1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016--2018 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "slibtool_lconf_impl.h"
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
#include "slibtool_symlink_impl.h"
#include "slibtool_readlink_impl.h"
enum slbt_lconf_opt {
SLBT_LCONF_OPT_UNKNOWN,
SLBT_LCONF_OPT_NO,
SLBT_LCONF_OPT_YES,
};
static void slbt_lconf_close(int fdcwd, int fdlconfdir)
{
if (fdlconfdir != fdcwd)
close(fdlconfdir);
}
static int slbt_lconf_open(
struct slbt_driver_ctx * dctx,
const char * lconf)
{
int fdcwd;
int fdlconf;
int fdlconfdir;
int fdparent;
struct stat stcwd;
struct stat stparent;
fdcwd = slbt_driver_fdcwd(dctx);
fdlconfdir = fdcwd;
if (lconf)
return ((fdlconf = openat(fdcwd,lconf,O_RDONLY,0)) < 0)
? SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_LCONF_OPEN)
: fdlconf;
if (fstatat(fdlconfdir,".",&stcwd,0) < 0)
return SLBT_SYSTEM_ERROR(dctx);
fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
while (fdlconf < 0) {
fdparent = openat(fdlconfdir,"../",O_DIRECTORY,0);
slbt_lconf_close(fdcwd,fdlconfdir);
if (fdparent < 0)
return SLBT_SYSTEM_ERROR(dctx);
if (fstat(fdparent,&stparent) < 0) {
close(fdparent);
return SLBT_SYSTEM_ERROR(dctx);
}
if (stparent.st_dev != stcwd.st_dev) {
close(fdparent);
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_OPEN);
}
fdlconfdir = fdparent;
fdlconf = openat(fdlconfdir,"libtool",O_RDONLY,0);
}
slbt_lconf_close(fdcwd,fdlconfdir);
return fdlconf;
}
int slbt_get_lconf_flags(
struct slbt_driver_ctx * dctx,
const char * lconf,
uint64_t * flags)
{
int fdlconf;
struct stat st;
void * addr;
const char * mark;
const char * cap;
uint64_t optshared;
uint64_t optstatic;
int optlenmax;
int optsharedlen;
int optstaticlen;
const char * optsharedstr;
const char * optstaticstr;
/* open relative libtool script */
if ((fdlconf = slbt_lconf_open(dctx,lconf)) < 0)
return SLBT_NESTED_ERROR(dctx);
/* map relative libtool script */
if (fstat(fdlconf,&st) < 0)
return SLBT_SYSTEM_ERROR(dctx);
addr = mmap(
0,st.st_size,
PROT_READ,MAP_SHARED,
fdlconf,0);
close(fdlconf);
if (addr == MAP_FAILED)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_MAP);
mark = addr;
cap = &mark[st.st_size];
/* hard-coded options in the generated libtool precede the code */
if (st.st_size >= (optlenmax = strlen("build_libtool_libs=yes\n")))
cap -= optlenmax;
/* scan */
optshared = 0;
optstatic = 0;
optsharedstr = "build_libtool_libs=";
optstaticstr = "build_old_libs=";
optsharedlen = strlen(optsharedstr);
optstaticlen = strlen(optstaticstr);
for (; mark && mark<cap; ) {
if (!strncmp(mark,optsharedstr,optsharedlen)) {
mark += optsharedlen;
if ((mark[0]=='n')
&& (mark[1]=='o')
&& (mark[2]=='\n'))
optshared = SLBT_DRIVER_DISABLE_SHARED;
if ((mark[0]=='y')
&& (mark[1]=='e')
&& (mark[2]=='s')
&& (mark[3]=='\n'))
optshared = SLBT_DRIVER_SHARED;
} if (!strncmp(mark,optstaticstr,optstaticlen)) {
mark += optstaticlen;
if ((mark[0]=='n')
&& (mark[1]=='o')
&& (mark[2]=='\n'))
optstatic = SLBT_DRIVER_DISABLE_STATIC;
if ((mark[0]=='y')
&& (mark[1]=='e')
&& (mark[2]=='s')
&& (mark[3]=='\n'))
optstatic = SLBT_DRIVER_STATIC;
}
if (optshared && optstatic)
mark = 0;
else {
for (; (mark<cap) && (*mark!='\n'); )
mark++;
mark++;
}
}
munmap(addr,st.st_size);
if (!optshared || !optstatic)
return SLBT_CUSTOM_ERROR(
dctx,SLBT_ERR_LCONF_PARSE);
*flags = optshared | optstatic;
return 0;
}
|
