1 /*- 2 * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <sys/time.h> 34 #include <netinet/in.h> 35 36 #include <com_err.h> 37 #include <errno.h> 38 #include <netdb.h> 39 #include <stdlib.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "fetch.h" 45 #include "common.h" 46 47 48 /*** Local data **************************************************************/ 49 50 /* 51 * Error messages for resolver errors 52 */ 53 static struct fetcherr _netdb_errlist[] = { 54 { HOST_NOT_FOUND, FETCH_RESOLV, "Host not found" }, 55 { TRY_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 56 { NO_RECOVERY, FETCH_RESOLV, "Non-recoverable resolver failure" }, 57 { NO_DATA, FETCH_RESOLV, "No address record" }, 58 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 59 }; 60 61 static int com_err_initialized; 62 63 /*** Error-reporting functions ***********************************************/ 64 65 /* 66 * Initialize the common error library 67 */ 68 static void 69 _fetch_init_com_err(void) 70 { 71 initialize_ftch_error_table(); 72 com_err_initialized = 1; 73 } 74 75 /* 76 * Map error code to string 77 */ 78 static int 79 _fetch_finderr(struct fetcherr *p, int e) 80 { 81 int i; 82 for (i = 0; p[i].num != -1; i++) 83 if (p[i].num == e) 84 break; 85 return i; 86 } 87 88 /* 89 * Set error code 90 */ 91 void 92 _fetch_seterr(struct fetcherr *p, int e) 93 { 94 int n; 95 96 if (!com_err_initialized) 97 _fetch_init_com_err(); 98 99 n = _fetch_finderr(p, e); 100 fetchLastErrCode = p[n].cat; 101 com_err("libfetch", fetchLastErrCode, "(%03d %s)", e, p[n].string); 102 } 103 104 /* 105 * Set error code according to errno 106 */ 107 void 108 _fetch_syserr(void) 109 { 110 int e; 111 e = errno; 112 113 if (!com_err_initialized) 114 _fetch_init_com_err(); 115 116 switch (errno) { 117 case 0: 118 fetchLastErrCode = FETCH_OK; 119 break; 120 case EPERM: 121 case EACCES: 122 case EROFS: 123 case EAUTH: 124 case ENEEDAUTH: 125 fetchLastErrCode = FETCH_AUTH; 126 break; 127 case ENOENT: 128 case EISDIR: /* XXX */ 129 fetchLastErrCode = FETCH_UNAVAIL; 130 break; 131 case ENOMEM: 132 fetchLastErrCode = FETCH_MEMORY; 133 break; 134 case EBUSY: 135 case EAGAIN: 136 fetchLastErrCode = FETCH_TEMP; 137 break; 138 case EEXIST: 139 fetchLastErrCode = FETCH_EXISTS; 140 break; 141 case ENOSPC: 142 fetchLastErrCode = FETCH_FULL; 143 break; 144 case EADDRINUSE: 145 case EADDRNOTAVAIL: 146 case ENETDOWN: 147 case ENETUNREACH: 148 case ENETRESET: 149 case EHOSTUNREACH: 150 fetchLastErrCode = FETCH_NETWORK; 151 break; 152 case ECONNABORTED: 153 case ECONNRESET: 154 fetchLastErrCode = FETCH_ABORT; 155 break; 156 case ETIMEDOUT: 157 fetchLastErrCode = FETCH_TIMEOUT; 158 break; 159 case ECONNREFUSED: 160 case EHOSTDOWN: 161 fetchLastErrCode = FETCH_DOWN; 162 break; 163 default: 164 fetchLastErrCode = FETCH_UNKNOWN; 165 } 166 com_err("libfetch", fetchLastErrCode, "(%03d %s)", e, strerror(e)); 167 } 168 169 170 /* 171 * Emit status message 172 */ 173 int 174 _fetch_info(char *fmt, ...) 