libselinux/utils/sefcontext_compile.c - manifest_repos/selinux - Git at Google

 #include <ctype.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <getopt.h>
 #include <limits.h>
 #include <selinux/selinux.h>
 #include <sepol/sepol.h>

 #include "../src/label_file.h"
 #include "../src/regex.h"

 const char *policy_file;
 static int ctx_err;

 static int validate_context(char **ctxp)
 {
 	char *ctx = *ctxp;

 	if (policy_file && sepol_check_context(ctx) < 0) {
 		ctx_err = -1;
 		return ctx_err;
 	}

 	return 0;
 }

 static int process_file(struct selabel_handle *rec, const char *filename)
 {
 	unsigned int line_num;
 	int rc;
 	char *line_buf = NULL;
 	size_t line_len = 0;
 	FILE *context_file;
 	const char *prefix = NULL;

 	context_file = fopen(filename, "r");
 	if (!context_file) {
 		fprintf(stderr, "Error opening %s: %s\n",
 			    filename, strerror(errno));
 		return -1;
 	}

 	line_num = 0;
 	rc = 0;
 	while (getline(&line_buf, &line_len, context_file) > 0) {
 		rc = process_line(rec, filename, prefix, line_buf, ++line_num);
 		if (rc || ctx_err) {
 			/* With -p option need to check and fail if ctx err as
 			 * process_line() context validation on Linux does not
 			 * return an error, but does print the error line to
 			 * stderr. Android will set both to error and print
 			 * the error line. */
 			rc = -1;
 			goto out;
 		}
 	}
 out:
 	free(line_buf);
 	fclose(context_file);
 	return rc;
 }

 /*
  * File Format
  *
  * u32 - magic number
  * u32 - version
  * u32 - length of pcre version EXCLUDING nul
  * char - pcre version string EXCLUDING nul
  * u32 - number of stems
  * ** Stems
  *	u32  - length of stem EXCLUDING nul
  *	char - stem char array INCLUDING nul
  * u32 - number of regexs
  * ** Regexes
  *	u32  - length of upcoming context INCLUDING nul
  *	char - char array of the raw context
  *	u32  - length of the upcoming regex_str
  *	char - char array of the original regex string including the stem.
  *	u32  - mode bits for >= SELINUX_COMPILED_FCONTEXT_MODE
  *	       mode_t for <= SELINUX_COMPILED_FCONTEXT_PCRE_VERS
  *	s32  - stemid associated with the regex
  *	u32  - spec has meta characters
  *	u32  - The specs prefix_len if >= SELINUX_COMPILED_FCONTEXT_PREFIX_LEN
  *	u32  - data length of the pcre regex
  *	char - a buffer holding the raw pcre regex info
  *	u32  - data length of the pcre regex study daya
  *	char - a buffer holding the raw pcre regex study data
  */
 static int write_binary_file(struct saved_data *data, int fd,
 			     int do_write_precompregex)
 {
 	struct spec *specs = data->spec_arr;
 	FILE *bin_file;
 	size_t len;
 	uint32_t magic = SELINUX_MAGIC_COMPILED_FCONTEXT;
 	uint32_t section_len;
 	uint32_t i;
 	int rc;
 	const char *reg_version;
 	const char *reg_arch;

 	bin_file = fdopen(fd, "w");
 	if (!bin_file) {
 		perror("fopen output_file");
 		exit(EXIT_FAILURE);
 	}

 	/* write some magic number */
 	len = fwrite(&magic, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;

 	/* write the version */
 	section_len = SELINUX_COMPILED_FCONTEXT_MAX_VERS;
 	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;

 	/* write version of the regex back-end */
 	reg_version = regex_version();
 	if (!reg_version)
 		goto err;
 	section_len = strlen(reg_version);
 	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;
 	len = fwrite(reg_version, sizeof(char), section_len, bin_file);
 	if (len != section_len)
 		goto err;

