summaryrefslogtreecommitdiff
path: root/libcurl/src/lib/file.c
diff options
context:
space:
mode:
Diffstat (limited to 'libcurl/src/lib/file.c')
-rw-r--r--libcurl/src/lib/file.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/libcurl/src/lib/file.c b/libcurl/src/lib/file.c
new file mode 100644
index 0000000..324d4e2
--- /dev/null
+++ b/libcurl/src/lib/file.c
@@ -0,0 +1,588 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifndef CURL_DISABLE_FILE
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include "strtoofft.h"
+#include "urldata.h"
+#include <curl/curl.h>
+#include "progress.h"
+#include "sendf.h"
+#include "escape.h"
+#include "file.h"
+#include "speedcheck.h"
+#include "getinfo.h"
+#include "transfer.h"
+#include "url.h"
+#include "parsedate.h" /* for the week day and month names */
+#include "warnless.h"
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+#if defined(WIN32) || defined(MSDOS) || defined(__EMX__) || \
+ defined(__SYMBIAN32__)
+#define DOS_FILESYSTEM 1
+#endif
+
+#ifdef OPEN_NEEDS_ARG3
+# define open_readonly(p,f) open((p),(f),(0))
+#else
+# define open_readonly(p,f) open((p),(f))
+#endif
+
+/*
+ * Forward declarations.
+ */
+
+static CURLcode file_do(struct connectdata *, bool *done);
+static CURLcode file_done(struct connectdata *conn,
+ CURLcode status, bool premature);
+static CURLcode file_connect(struct connectdata *conn, bool *done);
+static CURLcode file_disconnect(struct connectdata *conn,
+ bool dead_connection);
+static CURLcode file_setup_connection(struct connectdata *conn);
+
+/*
+ * FILE scheme handler.
+ */
+
+const struct Curl_handler Curl_handler_file = {
+ "FILE", /* scheme */
+ file_setup_connection, /* setup_connection */
+ file_do, /* do_it */
+ file_done, /* done */
+ ZERO_NULL, /* do_more */
+ file_connect, /* connect_it */
+ ZERO_NULL, /* connecting */
+ ZERO_NULL, /* doing */
+ ZERO_NULL, /* proto_getsock */
+ ZERO_NULL, /* doing_getsock */
+ ZERO_NULL, /* domore_getsock */
+ ZERO_NULL, /* perform_getsock */
+ file_disconnect, /* disconnect */
+ ZERO_NULL, /* readwrite */
+ 0, /* defport */
+ CURLPROTO_FILE, /* protocol */
+ PROTOPT_NONETWORK | PROTOPT_NOURLQUERY /* flags */
+};
+
+
+static CURLcode file_setup_connection(struct connectdata *conn)
+{
+ /* allocate the FILE specific struct */
+ conn->data->req.protop = calloc(1, sizeof(struct FILEPROTO));
+ if(!conn->data->req.protop)
+ return CURLE_OUT_OF_MEMORY;
+
+ return CURLE_OK;
+}
+
+ /*
+ Check if this is a range download, and if so, set the internal variables
+ properly. This code is copied from the FTP implementation and might as
+ well be factored out.
+ */
+static CURLcode file_range(struct connectdata *conn)
+{
+ curl_off_t from, to;
+ curl_off_t totalsize=-1;
+ char *ptr;
+ char *ptr2;
+ struct SessionHandle *data = conn->data;
+
+ if(data->state.use_range && data->state.range) {
+ from=curlx_strtoofft(data->state.range, &ptr, 0);
+ while(*ptr && (ISSPACE(*ptr) || (*ptr=='-')))
+ ptr++;
+ to=curlx_strtoofft(ptr, &ptr2, 0);
+ if(ptr == ptr2) {
+ /* we didn't get any digit */
+ to=-1;
+ }
+ if((-1 == to) && (from>=0)) {
+ /* X - */
+ data->state.resume_from = from;
+ DEBUGF(infof(data, "RANGE %" CURL_FORMAT_CURL_OFF_T " to end of file\n",
+ from));
+ }
+ else if(from < 0) {
+ /* -Y */
+ data->req.maxdownload = -from;
+ data->state.resume_from = from;
+ DEBUGF(infof(data, "RANGE the last %" CURL_FORMAT_CURL_OFF_T " bytes\n",
+ -from));
+ }
+ else {
+ /* X-Y */
+ totalsize = to-from;
+ data->req.maxdownload = totalsize+1; /* include last byte */
+ data->state.resume_from = from;
+ DEBUGF(infof(data, "RANGE from %" CURL_FORMAT_CURL_OFF_T
+ " getting %" CURL_FORMAT_CURL_OFF_T " bytes\n",
+ from, data->req.maxdownload));
+ }
