gentoo-projects/pax-utils/scanelf.c

/*
 * Copyright 2003 Ned Ludd <solar@gentoo.org>
 * Copyright 1999-2005 Gentoo Foundation
 * Distributed under the terms of the GNU General Public License v2
 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.27 2005/04/05 01:44:08 vapier Exp $
 *
 ********************************************************************
 * 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., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#define __USE_GNU
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>
#include <getopt.h>
#include <assert.h>

#include "paxelf.h"

static const char *rcsid = "$Id: scanelf.c,v 1.27 2005/04/05 01:44:08 vapier Exp $";


/* helper functions for showing errors */
#define argv0 "scanelf" /*((*argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
#define warn(fmt, args...) \
        fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
#define err(fmt, args...) \
        do { \
        warn(fmt, ## args); \
        exit(EXIT_FAILURE); \
        } while (0)


/* prototypes */
static void scanelf_file(const char *filename);
static void scanelf_dir(const char *path);
static void scanelf_ldpath();
static void scanelf_envpath();
static void usage(int status);
static void parseargs(int argc, char *argv[]);

/* variables to control behavior */
static char scan_ldpath = 0;
static char scan_envpath = 0;
static char dir_recurse = 0;
static char dir_crossmount = 1;
static char show_pax = 0;
static char show_stack = 0;
static char show_textrel = 0;
static char show_rpath = 0;
static char show_banner = 1;
static char be_quiet = 0;
static char be_verbose = 0;
static char *find_sym = NULL;


/* scan an elf file and show all the fun stuff */
static void scanelf_file(const char *filename)
{
        int i;
        char found_pax, found_stack, found_relro, found_textrel, found_rpath, found_sym;
        elfobj *elf;

        found_pax = found_stack = found_relro = found_textrel = found_rpath = found_sym = 0;

        /* verify this is real ELF */
        if ((elf = readelf(filename)) == NULL) {
                if (be_verbose > 2) printf("%s: not an ELF\n", filename);
                return;
        }

        if (be_verbose > 1)
                printf("%s: {%s,%s} scanning file\n", filename,
                       get_elfeitype(elf, EI_CLASS, elf->elf_class),
                       get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
        else if (be_verbose)
                printf("%s: scanning file\n", filename);

        /* show the header */
        if (!be_quiet && show_banner) {
                printf(" TYPE  ");
                if (show_pax) printf("  PAX  ");
                if (show_stack) printf(" STK/REL ");
                if (show_textrel) printf("TEXTREL ");
                if (show_rpath) printf("RPATH ");
                printf(" FILE\n");
                show_banner = 0;
        }

        /* dump all the good stuff */
        if (!be_quiet)
                printf("%-7s ", get_elfetype(elf));

        if (show_pax) {
                char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
                if (!be_quiet || (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
                        found_pax = 1;
                        printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
                }
        }

        /* stack fun */
        if (show_stack) {
#define SHOW_STACK(B) \
                if (elf->elf_class == ELFCLASS ## B) { \
                Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
                Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
                for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
                        if (EGET(phdr[i].p_type) != PT_GNU_STACK && \
                            EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
                        if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
                                continue; \
                        if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
                                found_stack = 1; \
                        if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
                                found_relro = 1; \
                        printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
                } \
                }
                SHOW_STACK(32)
                SHOW_STACK(64)
                if (!be_quiet && !found_stack) printf("--- ");
                if (!be_quiet && !found_relro) printf("--- ");
        }

        /* textrel fun */
        if (show_textrel) {
#define SHOW_TEXTREL(B) \
                if (elf->elf_class == ELFCLASS ## B) { \
                Elf ## B ## _Dyn *dyn; \
                Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
                Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
                for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
                        if (phdr[i].p_type != PT_DYNAMIC) continue; \
                        dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
                        while (EGET(dyn->d_tag) != DT_NULL) { \
                                if (EGET(dyn->d_tag) == DT_TEXTREL) { /*dyn->d_tag != DT_FLAGS)*/ \
                                        found_textrel = 1; \
                                        /*if (dyn->d_un.d_val & DF_TEXTREL)*/ \
                                        printf("TEXTREL "); \
                                } \
                                ++dyn; \
                        } \
                } }
                SHOW_TEXTREL(32)
                SHOW_TEXTREL(64)
                if (!be_quiet && !found_textrel) printf("------- ");
        }