 	/* write regex arch string */
 	reg_arch = regex_arch_string();
 	if (!reg_arch)
 		goto err;
 	section_len = strlen(reg_arch);
 	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;
 	len = fwrite(reg_arch, sizeof(char), section_len, bin_file);
 	if (len != section_len)
 		goto err;

 	/* write the number of stems coming */
 	section_len = data->num_stems;
 	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;

 	for (i = 0; i < section_len; i++) {
 		char *stem = data->stem_arr[i].buf;
 		uint32_t stem_len = data->stem_arr[i].len;

 		/* write the strlen (aka no nul) */
 		len = fwrite(&stem_len, sizeof(uint32_t), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* include the nul in the file */
 		stem_len += 1;
 		len = fwrite(stem, sizeof(char), stem_len, bin_file);
 		if (len != stem_len)
 			goto err;
 	}

 	/* write the number of regexes coming */
 	section_len = data->nspec;
 	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
 	if (len != 1)
 		goto err;

 	for (i = 0; i < section_len; i++) {
 		char *context = specs[i].lr.ctx_raw;
 		char *regex_str = specs[i].regex_str;
 		mode_t mode = specs[i].mode;
 		size_t prefix_len = specs[i].prefix_len;
 		int32_t stem_id = specs[i].stem_id;
 		struct regex_data *re = specs[i].regex;
 		uint32_t to_write;

 		/* length of the context string (including nul) */
 		to_write = strlen(context) + 1;
 		len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* original context strin (including nul) */
 		len = fwrite(context, sizeof(char), to_write, bin_file);
 		if (len != to_write)
 			goto err;

 		/* length of the original regex string (including nul) */
 		to_write = strlen(regex_str) + 1;
 		len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* original regex string */
 		len = fwrite(regex_str, sizeof(char), to_write, bin_file);
 		if (len != to_write)
 			goto err;

 		/* binary F_MODE bits */
 		to_write = mode;
 		len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* stem for this regex (could be -1) */
 		len = fwrite(&stem_id, sizeof(stem_id), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* does this spec have a metaChar? */
 		to_write = specs[i].hasMetaChars;
 		len = fwrite(&to_write, sizeof(to_write), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* For SELINUX_COMPILED_FCONTEXT_PREFIX_LEN */
 		to_write = prefix_len;
 		len = fwrite(&to_write, sizeof(to_write), 1, bin_file);
 		if (len != 1)
 			goto err;

 		/* Write regex related data */
 		rc = regex_writef(re, bin_file, do_write_precompregex);
 		if (rc < 0)
 			goto err;
 	}

 	rc = 0;
 out:
 	fclose(bin_file);
 	return rc;
 err:
 	rc = -1;
 	goto out;
 }

 static void free_specs(struct saved_data *data)
 {
 	struct spec *specs = data->spec_arr;
 	unsigned int num_entries = data->nspec;
 	unsigned int i;

 	for (i = 0; i < num_entries; i++) {
 		free(specs[i].lr.ctx_raw);
 		free(specs[i].lr.ctx_trans);
 		free(specs[i].regex_str);
 		free(specs[i].type_str);
 		regex_data_free(specs[i].regex);
 	}
 	free(specs);

 	num_entries = data->num_stems;
 	for (i = 0; i < num_entries; i++)
 		free(data->stem_arr[i].buf);
 	free(data->stem_arr);

