/*- * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav * 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 * in this position and unchanged. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 "free2net.h" #include __FBSDID("$FreeBSD: src/lib/libfetch/common.c,v 1.48.4.2 2006/11/11 00:16:07 des Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include "fetch.h" #include "common.h" /*** Local data **************************************************************/ /* * Error messages for resolver errors */ static struct fetcherr _netdb_errlist[] = { #ifdef EAI_NODATA { EAI_NODATA, FETCH_RESOLV, "Host not found" }, #endif { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" }, { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" }, { EAI_NONAME, FETCH_RESOLV, "No address record" }, { -1, FETCH_UNKNOWN, "Unknown resolver error" } }; /* End-of-Line */ static const char ENDL[2] = "\r\n"; /*** Error-reporting functions ***********************************************/ /* * Map error code to string */ static struct fetcherr * _fetch_finderr(struct fetcherr *p, int e) { while (p->num != -1 && p->num != e) p++; return (p); } /* * Set error code */ void _fetch_seterr(struct fetcherr *p, int e) { p = _fetch_finderr(p, e); fetchLastErrCode = p->cat; snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string); } /* * Set error code according to errno */ void _fetch_syserr(void) { switch (errno) { case 0: fetchLastErrCode = FETCH_OK; break; case EPERM: case EACCES: case EROFS: case EAUTH: case ENEEDAUTH: fetchLastErrCode = FETCH_AUTH; break; case ENOENT: case EISDIR: /* XXX */ fetchLastErrCode = FETCH_UNAVAIL; break; case ENOMEM: fetchLastErrCode = FETCH_MEMORY; break; case EBUSY: case EAGAIN: fetchLastErrCode = FETCH_TEMP; break; case EEXIST: fetchLastErrCode = FETCH_EXISTS; break; case ENOSPC: fetchLastErrCode = FETCH_FULL; break; case EADDRINUSE: case EADDRNOTAVAIL: case ENETDOWN: case ENETUNREACH: case ENETRESET: case EHOSTUNREACH: fetchLastErrCode = FETCH_NETWORK; break; case ECONNABORTED: case ECONNRESET: fetchLastErrCode = FETCH_ABORT; break; case ETIMEDOUT: fetchLastErrCode = FETCH_TIMEOUT; break; case ECONNREFUSED: case EHOSTDOWN: fetchLastErrCode = FETCH_DOWN; break; default: fetchLastErrCode = FETCH_UNKNOWN; } snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno)); } /* * Emit status message */ void _fetch_info(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fputc('\n', stderr); } /*** Network-related utility functions ***************************************/ /* * Return the default port for a scheme */ int _fetch_default_port(const char *scheme) { struct servent *se; if ((se = getservbyname(scheme, "tcp")) != NULL) return (ntohs(se->s_port)); if (strcasecmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PORT); if (strcasecmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PORT); return (0); } /* * Return the default proxy port for a scheme */ int _fetch_default_proxy_port(const char *scheme) { if (strcasecmp(scheme, SCHEME_FTP) == 0) return (FTP_DEFAULT_PROXY_PORT); if (strcasecmp(scheme, SCHEME_HTTP) == 0) return (HTTP_DEFAULT_PROXY_PORT); return (0); } /* * Create a connection for an existing descriptor. */ conn_t * _fetch_reopen(int sd) { conn_t *conn; /* allocate and fill connection structure */ if ((conn = calloc(1, sizeof(*conn))) == NULL) return (NULL); conn->sd = sd; ++conn->ref; return (conn); } /* * Bump a connection's reference count. */ conn_t * _fetch_ref(conn_t *conn) { ++conn->ref; return (conn); } /* * Bind a socket to a specific local address */ int _fetch_bind(int sd, int af, const char *addr) { struct addrinfo hints, *res, *res0; memset(&hints, 0, sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; if (getaddrinfo(addr, NULL, &hints, &res0) != 0) return (-1); for (res = res0; res; res = res->ai_next) if (bind(sd, res->ai_addr, res->ai_addrlen) == 0) return (0); return (-1); } /* * Establish a TCP connection to the specified port on the specified host. */ conn_t * _fetch_connect(const char *host, int port, int af, int verbose) { conn_t *conn; char pbuf[10]; const char *bindaddr; struct addrinfo hints, *res, *res0; int sd, err; DEBUG(fprintf(stderr, "---> %s:%d\n", host, port)); if (verbose) _fetch_info("looking up %s", host); /* look up host name and set up socket address structure */ snprintf(pbuf, sizeof(pbuf), "%d", port); memset(&hints, 0, sizeof(hints)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) { _netdb_seterr(err); return (NULL); } bindaddr = getenv("FETCH_BIND_ADDRESS"); if (verbose) _fetch_info("connecting to %s:%d", host, port); /* try to connect */ for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) { if ((sd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1) continue; if (bindaddr != NULL && *bindaddr != '\0' && _fetch_bind(sd, res->ai_family, bindaddr) != 0) { _fetch_info("failed to bind to '%s'", bindaddr); close(sd); continue; } if (connect(sd, res->ai_addr, res->ai_addrlen) == 0) break; close(sd); } freeaddrinfo(res0); if (sd == -1) { _fetch_syserr(); return (NULL); } if ((conn = _fetch_reopen(sd)) == NULL) { _fetch_syserr(); close(sd); } return (conn); } /* * Enable SSL on a connection. */ int _fetch_ssl(conn_t *conn, int verbose) { #ifdef WITH_SSL /* Init the SSL library and context */ if (!SSL_library_init()){ fprintf(stderr, "SSL library init failed\n"); return (-1); } SSL_load_error_strings(); conn->ssl_meth = SSLv23_client_method(); conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth); SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY); conn->ssl = SSL_new(conn->ssl_ctx); if (conn->ssl == NULL){ fprintf(stderr, "SSL context creation failed\n"); return (-1); } SSL_set_fd(conn->ssl, conn->sd); if (SSL_connect(conn->ssl) == -1){ ERR_print_errors_fp(stderr); return (-1); } if (verbose) { X509_NAME *name; char *str; fprintf(stderr, "SSL connection established using %s\n", SSL_get_cipher(conn->ssl)); conn->ssl_cert = SSL_get_peer_certificate(conn->ssl); name = X509_get_subject_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); printf("Certificate subject: %s\n", str); free(str); name = X509_get_issuer_name(conn->ssl_cert); str = X509_NAME_oneline(name, 0, 0); printf("Certificate issuer: %s\n", str); free(str); } return (0); #else /* LINTED */ (void)conn; /* LINTED */ (void)verbose; fprintf(stderr, "SSL support disabled\n"); return (-1); #endif } /* * Read a character from a connection w/ timeout */ ssize_t _fetch_read(conn_t *conn, char *buf, size_t len) { struct timeval now, timeout, wait; fd_set readfds; ssize_t rlen, total; int r; if (fetchTimeout) { FD_ZERO(&readfds); gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } total = 0; while (len > 0) { while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) { FD_SET(conn->sd, &readfds); gettimeofday(&now, NULL); wait.tv_sec = timeout.tv_sec - now.tv_sec; wait.tv_usec = timeout.tv_usec - now.tv_usec; if (wait.tv_usec < 0) { wait.tv_usec += 1000000; wait.tv_sec--; } if (wait.tv_sec < 0) { errno = ETIMEDOUT; _fetch_syserr(); return (-1); } errno = 0; r = select(conn->sd + 1, &readfds, NULL, NULL, &wait); if (r == -1) { if (errno == EINTR && fetchRestartCalls) continue; _fetch_syserr(); return (-1); } } #ifdef WITH_SSL if (conn->ssl != NULL) rlen = SSL_read(conn->ssl, buf, len); else #endif rlen = read(conn->sd, buf, len); if (rlen == 0) break; if (rlen < 0) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } len -= rlen; buf += rlen; total += rlen; } return (total); } /* * Read a line of text from a connection w/ timeout */ #define MIN_BUF_SIZE 1024 int _fetch_getln(conn_t *conn) { char *tmp; size_t tmpsize; ssize_t len; char c; if (conn->buf == NULL) { if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) { errno = ENOMEM; return (-1); } conn->bufsize = MIN_BUF_SIZE; } conn->buf[0] = '\0'; conn->buflen = 0; do { len = _fetch_read(conn, &c, 1); if (len == -1) return (-1); if (len == 0) break; conn->buf[conn->buflen++] = c; if (conn->buflen == conn->bufsize) { tmp = conn->buf; tmpsize = conn->bufsize * 2 + 1; if ((tmp = realloc(tmp, tmpsize)) == NULL) { errno = ENOMEM; return (-1); } conn->buf = tmp; conn->bufsize = tmpsize; } } while (c != '\n'); conn->buf[conn->buflen] = '\0'; DEBUG(fprintf(stderr, "<<< %s", conn->buf)); return (0); } /* * Write to a connection w/ timeout */ ssize_t _fetch_write(conn_t *conn, const char *buf, size_t len) { struct iovec iov; iov.iov_base = __DECONST(char *, buf); iov.iov_len = len; return _fetch_writev(conn, &iov, 1); } /* * Write a vector to a connection w/ timeout * Note: can modify the iovec. */ ssize_t _fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt) { struct timeval now, timeout, wait; fd_set writefds; ssize_t