/*

 * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

 * Copyright (C) 2008  Red Hat, Inc

 * Copyright (C) 2009  J. Ali Harlow <ali@juiblex.co.uk>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include "config.h"

#include <stdio.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <sys/stat.h>

#include <sys/types.h>

#if HAVE_SYS_WAIT_H

#include <sys/wait.h>

#endif

#include <fcntl.h>

#include <dirent.h>

#include <unistd.h>

#if MSWIN_API

#include <winsock2.h>	/* For ntohl() */

#else

#include <arpa/inet.h>

#endif

#include <limits.h>

#include <zlib.h>

#include <assert.h>

#include "razor.h"

#include "razor-internal.h"

#ifndef O_BINARY

#define O_BINARY	0

#endif

#define	RPM_LEAD_SIZE 96

enum {

    PIPE	=  1,	/*!< pipe/fifo */

    CDEV	=  2,	/*!< character device */

    XDIR	=  4,	/*!< directory */

    BDEV	=  6,	/*!< block device */

    REG		=  8,	/*!< regular file */

    LINK	= 10,	/*!< hard link */

    SOCK	= 12	/*!< socket */

};

enum {

    RPMSENSE_LESS		= 1 << 1,

    RPMSENSE_GREATER		= 1 << 2,

    RPMSENSE_EQUAL		= 1 << 3,

    RPMSENSE_PREREQ		= 1 << 6,

    RPMSENSE_SCRIPT_PRE		= 1 << 9,

    RPMSENSE_SCRIPT_POST	= 1 << 10,

    RPMSENSE_SCRIPT_PREUN	= 1 << 11,

    RPMSENSE_SCRIPT_POSTUN	= 1 << 12,

};