175 { 176 va_list ap; 177 char *s; 178 179 if (!com_err_initialized) 180 _fetch_init_com_err(); 181 182 va_start(ap, fmt); 183 vasprintf(&s, fmt, ap); 184 va_end(ap); 185 186 if (s == NULL) { 187 com_err("libfetch", FETCH_MEMORY, ""); 188 return -1; 189 } else { 190 com_err("libfetch", FETCH_VERBOSE, "%s", s); 191 free(s); 192 return 0; 193 } 194 } 195 196 197 /*** Network-related utility functions ***************************************/ 198 199 /* 200 * Establish a TCP connection to the specified port on the specified host. 201 */ 202 int 203 _fetch_connect(char *host, int port, int verbose) 204 { 205 struct sockaddr_in sin; 206 struct hostent *he; 207 int sd; 208 209 #ifndef NDEBUG 210 fprintf(stderr, "\033[1m---> %s:%d\033[m\n", host, port); 211 #endif 212 213 if (verbose) 214 _fetch_info("looking up %s", host); 215 216 /* look up host name */ 217 if ((he = gethostbyname(host)) == NULL) { 218 _netdb_seterr(h_errno); 219 return -1; 220 } 221 222 if (verbose) 223 _fetch_info("connecting to %s:%d", host, port); 224 225 /* set up socket address structure */ 226 bzero(&sin, sizeof(sin)); 227 bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length); 228 sin.sin_family = he->h_addrtype; 229 sin.sin_port = htons(port); 230 231 /* try to connect */ 232 if ((sd = socket(sin.sin_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { 233 _fetch_syserr(); 234 return -1; 235 } 236 if (connect(sd, (struct sockaddr *)&sin, sizeof sin) == -1) { 237 _fetch_syserr(); 238 close(sd); 239 return -1; 240 } 241 242 return sd; 243 } 244 245 246 /* 247 * Read a line of text from a socket w/ timeout 248 */ 249 #define MIN_BUF_SIZE 1024 250 251 int 252 _fetch_getln(int fd, char **buf, size_t *size, size_t *len) 253 { 254 struct timeval now, timeout, wait; 255 fd_set readfds; 256 int r; 257 char c; 258 259 if (*buf == NULL) { 260 if ((*buf = malloc(MIN_BUF_SIZE)) == NULL) { 261 errno = ENOMEM; 262 return -1; 263 } 264 *size = MIN_BUF_SIZE; 265 } 266 267 **buf = '\0'; 268 *len = 0; 269 270 if (fetchTimeout) { 271 gettimeofday(&timeout, NULL); 272 timeout.tv_sec += fetchTimeout; 273 FD_ZERO(&readfds); 274 } 275 276 do { 277 if (fetchTimeout) { 278 FD_SET(fd, &readfds); 279 gettimeofday(&now, NULL); 280 wait.tv_sec = timeout.tv_sec - now.tv_sec; 281 wait.tv_usec = timeout.tv_usec - now.tv_usec; 282 if (wait.tv_usec < 0) { 283 wait.tv_usec += 1000000; 284 wait.tv_sec--; 285 } 286 if (wait.tv_sec < 0) { 287 errno = ETIMEDOUT; 288 return -1; 289 } 290 r = select(fd+1, &readfds, NULL, NULL, &wait); 291 if (r == -1) { 292 if (errno == EINTR) 293 continue; 294 /* EBADF or EINVAL: shouldn't happen */ 295 return -1; 296 } 297 if (!FD_ISSET(fd, &readfds)) 298 continue; 299 } 300 r = read(fd, &c, 1); 301 if (r == 0) 302 break; 303 if (r == -1) { 304 if (errno == EINTR) 305 continue; 306 /* any other error is bad news */ 307 return -1; 308 } 309 (*buf)[*len] = c; 310 *len += 1; 311 if (*len == *size) { 312 char *tmp; 313 314 if ((tmp = realloc(*buf, *size * 2 + 1)) == NULL) { 315 errno = ENOMEM; 316 return -1; 317 } 318 *buf = tmp; 319 *size = *size * 2 + 1; 320 } 321 } while (c != '\n'); 322 323 return 0; 324 } 325 326 327 /*** Directory-related utility functions *************************************/ 328 329 int 330 _fetch_add_entry(struct url_ent **p, int *size, int *len, 331 char *name, struct url_stat *stat) 332 { 333 struct url_ent *tmp; 334 335 if (*p == NULL) { 336 #define INITIAL_SIZE 8 337 if ((*p = malloc(INITIAL_SIZE * sizeof **p)) == NULL) { 338 errno = ENOMEM; 339 _fetch_syserr(); 340 return -1; 341 } 342 *size = INITIAL_SIZE; 343 *len = 0; 344 #undef INITIAL_SIZE 345 } 346 347 if (*len >= *size - 1) { 348 tmp = realloc(*p, *size * 2 * sizeof **p); 349 if (tmp == NULL) { 350 errno = ENOMEM; 351 _fetch_syserr(); 352 return -1; 353 } 354 *size *= 2; 355 *p = tmp; 356 } 357 358 tmp = *p + *len; 359 snprintf(tmp->name, MAXPATHLEN, "%s", name); 360 bcopy(stat, &tmp->stat, sizeof *stat); 361 362 (*len)++; 363 (++tmp)->name[0] = 0; 364 365 return 0; 366 } 367