+ DEBUGF(infof(data, "range-download from %" CURL_FORMAT_CURL_OFF_T
+ " to %" CURL_FORMAT_CURL_OFF_T ", totally %"
+ CURL_FORMAT_CURL_OFF_T " bytes\n",
+ from, to, data->req.maxdownload));
+ }
+ else
+ data->req.maxdownload = -1;
+ return CURLE_OK;
+}
+
+/*
+ * file_connect() gets called from Curl_protocol_connect() to allow us to
+ * do protocol-specific actions at connect-time. We emulate a
+ * connect-then-transfer protocol and "connect" to the file here
+ */
+static CURLcode file_connect(struct connectdata *conn, bool *done)
+{
+ struct SessionHandle *data = conn->data;
+ char *real_path;
+ struct FILEPROTO *file = data->req.protop;
+ int fd;
+#ifdef DOS_FILESYSTEM
+ int i;
+ char *actual_path;
+#endif
+ int real_path_len;
+
+ real_path = curl_easy_unescape(data, data->state.path, 0, &real_path_len);
+ if(!real_path)
+ return CURLE_OUT_OF_MEMORY;
+
+#ifdef DOS_FILESYSTEM
+ /* If the first character is a slash, and there's
+ something that looks like a drive at the beginning of
+ the path, skip the slash. If we remove the initial
+ slash in all cases, paths without drive letters end up
+ relative to the current directory which isn't how
+ browsers work.
+
+ Some browsers accept | instead of : as the drive letter
+ separator, so we do too.
+
+ On other platforms, we need the slash to indicate an
+ absolute pathname. On Windows, absolute paths start
+ with a drive letter.
+ */
+ actual_path = real_path;
+ if((actual_path[0] == '/') &&
+ actual_path[1] &&
+ (actual_path[2] == ':' || actual_path[2] == '|')) {
+ actual_path[2] = ':';
+ actual_path++;
+ real_path_len--;
+ }
+
+ /* change path separators from '/' to '\\' for DOS, Windows and OS/2 */
+ for(i=0; i < real_path_len; ++i)
+ if(actual_path[i] == '/')
+ actual_path[i] = '\\';
+ else if(!actual_path[i]) /* binary zero */
+ return CURLE_URL_MALFORMAT;
+
+ fd = open_readonly(actual_path, O_RDONLY|O_BINARY);
+ file->path = actual_path;
+#else
+ if(memchr(real_path, 0, real_path_len))
+ /* binary zeroes indicate foul play */
+ return CURLE_URL_MALFORMAT;
+
+ fd = open_readonly(real_path, O_RDONLY);
+ file->path = real_path;
+#endif
+ file->freepath = real_path; /* free this when done */
+
+ file->fd = fd;
+ if(!data->set.upload && (fd == -1)) {
+ failf(data, "Couldn't open file %s", data->state.path);
+ file_done(conn, CURLE_FILE_COULDNT_READ_FILE, FALSE);
+ return CURLE_FILE_COULDNT_READ_FILE;
+ }
+ *done = TRUE;
+
+ return CURLE_OK;
+}
+
+static CURLcode file_done(struct connectdata *conn,
+ CURLcode status, bool premature)
+{
+ struct FILEPROTO *file = conn->data->req.protop;
+ (void)status; /* not used */
+ (void)premature; /* not used */
+
+ if(file) {
+ Curl_safefree(file->freepath);
+ file->path = NULL;
+ if(file->fd != -1)
+ close(file->fd);
+ file->fd = -1;
+ }
+
+ return CURLE_OK;
+}
+
+static CURLcode file_disconnect(struct connectdata *conn,
+ bool dead_connection)
+{
+ struct FILEPROTO *file = conn->data->req.protop;
+ (void)dead_connection; /* not used */
+
+ if(file) {
+ Curl_safefree(file->freepath);
+ file->path = NULL;
+ if(file->fd != -1)
+ close(file->fd);
+ file->fd = -1;
+ }
+
+ return CURLE_OK;
+}
+
+#ifdef DOS_FILESYSTEM
+#define DIRSEP '\\'
+#else
+#define DIRSEP '/'
+#endif
+
+static CURLcode file_upload(struct connectdata *conn)
+{
+ struct FILEPROTO *file = conn->data->req.protop;
+ const char *dir = strchr(file->path, DIRSEP);
+ int fd;
+ int mode;
+ CURLcode result = CURLE_OK;
+ struct SessionHandle *data = conn->data;
+ char *buf = data->state.buffer;
+ size_t nread;
+ size_t nwrite;
+ curl_off_t bytecount = 0;
+ struct timeval now = Curl_tvnow();
+ struct_stat file_stat;
+ const char* buf2;
+
+ /*
+ * Since FILE: doesn't do the full init, we need to provide some extra
+ * assignments here.