        /* rpath fun */
        /* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
        if (show_rpath) {
                char *rpath, *runpath;
                void *strtbl_void = elf_findsecbyname(elf, ".dynstr");
                rpath = runpath = NULL;

                if (strtbl_void) {
#define SHOW_RPATH(B) \
                if (elf->elf_class == ELFCLASS ## B) { \
                Elf ## B ## _Dyn *dyn; \
                Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
                Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
                Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
                for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
                        if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
                        dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
                        while (EGET(dyn->d_tag) != DT_NULL) { \
                                if (EGET(dyn->d_tag) == DT_RPATH) { \
                                        rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
                                        found_rpath = 1; \
                                } else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
                                        runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
                                        found_rpath = 1; \
                                } \
                                ++dyn; \
                        } \
                } }
                SHOW_RPATH(32)
                SHOW_RPATH(64)
                }
                if (rpath && runpath) {
                        if (!strcmp(rpath, runpath))
                                printf("%-5s ", runpath);
                        else {
                                fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath);
                                printf("{%s,%s} ", rpath, runpath);
                        }
                } else if (rpath || runpath)
                        printf("%-5s ", (runpath ? runpath : rpath));
                else if (!be_quiet && !found_rpath)
                        printf("  -   ");
        }

        if (find_sym) {
                void *symtab_void, *strtab_void;
                char found_sym = 0;
                char *versioned_symname = malloc(strlen(find_sym)+1);

                sprintf(versioned_symname, "%s@", find_sym);
                symtab_void = elf_findsecbyname(elf, ".symtab");
                strtab_void = elf_findsecbyname(elf, ".strtab");

                if (symtab_void && strtab_void) {
#define FIND_SYM(B) \
                if (elf->elf_class == ELFCLASS ## B) { \
                Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
                Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
                Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
                int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
                char *symname; \
                for (i = 0; i < cnt; ++i) { \
                        if (sym->st_name) { \
                                symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
                                if (*find_sym == '*') { \
                                        printf("%s(%s) %5lX %15s %s\n", ((found_sym == 0) ? "\n\t" : "\t"), \
                                                (char *) basename(filename), \
                                                (long)sym->st_size, (char *) get_elfstttype(sym->st_info & 0xF), \
                                                symname); \
                                                found_sym = 1; \
                                } \
                                if ((strcmp(find_sym, symname) == 0) || \
                                        (strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) \
                                        found_sym++; \
                        } \
                        ++sym; \
                } }
                FIND_SYM(32)
                FIND_SYM(64)
                }
                free(versioned_symname);
                if (*find_sym != '*')
                        printf(" %s ", (found_sym == 0) ? "-" : find_sym);
        }

        if (!be_quiet || found_pax || found_stack || found_textrel || found_rpath)
                printf("%s\n", filename);

        unreadelf(elf);
}

/* scan a directory for ET_EXEC files and print when we find one */
static void scanelf_dir(const char *path)
{
        register DIR *dir;
        register struct dirent *dentry;
        struct stat st_top, st;
        char buf[_POSIX_PATH_MAX];
        size_t len = 0;

        /* make sure path exists */
        if (lstat(path, &st_top) == -1)
                return;

        /* ok, if it isn't a directory, assume we can open it */
        if (!S_ISDIR(st_top.st_mode)) {
                scanelf_file(path);
                return;
        }

        /* now scan the dir looking for fun stuff */
        if ((dir = opendir(path)) == NULL) {
                warnf("could not opendir %s: %s", path, strerror(errno));
                return;
        }
        if (be_verbose) printf("%s: scanning dir\n", path);

        while ((dentry = readdir(dir))) {
                if (!strcmp(dentry->d_name, ".") || !strcmp(dentry->d_name, ".."))
                        continue;
                len = (strlen(path) + 2 + strlen(dentry->d_name));
                assert(len < sizeof(buf));
                strncpy(buf, path, len);
                strncat(buf, "/", len);
                strncat(buf, dentry->d_name, len);
                buf[sizeof(buf)] = 0;
                if (lstat(buf, &st) != -1) {
                        if (S_ISREG(st.st_mode))
                                scanelf_file(buf);
                        else if (dir_recurse && S_ISDIR(st.st_mode)) {
                                if (dir_crossmount || (st_top.st_dev == st.st_dev))
                                        scanelf_dir(buf);
                        }
                }
        }
        closedir(dir);
}

/* scan /etc/ld.so.conf for paths */
static void scanelf_ldpath()
{
        char scan_l, scan_ul, scan_ull;
        char *path, *p;
        FILE *fp;

        if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
                err("Unable to open ld.so.conf: %s", strerror(errno));

        scan_l = scan_ul = scan_ull = 0;

        path = malloc(_POSIX_PATH_MAX);
        while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
                if (*path == '/') {
                        if ((p = strrchr(path, '\r')) != NULL)
                                *p = 0;
                        if ((p = strrchr(path, '\n')) != NULL)
                                *p = 0;
                        if (!scan_l   && !strcmp(path, "/lib")) scan_l = 1;
                        if (!scan_ul  && !strcmp(path, "/usr/lib")) scan_ul = 1;
                        if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
                        scanelf_dir(path);
                }
        free(path);

        if (!scan_l)   scanelf_dir("/lib");
        if (!scan_ul)  scanelf_dir("/usr/lib");
        if (!scan_ull) scanelf_dir("/usr/local/lib");

        fclose(fp);
}

/* scan env PATH for paths */
static void scanelf_envpath()
{
        char *path, *p;

        path = getenv("PATH");
        if (!path)
                err("PATH is not set in your env !");

        if ((path = strdup(path)) == NULL)
                err("stdup failed: %s", strerror(errno));

        while ((p = strrchr(path, ':')) != NULL) {
                scanelf_dir(p + 1);
                *p = 0;
        }

        free(path);
}


/* usage / invocation handling functions */
#define PARSE_FLAGS "plRmxetrs:aqvo:BhV"
#define a_argument required_argument
static struct option const long_opts[] = {
        {"path",      no_argument, NULL, 'p'},
        {"ldpath",    no_argument, NULL, 'l'},
        {"recursive", no_argument, NULL, 'R'},
        {"mount",     no_argument, NULL, 'm'},
        {"pax",       no_argument, NULL, 'x'},
        {"header",    no_argument, NULL, 'e'},
        {"textrel",   no_argument, NULL, 't'},
        {"rpath",     no_argument, NULL, 'r'},
        {"symbol",    a_argument,  NULL, 's'},
        {"all",       no_argument, NULL, 'a'},
        {"quiet",     no_argument, NULL, 'q'},
        {"verbose",   no_argument, NULL, 'v'},
        {"file",      a_argument,  NULL, 'o'},
        {"nobanner",  no_argument, NULL, 'B'},
        {"help",      no_argument, NULL, 'h'},
        {"version",   no_argument, NULL, 'V'},
        {NULL,        no_argument, NULL, 0x0}
};
static char *opts_help[] = {
        "Scan all directories in PATH environment",
        "Scan all directories in /etc/ld.so.conf",
        "Scan directories recursively",
        "Don't recursively cross mount points\n",
        "Print PaX markings",
        "Print GNU_STACK markings",
        "Print TEXTREL information",
        "Print RPATH information",
        "Find a specified symbol",
        "Print all scanned info (-x -e -t -r)\n",
        "Only output 'bad' things",
        "Be verbose (can be specified more than once)",
        "Write output stream to a filename",
        "Don't display the header",
        "Print this help and exit",
        "Print version and exit",
        NULL
};

