Annotation of src/usr.bin/rdist/isexec.c, Revision 1.4
1.3 deraadt 1: /* $OpenBSD$ */
2:
1.1 dm 3: /*
4: * Copyright (c) 1983 Regents of the University of California.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35: #ifndef lint
1.4 ! millert 36: #if 0
1.1 dm 37: static char RCSid[] =
1.4 ! millert 38: "$From: isexec.c,v 6.21 1994/04/01 23:44:10 mcooper Exp $";
! 39: #else
! 40: static char RCSid[] =
! 41: "$OpenBSD$";
! 42: #endif
1.1 dm 43:
44: static char sccsid[] = "@(#)client.c";
45:
46: static char copyright[] =
47: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
48: All rights reserved.\n";
49: #endif /* not lint */
50:
51:
52: #include "defs.h"
53:
54: #if EXE_TYPE == EXE_AOUT
55: /*
56: * BSD style A.OUT
57: */
58: #include <a.out.h>
59:
60: static int _isexec(fd)
61: int fd;
62: {
63: struct exec ehdr;
64:
65: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
66: !N_BADMAG(ehdr))
67: return(TRUE);
68: else
69: return(FALSE);
70: }
71: #endif /* EXE_AOUT */
72:
73:
74: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF
75: /*
76: * Elf
77: */
78: #include <elf.h>
79: #define ISELF(h) (h.e_type == ET_EXEC)
80: #endif /* EXE_ELF_AND_COFF || EXE_ELF */
81:
82: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF
83:
84: /*
85: * COFF
86: */
87: #if defined(FILEHDR_H)
88: #include FILEHDR_H
89: #endif /* FILEHDR_H */
90:
91: #if !defined(ISCOFF)
92:
93: /*
94: * Stupid AIX
95: */
96: #if defined(U802WRMAGIC) && defined(U802ROMAGIC) && defined(U802TOCMAGIC)
97: #define ISCOFF(x) (((x)==U802WRMAGIC) || ((x)==U802TOCMAGIC) || \
98: ((x)==U802TOCMAGIC))
99: #endif /* U802... */
100: /*
101: * Stupid Umax4.3
102: */
103: #if defined(NS32GMAGIC) || defined(NS32SMAGIC)
104: #define ISCOFF(x) (((x)==NS32GMAGIC) || ((x)==NS32SMAGIC))
105: #endif /* NS32 ... */
106:
107: #endif /* ISCOFF */
108:
109: #endif /* EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF */
110:
111: #if EXE_TYPE == EXE_ELF_AND_COFF
112: /*
113: * ELF and COFF
114: */
115: typedef union {
116: struct filehdr coffhdr;
117: Elf32_Ehdr elfhdr;
118: } hdr_t;
119: #endif /* EXE_TYPE == EXE_ELF_AND_COFF */
120:
121: #if EXE_TYPE == EXE_ELF
122: /*
123: * Elf
124: */
125: #include <elf.h>
126: typedef Elf32_Ehdr hdr_t;
127: #endif /* EXE_TYPE == EXE_ELF */
128:
129: #if EXE_TYPE == EXE_COFF
130: /*
131: * COFF
132: */
133:
134: #if defined(FILEHDR_H)
135: #include FILEHDR_H
136: #endif /* FILEHDR_H */
137:
138: typedef struct filehdr hdr_t;
139: #endif /* EXE_TYPE == EXE_COFF */
140:
141: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF || EXE_TYPE == EXE_COFF
142: /*
143: * System V style COFF and System V R4 style ELF
144: */
145: static int _isexec(fd)
146: int fd;
147: {
148: hdr_t hdr;
149:
150: if (read(fd, &hdr, sizeof(hdr)) == sizeof(hdr)) {
151: #if EXE_TYPE == EXE_ELF_AND_COFF
152: if (ISELF(hdr.elfhdr) || ISCOFF(hdr.coffhdr.f_magic))
153: return(TRUE);
154: #endif
155: #if EXE_TYPE == EXE_ELF
156: if (ISELF(hdr))
157: return(TRUE);
158: #endif
159: #if EXE_TYPE == EXE_COFF
160: if (ISCOFF(hdr.f_magic))
161: return(TRUE);
162: #endif
163: }
164:
165: return(FALSE);
166: }
167: #endif /* EXE_ELF_AND_COFF */
168:
169:
170: #if EXE_TYPE == EXE_MACHO
171: /*
172: * Mach-O format
173: */
174:
175: #if defined(NEXTSTEP) && NEXTSTEP >= 3
176: # include <mach-o/loader.h>
177: #else
178: # include <sys/loader.h>
179: #endif /* NEXTSTEP */
180:
181: #ifndef MH_CIGAM
182: #define MH_CIGAM 0xcefaedfe
183: #endif
184: #ifndef FAT_MAGIC
185: #define FAT_MAGIC 0xcafebabe
186: #endif
187: #ifndef FAT_CIGAM
188: #define FAT_CIGAM 0xbebafeca
189: #endif
190:
191: static int _isexec(fd)
192: int fd;
193: {
194: struct mach_header ehdr;
195:
196: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
197: (ehdr.magic == MH_MAGIC || ehdr.magic == MH_CIGAM ||
198: ehdr.magic == FAT_MAGIC || ehdr.magic == FAT_CIGAM))
199: return(TRUE);
200: else
201: return(FALSE);
202: }
203: #endif /* EXE_COFF */
204:
205:
206: #if EXE_TYPE == EXE_HPEXEC
207: /*
208: * HP 9000 executable format
209: */
210:
211: #ifdef hp9000s300
212:
213: #include <a.out.h>
214: #define header exec
215: #define ISEXEC(a) ((a.file_type)==EXEC_MAGIC || (a.file_type)==SHARE_MAGIC || \
216: (a.file_type)==DEMAND_MAGIC)
217:
218: #else /* ! hp9000s300 */
219:
220: #define ISEXEC(a) ((a)==EXEC_MAGIC || (a)==SHARE_MAGIC || (a)==DEMAND_MAGIC)
221: #include <filehdr.h>
222:
223: #endif /* hp9000s300 */
224:
225: static int _isexec(fd)
226: int fd;
227: {
228: struct header ehdr;
229:
230: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
231: ISEXEC(ehdr.a_magic))
232: return(TRUE);
233: else
234: return(FALSE);
235: }
236: #endif /* EXE_HPEXEC */
237:
238:
239: #if !defined(EXE_TYPE)
240: /*
241: * Fake _isexec() call for unknown executable formats.
242: */
243: static int _isexec(fd)
244: /*ARGSUSED*/
245: int fd;
246: {
247: return(FALSE);
248: }
249: #endif /* !defined(EXE_TYPE) */
250:
251: /*
252: * Determine whether 'file' is an executable or not.
253: */
254: extern int isexec(file, statp)
255: char *file;
256: struct stat *statp;
257: {
258: int fd, r;
259:
260: /*
261: * Must be a regular file that has some executable mode bit on
262: */
263: if (!S_ISREG(statp->st_mode) ||
264: !(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
265: return(FALSE);
266:
267: if ((fd = open(file, O_RDONLY, 0)) < 0)
268: return(FALSE);
269: r = _isexec(fd);
270: (void) close(fd);
271:
272: return(r);
273: }
274:
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