 	memset(data, 0, sizeof(*data));
 }

 static __attribute__ ((__noreturn__)) void usage(const char *progname)
 {
 	fprintf(stderr,
 	    "usage: %s [-o out_file] [-p policy_file] fc_file\n"
 	    "Where:\n\t"
 	    "-o       Optional file name of the PCRE formatted binary\n\t"
 	    "         file to be output. If not specified the default\n\t"
 	    "         will be fc_file with the .bin suffix appended.\n\t"
 	    "-p       Optional binary policy file that will be used to\n\t"
 	    "         validate contexts defined in the fc_file.\n\t"
 	    "-r       Omit precompiled regular expressions from the output.\n\t"
 	    "         (PCRE2 only. Compiled PCRE2 regular expressions are\n\t"
 	    "         not portable across architectures. Use this flag\n\t"
 	    "         if you know that you build for an incompatible\n\t"
 	    "         architecture to save space. When linked against\n\t"
 	    "         PCRE1 this flag is ignored.)\n\t"
 	    "-i       Print regular expression info end exit. That is, back\n\t"
 	    "         end version and architecture identifier.\n\t"
 	    "         Arch identifier format (PCRE2):\n\t"
 	    "         <pointer width>-<size type width>-<endianness>, e.g.,\n\t"
 	    "         \"8-8-el\" for x86_64.\n\t"
 	    "fc_file  The text based file contexts file to be processed.\n",
 	    progname);
 		exit(EXIT_FAILURE);
 }

 int main(int argc, char *argv[])
 {
 	const char *path = NULL;
 	const char *out_file = NULL;
 	int do_write_precompregex = 1;
 	char stack_path[PATH_MAX + 1];
 	char *tmp = NULL;
 	int fd, rc, opt;
 	FILE *policy_fp = NULL;
 	struct stat buf;
 	struct selabel_handle *rec = NULL;
 	struct saved_data *data = NULL;

 	if (argc < 2)
 		usage(argv[0]);

 	while ((opt = getopt(argc, argv, "io:p:r")) > 0) {
 		switch (opt) {
 		case 'o':
 			out_file = optarg;
 			break;
 		case 'p':
 			policy_file = optarg;
 			break;
 		case 'r':
 			do_write_precompregex = 0;
 			break;
 		case 'i':
 			printf("%s (%s)\n", regex_version(),
 					regex_arch_string());
 			return 0;
 		default:
 			usage(argv[0]);
 		}
 	}

 	if (optind >= argc)
 		usage(argv[0]);

 	path = argv[optind];
 	if (stat(path, &buf) < 0) {
 		fprintf(stderr, "%s: could not stat: %s: %s\n", argv[0], path, strerror(errno));
 		exit(EXIT_FAILURE);
 	}

 	/* Open binary policy if supplied. */
 	if (policy_file) {
 		policy_fp = fopen(policy_file, "r");

 		if (!policy_fp) {
 			fprintf(stderr, "%s: failed to open %s: %s\n",
 				argv[0], policy_file, strerror(errno));
 			exit(EXIT_FAILURE);
 		}

 		if (sepol_set_policydb_from_file(policy_fp) < 0) {
 			fprintf(stderr, "%s: failed to load policy from %s\n",
 				argv[0], policy_file);
 			fclose(policy_fp);
 			exit(EXIT_FAILURE);
 		}
 	}

 	/* Generate dummy handle for process_line() function */
 	rec = (struct selabel_handle *)calloc(1, sizeof(*rec));
 	if (!rec) {
 		fprintf(stderr, "%s: calloc failed: %s\n", argv[0], strerror(errno));
 		if (policy_fp)
 			fclose(policy_fp);
 		exit(EXIT_FAILURE);
 	}
 	rec->backend = SELABEL_CTX_FILE;

 	/* Need to set validation on to get the bin file generated by the
 	 * process_line function, however as the bin file being generated
 	 * may not be related to the currently loaded policy (that it
 	 * would be validated against), then set callback to ignore any
 	 * validation - unless the -p option is used in which case if an
 	 * error is detected, the process will be aborted. */
 	rec->validating = 1;
 	selinux_set_callback(SELINUX_CB_VALIDATE,
 			    (union selinux_callback)&validate_context);

 	data = (struct saved_data *)calloc(1, sizeof(*data));
 	if (!data) {
 		fprintf(stderr, "%s: calloc failed: %s\n", argv[0], strerror(errno));
 		free(rec);
 		if (policy_fp)
 			fclose(policy_fp);
 		exit(EXIT_FAILURE);
 	}

 	rec->data = data;

 	rc = process_file(rec, path);
 	if (rc < 0) {
 		fprintf(stderr, "%s: process_file failed\n", argv[0]);
 		goto err;
 	}

 	rc = sort_specs(data);
 	if (rc) {
 		fprintf(stderr, "%s: sort_specs failed\n", argv[0]);
 		goto err;
 	}

 	if (out_file)
 		rc = snprintf(stack_path, sizeof(stack_path), "%s", out_file);
 	else
 		rc = snprintf(stack_path, sizeof(stack_path), "%s.bin", path);

 	if (rc < 0 || rc >= (int)sizeof(stack_path)) {
 		fprintf(stderr, "%s: snprintf failed\n", argv[0]);
 		goto err;
 	}

 	tmp = malloc(strlen(stack_path) + 7);
 	if (!tmp) {
 		fprintf(stderr, "%s: malloc failed: %s\n", argv[0], strerror(errno));
 		goto err;
 	}

 	rc = sprintf(tmp, "%sXXXXXX", stack_path);
 	if (rc < 0) {
 		fprintf(stderr, "%s: sprintf failed\n", argv[0]);
 		goto err;
 	}

 	fd  = mkstemp(tmp);
 	if (fd < 0) {
 		fprintf(stderr, "%s: mkstemp %s failed: %s\n", argv[0], tmp, strerror(errno));
 		goto err;
 	}

 	rc = fchmod(fd, buf.st_mode);
 	if (rc < 0) {
 		fprintf(stderr, "%s: fchmod %s failed: %s\n", argv[0], tmp, strerror(errno));
 		goto err_unlink;
 	}

 	rc = write_binary_file(data, fd, do_write_precompregex);
 	if (rc < 0) {
 		fprintf(stderr, "%s: write_binary_file %s failed\n", argv[0], tmp);
 		goto err_unlink;
 	}

 	rc = rename(tmp, stack_path);
 	if (rc < 0) {
 		fprintf(stderr, "%s: rename %s -> %s failed: %s\n", argv[0], tmp, stack_path, strerror(errno));
 		goto err_unlink;
 	}

 	rc = 0;
 out:
 	if (policy_fp)
 		fclose(policy_fp);

 	free_specs(data);
 	free(rec);
 	free(data);
 	free(tmp);
 	return rc;

 err_unlink:
 	unlink(tmp);
 err:
 	rc = -1;
 	goto out;
 }
	#include <ctype.h>
	#include <errno.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <getopt.h>
	#include <limits.h>
	#include <selinux/selinux.h>
	#include <sepol/sepol.h>

	#include "../src/label_file.h"
	#include "../src/regex.h"

	const char *policy_file;
	static int ctx_err;

	static int validate_context(char **ctxp)
	{
	char ctx = ctxp;

	if (policy_file && sepol_check_context(ctx) < 0) {
	ctx_err = -1;
	return ctx_err;
	}

	return 0;
	}

	static int process_file(struct selabel_handle rec, const char filename)
	{
	unsigned int line_num;
	int rc;
	char *line_buf = NULL;
	size_t line_len = 0;
	FILE *context_file;
	const char *prefix = NULL;

	context_file = fopen(filename, "r");
	if (!context_file) {
	fprintf(stderr, "Error opening %s: %s\n",
	filename, strerror(errno));
	return -1;
	}

	line_num = 0;
	rc = 0;
	while (getline(&line_buf, &line_len, context_file) > 0) {
	rc = process_line(rec, filename, prefix, line_buf, ++line_num);
	if (rc \|\| ctx_err) {
	/* With -p option need to check and fail if ctx err as
	* process_line() context validation on Linux does not
	* return an error, but does print the error line to
	* stderr. Android will set both to error and print
	* the error line. */
	rc = -1;
	goto out;
	}
	}
	out:
	free(line_buf);
	fclose(context_file);
	return rc;
	}

