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-rw-r--r--sourceextraction.c716
1 files changed, 716 insertions, 0 deletions
diff --git a/sourceextraction.c b/sourceextraction.c
new file mode 100644
index 0000000..d28458a
--- /dev/null
+++ b/sourceextraction.c
@@ -0,0 +1,716 @@
+/* This file is part of "reprepro"
+ * Copyright (C) 2008 Bernhard R. Link
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301 USA
+ */
+#include <config.h>
+
+#include <errno.h>
+#include <assert.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#ifdef HAVE_LIBARCHIVE
+#include <archive.h>
+#include <archive_entry.h>
+#if ARCHIVE_VERSION_NUMBER < 3000000
+#define archive_read_free archive_read_finish
+#endif
+#endif
+
+#include "error.h"
+#include "filecntl.h"
+#include "chunks.h"
+#include "uncompression.h"
+#include "sourceextraction.h"
+
+struct sourceextraction {
+ bool failed, completed;
+ int difffile, tarfile, debiantarfile;
+ enum compression diffcompression, tarcompression, debiancompression;
+ /*@null@*/ char **section_p, **priority_p;
+};
+
+struct sourceextraction *sourceextraction_init(char **section_p, char **priority_p) {
+ struct sourceextraction *n;
+
+ n = zNEW(struct sourceextraction);
+ if (FAILEDTOALLOC(n))
+ return n;
+ n->difffile = -1;
+ n->tarfile = -1;
+ n->debiantarfile = -1;
+ n->section_p = section_p;
+ n->priority_p = priority_p;
+ return n;
+}
+
+void sourceextraction_abort(struct sourceextraction *e) {
+ free(e);
+}
+
+/* with must be a string constant, no pointer! */
+#define endswith(name, len, with) (len >= sizeof(with) && memcmp(name+(len+1-sizeof(with)), with, sizeof(with)-1) == 0)
+
+/* register a file part of this source */
+void sourceextraction_setpart(struct sourceextraction *e, int i, const char *basefilename) {
+ size_t bl = strlen(basefilename);
+ enum compression c;
+
+ if (e->failed)
+ return;
+
+ c = compression_by_suffix(basefilename, &bl);
+
+ if (endswith(basefilename, bl, ".dsc"))
+ return;
+ else if (endswith(basefilename, bl, ".asc"))
+ return;
+ else if (endswith(basefilename, bl, ".diff")) {
+ e->difffile = i;
+ e->diffcompression = c;
+ return;
+ } else if (endswith(basefilename, bl, ".debian.tar")) {
+ e->debiantarfile = i;
+ e->debiancompression = c;
+ return;
+ } else if (endswith(basefilename, bl, ".tar")) {
+ e->tarfile = i;
+ e->tarcompression = c;
+ return;
+ } else {
+ // TODO: errormessage
+ e->failed = true;
+ }
+}
+
+/* return the next needed file */
+bool sourceextraction_needs(struct sourceextraction *e, int *ofs_p) {
+ if (e->failed || e->completed)
+ return false;
+ if (e->difffile >= 0) {
+ if (!uncompression_supported(e->diffcompression))
+ // TODO: errormessage
+ return false;
+ *ofs_p = e->difffile;
+ return true;
+ } else if (e->debiantarfile >= 0) {
+#ifdef HAVE_LIBARCHIVE
+ if (!uncompression_supported(e->debiancompression))
+ return false;
+ *ofs_p = e->debiantarfile;
+ return true;
+#else
+ return false;
+#endif
+ } else if (e->tarfile >= 0) {
+#ifdef HAVE_LIBARCHIVE
+ if (!uncompression_supported(e->tarcompression))
+ return false;
+ *ofs_p = e->tarfile;
+ return true;
+#else
+ return false;
+#endif
+ } else
+ return false;
+}
+
+static retvalue parsediff(struct compressedfile *f, /*@null@*/char **section_p, /*@null@*/char **priority_p, bool *found_p) {
+ size_t destlength, lines_in, lines_out;
+ const char *p, *s; char *garbage;
+#define BUFSIZE 4096
+ char buffer[BUFSIZE];
+ int bytes_read, used = 0, filled = 0;
+
+ auto inline bool u_getline(void);
+ inline bool u_getline(void) {
+ do {
+ if (filled - used > 0) {
