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newlib/winsup/utils/setfacl.c
Corinna Vinschen 56c29a3c87 * getfacl.c (username): New function. 
(groupname): Ditto.
	(usage): Ditto.  Add more user friendly help text.
	(main): Add -n and --help option.  Print names instead of IDs
	unless -n option is given.
	* setfacl.c (getperm): Tolerate whitespace and comment chars in input.
	(getaclentry): Fix several input string misdetections.
	(getaclentries): Allow - as input file name to read from stdin.
	Tolerate whitespace and comment chars in input.
	(usage): Add more user friendly help text.
	(main): Add --help option.
2001-11-04 17:24:24 +00:00

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/* setfacl.c
Copyright 2000, 2001 Red Hat Inc.
Written by Corinna Vinschen <vinschen@redhat.com>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/acl.h>
#ifndef BOOL
#define BOOL int
#endif
#ifndef TRUE
#define TRUE (1)
#endif
#ifndef FALSE
#define FALSE (0)
#endif
#ifndef ILLEGAL_MODE
#define ILLEGAL_MODE ((mode_t)0xffffffff)
#endif
typedef enum {
NoAction,
Set,
Modify,
Delete,
ModNDel,
SetFromFile
} action_t;
char *myname;
mode_t getperm (char *in)
{
if (isdigit (*in) && !in[1])
{
int i = atoi (in);
if (i < 0 || i > 7)
return ILLEGAL_MODE;
return i << 6 | i << 3 | i;
}
if (strlen (in) > 3 && strchr (" \t\n\r#", in[3]))
in[3] = '\0';
if (strlen (in) != 3)
return ILLEGAL_MODE;
if (!strchr ("r-", in[0])
|| !strchr ("w-", in[1])
|| !strchr ("x-", in[2]))
return ILLEGAL_MODE;
return (in[0] == 'r' ? S_IRUSR | S_IRGRP | S_IROTH : 0)
| (in[1] == 'w' ? S_IWUSR | S_IWGRP | S_IWOTH : 0)
| (in[2] == 'x' ? S_IXUSR | S_IXGRP | S_IXOTH : 0);
}
BOOL
getaclentry (action_t action, char *c, aclent_t *ace)
{
char *c2;
ace->a_type = 0;
ace->a_id = 0;
ace->a_perm = 0;
if (!strncmp (c, "default:", 8)
|| !strncmp (c, "d:", 2))
{
ace->a_type = ACL_DEFAULT;
c = strchr (c, ':') + 1;
}
if (!strncmp (c, "user:", 5)
|| !strncmp (c, "u:", 2))
{
ace->a_type |= USER_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "group:", 6)
|| !strncmp (c, "g:", 2))
{
ace->a_type |= GROUP_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "mask:", 5)
|| !strncmp (c, "m:", 2))
{
ace->a_type |= CLASS_OBJ;
c = strchr (c, ':') + 1;
}
else if (!strncmp (c, "other:", 6)
|| !strncmp (c, "o:", 2))
{
ace->a_type |= OTHER_OBJ;
c = strchr (c, ':') + 1;
}
else
return FALSE;
if (ace->a_type & (USER_OBJ | GROUP_OBJ))
{
if ((c2 = strchr (c, ':')))
{
if (action == Delete)
return FALSE;
*c2 = '\0';
}
else if (action != Delete)
return FALSE;
if (c2 == c)
{
if (action == Delete)
return FALSE;
}
else if (isdigit (*c))
{
char *c3;
ace->a_id = strtol (c, &c3, 10);
if (*c3)
return FALSE;
}
else if (ace->a_type & USER_OBJ)
{
struct passwd *pw = getpwnam (c);
if (!pw)
return FALSE;
ace->a_id = pw->pw_uid;
}
else
{
struct group *gr = getgrnam (c);
if (!gr)
return FALSE;
ace->a_id = gr->gr_gid;
}
if (c2 != c)
{
if (ace->a_type & USER_OBJ)
{
ace->a_type &= ~USER_OBJ;
ace->a_type |= USER;
}
else
{
ace->a_type &= ~GROUP_OBJ;
ace->a_type |= GROUP;
}
}
if (c2)
c = c2 + 1;
}
else if (*c++ != ':')
return FALSE;
if (action == Delete)
{
if ((ace->a_type & (CLASS_OBJ | OTHER_OBJ))
&& *c)
return FALSE;
ace->a_perm = ILLEGAL_MODE;
return TRUE;
}
if ((ace->a_perm = getperm (c)) == ILLEGAL_MODE)
return FALSE;
return TRUE;
}
BOOL
getaclentries (action_t action, char *buf, aclent_t *acls, int *idx)
{
char *c;
if (action == SetFromFile)
{
FILE *fp;
char fbuf[256], *fb;
if (!strcmp (buf, "-"))
fp = stdin;
else if (! (fp = fopen (buf, "r")))
return FALSE;
while ((fb = fgets (fbuf, 256, fp)))
{
while (strchr (" \t", *fb))
++fb;
if (strchr ("\n\r#", *fb))
