
||||
|
||||
#ifdef ENABLE_IPV6
|
||||
if(!use_ipv6) {
|
||||
#endif
|
||||
me.sin_family = AF_INET;
|
||||
me.sin_addr.s_addr = INADDR_ANY;
|
||||
me.sin_port = htons(port);
|
||||
rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
|
||||
#ifdef ENABLE_IPV6
|
||||
}
|
||||
else {
|
||||
memset(&me6, 0, sizeof(struct sockaddr_in6));
|
||||
me6.sin6_family = AF_INET6;
|
||||
me6.sin6_addr = in6addr_any;
|
||||
me6.sin6_port = htons(port);
|
||||
rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
|
||||
}
|
||||
#endif /* ENABLE_IPV6 */
|
||||
if(rc < 0) {
|
||||
perror("binding stream socket");
|
||||
logmsg("Error binding socket");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
pidfile = fopen(pidname, "w");
|
||||
if(pidfile) {
|
||||
fprintf(pidfile, "%d\n", (int)getpid());
|
||||
fclose(pidfile);
|
||||
}
|
||||
else
|
||||
fprintf(stderr, "Couldn't write pid file\n");
|
||||
|
||||
logmsg("Running IPv%d version on port UDP/%d",
|
||||
#ifdef ENABLE_IPV6
|
||||
(use_ipv6?6:4)
|
||||
#else
|
||||
4
|
||||
#endif
|
||||
, port );
|
||||
|
||||
do {
|
||||
FILE *server;
|
||||
|
||||
server = fopen(REQUEST_DUMP, "ab");
|
||||
if(!server)
|
||||
break;
|
||||
|
||||
fromlen = sizeof(from);
|
||||
n = recvfrom(sock, buf, sizeof (buf), 0,
|
||||
(struct sockaddr *)&from, &fromlen);
|
||||
if (n < 0) {
|
||||
logmsg("recvfrom:\n");
|
||||
return 3;
|
||||
}
|
||||
|
||||
from.sin_family = AF_INET;
|
||||
|
||||
peer = socket(AF_INET, SOCK_DGRAM, 0);
|
||||
if (peer < 0) {
|
||||
logmsg("socket:\n");
|
||||
return 2;
|
||||
}
|
||||
|
||||
if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
|
||||
logmsg("connect: fail\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
tp = (struct tftphdr *)buf;
|
||||
tp->th_opcode = ntohs(tp->th_opcode);
|
||||
if (tp->th_opcode == RRQ || tp->th_opcode == WRQ) {
|
||||
memset(&test, 0, sizeof(test));
|
||||
test.server = server;
|
||||
tftp(&test, tp, n);
|
||||
}
|
||||
fclose(server);
|
||||
sclose(peer);
|
||||
} while(1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct formats {
|
||||
const char *f_mode;
|
||||
int f_convert;
|
||||
} formats[] = {
|
||||
{ "netascii", 1 },
|
||||
{ "octet", 0 },
|
||||
{ NULL, 0 }
|
||||
};
|
||||
|
||||
/*
|
||||
* Handle initial connection protocol.
|
||||
*/
|
||||
static int tftp(struct testcase *test, struct tftphdr *tp, int size)
|
||||
{
|
||||
char *cp;
|
||||
int first = 1, ecode;
|
||||
struct formats *pf;
|
||||
char *filename, *mode = NULL;
|
||||
|
||||
/* store input protocol */
|
||||
fprintf(test->server, "opcode: %x\n", tp->th_opcode);
|
||||
|
||||
filename = cp = tp->th_stuff;
|
||||
again:
|
||||
while (cp < buf + size) {
|
||||
if (*cp == '\0')
|
||||
break;
|
||||
cp++;
|
||||
}
|
||||
if (*cp) {
|
||||
nak(EBADOP);
|
||||
return 3;
|
||||
}
|
||||
if (first) {
|
||||
mode = ++cp;
|
||||
first = 0;
|
||||
goto again;
|
||||
}
|
||||
/* store input protocol */
|
||||
fprintf(test->server, "filename: %s\n", filename);
|
||||
|
||||
for (cp = mode; *cp; cp++)
|
||||
if (isupper(*cp))
|
||||
*cp = tolower(*cp);
|
||||
|
||||
/* store input protocol */
|
||||
fprintf(test->server, "mode: %s\n", mode);
|
||||
|
||||
for (pf = formats; pf->f_mode; pf++)
|
||||
if (strcmp(pf->f_mode, mode) == 0)
|
||||
break;
|
||||
if (!pf->f_mode) {
|
||||
nak(EBADOP);
|
||||
return 2;
|
||||
}
|
||||
ecode = validate_access(test, filename, tp->th_opcode);
|
||||
if (ecode) {
|
||||
nak(ecode);
|
||||
return 1;
|
||||
}
|
||||
if (tp->th_opcode == WRQ)
|
||||
recvfile(test, pf);
|
||||
else
|
||||
sendfile(test, pf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Validate file access.