enum {

    RPMTAG_NAME  		= 1000,	/* s */

    RPMTAG_VERSION		= 1001,	/* s */

    RPMTAG_RELEASE		= 1002,	/* s */

    RPMTAG_EPOCH   		= 1003,	/* i */

    RPMTAG_SUMMARY		= 1004,	/* s{} */

    RPMTAG_DESCRIPTION		= 1005,	/* s{} */

    RPMTAG_BUILDTIME		= 1006,	/* i */

    RPMTAG_BUILDHOST		= 1007,	/* s */

    RPMTAG_INSTALLTIME		= 1008,	/* i */

    RPMTAG_SIZE			= 1009,	/* i */

    RPMTAG_DISTRIBUTION		= 1010,	/* s */

    RPMTAG_VENDOR		= 1011,	/* s */

    RPMTAG_GIF			= 1012,	/* x */

    RPMTAG_XPM			= 1013,	/* x */

    RPMTAG_LICENSE		= 1014,	/* s */

    RPMTAG_PACKAGER		= 1015,	/* s */

    RPMTAG_GROUP		= 1016,	/* s{} */

    RPMTAG_CHANGELOG		= 1017, /*!< s[] internal */

    RPMTAG_SOURCE		= 1018,	/* s[] */

    RPMTAG_PATCH		= 1019,	/* s[] */

    RPMTAG_URL			= 1020,	/* s */

    RPMTAG_OS			= 1021,	/* s legacy used int */

    RPMTAG_ARCH			= 1022,	/* s legacy used int */

    RPMTAG_PREIN		= 1023,	/* s */

    RPMTAG_POSTIN		= 1024,	/* s */

    RPMTAG_PREUN		= 1025,	/* s */

    RPMTAG_POSTUN		= 1026,	/* s */

    RPMTAG_OLDFILENAMES		= 1027, /* s[] obsolete */

    RPMTAG_FILESIZES		= 1028,	/* i */

    RPMTAG_FILESTATES		= 1029, /* c */

    RPMTAG_FILEMODES		= 1030,	/* h */

    RPMTAG_FILEUIDS		= 1031, /*!< internal */

    RPMTAG_FILEGIDS		= 1032, /*!< internal */

    RPMTAG_FILERDEVS		= 1033,	/* h */

    RPMTAG_FILEMTIMES		= 1034, /* i */

    RPMTAG_FILEMD5S		= 1035,	/* s[] */

    RPMTAG_FILELINKTOS		= 1036,	/* s[] */

    RPMTAG_FILEFLAGS		= 1037,	/* i */

    RPMTAG_ROOT			= 1038, /*!< internal - obsolete */

    RPMTAG_FILEUSERNAME		= 1039,	/* s[] */

    RPMTAG_FILEGROUPNAME	= 1040,	/* s[] */

    RPMTAG_EXCLUDE		= 1041, /*!< internal - obsolete */

    RPMTAG_EXCLUSIVE		= 1042, /*!< internal - obsolete */

    RPMTAG_ICON			= 1043,

    RPMTAG_SOURCERPM		= 1044,	/* s */

    RPMTAG_FILEVERIFYFLAGS	= 1045,	/* i */

    RPMTAG_ARCHIVESIZE		= 1046,	/* i */

    RPMTAG_PROVIDENAME		= 1047,	/* s[] */

    RPMTAG_REQUIREFLAGS		= 1048,	/* i */

    RPMTAG_REQUIRENAME		= 1049,	/* s[] */

    RPMTAG_REQUIREVERSION	= 1050,	/* s[] */

    RPMTAG_NOSOURCE		= 1051, /*!< internal */

    RPMTAG_NOPATCH		= 1052, /*!< internal */

    RPMTAG_CONFLICTFLAGS	= 1053, /* i */

    RPMTAG_CONFLICTNAME		= 1054,	/* s[] */

    RPMTAG_CONFLICTVERSION	= 1055,	/* s[] */

    RPMTAG_DEFAULTPREFIX	= 1056, /*!< internal - deprecated */

    RPMTAG_BUILDROOT		= 1057, /*!< internal */

    RPMTAG_INSTALLPREFIX	= 1058, /*!< internal - deprecated */

    RPMTAG_EXCLUDEARCH		= 1059,

    RPMTAG_EXCLUDEOS		= 1060,

    RPMTAG_EXCLUSIVEARCH	= 1061,

    RPMTAG_EXCLUSIVEOS		= 1062,

    RPMTAG_AUTOREQPROV		= 1063, /*!< internal */

    RPMTAG_RPMVERSION		= 1064,	/* s */

    RPMTAG_TRIGGERSCRIPTS	= 1065,	/* s[] */

    RPMTAG_TRIGGERNAME		= 1066,	/* s[] */

    RPMTAG_TRIGGERVERSION	= 1067,	/* s[] */

    RPMTAG_TRIGGERFLAGS		= 1068,	/* i */

    RPMTAG_TRIGGERINDEX		= 1069,	/* i */

    RPMTAG_VERIFYSCRIPT		= 1079,	/* s */

    RPMTAG_CHANGELOGTIME	= 1080,	/* i */

    RPMTAG_CHANGELOGNAME	= 1081,	/* s[] */

    RPMTAG_CHANGELOGTEXT	= 1082,	/* s[] */

    RPMTAG_BROKENMD5		= 1083, /*!< internal - obsolete */

    RPMTAG_PREREQ		= 1084, /*!< internal */

    RPMTAG_PREINPROG		= 1085,	/* s */

    RPMTAG_POSTINPROG		= 1086,	/* s */

    RPMTAG_PREUNPROG		= 1087,	/* s */

    RPMTAG_POSTUNPROG		= 1088,	/* s */

    RPMTAG_BUILDARCHS		= 1089,

    RPMTAG_OBSOLETENAME		= 1090,	/* s[] */

    RPMTAG_VERIFYSCRIPTPROG	= 1091,	/* s */

    RPMTAG_TRIGGERSCRIPTPROG	= 1092,	/* s */

