root/scripts/selinux/genheaders/genheaders.c

DEFINITIONS

1. usage
2. stoupperx
3. main

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>

struct security_class_mapping {
        const char *name;
        const char *perms[sizeof(unsigned) * 8 + 1];
};

#include "classmap.h"
#include "initial_sid_to_string.h"

#define max(x, y) (((int)(x) > (int)(y)) ? x : y)

const char *progname;

static void usage(void)
{
        printf("usage: %s flask.h av_permissions.h\n", progname);
        exit(1);
}

static char *stoupperx(const char *s)
{
        char *s2 = strdup(s);
        char *p;

        if (!s2) {
                fprintf(stderr, "%s:  out of memory\n", progname);
                exit(3);
        }

        for (p = s2; *p; p++)
                *p = toupper(*p);
        return s2;
}

int main(int argc, char *argv[])
{
        int i, j, k;
        int isids_len;
        FILE *fout;
        const char *needle = "SOCKET";
        char *substr;

        progname = argv[0];

        if (argc < 3)
                usage();

        fout = fopen(argv[1], "w");
        if (!fout) {
                fprintf(stderr, "Could not open %s for writing:  %s\n",
                        argv[1], strerror(errno));
                exit(2);
        }

        for (i = 0; secclass_map[i].name; i++) {
                struct security_class_mapping *map = &secclass_map[i];
                map->name = stoupperx(map->name);
                for (j = 0; map->perms[j]; j++)
                        map->perms[j] = stoupperx(map->perms[j]);
        }

        isids_len = sizeof(initial_sid_to_string) / sizeof (char *);
        for (i = 1; i < isids_len; i++)
                initial_sid_to_string[i] = stoupperx(initial_sid_to_string[i]);

        fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
        fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");

        for (i = 0; secclass_map[i].name; i++) {
                struct security_class_mapping *map = &secclass_map[i];
                fprintf(fout, "#define SECCLASS_%s", map->name);
                for (j = 0; j < max(1, 40 - strlen(map->name)); j++)
                        fprintf(fout, " ");
                fprintf(fout, "%2d\n", i+1);
        }

        fprintf(fout, "\n");

        for (i = 1; i < isids_len; i++) {
                const char *s = initial_sid_to_string[i];
                fprintf(fout, "#define SECINITSID_%s", s);
                for (j = 0; j < max(1, 40 - strlen(s)); j++)
                        fprintf(fout, " ");
                fprintf(fout, "%2d\n", i);
        }
        fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
        fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
        fprintf(fout, "{\n");
        fprintf(fout, "\tbool sock = false;\n\n");
        fprintf(fout, "\tswitch (kern_tclass) {\n");
        for (i = 0; secclass_map[i].name; i++) {
                struct security_class_mapping *map = &secclass_map[i];
                substr = strstr(map->name, needle);
                if (substr && strcmp(substr, needle) == 0)
                        fprintf(fout, "\tcase SECCLASS_%s:\n", map->name);
        }
        fprintf(fout, "\t\tsock = true;\n");
        fprintf(fout, "\t\tbreak;\n");
        fprintf(fout, "\tdefault:\n");
        fprintf(fout, "\t\tbreak;\n");
        fprintf(fout, "\t}\n\n");
        fprintf(fout, "\treturn sock;\n");
        fprintf(fout, "}\n");

        fprintf(fout, "\n#endif\n");
        fclose(fout);

        fout = fopen(argv[2], "w");
        if (!fout) {
                fprintf(stderr, "Could not open %s for writing:  %s\n",
                        argv[2], strerror(errno));
                exit(4);
        }

        fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
        fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");

        for (i = 0; secclass_map[i].name; i++) {
                struct security_class_mapping *map = &secclass_map[i];
                for (j = 0; map->perms[j]; j++) {
                        fprintf(fout, "#define %s__%s", map->name,
                                map->perms[j]);
                        for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++)
                                fprintf(fout, " ");
                        fprintf(fout, "0x%08xUL\n", (1<<j));
                }
        }

        fprintf(fout, "\n#endif\n");
        fclose(fout);
        exit(0);
}