	/*
	* File Format
	*
	* u32 - magic number
	* u32 - version
	* u32 - length of pcre version EXCLUDING nul
	* char - pcre version string EXCLUDING nul
	* u32 - number of stems
	* ** Stems
	* u32 - length of stem EXCLUDING nul
	* char - stem char array INCLUDING nul
	* u32 - number of regexs
	* ** Regexes
	* u32 - length of upcoming context INCLUDING nul
	* char - char array of the raw context
	* u32 - length of the upcoming regex_str
	* char - char array of the original regex string including the stem.
	* u32 - mode bits for >= SELINUX_COMPILED_FCONTEXT_MODE
	* mode_t for <= SELINUX_COMPILED_FCONTEXT_PCRE_VERS
	* s32 - stemid associated with the regex
	* u32 - spec has meta characters
	* u32 - The specs prefix_len if >= SELINUX_COMPILED_FCONTEXT_PREFIX_LEN
	* u32 - data length of the pcre regex
	* char - a buffer holding the raw pcre regex info
	* u32 - data length of the pcre regex study daya
	* char - a buffer holding the raw pcre regex study data
	*/
	static int write_binary_file(struct saved_data *data, int fd,
	int do_write_precompregex)
	{
	struct spec *specs = data->spec_arr;
	FILE *bin_file;
	size_t len;
	uint32_t magic = SELINUX_MAGIC_COMPILED_FCONTEXT;
	uint32_t section_len;
	uint32_t i;
	int rc;
	const char *reg_version;
	const char *reg_arch;

	bin_file = fdopen(fd, "w");
	if (!bin_file) {
	perror("fopen output_file");
	exit(EXIT_FAILURE);
	}

	/* write some magic number */
	len = fwrite(&magic, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* write the version */
	section_len = SELINUX_COMPILED_FCONTEXT_MAX_VERS;
	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* write version of the regex back-end */
	reg_version = regex_version();
	if (!reg_version)
	goto err;
	section_len = strlen(reg_version);
	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;
	len = fwrite(reg_version, sizeof(char), section_len, bin_file);
	if (len != section_len)
	goto err;

	/* write regex arch string */
	reg_arch = regex_arch_string();
	if (!reg_arch)
	goto err;
	section_len = strlen(reg_arch);
	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;
	len = fwrite(reg_arch, sizeof(char), section_len, bin_file);
	if (len != section_len)
	goto err;

	/* write the number of stems coming */
	section_len = data->num_stems;
	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	for (i = 0; i < section_len; i++) {
	char *stem = data->stem_arr[i].buf;
	uint32_t stem_len = data->stem_arr[i].len;

	/* write the strlen (aka no nul) */
	len = fwrite(&stem_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* include the nul in the file */
	stem_len += 1;
	len = fwrite(stem, sizeof(char), stem_len, bin_file);
	if (len != stem_len)
	goto err;
	}

	/* write the number of regexes coming */
	section_len = data->nspec;
	len = fwrite(&section_len, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	for (i = 0; i < section_len; i++) {
	char *context = specs[i].lr.ctx_raw;
	char *regex_str = specs[i].regex_str;
	mode_t mode = specs[i].mode;
	size_t prefix_len = specs[i].prefix_len;
	int32_t stem_id = specs[i].stem_id;
	struct regex_data *re = specs[i].regex;
	uint32_t to_write;

	/* length of the context string (including nul) */
	to_write = strlen(context) + 1;
	len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* original context strin (including nul) */
	len = fwrite(context, sizeof(char), to_write, bin_file);
	if (len != to_write)
	goto err;

	/* length of the original regex string (including nul) */
	to_write = strlen(regex_str) + 1;
	len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* original regex string */
	len = fwrite(regex_str, sizeof(char), to_write, bin_file);
	if (len != to_write)
	goto err;

	/* binary F_MODE bits */
	to_write = mode;
	len = fwrite(&to_write, sizeof(uint32_t), 1, bin_file);
	if (len != 1)
	goto err;