+ char *n;
+
+ p = buffer + used;
+ n = memchr(p, '\n', filled - used);
+ if (n != NULL) {
+ used += 1 + (n - p);
+ *n = '\0';
+ while (--n >= p && *n == '\r')
+ *n = '\0';
+ return true;
+ }
+ } else { assert (filled == used);
+ filled = 0;
+ used = 0;
+ }
+ if (filled == BUFSIZE) {
+ if (used == 0)
+ /* overlong line */
+ return false;
+ memmove(buffer, buffer + used, filled - used);
+ filled -= used;
+ used = 0;
+ }
+ bytes_read = uncompress_read(f, buffer + filled,
+ BUFSIZE - filled);
+ if (bytes_read <= 0)
+ return false;
+ filled += bytes_read;
+ } while (true);
+ }
+ auto inline char u_overlinegetchar(void);
+ inline char u_overlinegetchar(void) {
+ const char *n;
+ char ch;
+
+ if (filled - used > 0) {
+ ch = buffer[used];
+ } else { assert (filled == used);
+ used = 0;
+ bytes_read = uncompress_read(f, buffer, BUFSIZE);
+ if (bytes_read <= 0) {
+ filled = 0;
+ return '\0';
+ }
+ filled = bytes_read;
+ ch = buffer[0];
+ }
+ if (ch == '\n')
+ return '\0';
+
+ /* over rest of the line */
+ n = memchr(buffer + used, '\n', filled - used);
+ if (n != NULL) {
+ used = 1 + (n - buffer);
+ return ch;
+ }
+ used = 0;
+ filled = 0;
+ /* need to read more to get to the end of the line */
+ do { /* these lines can be long */
+ bytes_read = uncompress_read(f, buffer, BUFSIZE);
+ if (bytes_read <= 0)
+ return false;
+ n = memchr(buffer, '\n', bytes_read);
+ } while (n == NULL);
+ used = 1 + (n - buffer);
+ filled = bytes_read;
+ return ch;
+ }
+
+ /* we are assuming the exact format dpkg-source generates here... */
+
+ if (!u_getline()) {
+ /* empty or strange file */
+ *found_p = false;
+ return RET_OK;
+ }
+ if (memcmp(p, "diff ", 4) == 0) {
+ /* one exception is allowing diff lines,
+ * as diff -ru adds them ... */
+ if (!u_getline()) {
+ /* strange file */
+ *found_p = false;
+ return RET_OK;
+ }
+ }
+ if (unlikely(memcmp(p, "--- ", 4) != 0))
+ return RET_NOTHING;
+ if (!u_getline())
+ /* so short a file? */
+ return RET_NOTHING;
+ if (unlikely(memcmp(p, "+++ ", 4) != 0))
+ return RET_NOTHING;
+ p += 4;
+ s = strchr(p, '/');
+ if (unlikely(s == NULL))
+ return RET_NOTHING;
+ s++;
+ /* another exception to allow diff output directly:
+ * +++ lines might have garbage after a tab... */
+ garbage = strchr(s, '\t');
+ if (garbage != NULL)
+ *garbage = '\0';
+ destlength = s - p;
+ /* ignore all files that are not x/debian/control */
+ while (strcmp(s, "debian/control") != 0) {
+ if (unlikely(interrupted()))
+ return RET_ERROR_INTERRUPTED;
+ if (!u_getline())
+ return RET_NOTHING;
+ while (memcmp(p, "@@ -", 4) == 0) {
+ if (unlikely(interrupted()))
+ return RET_ERROR_INTERRUPTED;
+ p += 4;
+ while (*p != ',' && *p != ' ') {
+ if (unlikely(*p == '\0'))
+ return RET_NOTHING;
+ p++;
+ }
+ if (*p == ' ')
+ lines_in = 1;
+ else {
+ p++;
+ lines_in = 0;
+ while (*p >= '0' && *p <= '9') {
+ lines_in = 10*lines_in + (*p-'0');
+ p++;
+ }
+ }
+ while (*p == ' ')
+ p++;
+ if (unlikely(*(p++) != '+'))
+ return RET_NOTHING;
+ while (*p >= '0' && *p <= '9')
+ p++;
+ if (*p == ',') {
+ p++;
+ lines_out = 0;
+ while (*p >= '0' && *p <= '9') {
+ lines_out = 10*lines_out + (*p-'0');
+ p++;
+ }
+ } else if (*p == ' ')
+ lines_out = 1;
+ else
+ return RET_NOTHING;
+ while (*p == ' ')
+ p++;
+ if (unlikely(*p != '@'))
+ return RET_NOTHING;
+
+ while (lines_in > 0 || lines_out > 0) {
+ char ch;
+
+ ch = u_overlinegetchar();
+ switch (ch) {
+ case '+':
+ if (unlikely(lines_out == 0))
+ return RET_NOTHING;
+ lines_out--;
+ break;
+ case ' ':
+ if (unlikely(lines_out == 0))
+ return RET_NOTHING;
