1 /* @(#) $Id: ./src/rootcheck/os_string.c, 2011/09/08 dcid Exp $
4 /* Included and modified strings.c from the OpenBSD project.
9 * Copyright (c) 1980, 1987, 1993
10 * The Regents of the University of California. All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #include <sys/types.h>
50 #include <netinet/in.h>
53 /* Again, making solaris happy... */
55 #include <sys/exechdr.h>
57 #elif defined Darwin || defined HPUX
59 /* For some reason darwin does not have that */
62 unsigned long a_info; /* Use macros N_MAGIC, etc for access */
63 unsigned char a_machtype; /* machine type */
64 unsigned short a_magic; /* magic number */
65 unsigned a_text; /* length of text, in bytes */
66 unsigned a_data; /* length of data, in bytes */
67 unsigned a_bss; /* length of uninitialized data area for file, in bytes */
68 unsigned a_syms; /* length of symbol table data in file, in bytes */
69 unsigned a_entry; /* start address */
70 unsigned a_trsize; /* length of relocation info for text, in bytes */
71 unsigned a_drsize; /* length of relocation info for data, in bytes */
73 #define OMAGIC 0407 /* Object file or impure executable. */
74 #define NMAGIC 0410 /* Code indicating pure executable. */
75 #define ZMAGIC 0413 /* Code indicating demand-paged executable. */
76 #define BMAGIC 0415 /* Used by a b.out object. */
86 #define PAGSIZ 0x02000
90 #define OLD_PAGSIZ 0x00800
97 (((x).magic)!=U802TOCMAGIC && ((x).magic)!=U803TOCMAGIC && ((x).magic)!=U803XTOCMAGIC && ((x).magic)!=U64_TOCMAGIC)
100 (((x).a_magic)!=OMAGIC && ((x).a_magic)!=NMAGIC && ((x).a_magic)!=ZMAGIC)
103 #endif /* N_BADMAG */
106 #define N_PAGSIZ(x) \
107 ((x).a_machtype == M_OLDSUN2? OLD_PAGSIZ : PAGSIZ)
113 #define N_TXTOFF(x) \
115 ((x).magic==U64_TOCMAGIC ? 0 : sizeof (struct aouthdr))
117 #define N_TXTOFF(x) \
119 ((x).a_machtype == M_OLDSUN2 \
120 ? ((x).a_magic==ZMAGIC ? N_PAGSIZ(x) : sizeof (struct exec)) \
121 : ((x).a_magic==ZMAGIC ? 0 : sizeof (struct exec)) )
124 #endif /* N_TXTOFF */
127 #include "headers/defs.h"
128 #include "headers/debug_op.h"
129 #include "headers/regex_op.h"
131 #include "error_messages/error_messages.h"
133 #define STR_MINLEN 4 /* Minumum length for a string */
135 #define ISSTR(ch) (isascii(ch) && (isprint(ch) || ch == '\t'))
139 typedef struct aouthdr EXEC;
141 typedef struct exec EXEC;
144 typedef struct _os_strings
150 unsigned char hbfr[sizeof(EXEC)];
155 /* os_getch: Read each character from a binary file */
156 int os_getch(os_strings *oss);
159 /* os_strings: List the strings of a binary and
160 * check if the regex given is there.
162 int os_string(char *file, char *regex)
169 char line[OS_SIZE_1024 +1];
176 /* Return didn't match */
183 /* Allocating for the buffer */
184 bfr = calloc(STR_MINLEN + 2, sizeof(char *));
187 merror(MEM_ERROR, ARGV0);
191 /* Opening the file */
192 oss.fp = fopen(file, "r");
199 /* cleaning the line */
200 memset(line, '\0', OS_SIZE_1024 +1);
202 /* starting .. (from old strings.c) */
207 head = (EXEC *)oss.hbfr;
210 if ((oss.head_len = read(fileno(oss.fp), head, sizeof(EXEC))) == -1)
215 else if (oss.head_len == sizeof(EXEC) && !N_BADMAG(*head))
217 oss.foff = N_TXTOFF(*head);
218 if (fseek(stdin, oss.foff, SEEK_SET) == -1)
225 oss.read_len = head->tsize + head->dsize;
227 oss.read_len = head->a_text + head->a_data;
238 /* Read the file and perform the regex comparison */
239 for (cnt = 0; (ch = os_getch(&oss)) != EOF;)
246 if (++cnt < STR_MINLEN)
249 strncpy(line, (char *)bfr, STR_MINLEN +1);
254 while ((ch = os_getch(&oss)) != EOF && ISSTR(ch))
256 if(cnt < OS_SIZE_1024)
271 if(OS_PRegex(line, regex))
291 * getch (os_getch, modified)--
292 * get next character from wherever
294 int os_getch(os_strings *oss)
299 if (oss->hcnt < oss->head_len)
300 return((int)oss->hbfr[oss->hcnt++]);
303 if (oss->read_len == -1 || oss->read_len-- > 0)
305 return(fgetc(oss->fp));
312 int os_string(char *file, char *regex)