    RPMTAG_DOCDIR		= 1093, /*!< internal */

    RPMTAG_COOKIE		= 1094,	/* s */

    RPMTAG_FILEDEVICES		= 1095,	/* i */

    RPMTAG_FILEINODES		= 1096,	/* i */

    RPMTAG_FILELANGS		= 1097,	/* s[] */

    RPMTAG_PREFIXES		= 1098,	/* s[] */

    RPMTAG_INSTPREFIXES		= 1099,	/* s[] */

    RPMTAG_TRIGGERIN		= 1100, /*!< internal */

    RPMTAG_TRIGGERUN		= 1101, /*!< internal */

    RPMTAG_TRIGGERPOSTUN	= 1102, /*!< internal */

    RPMTAG_AUTOREQ		= 1103, /*!< internal */

    RPMTAG_AUTOPROV		= 1104, /*!< internal */

    RPMTAG_CAPABILITY		= 1105, /*!< internal - obsolete */

    RPMTAG_SOURCEPACKAGE	= 1106, /*!< i src.rpm header marker */

    RPMTAG_OLDORIGFILENAMES	= 1107, /*!< internal - obsolete */

    RPMTAG_BUILDPREREQ		= 1108, /*!< internal */

    RPMTAG_BUILDREQUIRES	= 1109, /*!< internal */

    RPMTAG_BUILDCONFLICTS	= 1110, /*!< internal */

    RPMTAG_BUILDMACROS		= 1111, /*!< internal - unused */

    RPMTAG_PROVIDEFLAGS		= 1112,	/* i */

    RPMTAG_PROVIDEVERSION	= 1113,	/* s[] */

    RPMTAG_OBSOLETEFLAGS	= 1114,	/* i */

    RPMTAG_OBSOLETEVERSION	= 1115,	/* s[] */

    RPMTAG_DIRINDEXES		= 1116,	/* i */

    RPMTAG_BASENAMES		= 1117,	/* s[] */

    RPMTAG_DIRNAMES		= 1118,	/* s[] */

    RPMTAG_ORIGDIRINDEXES	= 1119, /*!< internal */

    RPMTAG_ORIGBASENAMES	= 1120, /*!< internal */

    RPMTAG_ORIGDIRNAMES		= 1121, /*!< internal */

    RPMTAG_OPTFLAGS		= 1122,	/* s */

    RPMTAG_DISTURL		= 1123,	/* s */

    RPMTAG_PAYLOADFORMAT	= 1124,	/* s */

    RPMTAG_PAYLOADCOMPRESSOR	= 1125,	/* s */

    RPMTAG_PAYLOADFLAGS		= 1126,	/* s */

    RPMTAG_INSTALLCOLOR		= 1127, /*!< i transaction color when installed */

    RPMTAG_INSTALLTID		= 1128,	/* i */

    RPMTAG_REMOVETID		= 1129,	/* i */

    RPMTAG_SHA1RHN		= 1130, /*!< internal - obsolete */

    RPMTAG_RHNPLATFORM		= 1131,	/* s */

    RPMTAG_PLATFORM		= 1132,	/* s */

    RPMTAG_PATCHESNAME		= 1133, /*!< placeholder (SuSE) */

    RPMTAG_PATCHESFLAGS		= 1134, /*!< placeholder (SuSE) */

    RPMTAG_PATCHESVERSION	= 1135, /*!< placeholder (SuSE) */

    RPMTAG_CACHECTIME		= 1136,	/* i */

    RPMTAG_CACHEPKGPATH		= 1137,	/* s */

    RPMTAG_CACHEPKGSIZE		= 1138,	/* i */

    RPMTAG_CACHEPKGMTIME	= 1139,	/* i */

    RPMTAG_FILECOLORS		= 1140,	/* i */

    RPMTAG_FILECLASS		= 1141,	/* i */

    RPMTAG_CLASSDICT		= 1142,	/* s[] */

    RPMTAG_FILEDEPENDSX		= 1143,	/* i */

    RPMTAG_FILEDEPENDSN		= 1144,	/* i */

    RPMTAG_DEPENDSDICT		= 1145,	/* i */

    RPMTAG_SOURCEPKGID		= 1146,	/* x */

    RPMTAG_FILECONTEXTS		= 1147,	/* s[] */

    RPMTAG_FSCONTEXTS		= 1148,	/*!< s[] extension */

    RPMTAG_RECONTEXTS		= 1149,	/*!< s[] extension */

    RPMTAG_POLICIES		= 1150,	/*!< s[] selinux *.te policy file. */

    RPMTAG_PRETRANS		= 1151,	/* s */

    RPMTAG_POSTTRANS		= 1152,	/* s */

    RPMTAG_PRETRANSPROG		= 1153,	/* s */

    RPMTAG_POSTTRANSPROG	= 1154,	/* s */

    RPMTAG_DISTTAG		= 1155,	/* s */

    RPMTAG_SUGGESTSNAME		= 1156,	/* s[] extension placeholder */

    RPMTAG_SUGGESTSVERSION	= 1157,	/* s[] extension placeholder */

    RPMTAG_SUGGESTSFLAGS	= 1158,	/* i   extension placeholder */

    RPMTAG_ENHANCESNAME		= 1159,	/* s[] extension placeholder */

    RPMTAG_ENHANCESVERSION	= 1160,	/* s[] extension placeholder */

    RPMTAG_ENHANCESFLAGS	= 1161,	/* i   extension placeholder */

    RPMTAG_PRIORITY		= 1162, /* i   extension placeholder */

    RPMTAG_CVSID		= 1163, /* s */

    RPMTAG_TRIGGERPREIN		= 1171, /*!< internal */

};

struct rpm_header {

	unsigned char magic[4];

	unsigned char reserved[4];

	int nindex;

	int hsize;

