diff options
Diffstat (limited to 'chmod_chown_chgrp.c')
| -rw-r--r-- | chmod_chown_chgrp.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/chmod_chown_chgrp.c b/chmod_chown_chgrp.c new file mode 100644 index 000000000..37a52281c --- /dev/null +++ b/chmod_chown_chgrp.c @@ -0,0 +1,253 @@ +/* + * Mini chown/chmod/chgrp implementation for busybox + * + * Copyright (C) 1998 by Erik Andersen <andersee@debian.org> + * + * This program 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <grp.h> +#include <pwd.h> +#include "internal.h" + + +static int uid=-1; +static int gid=0; +static int whichApp; +static char* invocationName=NULL; +static mode_t mode=7777; + + +#define CHGRP_APP 1 +#define CHOWN_APP 2 +#define CHMOD_APP 3 + +static const char chgrp_usage[] = "[OPTION]... GROUP FILE...\n" + "Change the group membership of each FILE to GROUP.\n" + "\n\tOptions:\n" "\t-R\tchange files and directories recursively\n"; +static const char chown_usage[] = "[OPTION]... OWNER[.[GROUP] FILE...\n" + "Change the owner and/or group of each FILE to OWNER and/or GROUP.\n" + "\n\tOptions:\n" "\t-R\tchange files and directories recursively\n"; +static const char chmod_usage[] = "[-R] MODE[,MODE]... FILE...\n" +"Each MODE is one or more of the letters ugoa, one of the symbols +-= and\n" +"one or more of the letters rwxst.\n\n" + "\t-R\tchange files and directories recursively.\n"; + + + +static int fileAction(const char *fileName) +{ + struct stat statBuf; + if (stat(fileName, &statBuf) < 0) { + switch (whichApp) { + case CHGRP_APP: + case CHOWN_APP: + if (chown(fileName, ((whichApp==CHOWN_APP)? uid: statBuf.st_uid), gid) < 0) + return( TRUE); + case CHMOD_APP: + if (chmod(fileName, mode)) + return( TRUE); + } + } + perror(fileName); + return( FALSE); +} + +/* [ugoa]{+|-|=}[rwxstl] */ +int parse_mode( const char* s, mode_t* or, mode_t* and, int* group_execute) +{ + mode_t mode = 0; + mode_t groups = S_ISVTX; + char type; + char c; + + do { + for ( ; ; ) { + switch ( c = *s++ ) { + case '\0': + return (FALSE); + case 'u': + groups |= S_ISUID|S_IRWXU; + continue; + case 'g': + groups |= S_ISGID|S_IRWXG; + continue; + case 'o': + groups |= S_IRWXO; + continue; + case 'a': + groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + continue; + case '+': + case '=': + case '-': + type = c; + if ( groups == S_ISVTX ) /* The default is "all" */ + groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + break; + default: + if ( c >= '0' && c <= '7' && mode == 0 && groups == S_ISVTX ) { + *and = 0; + *or = strtol(--s, 0, 010); + return (TRUE); + } + else + return (FALSE); + } + break; + } + + while ( (c = *s++) != '\0' ) { + switch ( c ) { + case ',': + break; + case 'r': + mode |= S_IRUSR|S_IRGRP|S_IROTH; + continue; + case 'w': + mode |= S_IWUSR|S_IWGRP|S_IWOTH; + continue; + case 'x': + mode |= S_IXUSR|S_IXGRP|S_IXOTH; + continue; + case 's': + if ( group_execute != 0 && (groups & S_IRWXG) ) { + if ( *group_execute < 0 ) + return (FALSE); + if ( type != '-' ) { + mode |= S_IXGRP; + *group_execute = 1; + } + } + mode |= S_ISUID|S_ISGID; + continue; + case 'l': + if ( *group_execute > 0 ) + return (FALSE); + if ( type != '-' ) { + *and &= ~S_IXGRP; + *group_execute = -1; + } + mode |= S_ISGID; + groups |= S_ISGID; + continue; + case 't': + mode |= S_ISVTX; + continue; + default: + return (FALSE); + } + break; + } + switch ( type ) { + case '=': + *and &= ~(groups); + /* fall through */ + case '+': + *or |= mode & groups; + break; + case '-': + *and &= ~(mode & groups); + *or &= *and; + break; + } + } while ( c == ',' ); + return (TRUE); +} + + +int chmod_chown_chgrp_main(int argc, char **argv) +{ + struct group *grp; + struct passwd *pwd; + int recursiveFlag=FALSE; + char *groupName; + mode_t andWithMode = S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + mode_t orWithMode = 0; + + + whichApp = (strcmp(*argv, "chown")==0)? CHOWN_APP : (strcmp(*argv, "chmod")==0)? CHMOD_APP : CHGRP_APP; + + if (argc < 2) { + fprintf(stderr, "Usage: %s %s", *argv, + (whichApp==TRUE)? chown_usage : chgrp_usage); + exit( FALSE); + } + invocationName=*argv; + argc--; + argv++; + + /* Parse options */ + while (**argv == '-') { + while (*++(*argv)) switch (**argv) { + case 'R': + recursiveFlag = TRUE; + break; + default: + fprintf(stderr, "Unknown option: %c\n", **argv); + exit( FALSE); + } + argc--; + argv++; + } + + if ( whichApp == CHMOD_APP ) { + /* Find the specified modes */ + if ( parse_mode(*argv, &orWithMode, &andWithMode, 0) == FALSE ) { + fprintf(stderr, "%s: Unknown mode: %s\n", invocationName, *argv); + exit( FALSE); + } + mode &= andWithMode; + mode |= orWithMode; + } else { + + /* Find the selected group */ + groupName = strchr(*argv, '.'); + if ( whichApp==TRUE && groupName ) + *groupName++ = '\0'; + else + groupName = *argv; + grp = getgrnam(groupName); + if (grp == NULL) { + fprintf(stderr, "%s: Unknown group name: %s\n", invocationName, groupName); + exit( FALSE); + } + gid = grp->gr_gid; + + /* Find the selected user (if appropriate) */ + if (whichApp==TRUE) { + pwd = getpwnam(*argv); + if (pwd == NULL) { + fprintf(stderr, "%s: Unknown user name: %s\n", invocationName, *argv); + exit( FALSE); + } + uid = pwd->pw_uid; + } + } + + /* Ok, ready to do the deed now */ + if (argc <= 1) { + fprintf(stderr, "%s: too few arguments", invocationName); + exit( FALSE); + } + while (argc-- > 1) { + argv++; + recursiveAction( *argv, recursiveFlag, TRUE, fileAction, fileAction); + } + exit(TRUE); +} + |