	/* stem for this regex (could be -1) */
	len = fwrite(&stem_id, sizeof(stem_id), 1, bin_file);
	if (len != 1)
	goto err;

	/* does this spec have a metaChar? */
	to_write = specs[i].hasMetaChars;
	len = fwrite(&to_write, sizeof(to_write), 1, bin_file);
	if (len != 1)
	goto err;

	/* For SELINUX_COMPILED_FCONTEXT_PREFIX_LEN */
	to_write = prefix_len;
	len = fwrite(&to_write, sizeof(to_write), 1, bin_file);
	if (len != 1)
	goto err;

	/* Write regex related data */
	rc = regex_writef(re, bin_file, do_write_precompregex);
	if (rc < 0)
	goto err;
	}

	rc = 0;
	out:
	fclose(bin_file);
	return rc;
	err:
	rc = -1;
	goto out;
	}

	static void free_specs(struct saved_data *data)
	{
	struct spec *specs = data->spec_arr;
	unsigned int num_entries = data->nspec;
	unsigned int i;

	for (i = 0; i < num_entries; i++) {
	free(specs[i].lr.ctx_raw);
	free(specs[i].lr.ctx_trans);
	free(specs[i].regex_str);
	free(specs[i].type_str);
	regex_data_free(specs[i].regex);
	}
	free(specs);

	num_entries = data->num_stems;
	for (i = 0; i < num_entries; i++)
	free(data->stem_arr[i].buf);
	free(data->stem_arr);

	memset(data, 0, sizeof(*data));
	}

	static __attribute__ ((__noreturn__)) void usage(const char *progname)
	{
	fprintf(stderr,
	"usage: %s [-o out_file] [-p policy_file] fc_file\n"
	"Where:\n\t"
	"-o Optional file name of the PCRE formatted binary\n\t"
	" file to be output. If not specified the default\n\t"
	" will be fc_file with the .bin suffix appended.\n\t"
	"-p Optional binary policy file that will be used to\n\t"
	" validate contexts defined in the fc_file.\n\t"
	"-r Omit precompiled regular expressions from the output.\n\t"
	" (PCRE2 only. Compiled PCRE2 regular expressions are\n\t"
	" not portable across architectures. Use this flag\n\t"
	" if you know that you build for an incompatible\n\t"
	" architecture to save space. When linked against\n\t"
	" PCRE1 this flag is ignored.)\n\t"
	"-i Print regular expression info end exit. That is, back\n\t"
	" end version and architecture identifier.\n\t"
	" Arch identifier format (PCRE2):\n\t"
	" <pointer width>-<size type width>-<endianness>, e.g.,\n\t"
	" \"8-8-el\" for x86_64.\n\t"
	"fc_file The text based file contexts file to be processed.\n",
	progname);
	exit(EXIT_FAILURE);
	}

	int main(int argc, char *argv[])
	{
	const char *path = NULL;
	const char *out_file = NULL;
	int do_write_precompregex = 1;
	char stack_path[PATH_MAX + 1];
	char *tmp = NULL;
	int fd, rc, opt;
	FILE *policy_fp = NULL;
	struct stat buf;
	struct selabel_handle *rec = NULL;
	struct saved_data *data = NULL;

	if (argc < 2)
	usage(argv[0]);

	while ((opt = getopt(argc, argv, "io:p:r")) > 0) {
	switch (opt) {
	case 'o':
	out_file = optarg;
	break;
	case 'p':
	policy_file = optarg;
	break;
	case 'r':
	do_write_precompregex = 0;
	break;
	case 'i':
	printf("%s (%s)\n", regex_version(),
	regex_arch_string());
	return 0;
	default:
	usage(argv[0]);
	}
	}

	if (optind >= argc)
	usage(argv[0]);

	path = argv[optind];
	if (stat(path, &buf) < 0) {
	fprintf(stderr, "%s: could not stat: %s: %s\n", argv[0], path, strerror(errno));
	exit(EXIT_FAILURE);
	}