wlen, total; int r; if (fetchTimeout) { FD_ZERO(&writefds); gettimeofday(&timeout, NULL); timeout.tv_sec += fetchTimeout; } total = 0; while (iovcnt > 0) { while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) { FD_SET(conn->sd, &writefds); gettimeofday(&now, NULL); wait.tv_sec = timeout.tv_sec - now.tv_sec; wait.tv_usec = timeout.tv_usec - now.tv_usec; if (wait.tv_usec < 0) { wait.tv_usec += 1000000; wait.tv_sec--; } if (wait.tv_sec < 0) { errno = ETIMEDOUT; _fetch_syserr(); return (-1); } errno = 0; r = select(conn->sd + 1, NULL, &writefds, NULL, &wait); if (r == -1) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } } errno = 0; #ifdef WITH_SSL if (conn->ssl != NULL) wlen = SSL_write(conn->ssl, iov->iov_base, iov->iov_len); else #endif wlen = writev(conn->sd, iov, iovcnt); if (wlen == 0) { /* we consider a short write a failure */ errno = EPIPE; _fetch_syserr(); return (-1); } if (wlen < 0) { if (errno == EINTR && fetchRestartCalls) continue; return (-1); } total += wlen; while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) { wlen -= iov->iov_len; iov++; iovcnt--; } if (iovcnt > 0) { iov->iov_len -= wlen; iov->iov_base = (__DECONST(char *, iov->iov_base)) + wlen; } } return (total); } /* * Write a line of text to a connection w/ timeout */ int _fetch_putln(conn_t *conn, const char *str, size_t len) { struct iovec iov[2]; int ret; DEBUG(fprintf(stderr, ">>> %s\n", str)); iov[0].iov_base = __DECONST(char *, str); iov[0].iov_len = len; iov[1].iov_base = __DECONST(char *, ENDL); iov[1].iov_len = sizeof(ENDL); if (len == 0) ret = _fetch_writev(conn, &iov[1], 1); else ret = _fetch_writev(conn, iov, 2); if (ret == -1) return (-1); return (0); } /* * Close connection */ int _fetch_close(conn_t *conn) { int ret; if (--conn->ref > 0) return (0); ret = close(conn->sd); free(conn->buf); free(conn); return (ret); } /*** Directory-related utility functions *************************************/ int _fetch_add_entry(struct url_ent **p, int *size, int *len, const char *name, struct url_stat *us) { struct url_ent *tmp; if (*p == NULL) { *size = 0; *len = 0; } if (*len >= *size - 1) { tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p)); if (tmp == NULL) { errno = ENOMEM; _fetch_syserr(); return (-1); } *size = (*size * 2 + 1); *p = tmp; } tmp = *p + *len; snprintf(tmp->name, PATH_MAX, "%s", name); bcopy(us, &tmp->stat, sizeof(*us)); (*len)++; (++tmp)->name[0] = 0; return (0); } /*** Authentication-related utility functions ********************************/ static const char * _fetch_read_word(FILE *f) { static char word[1024]; if (fscanf(f, " %1024s ", word) != 1) return (NULL); return (word); } /* * Get authentication data for a URL from .netrc */ int _fetch_netrc_auth(struct url *url) { char fn[PATH_MAX]; const char *word; char *p; FILE *f; if ((p = getenv("NETRC")) != NULL) { if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) { _fetch_info("$NETRC specifies a file name " "longer than PATH_MAX"); return (-1); } } else { if ((p = getenv("HOME")) != NULL) { struct passwd *pwd; if ((pwd = getpwuid(getuid())) == NULL || (p = pwd->pw_dir) == NULL) return (-1); } if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn)) return (-1); } if ((f = fopen(fn, "r")) == NULL) return (-1); while ((word = _fetch_read_word(f)) != NULL) { if (strcmp(word, "default") == 0) { DEBUG(_fetch_info("Using default .netrc settings")); break; } if (strcmp(word, "machine") == 0 && (word = _fetch_read_word(f)) != NULL && strcasecmp(word, url->host) == 0) { DEBUG(_fetch_info("Using .netrc settings for %s", word)); break; } } if (word == NULL) goto ferr; while ((word = _fetch_read_word(f)) != NULL) { if (strcmp(word, "login") == 0) { if ((word = _fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->user, sizeof(url->user), "%s", word) > (int)sizeof(url->user)) { _fetch_info("login name in .netrc is too long"); url->user[0] = '\0'; } } else if (strcmp(word, "password") == 0) { if ((word = _fetch_read_word(f)) == NULL) goto ferr; if (snprintf(url->pwd, sizeof(url->pwd), "%s", word) > (int)sizeof(url->pwd)) { _fetch_info("password in .netrc is too long"); url->pwd[0] = '\0'; } } else if (strcmp(word, "account") == 0) { if ((word = _fetch_read_word(f)) == NULL) goto ferr; /* XXX not supported! */ } else { break; } } fclose(f); return (0); ferr: fclose(f); return (-1); }