1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2008 Edwin Groothuis. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 34 #include <netinet/in.h> 35 #include <arpa/tftp.h> 36 37 #include <stdarg.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <syslog.h> 42 43 #include "tftp-utils.h" 44 #include "tftp-io.h" 45 46 /* 47 * Default values, can be changed later via the TFTP Options 48 */ 49 int timeoutpacket = TIMEOUT; 50 int timeoutnetwork = MAX_TIMEOUTS * TIMEOUT; 51 int maxtimeouts = MAX_TIMEOUTS; 52 uint16_t segsize = SEGSIZE; 53 uint16_t pktsize = SEGSIZE + 4; 54 uint16_t windowsize = WINDOWSIZE; 55 56 int acting_as_client; 57 58 59 /* 60 * Set timeout values for packet reception. The idea is that you 61 * get 'maxtimeouts' of 5 seconds between 'timeoutpacket' (i.e. the 62 * first timeout) to 'timeoutnetwork' (i.e. the last timeout) 63 */ 64 int 65 settimeouts(int _timeoutpacket, int _timeoutnetwork, int _maxtimeouts __unused) 66 { 67 int i; 68 69 /* We cannot do impossible things */ 70 if (_timeoutpacket >= _timeoutnetwork) 71 return (0); 72 73 maxtimeouts = 0; 74 i = _timeoutpacket; 75 while (i < _timeoutnetwork || maxtimeouts < MIN_TIMEOUTS) { 76 maxtimeouts++; 77 i += 5; 78 } 79 80 timeoutpacket = _timeoutpacket; 81 timeoutnetwork = i; 82 return (1); 83 } 84 85 /* translate IPv4 mapped IPv6 address to IPv4 address */ 86 void 87 unmappedaddr(struct sockaddr_in6 *sin6) 88 { 89 struct sockaddr_in *sin4; 90 u_int32_t addr; 91 int port; 92 93 if (sin6->sin6_family != AF_INET6 || 94 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 95 return; 96 sin4 = (struct sockaddr_in *)sin6; 97 memcpy(&addr, &sin6->sin6_addr.s6_addr[12], sizeof(addr)); 98 port = sin6->sin6_port; 99 memset(sin4, 0, sizeof(struct sockaddr_in)); 100 sin4->sin_addr.s_addr = addr; 101 sin4->sin_port = port; 102 sin4->sin_family = AF_INET; 103 sin4->sin_len = sizeof(struct sockaddr_in); 104 } 105 106 /* Get a field from a \0 separated string */ 107 ssize_t 108 get_field(int peer, char *buffer, ssize_t size) 109 { 110 char *cp = buffer; 111 112 while (cp < buffer + size) { 113 if (*cp == '\0') break; 114 cp++; 115 } 116 if (*cp != '\0') { 117 tftp_log(LOG_ERR, "Bad option - no trailing \\0 found"); 118 send_error(peer, EBADOP); 119 exit(1); 120 } 121 return (cp - buffer + 1); 122 } 123 124 /* 125 * Logging functions 126 */ 127 static int _tftp_logtostdout = 1; 128 129 void 130 tftp_openlog(const char *ident, int logopt, int facility) 131 { 132 133 _tftp_logtostdout = (ident == NULL); 134 if (_tftp_logtostdout == 0) 135 openlog(ident, logopt, facility); 136 } 137 138 void 139 tftp_closelog(void) 140 { 141 142 if (_tftp_logtostdout == 0) 143 closelog(); 144 } 145 146 void 147 tftp_log(int priority, const char *message, ...) 148 { 149 va_list ap; 150 char *s; 151 152 va_start(ap, message); 153 if (_tftp_logtostdout == 0) { 154 vasprintf(&s, message, ap); 155 syslog(priority, "%s", s); 156 } else { 157 vprintf(message, ap); 158 printf("\n"); 159 } 160 va_end(ap); 161 } 162 163 /* 164 * Packet types 165 */ 166 struct packettypes packettypes[] = { 167 { RRQ, "RRQ" }, 168 { WRQ, "WRQ" }, 169 { DATA, "DATA" }, 170 { ACK, "ACK" }, 171 { ERROR, "ERROR" }, 172 { OACK, "OACK" }, 173 { 0, NULL }, 174 }; 175 176 const