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-rw-r--r--dselect/methparse.cc304
1 files changed, 304 insertions, 0 deletions
diff --git a/dselect/methparse.cc b/dselect/methparse.cc
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+++ b/dselect/methparse.cc
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+/*
+ * dselect - Debian package maintenance user interface
+ * methparse.cc - access method list parsing
+ *
+ * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright © 2008-2011, 2013-2015 Guillem Jover <guillem@debian.org>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <compat.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <dpkg/i18n.h>
+#include <dpkg/c-ctype.h>
+#include <dpkg/dpkg.h>
+#include <dpkg/dpkg-db.h>
+
+#include "dselect.h"
+#include "bindings.h"
+#include "method.h"
+
+int noptions=0;
+struct dselect_option *options = nullptr, *coption = nullptr;
+struct method *methods = nullptr;
+
+static void DPKG_ATTR_NORET
+badmethod(const char *pathname, const char *why)
+{
+ ohshit(_("syntax error in method options file '%.250s' -- %s"), pathname, why);
+}
+
+static void DPKG_ATTR_NORET
+eofmethod(const char *pathname, FILE *f, const char *why)
+{
+ if (ferror(f))
+ ohshite(_("error reading options file '%.250s'"), pathname);
+ badmethod(pathname,why);
+}
+
+void readmethods(const char *pathbase, dselect_option **optionspp, int *nread) {
+ static const char *const methodprograms[]= {
+ METHODSETUPSCRIPT,
+ METHODUPDATESCRIPT,
+ METHODINSTALLSCRIPT,
+ nullptr
+ };
+ const char *const *ccpp;
+ int methodlen, c, baselen;
+ char *pathinmeth, *pathbuf, *pathmeth;
+ DIR *dir;
+ FILE *names, *descfile;
+ struct dirent *dent;
+ struct varbuf vb;
+ method *meth;
+ dselect_option *opt;
+ struct stat stab;
+
+ baselen= strlen(pathbase);
+ pathbuf= new char[baselen+IMETHODMAXLEN+IOPTIONMAXLEN+sizeof(OPTIONSDESCPFX)+10];
+ strcpy(pathbuf,pathbase);
+ strcpy(pathbuf+baselen,"/");
+ pathmeth= pathbuf+baselen+1;
+
+ dir= opendir(pathbuf);
+ if (!dir) {
+ if (errno == ENOENT) {
+ delete[] pathbuf;
+ return;
+ }
+ ohshite(_("unable to read '%.250s' directory for reading methods"),
+ pathbuf);
+ }
+
+ debug(dbg_general, "readmethods('%s',...) directory open", pathbase);
+
+ while ((dent = readdir(dir)) != nullptr) {
+ c= dent->d_name[0];
+ debug(dbg_general, "readmethods('%s',...) considering '%s' ...",
+ pathbase, dent->d_name);
+ if (c != '_' && !c_isalpha(c))
+ continue;
+ char *p = dent->d_name + 1;
+ while ((c = *p) != 0 && c_isalnum(c) && c != '_')
+ p++;
+ if (c) continue;
+ methodlen= strlen(dent->d_name);
+ if (methodlen > IMETHODMAXLEN)
+ ohshit(_("method '%.250s' has name that is too long (%d > %d characters)"),
+ dent->d_name, methodlen, IMETHODMAXLEN);
+ /* Check if there is a localized version of this method */
+
+ strcpy(pathmeth, dent->d_name);
+ strcpy(pathmeth+methodlen, "/");
+ pathinmeth= pathmeth+methodlen+1;
+
+ for (ccpp= methodprograms; *ccpp; ccpp++) {
+ strcpy(pathinmeth,*ccpp);
+ if (access(pathbuf,R_OK|X_OK))