+ */
+ conn->fread_func = data->set.fread_func;
+ conn->fread_in = data->set.in;
+ conn->data->req.upload_fromhere = buf;
+
+ if(!dir)
+ return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */
+
+ if(!dir[1])
+ return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */
+
+#ifdef O_BINARY
+#define MODE_DEFAULT O_WRONLY|O_CREAT|O_BINARY
+#else
+#define MODE_DEFAULT O_WRONLY|O_CREAT
+#endif
+
+ if(data->state.resume_from)
+ mode = MODE_DEFAULT|O_APPEND;
+ else
+ mode = MODE_DEFAULT|O_TRUNC;
+
+ fd = open(file->path, mode, conn->data->set.new_file_perms);
+ if(fd < 0) {
+ failf(data, "Can't open %s for writing", file->path);
+ return CURLE_WRITE_ERROR;
+ }
+
+ if(-1 != data->state.infilesize)
+ /* known size of data to "upload" */
+ Curl_pgrsSetUploadSize(data, data->state.infilesize);
+
+ /* treat the negative resume offset value as the case of "-" */
+ if(data->state.resume_from < 0) {
+ if(fstat(fd, &file_stat)) {
+ close(fd);
+ failf(data, "Can't get the size of %s", file->path);
+ return CURLE_WRITE_ERROR;
+ }
+ else
+ data->state.resume_from = (curl_off_t)file_stat.st_size;
+ }
+
+ while(!result) {
+ int readcount;
+ result = Curl_fillreadbuffer(conn, BUFSIZE, &readcount);
+ if(result)
+ break;
+
+ if(readcount <= 0) /* fix questionable compare error. curlvms */
+ break;
+
+ nread = (size_t)readcount;
+
+ /*skip bytes before resume point*/
+ if(data->state.resume_from) {
+ if((curl_off_t)nread <= data->state.resume_from ) {
+ data->state.resume_from -= nread;
+ nread = 0;
+ buf2 = buf;
+ }
+ else {
+ buf2 = buf + data->state.resume_from;
+ nread -= (size_t)data->state.resume_from;
+ data->state.resume_from = 0;
+ }
+ }
+ else
+ buf2 = buf;
+
+ /* write the data to the target */
+ nwrite = write(fd, buf2, nread);
+ if(nwrite != nread) {
+ result = CURLE_SEND_ERROR;
+ break;
+ }
+
+ bytecount += nread;
+
+ Curl_pgrsSetUploadCounter(data, bytecount);
+
+ if(Curl_pgrsUpdate(conn))
+ result = CURLE_ABORTED_BY_CALLBACK;
+ else
+ result = Curl_speedcheck(data, now);
+ }
+ if(!result && Curl_pgrsUpdate(conn))
+ result = CURLE_ABORTED_BY_CALLBACK;
+
+ close(fd);
+
+ return result;
+}
+
+/*
+ * file_do() is the protocol-specific function for the do-phase, separated
+ * from the connect-phase above. Other protocols merely setup the transfer in
+ * the do-phase, to have it done in the main transfer loop but since some
+ * platforms we support don't allow select()ing etc on file handles (as
+ * opposed to sockets) we instead perform the whole do-operation in this
+ * function.