};

struct rpm_header_index {

	int tag;

	int type;

	int offset;

	int count;

};

struct razor_rpm {

	struct rpm_header *signature;

	struct rpm_header *header;

	const char **dirs;

	unsigned int n_prefixes;

	const char **prefixes;

	const char *pool;

	void *map;

	size_t size;

	void *payload;

	struct razor_relocations *relocations;

};

enum razor_relocation_flags {

	RAZOR_RELOCATION_ACTIVE		= 1 << 0,

};

struct razor_relocation {

	enum razor_relocation_flags flags;

	size_t oldlen;

	size_t newlen;

	char *oldpath;

	char *newpath;

};

struct razor_relocations {

	/* Ordered such that if oldpath 1 starts with oldpath 2, then

	 * oldpath 1 is listed first (ie., /usr/bin comes before /usr)

	 * and terminated with a NULL oldpath.

	 */

	struct razor_relocation *relocations;

	int n_relocations;

	char *path;

};

RAZOR_EXPORT struct razor_relocations *razor_relocations_create(void)

{

	return calloc(1, sizeof(struct razor_relocations));

}

RAZOR_EXPORT void razor_relocations_add(struct razor_relocations *rr,

			   const char *oldpath, const char *newpath)

{

	int i, found = 0;

	size_t len;

	if (newpath && !strcmp(oldpath, newpath))

		newpath = NULL;

	for (i = 0; i < rr->n_relocations; i++) {

		len = rr->relocations[i].oldlen;

		if (!strncmp(rr->relocations[i].oldpath, oldpath, len)) {

			found = !strcmp(rr->relocations[i].oldpath, oldpath);

			break;

		}

	}

	if (!newpath) {

		if (found) {

			free(rr->relocations[i].oldpath);

			free(rr->relocations[i].newpath);

			do {

				rr->relocations[i] = rr->relocations[i + 1];

			} while (rr->relocations[++i].oldpath);

		}

		return;

	}

	if (found) {

		free(rr->relocations[i].newpath);

		rr->relocations[i].newpath = strdup(newpath);

		rr->relocations[i].newlen = strlen(newpath);

		return;

	}

	if (!rr->n_relocations++)

		rr->relocations = calloc(1, sizeof *rr->relocations);

	else {

		rr->relocations = realloc(rr->relocations,

					  rr->n_relocations * sizeof *rr->relocations);

		memmove(rr->relocations + i + 1, rr->relocations + i,

			(rr->n_relocations - i - 1) * sizeof *rr->relocations);

	}

	rr->relocations[i].flags = 0;

	rr->relocations[i].oldpath = strdup(oldpath);

	rr->relocations[i].newpath = strdup(newpath);

	rr->relocations[i].oldlen = strlen(oldpath);

	rr->relocations[i].newlen = strlen(newpath);

}

RAZOR_EXPORT void

razor_relocations_set_rpm(struct razor_relocations *rr, struct razor_rpm *rpm)

{

	int i, j;

	for (i = 0; i < rr->n_relocations; i++) {

		rr->relocations[i].flags &= ~RAZOR_RELOCATION_ACTIVE;

		for (j = 0; j < rpm->n_prefixes; j++)

			if (!strcmp(rpm->prefixes[j],

				    rr->relocations[i].oldpath)) {

				rr->relocations[i].flags |= RAZOR_RELOCATION_ACTIVE;

				break;

			}

	}

}

RAZOR_EXPORT const char *

razor_relocations_apply(struct razor_relocations *rr, const char *path)

{

	int i;

	size_t len;

	for (i = 0; i < rr->n_relocations; i++)

		if (rr->relocations[i].flags & RAZOR_RELOCATION_ACTIVE &&

		    !strncmp(path, rr->relocations[i].oldpath,

			     rr->relocations[i].oldlen))

			break;

	if (i < rr->n_relocations) {

		free(rr->path);

		len = strlen(path + rr->relocations[i].oldlen) +

		      rr->relocations[i].newlen;

		rr->path = malloc(len + 1);

		memcpy(rr->path, rr->relocations[i].newpath,

		       rr->relocations[i].newlen);

		strcpy(rr->path + rr->relocations[i].newlen,

		       path + rr->relocations[i].oldlen);

		return rr->path;