+ ohshite(_("unable to access method script '%.250s'"), pathbuf);
+ }
+ debug(dbg_general, " readmethods('%s',...) scripts ok", pathbase);
+
+ strcpy(pathinmeth,METHODOPTIONSFILE);
+ names= fopen(pathbuf,"r");
+ if (!names)
+ ohshite(_("unable to read method options file '%.250s'"), pathbuf);
+
+ meth= new method;
+ meth->name= new char[strlen(dent->d_name)+1];
+ strcpy(meth->name,dent->d_name);
+ meth->path= new char[baselen+1+methodlen+2+50];
+ strncpy(meth->path,pathbuf,baselen+1+methodlen);
+ strcpy(meth->path+baselen+1+methodlen,"/");
+ meth->pathinmeth= meth->path+baselen+1+methodlen+1;
+ meth->next= methods;
+ meth->prev = nullptr;
+ if (methods)
+ methods->prev = meth;
+ methods= meth;
+ debug(dbg_general, " readmethods('%s',...) new method"
+ " name='%s' path='%s' pathinmeth='%s'",
+ pathbase, meth->name, meth->path, meth->pathinmeth);
+
+ while ((c= fgetc(names)) != EOF) {
+ if (c_isspace(c))
+ continue;
+ opt= new dselect_option;
+ opt->meth= meth;
+ vb.reset();
+ do {
+ if (!c_isdigit(c))
+ badmethod(pathbuf, _("non-digit where digit wanted"));
+ vb(c);
+ c= fgetc(names);
+ if (c == EOF)
+ eofmethod(pathbuf, names, _("end of file in index string"));
+ } while (!c_isspace(c));
+ if (strlen(vb.string()) > OPTIONINDEXMAXLEN)
+ badmethod(pathbuf,_("index string too long"));
+ strcpy(opt->index,vb.string());
+ do {
+ if (c == '\n') badmethod(pathbuf,_("newline before option name start"));
+ c= fgetc(names);
+ if (c == EOF)
+ eofmethod(pathbuf, names, _("end of file before option name start"));
+ } while (c_isspace(c));
+ vb.reset();
+ if (!c_isalpha(c) && c != '_')
+ badmethod(pathbuf,_("nonalpha where option name start wanted"));
+ do {
+ if (!c_isalnum(c) && c != '_')
+ badmethod(pathbuf, _("non-alphanum in option name"));
+ vb(c);
+ c= fgetc(names);
+ if (c == EOF)
+ eofmethod(pathbuf, names, _("end of file in option name"));
+ } while (!c_isspace(c));
+ opt->name= new char[strlen(vb.string())+1];
+ strcpy(opt->name,vb.string());
+ do {
+ if (c == '\n') badmethod(pathbuf,_("newline before summary"));
+ c= fgetc(names);
+ if (c == EOF)
+ eofmethod(pathbuf, names, _("end of file before summary"));
+ } while (c_isspace(c));
+ vb.reset();
+ do {
+ vb(c);
+ c= fgetc(names);
+ if (c == EOF)
+ eofmethod(pathbuf, names, _("end of file in summary - missing newline"));
+ } while (c != '\n');
+ opt->summary= new char[strlen(vb.string())+1];
+ strcpy(opt->summary,vb.string());
+
+ strcpy(pathinmeth,OPTIONSDESCPFX);
+ strcpy(pathinmeth+sizeof(OPTIONSDESCPFX)-1,opt->name);
+ descfile= fopen(pathbuf,"r");
+ if (!descfile) {
+ if (errno != ENOENT)
+ ohshite(_("unable to open option description file '%.250s'"), pathbuf);
+ opt->description = nullptr;
+ } else { /* descfile != 0 */
+ if (fstat(fileno(descfile),&stab))
+ ohshite(_("unable to stat option description file '%.250s'"), pathbuf);
+ opt->description= new char[stab.st_size+1]; errno=0;
+ size_t filelen = stab.st_size;
+ if (fread(opt->description,1,stab.st_size+1,descfile) != filelen)