|
||||
*/
|
||||
static int validate_access(struct testcase *test,
|
||||
const char *filename, int mode)
|
||||
{
|
||||
char *ptr;
|
||||
long testno;
|
||||
|
||||
logmsg("trying to get file: %s mode %x", filename, mode);
|
||||
|
||||
if(!strncmp("/verifiedserver", filename, 15)) {
|
||||
char weare[128];
|
||||
size_t count = sprintf(weare, "WE ROOLZ: %d\r\n", (int)getpid());
|
||||
|
||||
logmsg("Are-we-friendly question received");
|
||||
test->buffer = strdup(weare);
|
||||
test->rptr = test->buffer; /* set read pointer */
|
||||
test->bufsize = count; /* set total count */
|
||||
test->rcount = count; /* set data left to read */
|
||||
return 0; /* fine */
|
||||
}
|
||||
|
||||
/* find the last slash */
|
||||
ptr = strrchr(filename, '/');
|
||||
|
||||
if(ptr) {
|
||||
char *file;
|
||||
|
||||
ptr++; /* skip the slash */
|
||||
|
||||
/* skip all non-numericals following the slash */
|
||||
while(*ptr && !isdigit((int)*ptr))
|
||||
ptr++;
|
||||
|
||||
/* get the number */
|
||||
testno = strtol(ptr, &ptr, 10);
|
||||
|
||||
logmsg("requested test number %d", testno);
|
||||
|
||||
test->num = testno;
|
||||
|
||||
file = test2file(testno);
|
||||
|
||||
if(file) {
|
||||
FILE *stream=fopen(file, "rb");
|
||||
if(!stream) {
|
||||
logmsg("Couldn't open test file: %s", file);
|
||||
return EACCESS;
|
||||
}
|
||||
else {
|
||||
size_t count;
|
||||
test->buffer = (char *)spitout(stream, "reply", "data", &count);
|
||||
fclose(stream);
|
||||
if(test->buffer) {
|
||||
test->rptr = test->buffer; /* set read pointer */
|
||||
test->bufsize = count; /* set total count */
|
||||
test->rcount = count; /* set data left to read */
|
||||
}
|
||||
else
|
||||
return EACCESS;
|
||||
}
|
||||
|
||||
}
|
||||
else
|
||||
return EACCESS;
|
||||
}
|
||||
else {
|
||||
logmsg("no slash found in path");
|
||||
return EACCESS; /* failure */
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int timeout;
|
||||
sigjmp_buf timeoutbuf;
|
||||
|
||||
static void timer(int signum)
|
||||
{
|
||||
(void)signum;
|
||||
|
||||
timeout += rexmtval;
|
||||
if (timeout >= maxtimeout)
|
||||
exit(1);
|
||||
siglongjmp(timeoutbuf, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Send the requested file.
|
||||
*/
|
||||
static void sendfile(struct testcase *test, struct formats *pf)
|
||||
{
|
||||
struct tftphdr *dp;
|
||||
struct tftphdr *ap; /* ack packet */
|
||||
u_int16_t block = 1;
|
||||
int size, n;
|
||||
|
||||
mysignal(SIGALRM, timer);
|
||||
dp = r_init();
|
||||
ap = (struct tftphdr *)ackbuf;
|
||||
do {
|
||||
size = readit(test, &dp, pf->f_convert);
|
||||
if (size < 0) {
|
||||
nak(errno + 100);
|
||||
goto abort;
|
||||
}
|
||||
dp->th_opcode = htons((u_short)DATA);
|
||||
dp->th_block = htons((u_short)block);
|
||||
timeout = 0;
|
||||
(void) sigsetjmp(timeoutbuf, 1);
|
||||
|
||||
send_data:
|
||||
if (send(peer, dp, size + 4, 0) != size + 4) {
|
||||
logmsg("write\n");
|
||||
goto abort;
|
||||
}
|
||||
read_ahead(test, pf->f_convert);
|
||||
for ( ; ; ) {
|
||||
alarm(rexmtval); /* read the ack */
|
||||
n = recv(peer, ackbuf, sizeof (ackbuf), 0);
|
||||
alarm(0);
|
||||
if (n < 0) {
|
||||
logmsg("read: fail\n");
|
||||
goto abort;
|
||||
}
|
||||
ap->th_opcode = ntohs((u_short)ap->th_opcode);
|
||||
ap->th_block = ntohs((u_short)ap->th_block);
|
||||
|
||||
if (ap->th_opcode == ERROR)
|
||||
goto abort;
|
||||
|
||||
if (ap->th_opcode == ACK) {
|
||||
if (ap->th_block == block) {
|
||||
break;
|
||||
}
|
||||
/* Re-synchronize with the other side */
|
||||
(void) synchnet(peer);
|
||||
if (ap->th_block == (block -1)) {
|
||||
goto send_data;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
block++;
|
||||
} while (size == SEGSIZE);
|
||||
abort:
|
||||
;
|
||||
}
|
||||
|
||||
static void justquit(int signum)
|
||||
{
|
||||
(void)signum;
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Receive a file.