char * 177 packettype(int type) 178 { 179 static char failed[100]; 180 int i = 0; 181 182 while (packettypes[i].name != NULL) { 183 if (packettypes[i].value == type) 184 break; 185 i++; 186 } 187 if (packettypes[i].name != NULL) 188 return packettypes[i].name; 189 sprintf(failed, "unknown (type: %d)", type); 190 return (failed); 191 } 192 193 /* 194 * Debugs 195 */ 196 int debug = DEBUG_NONE; 197 struct debugs debugs[] = { 198 { DEBUG_PACKETS, "packet", "Packet debugging" }, 199 { DEBUG_SIMPLE, "simple", "Simple debugging" }, 200 { DEBUG_OPTIONS, "options", "Options debugging" }, 201 { DEBUG_ACCESS, "access", "TCPd access debugging" }, 202 { DEBUG_NONE, NULL, "No debugging" }, 203 }; 204 int packetdroppercentage = 0; 205 206 int 207 debug_find(char *s) 208 { 209 int i = 0; 210 211 while (debugs[i].name != NULL) { 212 if (strcasecmp(debugs[i].name, s) == 0) 213 break; 214 i++; 215 } 216 return (debugs[i].value); 217 } 218 219 int 220 debug_finds(char *s) 221 { 222 int i = 0; 223 char *ps = s; 224 225 while (s != NULL) { 226 ps = strchr(s, ' '); 227 if (ps != NULL) 228 *ps = '\0'; 229 i += debug_find(s); 230 if (ps != NULL) 231 *ps = ' '; 232 s = ps; 233 } 234 return (i); 235 } 236 237 const char * 238 debug_show(int d) 239 { 240 static char s[100]; 241 size_t space = sizeof(s); 242 int i = 0; 243 244 s[0] = '\0'; 245 while (debugs[i].name != NULL) { 246 if (d&debugs[i].value) { 247 if (s[0] != '\0') 248 strlcat(s, " ", space); 249 strlcat(s, debugs[i].name, space); 250 } 251 i++; 252 } 253 if (s[0] != '\0') 254 return (s); 255 return ("none"); 256 } 257 258 /* 259 * RP_ 260 */ 261 struct rp_errors rp_errors[] = { 262 { RP_TIMEOUT, "Network timeout" }, 263 { RP_TOOSMALL, "Not enough data bytes" }, 264 { RP_WRONGSOURCE, "Invalid IP address of UDP port" }, 265 { RP_ERROR, "Error packet" }, 266 { RP_RECVFROM, "recvfrom() complained" }, 267 { RP_TOOBIG, "Too many data bytes" }, 268 { RP_NONE, NULL } 269 }; 270 271 char * 272 rp_strerror(int error) 273 { 274 static char s[100]; 275 size_t space = sizeof(s); 276 int i = 0; 277 278 while (rp_errors[i].desc != NULL) { 279 if (rp_errors[i].error == error) { 280 strlcpy(s, rp_errors[i].desc, space); 281 space -= strlen(rp_errors[i].desc); 282 } 283 i++; 284 } 285 if (s[0] == '\0') 286 sprintf(s, "unknown (error=%d)", error); 287 return (s); 288 } 289 290 /* 291 * Performance figures 292 */ 293 294 void 295 stats_init(struct tftp_stats *ts) 296 { 297 298 ts->amount = 0; 299 ts->rollovers = 0; 300 ts->retries = 0; 301 ts->blocks = 0; 302 ts->amount = 0; 303 gettimeofday(&(ts->tstart), NULL); 304 } 305 306 void 307 printstats(const char *direction, int verbose, struct tftp_stats *ts) 308 { 309 double delta; /* compute delta in 1/10's second units */ 310 311 delta = ((ts->tstop.tv_sec*10.)+(ts->tstop.tv_usec/100000)) - 312 ((ts->tstart.tv_sec*10.)+(ts->tstart.tv_usec/100000)); 313 delta = delta/10.; /* back to seconds */ 314 315 printf("%s %zu bytes during %.1f seconds in %u blocks", 316 direction, ts->amount, delta, ts->blocks); 317 318 if (ts->rollovers != 0) 319 printf(" with %d rollover%s", 320 ts->rollovers, ts->rollovers != 1 ? "s" : ""); 321 322 if (verbose) 323 printf(" [%.0f bits/sec]", (ts->amount*8.)/delta); 324 putchar('\n'); 325 } 326