+ lines_out--;
+ /* no break */
+ __attribute__ ((fallthrough));
+ case '-':
+ if (unlikely(lines_in == 0))
+ return RET_NOTHING;
+ lines_in--;
+ break;
+ default:
+ return RET_NOTHING;
+ }
+ }
+ if (!u_getline()) {
+ *found_p = false;
+ /* nothing found successfully */
+ return RET_OK;
+ }
+ }
+ if (memcmp(p, "\\ No newline at end of file", 27) == 0) {
+ if (!u_getline()) {
+ /* nothing found successfully */
+ *found_p = false;
+ return RET_OK;
+ }
+ }
+ if (memcmp(p, "diff ", 4) == 0) {
+ if (!u_getline()) {
+ /* strange file, but nothing explicitly wrong */
+ *found_p = false;
+ return RET_OK;
+ }
+ }
+ if (unlikely(memcmp(p, "--- ", 4) != 0))
+ return RET_NOTHING;
+ if (!u_getline())
+ return RET_NOTHING;
+ if (unlikely(memcmp(p, "+++ ", 4) != 0))
+ return RET_NOTHING;
+ p += 4;
+ s = strchr(p, '/');
+ if (unlikely(s == NULL))
+ return RET_NOTHING;
+ /* another exception to allow diff output directly:
+ * +++ lines might have garbage after a tab... */
+ garbage = strchr(s, '\t');
+ if (garbage != NULL)
+ *garbage = '\0';
+ /* if it does not always have the same directory, then
+ * we cannot be sure it has no debian/control, so we
+ * have to fail... */
+ s++;
+ if (s != p + destlength)
+ return RET_NOTHING;
+ }
+ /* found debian/control */
+ if (!u_getline())
+ return RET_NOTHING;
+ if (unlikely(memcmp(p, "@@ -", 4) != 0))
+ return RET_NOTHING;
+ p += 4;
+ p++;
+ while (*p != ',' && *p != ' ') {
+ if (unlikely(*p == '\0'))
+ return RET_NOTHING;
+ p++;
+ }
+ if (*p == ',') {
+ p++;
+ while (*p >= '0' && *p <= '9')
+ p++;
+ }
+ while (*p == ' ')
+ p++;
+ if (unlikely(*(p++) != '+'))
+ return RET_NOTHING;
+ if (*(p++) != '1' || *(p++) != ',') {
+ /* a diff not starting at the first line (or not being
+ * more than one line) is not yet supported */
+ return RET_NOTHING;
+ }
+ lines_out = 0;
+ while (*p >= '0' && *p <= '9') {
+ lines_out = 10*lines_out + (*p-'0');
+ p++;
+ }
+ while (*p == ' ')
+ p++;
+ if (unlikely(*p != '@'))
+ return RET_NOTHING;
+ while (lines_out > 0) {
+ if (unlikely(interrupted()))
+ return RET_ERROR_INTERRUPTED;
+ if (!u_getline())
+ return RET_NOTHING;
+
+ switch (*(p++)) {
+ case '-':
+ break;
+ default:
+ return RET_NOTHING;
+ case ' ':
+ case '+':
+ if (unlikely(lines_out == 0))
+ return RET_NOTHING;
+ lines_out--;
+ if (section_p != NULL &&
+ strncasecmp(p, "Section:", 8) == 0) {
+ p += 8;
+ while (*p == ' ' || *p == '\t')
+ p++;
+ s = p;
+ while (*s != ' ' && *s != '\t' &&
+ *s != '\0' && *s != '\r')
+ s++;
+ if (s == p)
+ return RET_NOTHING;
+ *section_p = strndup(p, s-p);
+ if (FAILEDTOALLOC(*section_p))
+ return RET_ERROR_OOM;
+ while (*s == ' ' || *s == '\t' ||
+ *s == '\r')
+ s++;
+ if (*s != '\0')
+ return RET_NOTHING;
+ continue;
+ }
+ if (priority_p != NULL &&
+ strncasecmp(p, "Priority:", 9) == 0) {
+ p += 9;
+ while (*p == ' ' || *p == '\t')
+ p++;
+ s = p;
+ while (*s != ' ' && *s != '\t' &&
+ *s != '\0' && *s != '\r')
+ s++;
+ if (s == p)
+ return RET_NOTHING;
+ *priority_p = strndup(p, s-p);
+ if (FAILEDTOALLOC(*priority_p))
+ return RET_ERROR_OOM;
+ while (*s == ' ' || *s == '\t' ||
+ *s == '\r')
+ s++;
+ if (*s != '\0')
+ return RET_NOTHING;
+ continue;
+ }
+ if (*p == '\0') {
+ /* end of control data, we are
+ * finished */
+ *found_p = true;
+ return RET_OK;
+ }
+ break;
+ }
+ }
+ /* cannot yet handle a .diff not containing the full control */
+ return RET_NOTHING;
+}
+
+#ifdef HAVE_LIBARCHIVE
+static retvalue read_source_control_file(struct sourceextraction *e, struct archive *tar, struct archive_entry *entry) {
+ // TODO: implement...
