Annotation of src/usr.bin/rdist/isexec.c, Revision 1.7
1.7 ! millert 1: /* $OpenBSD: isexec.c,v 1.6 2003/05/14 01:34:35 millert Exp $ */
1.3 deraadt 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.
1.7 ! millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 dm 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.6 millert 31:
32: #include "defs.h"
33:
1.1 dm 34: #ifndef lint
1.4 millert 35: #if 0
1.6 millert 36: static char RCSid[] __attribute__((__unused__)) =
37: "$From: isexec.c,v 1.2 1999/08/04 15:57:33 christos Exp $";
1.4 millert 38: #else
1.6 millert 39: static char RCSid[] __attribute__((__unused__)) =
1.7 ! millert 40: "$OpenBSD: isexec.c,v 1.6 2003/05/14 01:34:35 millert Exp $";
1.4 millert 41: #endif
1.1 dm 42:
1.6 millert 43: static char sccsid[] __attribute__((__unused__)) =
44: "@(#)client.c";
1.1 dm 45:
1.6 millert 46: static char copyright[] __attribute__((__unused__)) =
1.1 dm 47: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
48: All rights reserved.\n";
49: #endif /* not lint */
50:
1.6 millert 51: static int _isexec(int);
1.1 dm 52:
53: #if EXE_TYPE == EXE_AOUT
54: /*
55: * BSD style A.OUT
56: */
57: #include <a.out.h>
58:
1.6 millert 59: static int
60: _isexec(int fd)
1.1 dm 61: {
62: struct exec ehdr;
63:
64: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
65: !N_BADMAG(ehdr))
66: return(TRUE);
67: else
68: return(FALSE);
69: }
70: #endif /* EXE_AOUT */
71:
72:
73: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF
74: /*
75: * Elf
76: */
1.5 millert 77: #include <elf_abi.h>
1.1 dm 78: #define ISELF(h) (h.e_type == ET_EXEC)
79: #endif /* EXE_ELF_AND_COFF || EXE_ELF */
80:
81: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF
82:
83: /*
84: * COFF
85: */
86: #if defined(FILEHDR_H)
87: #include FILEHDR_H
88: #endif /* FILEHDR_H */
89:
90: #if !defined(ISCOFF)
91:
92: /*
93: * Stupid AIX
94: */
95: #if defined(U802WRMAGIC) && defined(U802ROMAGIC) && defined(U802TOCMAGIC)
96: #define ISCOFF(x) (((x)==U802WRMAGIC) || ((x)==U802TOCMAGIC) || \
97: ((x)==U802TOCMAGIC))
98: #endif /* U802... */
99: /*
100: * Stupid Umax4.3
101: */
102: #if defined(NS32GMAGIC) || defined(NS32SMAGIC)
103: #define ISCOFF(x) (((x)==NS32GMAGIC) || ((x)==NS32SMAGIC))
104: #endif /* NS32 ... */
105:
106: #endif /* ISCOFF */
107:
108: #endif /* EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF */
109:
110: #if EXE_TYPE == EXE_ELF_AND_COFF
111: /*
112: * ELF and COFF
113: */
114: typedef union {
115: struct filehdr coffhdr;
116: Elf32_Ehdr elfhdr;
117: } hdr_t;
118: #endif /* EXE_TYPE == EXE_ELF_AND_COFF */
119:
120: #if EXE_TYPE == EXE_ELF
121: /*
122: * Elf
123: */
124: typedef Elf32_Ehdr hdr_t;
125: #endif /* EXE_TYPE == EXE_ELF */
126:
127: #if EXE_TYPE == EXE_COFF
128: /*
129: * COFF
130: */
131:
132: #if defined(FILEHDR_H)
133: #include FILEHDR_H
134: #endif /* FILEHDR_H */
135:
136: typedef struct filehdr hdr_t;
137: #endif /* EXE_TYPE == EXE_COFF */
138:
139: #if EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF || EXE_TYPE == EXE_COFF