|
||||
*/
|
||||
static void recvfile(struct testcase *test, struct formats *pf)
|
||||
{
|
||||
struct tftphdr *dp;
|
||||
struct tftphdr *ap; /* ack buffer */
|
||||
u_int16_t block = 0;
|
||||
int n, size;
|
||||
|
||||
mysignal(SIGALRM, timer);
|
||||
dp = w_init();
|
||||
ap = (struct tftphdr *)ackbuf;
|
||||
do {
|
||||
timeout = 0;
|
||||
ap->th_opcode = htons((u_short)ACK);
|
||||
ap->th_block = htons((u_short)block);
|
||||
block++;
|
||||
(void) sigsetjmp(timeoutbuf, 1);
|
||||
send_ack:
|
||||
if (send(peer, ackbuf, 4, 0) != 4) {
|
||||
logmsg("write: fail\n");
|
||||
goto abort;
|
||||
}
|
||||
write_behind(test, pf->f_convert);
|
||||
for ( ; ; ) {
|
||||
alarm(rexmtval);
|
||||
n = recv(peer, dp, PKTSIZE, 0);
|
||||
alarm(0);
|
||||
if (n < 0) { /* really? */
|
||||
logmsg("read: fail\n");
|
||||
goto abort;
|
||||
}
|
||||
dp->th_opcode = ntohs((u_short)dp->th_opcode);
|
||||
dp->th_block = ntohs((u_short)dp->th_block);
|
||||
if (dp->th_opcode == ERROR)
|
||||
goto abort;
|
||||
if (dp->th_opcode == DATA) {
|
||||
if (dp->th_block == block) {
|
||||
break; /* normal */
|
||||
}
|
||||
/* Re-synchronize with the other side */
|
||||
(void) synchnet(peer);
|
||||
if (dp->th_block == (block-1))
|
||||
goto send_ack; /* rexmit */
|
||||
}
|
||||
}
|
||||
|
||||
size = writeit(test, &dp, n - 4, pf->f_convert);
|
||||
if (size != (n-4)) { /* ahem */
|
||||
if (size < 0)
|
||||
nak(errno + 100);
|
||||
else
|
||||
nak(ENOSPACE);
|
||||
goto abort;
|
||||
}
|
||||
} while (size == SEGSIZE);
|
||||
write_behind(test, pf->f_convert);
|
||||
|
||||
ap->th_opcode = htons((u_short)ACK); /* send the "final" ack */
|
||||
ap->th_block = htons((u_short)(block));
|
||||
(void) send(peer, ackbuf, 4, 0);
|
||||
|
||||
mysignal(SIGALRM, justquit); /* just quit on timeout */
|
||||
alarm(rexmtval);
|
||||
n = recv(peer, buf, sizeof (buf), 0); /* normally times out and quits */
|
||||
alarm(0);
|
||||
if (n >= 4 && /* if read some data */
|
||||
dp->th_opcode == DATA && /* and got a data block */
|
||||
block == dp->th_block) { /* then my last ack was lost */
|
||||
(void) send(peer, ackbuf, 4, 0); /* resend final ack */
|
||||
}
|
||||
abort:
|
||||
return;
|
||||
}
|
||||
|
||||
struct errmsg {
|
||||
int e_code;
|
||||
const char *e_msg;
|
||||
} errmsgs[] = {
|
||||
{ EUNDEF, "Undefined error code" },
|
||||
{ ENOTFOUND, "File not found" },
|
||||
{ EACCESS, "Access violation" },
|
||||
{ ENOSPACE, "Disk full or allocation exceeded" },
|
||||
{ EBADOP, "Illegal TFTP operation" },
|
||||
{ EBADID, "Unknown transfer ID" },
|
||||
{ EEXISTS, "File already exists" },
|
||||
{ ENOUSER, "No such user" },
|
||||
{ -1, 0 }
|
||||
};
|
||||
|
||||
/*
|
||||
* Send a nak packet (error message). Error code passed in is one of the
|
||||
* standard TFTP codes, or a UNIX errno offset by 100.
|
||||
*/
|
||||
static void nak(int error)
|
||||
{
|
||||
struct tftphdr *tp;
|
||||
int length;
|
||||
struct errmsg *pe;
|
||||
|
||||
tp = (struct tftphdr *)buf;
|
||||
tp->th_opcode = htons((u_short)ERROR);
|
||||
tp->th_code = htons((u_short)error);
|
||||
for (pe = errmsgs; pe->e_code >= 0; pe++)
|
||||
if (pe->e_code == error)
|
||||
break;
|
||||
if (pe->e_code < 0) {
|
||||
pe->e_msg = strerror(error - 100);
|
||||
tp->th_code = EUNDEF; /* set 'undef' errorcode */
|
||||
}
|
||||
strcpy(tp->th_msg, pe->e_msg);
|
||||
length = strlen(pe->e_msg);
|
||||
tp->th_msg[length] = '\0';
|
||||
length += 5;
|
||||
if (send(peer, buf, length, 0) != length)
|
||||
logmsg("nak: fail\n");
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче