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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* Copyright © 2024 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdlib.h>
#ifdef _WIN32
#include <Windows.h>
#else
#include <errno.h>
#include <dlfcn.h>
#include <limits.h>
#include <link.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#include "intdefs.h"
#ifdef _WIN32
int os_lasterror(void) { return GetLastError(); }
// N.B. file handle values are 32-bit, even in 64-bit builds. I'm not crazy!
int os_open_read(const ushort *path) {
return (int)(ssize)CreateFileW(path, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, 0);
}
int os_open_write(const ushort *file) {
return (int)(ssize)CreateFileW(file, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL, 0);
}
int os_open_writetrunc(const ushort *file) {
return (int)(ssize)CreateFileW(file, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, 0, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL, 0);
}
int os_read(int f, void *buf, int max) {
ulong n;
return ReadFile((void *)(ssize)f, buf, max, &n, 0) ? n : -1;
}
int os_write(int f, const void *buf, int len) {
ulong n;
return WriteFile((void *)(ssize)f, buf, len, &n, 0) ? n : -1;
}
vlong os_fsize(int f) {
vlong ret;
if (!GetFileSizeEx((void *)(ssize)f, (LARGE_INTEGER *)&ret)) return -1;
return ret;
}
void os_close(int f) {
CloseHandle((void *)(ssize)f);
}
void os_getcwd(ushort buf[static 260]) { GetCurrentDirectoryW(260, buf); }
bool os_mkdir(const ushort *path) { return CreateDirectoryW(path, 0); }
bool os_unlink(const ushort *path) { return DeleteFileW(path); }
bool os_rmdir(const ushort *path) { return RemoveDirectoryW(path); }
int __stdcall ProcessPrng(char *data, usize sz); // from bcryptprimitives.dll
void os_randombytes(void *buf, int sz) { ProcessPrng(buf, sz); }
void *os_dlhandle(const ushort *name) {
return GetModuleHandleW(name);
}
void *os_dlsym(void *restrict lib, const char *restrict s) {
return (void *)GetProcAddress(lib, s);
}
int os_dlfile(void *lib, ushort *buf, int sz) {
unsigned int n = GetModuleFileNameW(lib, buf, sz);
if (n == 0 || n == sz) return -1;
// get the canonical capitalisation, as for some reason GetModuleFileName()
// returns all lowercase. this doesn't really matter except it looks nicer
GetLongPathNameW(buf, buf, n + 1);
// the drive letter will also be lower case, if it is an actual drive letter
// of course. it should be; I'm not gonna lose sleep over UNC paths and such
if (buf[0] >= L'a' && buf[0] <= L'z' && buf[1] == L':') buf[0] &= ~32u;
return n;
}
bool os_mprot(void *addr, int len, int mode) {
ulong old;
return !!VirtualProtect(addr, len, mode, &old);
}
#else
int os_lasterror(void) { return errno; }
int os_open_read(const char *path) {
return open(path, O_RDONLY | O_CLOEXEC);
}
int os_open_write(const char *path) {
return open(path, O_RDWR | O_CLOEXEC | O_CREAT, 0644);
}
int os_open_writetrunc(const char *path) {
return open(path, O_RDWR | O_CLOEXEC | O_CREAT | O_TRUNC, 0644);
}
int os_read(int f, void *buf, int max) { return read(f, buf, max); }
int os_write(int f, const void *buf, int max) { return write(f, buf, max); }
void os_close(int f) { close(f); }
vlong os_fsize(int f) {
struct stat s;
if (stat(f, &s) == -1) return -1;
return s.st_size;
}
void os_getcwd(char buf[PATH_MAX]) { getcwd(buf, PATH_MAX); }
bool os_mkdir(const char *path) { return mkdir(path, 0555) != -1; }
bool os_unlink(const char *path) { return unlink(path) != -1; }
bool os_rmdir(const char *path) { return rmdir(path) != -1; }
void *os_dlsym(void *restrict lib, const char *restrict name) {
return dlsym(lib, name);
}
bool os_mprot(void *addr, int len, int mode) {
// round down address and round up size
addr = (void *)((ulong)addr & ~(4095));
len = len + 4095 & ~(4095);
return mprotect(addr, len, mode) != -1;
}
void os_randombytes(void *buf, int sz) { while (getentropy(buf, sz) == -1); }
#endif
#ifdef __linux__
// glibc-specific stuff here. it shouldn't be used in build-time code, just
// the plugin itself (that really shouldn't be a problem).
// private struct hidden behind _GNU_SOURCE. see dlinfo(3) or <link.h>
struct link_map {
ulong l_addr;
const char *l_name;
void *l_ld;
struct link_map *l_next, *l_prev;
// [more private stuff below]
};
static struct link_map *lmbase = 0;
void *os_dlhandle(const char *name) {
extern struct link_map *lmbase; // note: defined in sst.c for now
if (!lmbase) { // IMPORTANT: not thread safe. don't forget later!
lmbase = (struct link_map *)dlopen("libc.so.6", RTLD_LAZY | RTLD_NOLOAD);
dlclose(lmbase); // assume success
while (lmbase->l_prev) lmbase = lmbase->l_prev;
}
// this is a tiny bit crude, but basically okay. we just want to find
// something that roughly matches the basename, rather than needing an exact
// path, in a manner vaguely similar to Windows' GetModuleHandle(). that way
// we can just look up client.so or something without having to figure out
// where exactly that is.
for (struct link_map *lm = lmbase; lm; lm = lm->l_next) {
if (name[0] == '/') {
if (!strcmp(name, lm->l_name)) return lm;
continue;
}
int namelen = strlen(lm->l_name);
int sublen = strlen(name);
if (sublen >= namelen) continue;
if (lm->l_name[namelen - sublen - 1] == '/' && !memcmp(
lm->l_name + namelen - sublen, name, sublen)) {
return lm;
}
}
return 0;
}
int os_dlfile(void *lib, char *buf, int sz) {
struct link_map *lm = lib;
int ssz = strlen(lm->l_name) + 1;
if (ssz > sz) { errno = ENAMETOOLONG; return -1; }
memcpy(buf, lm->l_name, ssz);
return ssz;
}
#endif
// vi: sw=4 ts=4 noet tw=80 cc=80
|