	} else

		return path;

}

RAZOR_EXPORT void razor_relocations_destroy(struct razor_relocations *rr)

{

	printf("razor_relocations_destroy(rr=%p): path=%p, rel=%p\n",

	  rr,rr->path,rr->relocations);

	free(rr->path);

	free(rr->relocations);

	free(rr);

}

static struct rpm_header_index *

razor_rpm_get_header(struct razor_rpm *rpm, unsigned int tag)

{

	struct rpm_header_index *index, *end;

	index = (struct rpm_header_index *) (rpm->header + 1);

	end = index + ntohl(rpm->header->nindex);

	while (index < end) {

		if (ntohl(index->tag) == tag)

			return index;

		index++;

	}

	return NULL;

}

static const void *

razor_rpm_get_indirect(struct razor_rpm *rpm,

		       unsigned int tag, unsigned int *count)

{

	struct rpm_header_index *index;

	index = razor_rpm_get_header(rpm, tag);

	if (index != NULL) {

		if (count)

			*count = ntohl(index->count);

		return rpm->pool + ntohl(index->offset);

	}

	return NULL;

}

static uint32_t

rpm_to_razor_flags(uint32_t flags)

{

	uint32_t razor_flags;

	razor_flags = 0;

	if (flags & RPMSENSE_LESS)

		razor_flags |= RAZOR_PROPERTY_LESS;

	if (flags & RPMSENSE_EQUAL)

		razor_flags |= RAZOR_PROPERTY_EQUAL;

	if (flags & RPMSENSE_GREATER)

		razor_flags |= RAZOR_PROPERTY_GREATER;

	if (flags & RPMSENSE_SCRIPT_PRE)

		razor_flags |= RAZOR_PROPERTY_PRE;

	if (flags & RPMSENSE_SCRIPT_POST)

		razor_flags |= RAZOR_PROPERTY_POST;

	if (flags & RPMSENSE_SCRIPT_PREUN)

		razor_flags |= RAZOR_PROPERTY_PREUN;

	if (flags & RPMSENSE_SCRIPT_POSTUN)

		razor_flags |= RAZOR_PROPERTY_POSTUN;

	return razor_flags;

}

static void

import_properties(struct razor_importer *importer, uint32_t type,

		  struct razor_rpm *rpm,

		  int name_tag, int version_tag, int flags_tag)

{

	const char *name, *version;

	const uint32_t *flags;

	uint32_t f;

	unsigned int i, count;

	name = razor_rpm_get_indirect(rpm, name_tag, &count);

	if (name == NULL)

		return;

	flags = razor_rpm_get_indirect(rpm, flags_tag, &count);

	version = razor_rpm_get_indirect(rpm, version_tag, &count);

	for (i = 0; i < count; i++) {

		f = rpm_to_razor_flags(ntohl(flags[i]));

		razor_importer_add_property(importer, name, f | type, version);

		name += strlen(name) + 1;

		version += strlen(version) + 1;

	}

}

static void

import_files(struct razor_importer *importer, struct razor_rpm *rpm)

{

	const char *name;

	const uint32_t *index;

	unsigned int i, count;

	char buffer[256];

	if (rpm->dirs == NULL)

		return;

	/* assert: count is the same for all arrays */

	index = razor_rpm_get_indirect(rpm, RPMTAG_DIRINDEXES, &count);

	name = razor_rpm_get_indirect(rpm, RPMTAG_BASENAMES, &count);

	for (i = 0; i < count; i++) {

		snprintf(buffer, sizeof buffer,

			 "%s%s", rpm->dirs[ntohl(*index)], name);

		razor_importer_add_file(importer, buffer);

		name += strlen(name) + 1;

		index++;

	}

}

RAZOR_EXPORT struct razor_rpm *

razor_rpm_open(const char *filename)

{

	struct razor_rpm *rpm;

	struct rpm_header_index *base, *index;

	unsigned int count, i, nindex, hsize;

	const char *name, *prefix;

	assert (filename != NULL);

	rpm = malloc(sizeof *rpm);

	if (rpm == NULL)

		return NULL;

	memset(rpm, 0, sizeof *rpm);

	rpm->map = razor_file_get_contents(filename, &rpm->size);

	if (!rpm->map) {

		fprintf(stderr, "couldn't get contents of %s (%s)\n", filename,

			strerror(errno));

		return NULL;

	}

	rpm->signature = rpm->map + RPM_LEAD_SIZE;

	nindex = ntohl(rpm->signature->nindex);

	hsize = ntohl(rpm->signature->hsize);

	rpm->header = (void *) (rpm->signature + 1) +

		ALIGN(nindex * sizeof *index + hsize, 8);

	nindex = ntohl(rpm->header->nindex);

	hsize = ntohl(rpm->header->hsize);

	rpm->payload = (void *) (rpm->header + 1) +

		nindex * sizeof *index + hsize;

	base = (struct rpm_header_index *) (rpm->header + 1);

	rpm->pool = (void *) base + nindex * sizeof *index;

	/* Look up dir names now so we can index them directly. */

	name = razor_rpm_get_indirect(rpm, RPMTAG_DIRNAMES, &count);

	if (name) {

		rpm->dirs = calloc(count, sizeof *rpm->dirs);

		for (i = 0; i < count; i++) {

			rpm->dirs[i] = name;

			name += strlen(name) + 1;

		}

	} else {

		name = razor_rpm_get_indirect(rpm, RPMTAG_OLDFILENAMES,

					      &count);

		if (name) {

			fprintf(stderr, "old filenames not supported\n");

			return NULL;

		}

	}

	prefix = razor_rpm_get_indirect(rpm, RPMTAG_PREFIXES, &count);

	if (prefix) {

		rpm->prefixes = calloc(count, sizeof *rpm->prefixes);

		for (i = 0; i < count; i++) {

			rpm->prefixes[i] = prefix;

			prefix += strlen(prefix) + 1;

		}

		rpm->n_prefixes = count;

	} else {

		prefix = razor_rpm_get_indirect(rpm, RPMTAG_DEFAULTPREFIX,

						&count);

		if (prefix) {

			fprintf(stderr, "default prefix not supported\n");

			return NULL;

		}

	}

	return rpm;

}

RAZOR_EXPORT void razor_rpm_set_relocations(struct razor_rpm *rpm,

					    struct razor_relocations *rr)

{

	assert (rpm != NULL);

	rpm->relocations = rr;

}

struct cpio_file_header {

	char magic[6];

	char inode[8];

	char mode[8];

	char uid[8];

	char gid[8];

	char nlink[8];

	char mtime[8];

	char filesize[8];

	char devmajor[8];

	char devminor[8];

	char rdevmajor[8];

	char rdevminor[8];

	char namesize[8];

	char checksum[8];

	char filename[0];

};

/* gzip flags */

#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */

#define HEAD_CRC     0x02 /* bit 1 set: header CRC present */

#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */

#define ORIG_NAME    0x08 /* bit 3 set: original file name present */

#define COMMENT      0x10 /* bit 4 set: file comment present */

#define RESERVED     0xE0 /* bits 5..7: reserved */

struct installer {

	const char *root;

	struct razor_rpm *rpm;

	z_stream stream;

	unsigned char buffer[32768];

	size_t rest, length;

};

static int

installer_inflate(struct installer *installer)

{

	size_t length;

	int err;

	if (installer->rest > sizeof installer->buffer)

		length = sizeof installer->buffer;

	else

		length = installer->rest;

	installer->stream.next_out = installer->buffer;

	installer->stream.avail_out = length;

	err = inflate(&installer->stream, Z_SYNC_FLUSH);

	if (err != Z_OK && err != Z_STREAM_END) {

		fprintf(stderr, "inflate error: %d (%s)\n", err,

			strerror(errno));

		return -1;

	}

	installer->rest -= length;

	installer->length = length;

	return 0;

}

static int

installer_align(struct installer *installer, size_t size)

{

	unsigned char buffer[4];

	int err;

	installer->stream.next_out = buffer;

	installer->stream.avail_out =

		(size - installer->stream.total_out) & (size - 1);

	if (installer->stream.avail_out == 0)

		return 0;

	err = inflate(&installer->stream, Z_SYNC_FLUSH);

	if (err != Z_OK && err != Z_STREAM_END) {

		fprintf(stderr, "inflate error: %d (%s)\n", err,

			strerror(errno));

		return -1;

	}

	return 0;

}

static int

create_path(struct installer *installer, const char *path, unsigned int mode)

{

	char buffer[PATH_MAX];

	struct stat buf;

	int fd, ret;

	if (razor_create_dir(installer->root, path) < 0)

		return -1;

	snprintf(buffer, sizeof buffer, "%s%s", installer->root, path);

	switch (mode >> 12) {

	case REG:

		/* FIXME: handle the case where a file is already there. */

		fd = open(buffer, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,

			  mode & 0x1ff);

		if (fd < 0){

			fprintf(stderr, "failed to create file %s\n", buffer);

			return -1;

		}

		while (installer->rest > 0) {

			if (installer_inflate(installer)) {

				fprintf(stderr, "failed to inflate\n");

				return -1;

			}

			if (razor_write(fd, installer->buffer,

					installer->length)) {

				fprintf(stderr, "failed to write payload\n");

				return -1;

			}

		}

		if (close(fd) < 0) {

			fprintf(stderr, "failed to close %s: %s\n", buffer,

				strerror(errno));

			return -1;

		}

		return 0;

	case XDIR:

		ret = mkdir(buffer, mode & 0x1ff);

		if (ret == 0 || errno != EEXIST)

			return ret;

		if (stat(buffer, &buf) || !S_ISDIR(buf.st_mode)) {

			/* FIXME: also check that mode match. */

			fprintf(stderr,

				"%s exists but is not a directory\n", buffer);

			return -1;

		}

		return 0;

	case LINK:

#if HAVE_SYMLINK

		if (installer_inflate(installer)) {

			fprintf(stderr, "failed to inflate\n");

			return -1;

		}

		if (installer->length >= sizeof installer->buffer) {

			fprintf(stderr, "link name too long\n");

			return -1;

		}

		installer->buffer[installer->length] = '\0';

		if (symlink((const char *) installer->buffer, buffer)) {

			perror("failed to create symlink");

			return -1;

		}

		return 0;

#else

		/* fall through */

#endif

	case PIPE:

	case CDEV:

	case BDEV:

	case SOCK:

		printf("%s: unhandled file type %d\n", buffer, mode >> 12);

		return 0;

	default:

		printf("%s: unknown file type %d\n", buffer, mode >> 12);

		return 0;

	}

}

static int chroot_push(const char *root)

{

	int fd;

#if HAVE_CHROOT

	if (geteuid() == 0) {

		fd = open("/", O_RDONLY, 0);

		if (chroot(root) < 0) {

			fprintf(stderr, "failed to chroot to %s: %s\n",

				root, strerror(errno));

			exit(-1);

		}

	} else

#endif

		fd = -1;

	return fd;

}

static void chroot_pop(int fd)

{

#if HAVE_CHROOT

	if (fd >= 0) {

		fchdir(fd);

		close(fd);

		chroot(".");

	}

#endif

}

static int

run_script_lua(const char *root, unsigned int script_tag, const char *script)

{

	int root_fd, retval;

#if HAVE_LUA

	const char *name;

	switch(script_tag) {

		case RPMTAG_PREIN:

			name = "%pre";

			break;

		case RPMTAG_POSTIN:

			name = "%post";

			break;

		case RPMTAG_PREUN:

			name = "%preun";

			break;

		case RPMTAG_POSTUN:

			name = "%postun";

			break;

		default:

			name = "script";

			break;

	}

	root_fd = chroot_push(root);

	retval = run_lua_script(root_fd < 0 ? root : NULL, name, script, -1);

	chroot_pop(root_fd);

#else	/* HAVE_LUA */

	fprintf(stderr, "lua not available to run script\n");

	retval = -1;

#endif	/* HAVE_LUA */

	return retval;

}

static int

run_script_external(const char *root, const char *program, const char *script)

{

	int root_fd, retval;

	FILE *fp;

	if (program == NULL) {

#if MSWIN_API

		program = getenv("COMSPEC");

		if (program) {

			program = strchr(program, '=');

			if (program)

				program++;

		}

		if (!program)

			program = "c:\\windows\\system32\\cmd.exe";

#else

		program = "/bin/sh";

#endif

	}

	root_fd = chroot_push(root);

	fp = popen(program, "w");

	if (!fp) {

		perror(program);

		retval = -1;

	} else if (fwrite(script, strlen(script), 1, fp) != 1) {

		perror("failed to write script to program");

		retval = -1;

	} else

		retval = 0;

	if (fp)

		pclose(fp);

	chroot_pop(root_fd);

	return retval;

}

static int

run_script(struct installer *installer,

	   unsigned int program_tag, unsigned int script_tag)

{

	int retval;

	const char *script = NULL, *program = NULL;

	program = razor_rpm_get_indirect(installer->rpm, program_tag, NULL);

	script = razor_rpm_get_indirect(installer->rpm, script_tag, NULL);

	if (program == NULL && script == NULL)

		retval = 0;

	else if (strcmp(program, "<lua>") == 0)

		retval = run_script_lua(installer->root, script_tag, script);

	else

		retval = run_script_external(installer->root, program, script);

	return retval;

}

static int

installer_init(struct installer *installer)

{

	unsigned char *gz_header;

	int method, flags, err;

	gz_header = installer->rpm->payload;

	if (gz_header[0] != 0x1f || gz_header[1] != 0x8b) {

		fprintf(stderr, "payload section doesn't have gz header\n");

		return -1;

	}

	method = gz_header[2];

	flags = gz_header[3];

	if (method != Z_DEFLATED || flags != 0) {

		fprintf(stderr,

			"unknown payload compression method or flags set\n");

		return -1;

	}

	installer->stream.zalloc = NULL;

	installer->stream.zfree = NULL;

	installer->stream.opaque = NULL;

	installer->stream.next_in  = gz_header + 10;

	installer->stream.avail_in =

		(installer->rpm->map + installer->rpm->size) -

		(void *) installer->stream.next_in;

	installer->stream.next_out = NULL;

	installer->stream.avail_out = 0;

	err = inflateInit2(&installer->stream, -MAX_WBITS);

	if (err != Z_OK) {

		fprintf(stderr, "inflateInit error: %d\n", err);

		return -1;

	}

	return 0;

}

static int

installer_finish(struct installer *installer)

{

	int err;

	err = inflateEnd(&installer->stream);

	if (err != Z_OK) {

		fprintf(stderr, "inflateEnd error: %d\n", err);

		return -1;

	}

	return 0;

}

static unsigned long

fixed_hex_to_ulong(const char *hex, int length)

{

	long l;

	int i;

	for (i = 0, l = 0; i < length; i++) {

		if (hex[i] < 'a')

			l = l * 16 + hex[i] - '0';

		else

			l = l * 16 + hex[i] - 'a' + 10;

	}

	return l;

}

RAZOR_EXPORT int

razor_rpm_install(struct razor_rpm *rpm, const char *root)

{

	struct installer installer;

	struct cpio_file_header *header;

	struct stat buf;

	unsigned int mode;

	const char *path;

	size_t filesize;

	assert (rpm != NULL);

	assert (root != NULL);

	installer.rpm = rpm;

	installer.root = root;

	/* FIXME: Only do this before a transaction, not per rpm. */

	if (*root && (stat(root, &buf) < 0 || !S_ISDIR(buf.st_mode))) {

		fprintf(stderr,

			"root installation directory \"%s\" does not exist\n",

			root);

		return -1;

	}

	if (rpm->relocations)

		razor_relocations_set_rpm(rpm->relocations, rpm);

	if (installer_init(&installer))

		return -1;

	run_script(&installer, RPMTAG_PREINPROG, RPMTAG_PREIN);

	while (installer.stream.avail_in > 0) {

		installer.rest = sizeof *header;

		if (installer_inflate(&installer))

			return -1;

		header = (struct cpio_file_header *) installer.buffer;

		mode = fixed_hex_to_ulong(header->mode, sizeof header->mode);

		filesize = fixed_hex_to_ulong(header->filesize,

					      sizeof header->filesize);

		installer.rest = fixed_hex_to_ulong(header->namesize,

						    sizeof header->namesize);

		if (installer_inflate(&installer) ||

		    installer_align(&installer, 4))

			return -1;

		path = (const char *) installer.buffer;

		/* This convention is so lame... */

		if (strcmp(path, "TRAILER!!!") == 0)

			break;

		installer.rest = filesize;

		path++;

		if (rpm->relocations)

			path = razor_relocations_apply(rpm->relocations, path);

		if (create_path(&installer, path, mode) < 0)

			return -1;

		if (installer_align(&installer, 4))

			return -1;