	/* Open binary policy if supplied. */
	if (policy_file) {
	policy_fp = fopen(policy_file, "r");

	if (!policy_fp) {
	fprintf(stderr, "%s: failed to open %s: %s\n",
	argv[0], policy_file, strerror(errno));
	exit(EXIT_FAILURE);
	}

	if (sepol_set_policydb_from_file(policy_fp) < 0) {
	fprintf(stderr, "%s: failed to load policy from %s\n",
	argv[0], policy_file);
	fclose(policy_fp);
	exit(EXIT_FAILURE);
	}
	}

	/* Generate dummy handle for process_line() function */
	rec = (struct selabel_handle )calloc(1, sizeof(rec));
	if (!rec) {
	fprintf(stderr, "%s: calloc failed: %s\n", argv[0], strerror(errno));
	if (policy_fp)
	fclose(policy_fp);
	exit(EXIT_FAILURE);
	}
	rec->backend = SELABEL_CTX_FILE;

	/* Need to set validation on to get the bin file generated by the
	* process_line function, however as the bin file being generated
	* may not be related to the currently loaded policy (that it
	* would be validated against), then set callback to ignore any
	* validation - unless the -p option is used in which case if an
	* error is detected, the process will be aborted. */
	rec->validating = 1;
	selinux_set_callback(SELINUX_CB_VALIDATE,
	(union selinux_callback)&validate_context);

	data = (struct saved_data )calloc(1, sizeof(data));
	if (!data) {
	fprintf(stderr, "%s: calloc failed: %s\n", argv[0], strerror(errno));
	free(rec);
	if (policy_fp)
	fclose(policy_fp);
	exit(EXIT_FAILURE);
	}

	rec->data = data;

	rc = process_file(rec, path);
	if (rc < 0) {
	fprintf(stderr, "%s: process_file failed\n", argv[0]);
	goto err;
	}

	rc = sort_specs(data);
	if (rc) {
	fprintf(stderr, "%s: sort_specs failed\n", argv[0]);
	goto err;
	}

	if (out_file)
	rc = snprintf(stack_path, sizeof(stack_path), "%s", out_file);
	else
	rc = snprintf(stack_path, sizeof(stack_path), "%s.bin", path);

	if (rc < 0 \|\| rc >= (int)sizeof(stack_path)) {
	fprintf(stderr, "%s: snprintf failed\n", argv[0]);
	goto err;
	}

	tmp = malloc(strlen(stack_path) + 7);
	if (!tmp) {
	fprintf(stderr, "%s: malloc failed: %s\n", argv[0], strerror(errno));
	goto err;
	}

	rc = sprintf(tmp, "%sXXXXXX", stack_path);
	if (rc < 0) {
	fprintf(stderr, "%s: sprintf failed\n", argv[0]);
	goto err;
	}

	fd = mkstemp(tmp);
	if (fd < 0) {
	fprintf(stderr, "%s: mkstemp %s failed: %s\n", argv[0], tmp, strerror(errno));
	goto err;
	}

	rc = fchmod(fd, buf.st_mode);
	if (rc < 0) {
	fprintf(stderr, "%s: fchmod %s failed: %s\n", argv[0], tmp, strerror(errno));
	goto err_unlink;
	}

	rc = write_binary_file(data, fd, do_write_precompregex);
	if (rc < 0) {
	fprintf(stderr, "%s: write_binary_file %s failed\n", argv[0], tmp);
	goto err_unlink;
	}

	rc = rename(tmp, stack_path);
	if (rc < 0) {
	fprintf(stderr, "%s: rename %s -> %s failed: %s\n", argv[0], tmp, stack_path, strerror(errno));
	goto err_unlink;
	}

	rc = 0;
	out:
	if (policy_fp)
	fclose(policy_fp);

	free_specs(data);
	free(rec);
	free(data);
	free(tmp);
	return rc;

	err_unlink:
	unlink(tmp);
	err:
	rc = -1;
	goto out;
	}