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Makefile
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Makefile.depend
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Makefile.depend.options
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tests
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tftp-file.c
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tftp-file.h
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tftp-io.c
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tftp-io.h
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tftp-options.c
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tftp-options.h
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tftp-transfer.c
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tftp-transfer.h
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tftp-utils.c
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tftp-utils.h
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tftpd.8
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tftpd.c
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Editing: tftp-file.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (C) 2008 Edwin Groothuis. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * 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 * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/types.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <sys/stat.h> #include <netinet/in.h> #include <arpa/tftp.h> #include <assert.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <unistd.h> #include "tftp-file.h" #include "tftp-utils.h" static FILE *file; static int convert; static char convbuffer[66000]; static int gotcr = 0; static size_t convert_from_net(char *buffer, size_t count) { size_t i, n; /* * Convert all CR/LF to LF and all CR,NUL to CR */ n = 0; for (i = 0; i < count; i++) { if (gotcr == 0) { convbuffer[n++] = buffer[i]; gotcr = (buffer[i] == '\r'); continue; } /* CR, NULL -> CR */ if (buffer[i] == '\0') { gotcr = 0; continue; } /* CR, LF -> LF */ if (buffer[i] == '\n') { if (n == 0) { if (ftell(file) != 0) { int r = fseek(file, -1, SEEK_END); assert(r == 0); convbuffer[n++] = '\n'; } else { /* This shouldn't happen */ tftp_log(LOG_ERR, "Received LF as first character"); abort(); } } else convbuffer[n-1] = '\n'; gotcr = 0; continue; } /* Everything else just accept as is */ convbuffer[n++] = buffer[i]; gotcr = (buffer[i] == '\r'); continue; } return fwrite(convbuffer, 1, n, file); } static size_t convert_to_net(char *buffer, size_t count, int init) { size_t i; static size_t n = 0, in = 0; static int newline = -1; if (init) { newline = -1; n = 0; in = 0; return 0 ; } /* * Convert all LF to CR,LF and all CR to CR,NUL */ i = 0; if (newline != -1) { buffer[i++] = newline; newline = -1; } while (i < count) { if (n == in) { /* When done we're done */ if (feof(file)) break; /* Otherwise read another bunch */ in = fread(convbuffer, 1, count, file); if (in == 0) break; n = 0; } /* CR -> CR,NULL */ if (convbuffer[n] == '\r') { buffer[i++] = '\r'; buffer[i++] = '\0'; n++; continue; } /* LF -> CR,LF */ if (convbuffer[n] == '\n') { buffer[i++] = '\r'; buffer[i++] = '\n'; n++; continue; } buffer[i++] = convbuffer[n++]; } if (i > count) { /* * Whoops... that isn't allowed (but it will happen * when there is a CR or LF at the end of the buffer) */ newline = buffer[i-1]; } if (i < count) { /* We are done! */ return i; } else return count; } int write_init(int fd, FILE *f, const char *mode) { if (f == NULL) { file = fdopen(fd, "w"); if (file == NULL) { int en = errno; tftp_log(LOG_ERR, "fdopen() failed: %s", strerror(errno)); return en; } } else file = f; convert = !strcmp(mode, "netascii"); return 0; } size_t write_file(char *buffer, int count) { if (convert == 0) return fwrite(buffer, 1, count, file); return convert_from_net(buffer, count); } int write_close(void) { if (fclose(file) != 0) { tftp_log(LOG_ERR, "fclose() failed: %s", strerror(errno)); return 1; } return 0; } off_t tell_file(void) { return ftello(file); } int seek_file(off_t offset) { return fseeko(file, offset, SEEK_SET); } int read_init(int fd, FILE *f, const char *mode) { convert_to_net(NULL, 0, 1); if (f == NULL) { file = fdopen(fd, "r"); if (file == NULL) { int en = errno; tftp_log(LOG_ERR, "fdopen() failed: %s", strerror(errno)); return en; } } else file = f; convert = !strcmp(mode, "netascii"); return 0; } size_t read_file(char *buffer, int count) { if (convert == 0) return fread(buffer, 1, count, file); return convert_to_net(buffer, count, 0); } int read_close(void) { if (fclose(file) != 0) { tftp_log(LOG_ERR, "fclose() failed: %s", strerror(errno)); return 1; } return 0; } /* When an error has occurred, it is possible that the two sides * are out of synch. Ie: that what I think is the other side's * response to packet N is really their response to packet N-1. * * So, to try to prevent that, we flush all the input queued up * for us on the network connection on our host. * * We return the number of packets we flushed (mostly for reporting * when trace is active). */ int synchnet(int peer) /* socket to flush */ { int i, j = 0; char rbuf[MAXPKTSIZE]; struct sockaddr_storage from; socklen_t fromlen; while (1) { (void) ioctl(peer, FIONREAD, &i); if (i) { j++; fromlen = sizeof from; (void) recvfrom(peer, rbuf, sizeof (rbuf), 0, (struct sockaddr *)&from, &fromlen); } else { return(j); } } }
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