mirror of https://github.com/BOINC/boinc.git
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
// This file is part of BOINC.
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// http://boinc.berkeley.edu
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// Copyright (C) 2008 University of California
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//
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// BOINC is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// BOINC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
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// switcher.C
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//
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// When run as
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// switcher Full-Path Executable-Name X1 ... Xn
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// runs program at Full-Path with args X1. ... Xn
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// note that the executable name nust be specified twice:
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// once as part of the Full_Path and again as just the name
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#include <unistd.h>
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#include <cstdio>
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#include <cstring>
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#include <cerrno>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h> // for MAXPATHLEN
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#endif
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#include <pwd.h> // getpwuid
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#include <grp.h>
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using std::strcpy;
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int main(int argc, char** argv) {
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passwd *pw;
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group *grp;
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char user_name[256], group_name[256];
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strcpy(user_name, "boinc_project");
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strcpy(group_name, "boinc_project");
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#if 0 // For debugging only
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char current_dir[MAXPATHLEN];
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getcwd( current_dir, sizeof(current_dir));
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fprintf(stderr, "current directory = %s\n", current_dir);
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for (int i=0; i<argc; i++) {
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fprintf(stderr, "switcher arg %d: %s\n", i, argv[i]);
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}
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fflush(stderr);
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#endif
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#if 0 // For debugging only
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// Allow debugging without running as user or group boinc_project
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pw = getpwuid(getuid());
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if (pw) strcpy(user_name, pw->pw_name);
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grp = getgrgid(getgid());
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if (grp) strcpy(group_name, grp->gr_gid);
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#endif
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// We are running setuid root, so setgid() sets real group ID,
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// effective group ID and saved set_group-ID for this process
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grp = getgrnam(group_name);
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if (grp) setgid(grp->gr_gid);
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// We are running setuid root, so setuid() sets real user ID,
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// effective user ID and saved set_user-ID for this process
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pw = getpwnam(user_name);
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if (pw) setuid(pw->pw_uid);
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execv(argv[1], argv+2);
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// If we got here execv failed
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fprintf(stderr, "Process creation (%s) failed: errno=%d\n", argv[1], errno);
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}
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