summaryrefslogtreecommitdiff
path: root/src/archive/mdso_argen_common.c
blob: 2d2f3c5bc99bf476756aa2da80e5db823166d322 (plain)
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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/****************************************************************/
/*  mdso: midipix dso scavenger                                 */
/*  Copyright (C) 2015--2024  SysDeer Technologies, LLC         */
/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
/****************************************************************/

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>

#include <mdso/mdso.h>
#include "mdso_object_impl.h"
#include "mdso_errinfo_impl.h"
#include "perk_structs.h"

static void mdso_obj_write_objname(char * ch, off_t objidx)
{
	ch[0] = 's';

	ch[6] = (objidx % 10) + '0'; objidx /= 10;
	ch[5] = (objidx % 10) + '0'; objidx /= 10;
	ch[4] = (objidx % 10) + '0'; objidx /= 10;
	ch[3] = (objidx % 10) + '0'; objidx /= 10;
	ch[2] = (objidx % 10) + '0'; objidx /= 10;
	ch[1] = (objidx % 10) + '0'; objidx /= 10;

	ch[7] = '.';
	ch[8] = 'o';
}

static void mdso_argen_common_hdr(
	struct pe_raw_archive_common_hdr *	arhdr,
	char *					file_id,
	size_t					size)
{
	size_t	slen;

	memset(arhdr,0x20,sizeof(*arhdr));

	slen = strlen(file_id);
	memcpy(arhdr->ar_file_id,file_id,slen);
	arhdr->ar_file_id[slen] = '/';

	arhdr->ar_uid[0] = '0';
	arhdr->ar_gid[0] = '0';
	arhdr->ar_file_mode[0] = '0';
	arhdr->ar_time_date_stamp[0] = '0';

	mdso_obj_write_dec(arhdr->ar_file_size,size);

	arhdr->ar_end_tag[0] = 0x60;
	arhdr->ar_end_tag[1] = 0x0a;
}

static void mdso_write_big_endian_long(unsigned char * ch, uint32_t val)
{
	ch[3] = val;
	ch[2] = val >> 8;
	ch[1] = val >> 16;
	ch[0] = val >> 24;
}

int  mdso_argen_common(
	const struct mdso_driver_ctx *	dctx,
	const char **			symv,
	struct mdso_object *		vobj)
{
	int					ret;
	const char **				psym;
	intptr_t				nobj;
	uint32_t				objlen;
	uint32_t				hdrlen;
	uint32_t				mapstrsnum;
	uint32_t				mapstrslen;
	uint32_t				symidx;
	void *					addr;
	unsigned char *				ar;
	unsigned char *				mark;
	unsigned char *				idx;
	char *					mapstrs;
	struct pe_raw_archive_common_hdr *	arhdr;
	struct mdso_object *			pobj;
	struct mdso_object *			aobj;
	struct mdso_object			sobj[256];
	char					objname[16];

	/* init */
	memset(sobj,0,sizeof(sobj));

	for (psym=symv; *psym; psym++)
		(void)0;

	if ((nobj = psym - symv) < 255)
		aobj = sobj;

	else if (nobj > 1024*1024)
		return MDSO_CUSTOM_ERROR(dctx,MDSO_ERR_INVALID_VECTOR);

	else if (!(aobj = calloc(1,++nobj*sizeof(*aobj))))
		return MDSO_SYSTEM_ERROR(dctx);

	/* objlen: archive signature, index header */
	objlen  = 8;
	objlen += sizeof(struct pe_raw_archive_common_hdr);

	/* objlen: member headers */
	ret = mdso_objgen_dsometa(dctx,aobj);

	aobj->size += 1;
	aobj->size |= 1;
	aobj->size ^= 1;

	objlen += aobj->size;
	objlen += sizeof(struct pe_raw_archive_common_hdr);

	mapstrslen = aobj->mapstrslen;
	mapstrsnum = aobj->mapstrsnum;