continue;
if (!getaclentry (action, fb, acls + (*idx)++))
{
fclose (fp);
return FALSE;
}
}
if (fp != stdin)
fclose (fp);
}
else
for (c = strtok (buf, ","); c; c = strtok (NULL, ","))
if (!getaclentry (action, c, acls + (*idx)++))
return FALSE;
return TRUE;
}
int
searchace (aclent_t *aclp, int nentries, int type, int id)
{
int i;
for (i = 0; i < nentries; ++i)
if ((aclp[i].a_type == type && (id < 0 || aclp[i].a_id == id))
|| !aclp[i].a_type)
return i;
return -1;
}
int
modacl (aclent_t *tgt, int tcnt, aclent_t *src, int scnt)
{
int t, s, i;
for (s = 0; s < scnt; ++s)
{
t = searchace (tgt, MAX_ACL_ENTRIES, src[s].a_type,
(src[s].a_type & (USER | GROUP)) ? src[s].a_id : -1);
if (t < 0)
return -1;
if (src[s].a_perm == ILLEGAL_MODE)
{
if (t < tcnt)
{
for (i = t + 1; i < tcnt; ++i)
tgt[i - 1] = tgt[i];
--tcnt;
}
}
else
{
tgt[t] = src[s];
if (t >= tcnt)
++tcnt;
}
}
return tcnt;
}
void
setfacl (action_t action, char *path, aclent_t *acls, int cnt)
{
aclent_t lacl[MAX_ACL_ENTRIES];
int lcnt;
memset (lacl, 0, sizeof lacl);
if (action == Set)
{
if (acl (path, SETACL, cnt, acls))
perror (myname);
return;
}
if ((lcnt = acl (path, GETACL, MAX_ACL_ENTRIES, lacl)) < 0
|| (lcnt = modacl (lacl, lcnt, acls, cnt)) < 0
|| (lcnt = acl (path, SETACL, lcnt, lacl)) < 0)
perror (myname);
}
#define pn(txt) fprintf (fp, txt "\n", myname)
#define p(txt) fprintf (fp, txt "\n")
int
usage (int help)
{
FILE *fp = help ? stdout : stderr;
pn ("usage: %s [-r] -s acl_entries file...");
pn (" %s [-r] -md acl_entries file...");
pn (" %s [-r] -f acl_file file...");
if (!help)
pn ("Try `%s --help' for more information.");
else
{
p ("");
p ("Modify file and directory access control lists (ACLs)");
p ("");
pn ("For each file given as parameter, %s will either replace its");
p ("complete ACL (-s, -f)), or it will add, modify, or delete ACL");
p ("entries.");
p ("");
p ("The following options are supported:");
p ("");
p ("-s Substitute the ACL of the file by the entries specified on");
p (" the command line. Required entries are");
p (" - One user entry for the owner of the file.");
p (" - One group entry for the group of the file.");
p (" - One other entry.");
p (" If additional user and group entries are given:");
p (" - A mask entry for the file group class of the file.");
p (" - No duplicate user or group entries with the same uid/gid.");
p (" If it is a directory:");
p (" - One default user entry for the owner of the file.");
p (" - One default group entry for the group of the file.");
p (" - One default mask entry for the file group class of the file.");
p (" - One default other entry.");
p ("");
p (" Acl_entries are one or more comma-separated ACL entries from");
p (" the following list:");
p ("");
p (" u[ser]::perm");
p (" u[ser]:uid:perm");
p (" g[roup]::perm");
p (" g[roup]:gid:perm");
p (" m[ask]::perm");
p (" o[ther]::perm");
p ("");
p (" Default entries are like the above with the trailing default");
p (" identifier. E.g.");
p ("");
p (" d[efault]:u[ser]:uid:perm");
p ("");
p (" `perm' is either a 3-char permissions string in the form");
p (" \"rwx\" with the character - for not setting a permission");
p (" or it is the octal representation of the permissions, a");
p (" value from 0 (equivalent to \"---\") to 7 (\"rwx\").");
p (" `uid' is a user name or a numerical uid.");
p (" `gid' is a group name or a numerical gid.");
p ("");
p ("-f Like -s but take the ACL entries from `acl_file'. Acl_entries");
p (" are given one per line. Whitespace characters are ignored,");
p (" the character \"#\" may be used to start a comment. The");
p (" special filename \"-\" indicates reading from stdin.");
p ("");