+ ohshite(_("failed to read option description file '%.250s'"), pathbuf);
+ opt->description[stab.st_size]= 0;
+ if (ferror(descfile))
+ ohshite(_("error during read of option description file '%.250s'"), pathbuf);
+ fclose(descfile);
+ }
+ strcpy(pathinmeth,METHODOPTIONSFILE);
+
+ debug(dbg_general,
+ " readmethods('%s',...) new option index='%s' name='%s'"
+ " summary='%.20s' strlen(description=%s)=%zu method name='%s'"
+ " path='%s' pathinmeth='%s'",
+ pathbase,
+ opt->index, opt->name, opt->summary,
+ opt->description ? "'...'" : "null",
+ opt->description ? strlen(opt->description) : -1,
+ opt->meth->name, opt->meth->path, opt->meth->pathinmeth);
+
+ dselect_option **optinsert = optionspp;
+ while (*optinsert && strcmp(opt->index, (*optinsert)->index) > 0)
+ optinsert = &(*optinsert)->next;
+ opt->next= *optinsert;
+ *optinsert= opt;
+ (*nread)++;
+ }
+ if (ferror(names))
+ ohshite(_("error during read of method options file '%.250s'"), pathbuf);
+ fclose(names);
+ }
+ closedir(dir);
+ debug(dbg_general, "readmethods('%s',...) done", pathbase);
+ delete[] pathbuf;
+}
+
+static char *methoptfile = nullptr;
+
+void getcurrentopt() {
+ char methoptbuf[IMETHODMAXLEN+1+IOPTIONMAXLEN+2];
+ FILE *cmo;
+ int l;
+ char *p;
+
+ if (methoptfile == nullptr)
+ methoptfile = dpkg_db_get_path(CMETHOPTFILE);
+
+ coption = nullptr;
+ cmo= fopen(methoptfile,"r");
+ if (!cmo) {
+ if (errno == ENOENT) return;
+ ohshite(_("unable to open current option file '%.250s'"), methoptfile);
+ }
+ debug(dbg_general, "getcurrentopt() cmethopt open");
+ if (!fgets(methoptbuf,sizeof(methoptbuf),cmo)) { fclose(cmo); return; }
+ if (fgetc(cmo) != EOF) { fclose(cmo); return; }
+ if (!feof(cmo)) { fclose(cmo); return; }
+ debug(dbg_general, "getcurrentopt() cmethopt eof");
+ fclose(cmo);
+ debug(dbg_general, "getcurrentopt() cmethopt read");
+ l= strlen(methoptbuf); if (!l || methoptbuf[l-1] != '\n') return;
+ methoptbuf[--l]= 0;
+ debug(dbg_general, "getcurrentopt() cmethopt len and newline");
+ p= strchr(methoptbuf,' '); if (!p) return;
+ debug(dbg_general, "getcurrentopt() cmethopt space");
+ *p++= 0;
+ debug(dbg_general, "getcurrentopt() cmethopt meth name '%s'", methoptbuf);
+ method *meth = methods;
+ while (meth && strcmp(methoptbuf, meth->name))
+ meth = meth->next;
+ if (!meth) return;
+ debug(dbg_general, "getcurrentopt() cmethopt meth found; opt '%s'", p);
+ dselect_option *opt = options;
+ while (opt && (opt->meth != meth || strcmp(p, opt->name)))
+ opt = opt->next;
+ if (!opt) return;
+ debug(dbg_general, "getcurrentopt() cmethopt opt found");
+ coption= opt;
+}
+
+void writecurrentopt() {
+ struct atomic_file *file;
+
+ if (methoptfile == nullptr)
+ internerr("method options filename is nullptr");
+
+ file = atomic_file_new(methoptfile, ATOMIC_FILE_NORMAL);
+ atomic_file_open(file);
+ if (fprintf(file->fp, "%s %s\n", coption->meth->name, coption->name) == EOF)
+ ohshite(_("unable to write new option to '%.250s'"), file->name_new);
+ atomic_file_close(file);
+ atomic_file_commit(file);
+ atomic_file_free(file);
+}