+ size_t size, len, controllen;
+ ssize_t got;
+ char *buffer;
+ const char *aftercontrol;
+
+ size = archive_entry_size(entry);
+ if (size <= 0)
+ return RET_NOTHING;
+ if (size > 10*1024*1024)
+ return RET_NOTHING;
+ buffer = malloc(size+2);
+ if (FAILEDTOALLOC(buffer))
+ return RET_ERROR_OOM;
+ len = 0;
+ while ((got = archive_read_data(tar, buffer+len, ((size_t)size+1)-len)) > 0
+ && !interrupted()) {
+ len += got;
+ if (len > size) {
+ free(buffer);
+ return RET_NOTHING;
+ }
+ }
+ if (unlikely(interrupted())) {
+ free(buffer);
+ return RET_ERROR_INTERRUPTED;
+ }
+ if (got < 0) {
+ free(buffer);
+ return RET_NOTHING;
+ }
+ buffer[len] = '\0';
+ // TODO: allow a saved .diff for this file applied here
+
+ controllen = chunk_extract(buffer, buffer, len, true, &aftercontrol);
+ if (controllen == 0) {
+ free(buffer);
+ return RET_NOTHING;
+ }
+
+ if (e->section_p != NULL)
+ (void)chunk_getvalue(buffer, "Section", e->section_p);
+ if (e->priority_p != NULL)
+ (void)chunk_getvalue(buffer, "Priority", e->priority_p);
+ free(buffer);
+ return RET_OK;
+}
+
+static int compressedfile_open(UNUSED(struct archive *a), UNUSED(void *v)) {
+ return ARCHIVE_OK;
+}
+
+static int compressedfile_close(UNUSED(struct archive *a), UNUSED(void *v)) {
+ return ARCHIVE_OK;
+}
+
+static ssize_t compressedfile_read(UNUSED(struct archive *a), void *d, const void **buffer_p) {
+ struct compressedfile *f = d;
+ // TODO malloc buffer instead
+ static char mybuffer[4096];
+
+ *buffer_p = mybuffer;
+ return uncompress_read(f, mybuffer, 4096);
+}
+
+static retvalue parse_tarfile(struct sourceextraction *e, const char *filename, enum compression c, /*@out@*/bool *found_p) {
+ struct archive *tar;
+ struct archive_entry *entry;
+ struct compressedfile *file;
+ int a;
+ retvalue r, r2;
+
+ /* While an .tar, especially an .orig.tar can be very ugly
+ * (they should be pristine upstream tars, so dpkg-source works around
+ * a lot of ugliness),
+ * we are looking for debian/control. This is unlikely to be in an ugly
+ * upstream tar verbatimly. */
+
+ if (!isregularfile(filename))
+ return RET_NOTHING;
+
+ tar = archive_read_new();
+ if (FAILEDTOALLOC(tar))
+ return RET_ERROR_OOM;
+ archive_read_support_format_tar(tar);
+ archive_read_support_format_gnutar(tar);
+
+ r = uncompress_open(&file, filename, c);
+ if (!RET_IS_OK(r)) {
+ archive_read_free(tar);
+ return r;
+ }
+
+ a = archive_read_open(tar, file, compressedfile_open,
+ compressedfile_read, compressedfile_close);
+ if (a != ARCHIVE_OK) {
+ int err = archive_errno(tar);
+ if (err != -EINVAL && err != 0)
+ fprintf(stderr,
+"Error %d trying to extract control information from %s:\n" "%s\n",
+ err, filename, archive_error_string(tar));
+ else
+ fprintf(stderr,
+"Error trying to extract control information from %s:\n" "%s\n",
+ filename, archive_error_string(tar));
+ archive_read_free(tar);
+ uncompress_abort(file);
+ return RET_ERROR;
+ }
+ while ((a=archive_read_next_header(tar, &entry)) == ARCHIVE_OK) {
+ const char *name = archive_entry_pathname(entry);
+ const char *s;
+ bool iscontrol;
+
+ if (name[0] == '.' && name[1] == '/')
+ name += 2;
+ s = strchr(name, '/');
+ if (s == NULL)
+ // TODO: is this already enough to give up totally?