/* display usage and exit */
static void usage(int status)
{
        int i;
        printf("¤ Scan ELF binaries for stuff\n"
               "Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0);
        printf("Options:\n");
        for (i = 0; long_opts[i].name; ++i)
                if (long_opts[i].has_arg == no_argument)
                        printf("  -%c, --%-13s× %s\n", long_opts[i].val, 
                               long_opts[i].name, opts_help[i]);
                else
                        printf("  -%c, --%-6s <arg> × %s\n", long_opts[i].val,
                               long_opts[i].name, opts_help[i]);
        exit(status);
}

/* parse command line arguments and preform needed actions */
static void parseargs(int argc, char *argv[])
{
        int flag;

        opterr = 0;
        while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
                switch (flag) {

                case 'V':                        /* version info */
                        printf("%s compiled %s\n%s\n"
                               "%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
                               __FILE__, __DATE__, rcsid, argv0);
                        exit(EXIT_SUCCESS);
                        break;
                case 'h': usage(EXIT_SUCCESS); break;

                case 'o': {
                        FILE *fp = NULL;
                        fp = freopen(optarg, "w", stdout);
                        if (fp == NULL)
                                err("Could not open output stream '%s': %s", optarg, strerror(errno));
                        stdout = fp;
                        break;
                }

                case 's': find_sym = strdup(optarg); break;

                case 'B': show_banner = 0; break;
                case 'l': scan_ldpath = 1; break;
                case 'p': scan_envpath = 1; break;
                case 'R': dir_recurse = 1; break;
                case 'm': dir_crossmount = 0; break;
                case 'x': show_pax = 1; break;
                case 'e': show_stack = 1; break;
                case 't': show_textrel = 1; break;
                case 'r': show_rpath = 1; break;
                case 'q': be_quiet = 1; break;
                case 'v': be_verbose = (be_verbose % 20) + 1; break;
                case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break;

                case ':':
                        warn("Option missing parameter");
                        usage(EXIT_FAILURE);
                        break;
                case '?':
                        warn("Unknown option");
                        usage(EXIT_FAILURE);
                        break;
                default:
                        err("Unhandled option '%c'", flag);
                        break;
                }
        }

        if (be_quiet && be_verbose)
                err("You can be quiet or you can be verbose, not both, stupid");

        if (scan_ldpath) scanelf_ldpath();
        if (scan_envpath) scanelf_envpath();
        if (optind == argc && !scan_ldpath && !scan_envpath)
                err("Nothing to scan !?");
        while (optind < argc)
                scanelf_dir(argv[optind++]);