+ */
+static CURLcode file_do(struct connectdata *conn, bool *done)
+{
+ /* This implementation ignores the host name in conformance with
+ RFC 1738. Only local files (reachable via the standard file system)
+ are supported. This means that files on remotely mounted directories
+ (via NFS, Samba, NT sharing) can be accessed through a file:// URL
+ */
+ CURLcode result = CURLE_OK;
+ struct_stat statbuf; /* struct_stat instead of struct stat just to allow the
+ Windows version to have a different struct without
+ having to redefine the simple word 'stat' */
+ curl_off_t expected_size=0;
+ bool fstated=FALSE;
+ ssize_t nread;
+ struct SessionHandle *data = conn->data;
+ char *buf = data->state.buffer;
+ curl_off_t bytecount = 0;
+ int fd;
+ struct timeval now = Curl_tvnow();
+ struct FILEPROTO *file;
+
+ *done = TRUE; /* unconditionally */
+
+ Curl_initinfo(data);
+ Curl_pgrsStartNow(data);
+
+ if(data->set.upload)
+ return file_upload(conn);
+
+ file = conn->data->req.protop;
+
+ /* get the fd from the connection phase */
+ fd = file->fd;
+
+ /* VMS: This only works reliable for STREAMLF files */
+ if(-1 != fstat(fd, &statbuf)) {
+ /* we could stat it, then read out the size */
+ expected_size = statbuf.st_size;
+ /* and store the modification time */
+ data->info.filetime = (long)statbuf.st_mtime;
+ fstated = TRUE;
+ }
+
+ if(fstated && !data->state.range && data->set.timecondition) {
+ if(!Curl_meets_timecondition(data, (time_t)data->info.filetime)) {
+ *done = TRUE;
+ return CURLE_OK;
+ }
+ }
+
+ /* If we have selected NOBODY and HEADER, it means that we only want file
+ information. Which for FILE can't be much more than the file size and
+ date. */
+ if(data->set.opt_no_body && data->set.include_header && fstated) {
+ snprintf(buf, sizeof(data->state.buffer),
+ "Content-Length: %" CURL_FORMAT_CURL_OFF_T "\r\n", expected_size);
+ result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
+ if(result)
+ return result;
+
+ result = Curl_client_write(conn, CLIENTWRITE_BOTH,
+ (char *)"Accept-ranges: bytes\r\n", 0);
+ if(result)
+ return result;
+
+ if(fstated) {
+ time_t filetime = (time_t)statbuf.st_mtime;
+ struct tm buffer;
+ const struct tm *tm = &buffer;
+ result = Curl_gmtime(filetime, &buffer);
+ if(result)
+ return result;
+
+ /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
+ snprintf(buf, BUFSIZE-1,
+ "Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n",
+ Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
+ tm->tm_mday,
+ Curl_month[tm->tm_mon],
+ tm->tm_year + 1900,
+ tm->tm_hour,
+ tm->tm_min,
+ tm->tm_sec);
+ result = Curl_client_write(conn, CLIENTWRITE_BOTH, buf, 0);
+ }
+ /* if we fstat()ed the file, set the file size to make it available post-
+ transfer */
+ if(fstated)
+ Curl_pgrsSetDownloadSize(data, expected_size);
+ return result;
+ }
+
+ /* Check whether file range has been specified */
+ file_range(conn);
+
+ /* Adjust the start offset in case we want to get the N last bytes
+ * of the stream iff the filesize could be determined */
+ if(data->state.resume_from < 0) {
+ if(!fstated) {
+ failf(data, "Can't get the size of file.");
+ return CURLE_READ_ERROR;
+ }
+ else
+ data->state.resume_from += (curl_off_t)statbuf.st_size;
+ }
+
+ if(data->state.resume_from <= expected_size)
+ expected_size -= data->state.resume_from;
+ else {
+ failf(data, "failed to resume file:// transfer");
+ return CURLE_BAD_DOWNLOAD_RESUME;
+ }
+
+ /* A high water mark has been specified so we obey... */
+ if(data->req.maxdownload > 0)
+ expected_size = data->req.maxdownload;
+
+ if(fstated && (expected_size == 0))
+ return CURLE_OK;
+
+ /* The following is a shortcut implementation of file reading
+ this is both more efficient than the former call to download() and
+ it avoids problems with select() and recv() on file descriptors
+ in Winsock */
+ if(fstated)
+ Curl_pgrsSetDownloadSize(data, expected_size);
+
+ if(data->state.resume_from) {
+ if(data->state.resume_from !=
+ lseek(fd, data->state.resume_from, SEEK_SET))
+ return CURLE_BAD_DOWNLOAD_RESUME;
+ }
+
+ Curl_pgrsTime(data, TIMER_STARTTRANSFER);
+
+ while(!result) {
+ /* Don't fill a whole buffer if we want less than all data */
+ size_t bytestoread =
+ (expected_size < CURL_OFF_T_C(BUFSIZE) - CURL_OFF_T_C(1)) ?
+ curlx_sotouz(expected_size) : BUFSIZE - 1;
+
+ nread = read(fd, buf, bytestoread);
+
+ if(nread > 0)
+ buf[nread] = 0;
+
+ if(nread <= 0 || expected_size == 0)
+ break;
+
+ bytecount += nread;
+ expected_size -= nread;
+
+ result = Curl_client_write(conn, CLIENTWRITE_BODY, buf, nread);
+ if(result)
+ return result;
+
+ Curl_pgrsSetDownloadCounter(data, bytecount);
+
+ if(Curl_pgrsUpdate(conn))
+ result = CURLE_ABORTED_BY_CALLBACK;
+ else
+ result = Curl_speedcheck(data, now);
+ }
+ if(Curl_pgrsUpdate(conn))
+ result = CURLE_ABORTED_BY_CALLBACK;
+
+ return result;
+}
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-24 05:43:03 +0000