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 <errno.h> 37 #include <netdb.h> 38 #include <stdarg.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 { EAI_NODATA, FETCH_RESOLV, "Host not found" }, 55 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, 56 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, 57 { EAI_NONAME, FETCH_RESOLV, "No address record" }, 58 { -1, FETCH_UNKNOWN, "Unknown resolver error" } 59 }; 60 61 62 /*** Error-reporting functions ***********************************************/ 63 64 /* 65 * Map error code to string 66 */ 67 static struct fetcherr * 68 _fetch_finderr(struct fetcherr *p, int e) 69 { 70 while (p->num != -1 && p->num != e) 71 p++; 72 return p; 73 } 74 75 /* 76 * Set error code 77 */ 78 void 79 _fetch_seterr(struct fetcherr *p, int e) 80 { 81 p = _fetch_finderr(p, e); 82 fetchLastErrCode = p->cat; 83 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); 84 } 85 86 /* 87 * Set error code according to errno 88 */ 89 void 90 _fetch_syserr(void) 91 { 92 int e; 93 e = errno; 94 95 switch (errno) { 96 case 0: 97 fetchLastErrCode = FETCH_OK; 98 break; 99 case EPERM: 100 case EACCES: 101 case EROFS: 102 case EAUTH: 103 case ENEEDAUTH: 104 fetchLastErrCode = FETCH_AUTH; 105 break; 106 case ENOENT: 107 case EISDIR: /* XXX */ 108 fetchLastErrCode = FETCH_UNAVAIL; 109 break; 110 case ENOMEM: 111 fetchLastErrCode = FETCH_MEMORY; 112 break; 113 case EBUSY: 114 case EAGAIN: 115 fetchLastErrCode = FETCH_TEMP; 116 break; 117 case EEXIST: 118 fetchLastErrCode = FETCH_EXISTS; 119 break; 120 case ENOSPC: 121 fetchLastErrCode = FETCH_FULL; 122 break; 123 case EADDRINUSE: 124 case EADDRNOTAVAIL: 125 case ENETDOWN: 126 case ENETUNREACH: 127 case ENETRESET: 128 case EHOSTUNREACH: 129 fetchLastErrCode = FETCH_NETWORK; 130 break; 131 case ECONNABORTED: 132 case ECONNRESET: 133 fetchLastErrCode = FETCH_ABORT; 134 break; 135 case ETIMEDOUT: 136 fetchLastErrCode = FETCH_TIMEOUT; 137 break; 138 case ECONNREFUSED: 139 case EHOSTDOWN: 140 fetchLastErrCode = FETCH_DOWN; 141 break; 142 default: 143 fetchLastErrCode = FETCH_UNKNOWN; 144 } 145 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(e)); 146 } 147 148 149 /* 150 * Emit status message 151 */ 152 void 153 _fetch_info(char *fmt, ...) 154 { 155 va_list ap; 156 157 va_start(ap, fmt); 158 vfprintf(stderr, fmt, ap); 159 va_end(ap); 160 fputc('\n', stderr); 161 } 162 163 164 /*** Network-related utility functions ***************************************/ 165 166 /* 167 * Establish a TCP connection to the specified port on the specified host. 168 */ 169 int 170 _fetch_connect(char *host, int port, int af, int verbose) 171 { 172 char pbuf[10]; 173 struct addrinfo hints, *res, *res0; 174 int sd, err; 175 176 #ifndef NDEBUG 177 fprintf(stderr, "\033[1m---> %s:%d\033[m\n", host, port); 178 #endif 179 180 if (verbose) 181 _fetch_info("looking up %s", host); 182 183 /* look up host name and set up socket address structure */ 184 snprintf(pbuf, sizeof(pbuf), "%d", port); 185 memset(&hints, 0, sizeof(hints)); 186 hints.ai_family = af; 187 