140: /*
141: * System V style COFF and System V R4 style ELF
142: */
1.6 millert 143: static int
144: _isexec(int fd)
1.1 dm 145: {
146: hdr_t hdr;
147:
148: if (read(fd, &hdr, sizeof(hdr)) == sizeof(hdr)) {
149: #if EXE_TYPE == EXE_ELF_AND_COFF
150: if (ISELF(hdr.elfhdr) || ISCOFF(hdr.coffhdr.f_magic))
151: return(TRUE);
152: #endif
153: #if EXE_TYPE == EXE_ELF
154: if (ISELF(hdr))
155: return(TRUE);
156: #endif
157: #if EXE_TYPE == EXE_COFF
158: if (ISCOFF(hdr.f_magic))
159: return(TRUE);
160: #endif
161: }
162:
163: return(FALSE);
164: }
165: #endif /* EXE_ELF_AND_COFF */
166:
167:
168: #if EXE_TYPE == EXE_MACHO
169: /*
170: * Mach-O format
171: */
172:
173: #if defined(NEXTSTEP) && NEXTSTEP >= 3
174: # include <mach-o/loader.h>
175: #else
176: # include <sys/loader.h>
177: #endif /* NEXTSTEP */
178:
179: #ifndef MH_CIGAM
180: #define MH_CIGAM 0xcefaedfe
181: #endif
182: #ifndef FAT_MAGIC
183: #define FAT_MAGIC 0xcafebabe
184: #endif
185: #ifndef FAT_CIGAM
186: #define FAT_CIGAM 0xbebafeca
187: #endif
188:
1.6 millert 189: static int
190: _isexec(int fd)
1.1 dm 191: {
192: struct mach_header ehdr;
193:
194: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
195: (ehdr.magic == MH_MAGIC || ehdr.magic == MH_CIGAM ||
196: ehdr.magic == FAT_MAGIC || ehdr.magic == FAT_CIGAM))
197: return(TRUE);
198: else
199: return(FALSE);
200: }
201: #endif /* EXE_COFF */
202:
203:
204: #if EXE_TYPE == EXE_HPEXEC
205: /*
206: * HP 9000 executable format
207: */
208:
209: #ifdef hp9000s300
210:
211: #include <a.out.h>
212: #define header exec
213: #define ISEXEC(a) ((a.file_type)==EXEC_MAGIC || (a.file_type)==SHARE_MAGIC || \
214: (a.file_type)==DEMAND_MAGIC)
215:
216: #else /* ! hp9000s300 */
217:
218: #define ISEXEC(a) ((a)==EXEC_MAGIC || (a)==SHARE_MAGIC || (a)==DEMAND_MAGIC)
219: #include <filehdr.h>
220:
221: #endif /* hp9000s300 */
222:
1.6 millert 223: static int
224: _isexec(int fd)
1.1 dm 225: {
226: struct header ehdr;
227:
228: if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
229: ISEXEC(ehdr.a_magic))
230: return(TRUE);
231: else
232: return(FALSE);
233: }
234: #endif /* EXE_HPEXEC */
235:
236:
237: #if !defined(EXE_TYPE)
238: /*
239: * Fake _isexec() call for unknown executable formats.
240: */
1.6 millert 241: static int
242: _isexec(int fd)
1.1 dm 243: {
244: return(FALSE);
245: }
246: #endif /* !defined(EXE_TYPE) */
247:
248: /*
249: * Determine whether 'file' is an executable or not.
250: */
1.6 millert 251: int
252: isexec(char *file, struct stat *statp)
1.1 dm 253: {
254: int fd, r;
255:
256: /*
257: * Must be a regular file that has some executable mode bit on
258: */
259: if (!S_ISREG(statp->st_mode) ||
260: !(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
261: return(FALSE);
262:
263: if ((fd = open(file, O_RDONLY, 0)) < 0)
264: return(FALSE);
265: r = _isexec(fd);
266: (void) close(fd);
267:
268: return(r);
269: }
270:
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