1 files changed, 752 insertions, 0 deletions

diff --git a/lib/libfetch/common.c b/lib/libfetch/common.c
new file mode 100644
index 00000000..92bfc687
--- /dev/null
+++ b/lib/libfetch/common.c
@@ -0,0 +1,752 @@
+/*-
+* 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 <sys/cdefs.h>
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <netinet/in.h>
+
+#include <errno.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#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:
+    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;
+int err;
+
+memset(&hints, 0, sizeof(hints));
+hints.ai_family = af;
+hints.ai_socktype = SOCK_STREAM;
+hints.ai_protocol = 0;
+if ((err = 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
+(void)conn;
+(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 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);
+        }
+        */
+        wait.tv_sec = fetchTimeout / 1000;
+        wait.tv_usec = (fetchTimeout % 1000) * 1000;
+        errno = 0;
+        r = select(conn->sd + 1, &readfds, NULL, NULL, &wait);
+        if (r == -1) {
+            if (errno == EINTR && fetchRestartCalls)
+                continue;
+            _fetch_syserr();
+            return (-1);
+        } else if (r == 0) {
+            errno = ETIMEDOUT;
+            _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 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);
+			}
+            */
+            wait.tv_sec = fetchTimeout / 1000;
+            wait.tv_usec = (fetchTimeout % 1000) * 1000;
+			errno = 0;
+			r = select(conn->sd + 1, NULL, &writefds, NULL, &wait);
+			if (r == -1) {
+				if (errno == EINTR && fetchRestartCalls)
+					continue;
+				return (-1);
+			} else if (r == 0) {
+                errno = ETIMEDOUT;
+				_fetch_syserr();
+				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);
+}