p ("-m Add or modify one or more specified ACL entries. Acl_entries");
p (" is a comma-separated list of entries from the same list as");
p (" above.");
p ("");
p ("-d Delete one or more specified entries from the file's ACL.");
p (" The owner, group and others entries must not be deleted");
p (" Acl_entries are one or more comma-separated ACL entries");
p (" without permissions, taken from the following list:");
p ("");
p (" u[ser]:uid");
p (" g[roup]:gid");
p (" d[efault]:u[ser]:uid");
p (" d[efault]:g[roup]:gid");
p (" d[efault]:m[ask]:");
p (" d[efault]:o[ther]:");
p ("");
p ("-r Causes the permissions specified in the mask entry to be");
p (" ignored and replaced by the maximum permissions needed for");
p (" the file group class.");
p ("");
p ("While the -m and -d options may be used in the same command, the");
p ("-s and -f options may be used only exclusively.");
p ("");
p ("Directories may contain default ACL entries. Files created");
p ("in a directory that contains default ACL entries will have");
p ("permissions according to the combination of the current umask,");
p ("the explicit permissions requested and the default ACL entries");
p ("Note: Under Cygwin, the default ACL entries are not taken into");
p ("account currently.");
}
return 1;
}
struct option longopts[] = {
{"help", no_argument, NULL, 'h'},
{0, no_argument, NULL, 0}
};
int
main (int argc, char **argv)
{
extern char *optarg;
extern int optind;
int c;
action_t action = NoAction;
int ropt = 0;
aclent_t acls[MAX_ACL_ENTRIES];
int aclidx = 0;
myname = argv[0];
memset (acls, 0, sizeof acls);
while ((c = getopt_long (argc, argv, "d:f:m:rs:", longopts, NULL)) != EOF)
switch (c)
{
case 'd':
if (action == NoAction)
action = Delete;
else if (action == Modify)
action = ModNDel;
else
return usage (0);
if (! getaclentries (Delete, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", myname);
return 2;
}
break;
case 'f':
if (action == NoAction)
action = Set;
else
return usage (0);
if (! getaclentries (SetFromFile, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", myname);
return 2;
}
break;
case 'm':
if (action == NoAction)
action = Modify;
else if (action == Delete)
action = ModNDel;
else
return usage (0);
if (! getaclentries (Modify, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", myname);
return 2;
}
break;
case 'r':
if (!ropt)
ropt = 1;
else
return usage (0);
break;
case 's':
if (action == NoAction)
action = Set;
else
return usage (0);
break;
if (! getaclentries (Set, optarg, acls, &aclidx))
{
fprintf (stderr, "%s: illegal acl entries\n", myname);
return 2;
}
break;
case 'h':
return usage (1);
default:
return usage (0);
}
if (action == NoAction)
return usage (0);
if (optind > argc - 1)
return usage (0);
if (action == Set)
switch (aclcheck (acls, aclidx, NULL))
{
case GRP_ERROR:
fprintf (stderr, "%s: more than one group entry.\n", myname);
return 2;
case USER_ERROR:
fprintf (stderr, "%s: more than one user entry.\n", myname);
return 2;
case CLASS_ERROR:
fprintf (stderr, "%s: more than one mask entry.\n", myname);
return 2;
case OTHER_ERROR:
fprintf (stderr, "%s: more than one other entry.\n", myname);
return 2;
case DUPLICATE_ERROR:
fprintf (stderr, "%s: duplicate additional user or group.\n", myname);
return 2;
case ENTRY_ERROR:
fprintf (stderr, "%s: invalid entry type.\n", myname);
return 2;
case MISS_ERROR:
fprintf (stderr, "%s: missing entries.\n", myname);
return 2;
case MEM_ERROR:
fprintf (stderr, "%s: out of memory.\n", myname);
return 2;
default:
break;
}
for (c = optind; c < argc; ++c)
setfacl (action, argv[c], acls, aclidx);
return 0;
}
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