summaryrefslogtreecommitdiffstats
path: root/lib/libfetch/common.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/libfetch/common.c')
-rw-r--r--lib/libfetch/common.c752
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);
+}
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-02 18:57:25 +0100