+ iscontrol = false;
+ else
+ iscontrol = strcmp(s+1, "debian/control") == 0 ||
+ strcmp(name, "debian/control") == 0;
+
+ if (iscontrol) {
+ r = read_source_control_file(e, tar, entry);
+ archive_read_free(tar);
+ r2 = uncompress_error(file);
+ RET_UPDATE(r, r2);
+ uncompress_abort(file);
+ *found_p = true;
+ return r;
+ }
+ a = archive_read_data_skip(tar);
+ if (a != ARCHIVE_OK) {
+ int err = archive_errno(tar);
+ printf("Error %d skipping %s within %s: %s\n",
+ err, name, filename,
+ archive_error_string(tar));
+ archive_read_free(tar);
+ if (err == 0 || err == -EINVAL)
+ r = RET_ERROR;
+ else
+ r = RET_ERRNO(err);
+ r2 = uncompress_error(file);
+ RET_UPDATE(r, r2);
+ uncompress_abort(file);
+ return r;
+ }
+ if (interrupted())
+ return RET_ERROR_INTERRUPTED;
+ }
+ if (a != ARCHIVE_EOF) {
+ int err = archive_errno(tar);
+ fprintf(stderr, "Error %d reading %s: %s\n",
+ err, filename, archive_error_string(tar));
+ archive_read_free(tar);
+ if (err == 0 || err == -EINVAL)
+ r = RET_ERROR;
+ else
+ r = RET_ERRNO(err);
+ r2 = uncompress_error(file);
+ RET_UPDATE(r, r2);
+ uncompress_abort(file);
+ return r;
+ }
+ archive_read_free(tar);
+ *found_p = false;
+ return uncompress_close(file);
+}
+#endif
+
+/* full file name of requested files ready to analyse */
+retvalue sourceextraction_analyse(struct sourceextraction *e, const char *fullfilename) {
+ retvalue r;
+ bool found;
+
+#ifndef HAVE_LIBARCHIVE
+ assert (e->difffile >= 0);
+#endif
+ if (e->difffile >= 0) {
+ struct compressedfile *f;
+
+ assert (uncompression_supported(e->diffcompression));
+ e->difffile = -1;
+
+ r = uncompress_open(&f, fullfilename, e->diffcompression);
+ if (!RET_IS_OK(r)) {
+ e->failed = true;
+ /* being unable to read a file is no hard error... */
+ return RET_NOTHING;
+ }
+ r = parsediff(f, e->section_p, e->priority_p, &found);
+ if (RET_IS_OK(r)) {
+ if (!found)
+ r = uncompress_close(f);
+ else {
+ r = uncompress_error(f);
+ uncompress_abort(f);
+ }
+ } else {
+ uncompress_abort(f);
+ }
+ if (!RET_IS_OK(r))
+ e->failed = true;
+ else if (found)
+ /* do not look in the tar, we found debian/control */
+ e->completed = true;
+ return r;
+ }
+
+#ifdef HAVE_LIBARCHIVE
+ if (e->debiantarfile >= 0) {
+ e->debiantarfile = -1;
+ r = parse_tarfile(e, fullfilename, e->debiancompression,
+ &found);
+ if (!RET_IS_OK(r))
+ e->failed = true;
+ else if (found)
+ /* do not look in the tar, we found debian/control */
+ e->completed = true;
+ return r;
+ }
+#endif
+
+ /* if it's not the diff nor the .debian.tar, look into the .tar file: */
+ assert (e->tarfile >= 0);
+ e->tarfile = -1;
+
+#ifdef HAVE_LIBARCHIVE
+ r = parse_tarfile(e, fullfilename, e->tarcompression, &found);
+ if (!RET_IS_OK(r))
+ e->failed = true;
+ else if (found)
+ /* do not look in the tar, we found debian/control */
+ e->completed = true;
+ return r;
+#else
+ return RET_NOTHING;
+#endif
+}
+
+retvalue sourceextraction_finish(struct sourceextraction *e) {
+ if (e->completed) {
+ free(e);
+ return RET_OK;
+ }
+ free(e);
+ return RET_NOTHING;
+}
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