163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
/*
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Copyright (C) 2016-2019 The University of Notre Dame
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This software is distributed under the GNU General Public License.
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See the file LICENSE for details.
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*/
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#include "is_valid.h"
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#include "string.h"
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#include "kobject.h"
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#include "process.h"
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#include "kmalloc.h"
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// Does this string comprise a valid path?
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// Valid paths are comprised of the following characters:
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// CHARS | ASCII CODE
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// '-' | 45
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// '.' | 46
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// '/' | 47
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// [0-9] | [48-57]
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// [a-z] | [65-90]
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// '_' | 95
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// [A-Z] | [97-122]
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int is_valid_path(const char * s)
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{
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int length = strlen(s);
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for (int i = 0; i < length; i++) {
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if (s[i] < 45) return 0;
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if (s[i] > 57 && s[i] < 65) return 0;
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if (s[i] > 90 && s[i] < 95) return 0;
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if (s[i] > 95 && s[i] < 97) return 0;
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if (s[i] > 122) return 0;
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}
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return 1;
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}
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// Does this string comprise a valid tag?
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// CHARS | ASCII CODE
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// [0-9] | [48-57]
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// [a-z] | [65-90]
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// [A-Z] | [97-122]
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int is_valid_tag(const char * s)
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{
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int length = strlen(s);
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for (int i = 0; i < length; i++) {
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if (s[i] < 48) return 0;
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if (s[i] > 57 && s[i] < 65) return 0;
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if (s[i] > 90 && s[i] < 95) return 0;
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if (s[i] > 95 && s[i] < 97) return 0;
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if (s[i] > 122) return 0;
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}
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return 1;
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}
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// Does this string point to a valid resource (i.e. is it a legitimate
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// tag-path concatenation)?
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// CHARS | ASCII CODE
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// ':' | 58
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int is_valid_location(const char * s)
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{
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int length = strlen(s);
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char * mutable_test = kmalloc(sizeof(char) * (length+1));
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strcpy(mutable_test, s);
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int path_index = 0;
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while (path_index < length && s[path_index] != 58) {
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path_index += 1;
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}
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mutable_test[path_index++] = 0;
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if (is_valid_tag(mutable_test)
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&& is_valid_path(mutable_test + path_index)) {
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return 1;
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}
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return 0;
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}
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// Return true if file desciptor is in range and refers to a live object.
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int is_valid_object( int fd )
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{
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return fd>=0 && fd<PROCESS_MAX_OBJECTS && current->ktable[fd];
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}
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// Return true if fd valid and object is also of indicated type.
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int is_valid_object_type( int fd, kobject_type_t type )
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{
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return is_valid_object(fd) && kobject_get_type(current->ktable[fd])==type;
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}
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// Return true if (ptr,length) describes a valid area in user space.
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// XXX Needs to be implemented!
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int is_valid_pointer( void *ptr, int length )
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{
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return 1;
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}
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// Return true if string points to a valid area in user space.
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// XXX Needs to be implemented!
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int is_valid_string( const char *str )
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{
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return 1;
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}
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#ifdef TEST
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void is_valid_test()
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{
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printf("Testing PATH validations...\n");
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char * s = "/root/is-valid.path";
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if (!is_valid_path(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "abcdefghijklmnopqrstuvwxyz";
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if (!is_valid_path(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if (!is_valid_path(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "0123456789";
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if (!is_valid_path(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "/root/isn't/valid:";
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if (is_valid_path(s))
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printf("ERROR: Did not invalidate %s\n", s);
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printf("Testing Tag Validations...\n");
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s = "TAG";
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if (!is_valid_tag(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "abcdefghijklmnopqrstuvwxyz";
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if (!is_valid_tag(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if (!is_valid_tag(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "0123456789";
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if (!is_valid_tag(s))
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printf("ERROR: Did not validate %s\n", s);
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s = ":NOT-A-TAG";
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if (is_valid_tag(s))
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printf("ERROR: Did not invalidate %s\n", s);
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printf("Testing Location Validations...\n");
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s = "HOME:path/to/root/dir";
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if (!is_valid_location(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "TAG";
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if (!is_valid_tag(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "/root/is-valid.path";
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if (!is_valid_path(s))
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printf("ERROR: Did not validate %s\n", s);
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s = "BAD-TAG:p@th/:/root/dir";
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if (is_valid_location(s))
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printf("ERROR: Did not invalidate %s\n", s);
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}
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#endif
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