	/* objlen: symentry */
	for (psym=symv,pobj=&aobj[1]; *psym && !ret; psym++) {
		ret = mdso_objgen_symentry(dctx,*psym,pobj);

		pobj->size += 1;
		pobj->size |= 1;
		pobj->size ^= 1;

		objlen += pobj->size;
		objlen += sizeof(struct pe_raw_archive_common_hdr);

		mapstrslen += pobj->mapstrslen;
		mapstrsnum += pobj->mapstrsnum;
		pobj++;
	}

	/* verify logic */
	if (ret && (aobj == sobj))
		return MDSO_NESTED_ERROR(dctx);

	if (ret) {
		free(aobj);
		return MDSO_NESTED_ERROR(dctx);
	}

	/* index: string block alignment */
	mapstrslen += 1;
	mapstrslen |= 1;
	mapstrslen ^= 1;

	/* objlen: index size, padding */
	objlen += sizeof(uint32_t) * (1 + mapstrsnum);
	objlen += mapstrslen;

	/* archive meta info, in-memory mapping */
	if (vobj->addr && (vobj->size < objlen))
		return MDSO_BUFFER_ERROR(dctx);

	if ((addr = vobj->addr)) {
		(void)0;

	} else {
		vobj->size       = objlen;
		vobj->mapstrslen = mapstrslen;
		vobj->mapstrsnum = mapstrsnum;

		if (!vobj->name)
			return 0;

		else if (mdso_create_archive(dctx,vobj) < 0)
			return MDSO_NESTED_ERROR(dctx);
	}

	ar = (unsigned char *)vobj->addr;

	/* archive signature */
	memcpy(ar,"!<arch>\n",8);
	mark = &ar[8];

	/* archive header */
	arhdr  = (struct pe_raw_archive_common_hdr *)mark;
	hdrlen = sizeof(uint32_t) * (1 + mapstrsnum) + mapstrslen;
	mdso_argen_common_hdr(arhdr,"",hdrlen);
	mark += sizeof(*arhdr);

	/* archive index initialization */
	mdso_write_big_endian_long(mark,mapstrsnum);
	mark += sizeof(uint32_t);

	idx   = mark;
	mark += sizeof(uint32_t) * mapstrsnum;

	mapstrs = (char *)mark;
	mark   += mapstrslen;

	/* .dsometa object */
	aobj->mapstrs  = mapstrs;
	aobj->arhdrpos = (uint32_t)(mark - ar);
	aobj->arhdrlen = sizeof(struct pe_raw_archive_common_hdr);
	aobj->addr     = &mark[aobj->arhdrlen];

	for (symidx=0; symidx<aobj->mapstrsnum; symidx++) {
		mdso_write_big_endian_long(idx,aobj->arhdrpos);
		idx += sizeof(uint32_t);
	}

	ret = mdso_objgen_dsometa(dctx,aobj);

	mdso_argen_common_hdr(
		(struct pe_raw_archive_common_hdr *)mark,
		".dsometa.o",aobj->size);

	mark    += aobj->arhdrlen + aobj->size;
	mapstrs += aobj->mapstrslen;

	/* archive symentry objects */
	for (psym=symv,pobj=&aobj[1]; *psym && !ret; psym++) {
		/* symentry object */
		pobj->mapstrs  = mapstrs;
		pobj->arhdrpos = (uint32_t)(mark - ar);
		pobj->arhdrlen = sizeof(struct pe_raw_archive_common_hdr);
		pobj->addr     = &mark[pobj->arhdrlen];

		for (symidx=0; symidx<pobj->mapstrsnum; symidx++) {
			mdso_write_big_endian_long(idx,pobj->arhdrpos);
			idx += sizeof(uint32_t);
		}

		mdso_obj_write_objname(objname,psym - symv);

		ret = mdso_objgen_symentry(dctx,*psym,pobj);

		mdso_argen_common_hdr(
			(struct pe_raw_archive_common_hdr *)mark,
			objname,pobj->size);

		mark    += pobj->arhdrlen + pobj->size;
		mapstrs += pobj->mapstrslen;
		pobj++;
	}

	/* aobj */
	if (aobj != sobj)
		free(aobj);

	/* fs object unmap */
	if (!addr)
		munmap(vobj->addr,vobj->size);

	/* verify */
	if (ret)
		return MDSO_NESTED_ERROR(dctx);

	/* tada */
	return 0;

}