hints.ai_socktype = SOCK_STREAM; 188 hints.ai_protocol = 0; 189 if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { 190 _netdb_seterr(err); 191 return -1; 192 } 193 194 if (verbose) 195 _fetch_info("connecting to %s:%d", host, port); 196 197 /* try to connect */ 198 sd = -1; 199 for (res = res0; res; res = res->ai_next) { 200 if ((sd = socket(res->ai_family, res->ai_socktype, 201 res->ai_protocol)) < 0) 202 continue; 203 if (connect(sd, res->ai_addr, res->ai_addrlen) >= 0) 204 break; 205 close(sd); 206 sd = -1; 207 } 208 if (sd < 0) { 209 _fetch_syserr(); 210 return -1; 211 } 212 213 return sd; 214 } 215 216 217 /* 218 * Read a line of text from a socket w/ timeout 219 */ 220 #define MIN_BUF_SIZE 1024 221 222 int 223 _fetch_getln(int fd, char **buf, size_t *size, size_t *len) 224 { 225 struct timeval now, timeout, wait; 226 fd_set readfds; 227 int r; 228 char c; 229 230 if (*buf == NULL) { 231 if ((*buf = malloc(MIN_BUF_SIZE)) == NULL) { 232 errno = ENOMEM; 233 return -1; 234 } 235 *size = MIN_BUF_SIZE; 236 } 237 238 **buf = '\0'; 239 *len = 0; 240 241 if (fetchTimeout) { 242 gettimeofday(&timeout, NULL); 243 timeout.tv_sec += fetchTimeout; 244 FD_ZERO(&readfds); 245 } 246 247 do { 248 if (fetchTimeout) { 249 FD_SET(fd, &readfds); 250 gettimeofday(&now, NULL); 251 wait.tv_sec = timeout.tv_sec - now.tv_sec; 252 wait.tv_usec = timeout.tv_usec - now.tv_usec; 253 if (wait.tv_usec < 0) { 254 wait.tv_usec += 1000000; 255 wait.tv_sec--; 256 } 257 if (wait.tv_sec < 0) { 258 errno = ETIMEDOUT; 259 return -1; 260 } 261 r = select(fd+1, &readfds, NULL, NULL, &wait); 262 if (r == -1) { 263 if (errno == EINTR) 264 continue; 265 /* EBADF or EINVAL: shouldn't happen */ 266 return -1; 267 } 268 if (!FD_ISSET(fd, &readfds)) 269 continue; 270 } 271 r = read(fd, &c, 1); 272 if (r == 0) 273 break; 274 if (r == -1) { 275 if (errno == EINTR) 276 continue; 277 /* any other error is bad news */ 278 return -1; 279 } 280 (*buf)[*len] = c; 281 *len += 1; 282 if (*len == *size) { 283 char *tmp; 284 285 if ((tmp = realloc(*buf, *size * 2 + 1)) == NULL) { 286 errno = ENOMEM; 287 return -1; 288 } 289 *buf = tmp; 290 *size = *size * 2 + 1; 291 } 292 } while (c != '\n'); 293 294 return 0; 295 } 296 297 298 /*** Directory-related utility functions *************************************/ 299 300 int 301 _fetch_add_entry(struct url_ent **p, int *size, int *len, 302 char *name, struct url_stat *stat) 303 { 304 struct url_ent *tmp; 305 306 if (*p == NULL) { 307 #define INITIAL_SIZE 8 308 if ((*p = malloc(INITIAL_SIZE * sizeof **p)) == NULL) { 309 errno = ENOMEM; 310 _fetch_syserr(); 311 return -1; 312 } 313 *size = INITIAL_SIZE; 314 *len = 0; 315 #undef INITIAL_SIZE 316 } 317 318 if (*len >= *size - 1) { 319 tmp = realloc(*p, *size * 2 * sizeof **p); 320 if (tmp == NULL) { 321 errno = ENOMEM; 322 _fetch_syserr(); 323 return -1; 324 } 325 *size *= 2; 326 *p = tmp; 327 } 328 329 tmp = *p + *len; 330 snprintf(tmp->name, MAXPATHLEN, "%s", name); 331 bcopy(stat, &tmp->stat, sizeof *stat); 332 333 (*len)++; 334 (++tmp)->name[0] = 0; 335 336 return 0; 337 } 338