Annotation of src/usr.bin/rdist/isexec.c, Revision 1.2
1.1 dm 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: */
33: #ifndef lint
34: static char RCSid[] =
35: "$Id: isexec.c,v 6.21 1994/04/01 23:44:10 mcooper Exp $";
36:
37: static char sccsid[] = "@(#)client.c";
38:
39: static char copyright[] =
40: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
41: All rights reserved.\n";
42: #endif /* not lint */
43:
44:
45: #include "defs.h"
46:
47: #if EXE_TYPE == EXE_AOUT
48: /*
49: * BSD style A.OUT
50: */
51: #include <a.out.h>
52:
53: static int _isexec(fd)
54: int fd;
55: {
56: struct exec ehdr;
57:
58: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
59: !N_BADMAG(ehdr))
60: return(TRUE);
61: else
62: return(FALSE);
63: }
64: #endif /* EXE_AOUT */
65:
66:
67: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF
68: /*
69: * Elf
70: */
71: #include <elf.h>
72: #define ISELF(h) (h.e_type == ET_EXEC)
73: #endif /* EXE_ELF_AND_COFF || EXE_ELF */
74:
75: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF
76:
77: /*
78: * COFF
79: */
80: #if defined(FILEHDR_H)
81: #include FILEHDR_H
82: #endif /* FILEHDR_H */
83:
84: #if !defined(ISCOFF)
85:
86: /*
87: * Stupid AIX
88: */
89: #if defined(U802WRMAGIC) && defined(U802ROMAGIC) && defined(U802TOCMAGIC)
90: #define ISCOFF(x) (((x)==U802WRMAGIC) || ((x)==U802TOCMAGIC) || \
91: ((x)==U802TOCMAGIC))
92: #endif /* U802... */
93: /*
94: * Stupid Umax4.3
95: */
96: #if defined(NS32GMAGIC) || defined(NS32SMAGIC)
97: #define ISCOFF(x) (((x)==NS32GMAGIC) || ((x)==NS32SMAGIC))
98: #endif /* NS32 ... */
99:
100: #endif /* ISCOFF */
101:
102: #endif /* EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF */
103:
104: #if EXE_TYPE == EXE_ELF_AND_COFF
105: /*
106: * ELF and COFF
107: */
108: typedef union {
109: struct filehdr coffhdr;
110: Elf32_Ehdr elfhdr;
111: } hdr_t;
112: #endif /* EXE_TYPE == EXE_ELF_AND_COFF */
113:
114: #if EXE_TYPE == EXE_ELF
115: /*
116: * Elf
117: */
118: #include <elf.h>
119: typedef Elf32_Ehdr hdr_t;
120: #endif /* EXE_TYPE == EXE_ELF */
121:
122: #if EXE_TYPE == EXE_COFF
123: /*
124: * COFF
125: */
126:
127: #if defined(FILEHDR_H)
128: #include FILEHDR_H
129: #endif /* FILEHDR_H */
130:
131: typedef struct filehdr hdr_t;
132: #endif /* EXE_TYPE == EXE_COFF */
133:
134: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF || EXE_TYPE == EXE_COFF
135: /*
136: * System V style COFF and System V R4 style ELF
137: */
138: static int _isexec(fd)
139: int fd;
140: {
141: hdr_t hdr;
142:
143: if (read(fd, &hdr, sizeof(hdr)) == sizeof(hdr)) {
144: #if EXE_TYPE == EXE_ELF_AND_COFF
145: if (ISELF(hdr.elfhdr) || ISCOFF(hdr.coffhdr.f_magic))
146: return(TRUE);
147: #endif
148: #if EXE_TYPE == EXE_ELF
149: if (ISELF(hdr))
150: return(TRUE);
151: #endif
152: #if EXE_TYPE == EXE_COFF
153: if (ISCOFF(hdr.f_magic))
154: return(TRUE);
155: #endif
156: }
157:
158: return(FALSE);
159: }
160: #endif /* EXE_ELF_AND_COFF */
161:
162:
163: #if EXE_TYPE == EXE_MACHO
164: /*
165: * Mach-O format
166: */
167:
168: #if defined(NEXTSTEP) && NEXTSTEP >= 3
169: # include <mach-o/loader.h>
170: #else
171: # include <sys/loader.h>
172: #endif /* NEXTSTEP */
173:
174: #ifndef MH_CIGAM
175: #define MH_CIGAM 0xcefaedfe
176: #endif
177: #ifndef FAT_MAGIC
178: #define FAT_MAGIC 0xcafebabe
179: #endif
180: #ifndef FAT_CIGAM
181: #define FAT_CIGAM 0xbebafeca
182: #endif
183:
184: static int _isexec(fd)
185: int fd;
186: {
187: struct mach_header ehdr;
188:
189: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
190: (ehdr.magic == MH_MAGIC || ehdr.magic == MH_CIGAM ||
191: ehdr.magic == FAT_MAGIC || ehdr.magic == FAT_CIGAM))
192: return(TRUE);
193: else
194: return(FALSE);
195: }
196: #endif /* EXE_COFF */
197:
198:
199: #if EXE_TYPE == EXE_HPEXEC
200: /*
201: * HP 9000 executable format
202: */
203:
204: #ifdef hp9000s300
205:
206: #include <a.out.h>
207: #define header exec
208: #define ISEXEC(a) ((a.file_type)==EXEC_MAGIC || (a.file_type)==SHARE_MAGIC || \
209: (a.file_type)==DEMAND_MAGIC)
210:
211: #else /* ! hp9000s300 */
212:
213: #define ISEXEC(a) ((a)==EXEC_MAGIC || (a)==SHARE_MAGIC || (a)==DEMAND_MAGIC)
214: #include <filehdr.h>
215:
216: #endif /* hp9000s300 */
217:
218: static int _isexec(fd)
219: int fd;
220: {
221: struct header ehdr;
222:
223: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
224: ISEXEC(ehdr.a_magic))
225: return(TRUE);
226: else
227: return(FALSE);
228: }
229: #endif /* EXE_HPEXEC */
230:
231:
232: #if !defined(EXE_TYPE)
233: /*
234: * Fake _isexec() call for unknown executable formats.
235: */
236: static int _isexec(fd)
237: /*ARGSUSED*/
238: int fd;
239: {
240: return(FALSE);
241: }
242: #endif /* !defined(EXE_TYPE) */
243:
244: /*
245: * Determine whether 'file' is an executable or not.
246: */
247: extern int isexec(file, statp)
248: char *file;
249: struct stat *statp;
250: {
251: int fd, r;
252:
253: /*
254: * Must be a regular file that has some executable mode bit on
255: */
256: if (!S_ISREG(statp->st_mode) ||
257: !(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
258: return(FALSE);
259:
260: if ((fd = open(file, O_RDONLY, 0)) < 0)
261: return(FALSE);
262: r = _isexec(fd);
263: (void) close(fd);
264:
265: return(r);
266: }
267:
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