        if (find_sym) free(find_sym);
}


int main(int argc, char *argv[])
{
        if (argc < 2)
                usage(EXIT_FAILURE);
        parseargs(argc, argv);
        fclose(stdout);
        return EXIT_SUCCESS;
}
1	/*
2	* Copyright 2003 Ned Ludd <solar@gentoo.org>
3	* Copyright 1999-2005 Gentoo Foundation
4	* Distributed under the terms of the GNU General Public License v2
5	* $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.27 2005/04/05 01:44:08 vapier Exp $
6	*
7	********************************************************************
8	* This program is free software; you can redistribute it and/or
9	* modify it under the terms of the GNU General Public License as
10	* published by the Free Software Foundation; either version 2 of the
11	* License, or (at your option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful, but
14	* WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* General Public License for more details.
17	*
18	* You should have received a copy of the GNU General Public License
19	* along with this program; if not, write to the Free Software
20	* Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21	* MA 02111-1307, USA.
22	*/
23
24	#include <stdio.h>
25	#include <stdlib.h>
26	#include <sys/types.h>
27	#define __USE_GNU
28	#include <string.h>
29	#include <errno.h>
30	#include <unistd.h>
31	#include <sys/stat.h>
32	#include <dirent.h>
33	#include <getopt.h>
34	#include <assert.h>
35
36	#include "paxelf.h"
37
38	static const char *rcsid = "$Id: scanelf.c,v 1.27 2005/04/05 01:44:08 vapier Exp $";
39
40
41	/* helper functions for showing errors */
42	#define argv0 "scanelf" /((argv != NULL) ? argv[0] : __FILE__ "\b\b")*/
43	#define warn(fmt, args...) \
44	fprintf(stderr, "%s: " fmt "\n", argv0, ## args)
45	#define warnf(fmt, args...) warn("%s(): " fmt, __FUNCTION__, ## args)
46	#define err(fmt, args...) \
47	do { \
48	warn(fmt, ## args); \
49	exit(EXIT_FAILURE); \
50	} while (0)
51
52
53
54	/* prototypes */
55	static void scanelf_file(const char *filename);
56	static void scanelf_dir(const char *path);
57	static void scanelf_ldpath();
58	static void scanelf_envpath();
59	static void usage(int status);
60	static void parseargs(int argc, char *argv[]);
61
62	/* variables to control behavior */
63	static char scan_ldpath = 0;
64	static char scan_envpath = 0;
65	static char dir_recurse = 0;
66	static char dir_crossmount = 1;
67	static char show_pax = 0;
68	static char show_stack = 0;
69	static char show_textrel = 0;
70	static char show_rpath = 0;
71	static char show_banner = 1;
72	static char be_quiet = 0;
73	static char be_verbose = 0;
74	static char *find_sym = NULL;
75
76
77
78	/* scan an elf file and show all the fun stuff */
79	static void scanelf_file(const char *filename)
80	{
81	int i;
82	char found_pax, found_stack, found_relro, found_textrel, found_rpath, found_sym;
83	elfobj *elf;
84
85	found_pax = found_stack = found_relro = found_textrel = found_rpath = found_sym = 0;
86
87	/* verify this is real ELF */
88	if ((elf = readelf(filename)) == NULL) {
89	if (be_verbose > 2) printf("%s: not an ELF\n", filename);
90	return;
91	}
92
93	if (be_verbose > 1)
94	printf("%s: {%s,%s} scanning file\n", filename,
95	get_elfeitype(elf, EI_CLASS, elf->elf_class),
96	get_elfeitype(elf, EI_DATA, elf->data[EI_DATA]));
97	else if (be_verbose)
98	printf("%s: scanning file\n", filename);
99
100	/* show the header */
101	if (!be_quiet && show_banner) {
102	printf(" TYPE ");
103	if (show_pax) printf(" PAX ");
104	if (show_stack) printf(" STK/REL ");
105	if (show_textrel) printf("TEXTREL ");
106	if (show_rpath) printf("RPATH ");
107	printf(" FILE\n");
108	show_banner = 0;
109	}
110
111	/* dump all the good stuff */
112	if (!be_quiet)
113	printf("%-7s ", get_elfetype(elf));
114
115	if (show_pax) {
116	char *paxflags = pax_short_hf_flags(PAX_FLAGS(elf));
117	if (!be_quiet \|\| (be_quiet && strncmp(paxflags, "PeMRxS", 6))) {
118	found_pax = 1;
119	printf("%s ", pax_short_hf_flags(PAX_FLAGS(elf)));
120	}
121	}
122
123	/* stack fun */
124	if (show_stack) {
125	#define SHOW_STACK(B) \
126	if (elf->elf_class == ELFCLASS ## B) { \
127	Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
128	Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
129	for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
130	if (EGET(phdr[i].p_type) != PT_GNU_STACK && \
131	EGET(phdr[i].p_type) != PT_GNU_RELRO) continue; \
132	if (be_quiet && !(EGET(phdr[i].p_flags) & PF_X)) \
133	continue; \
134	if (EGET(phdr[i].p_type) == PT_GNU_STACK) \
135	found_stack = 1; \
136	if (EGET(phdr[i].p_type) == PT_GNU_RELRO) \
137	found_relro = 1; \
138	printf("%s ", gnu_short_stack_flags(EGET(phdr[i].p_flags))); \
139	} \
140	}
141	SHOW_STACK(32)
142	SHOW_STACK(64)
143	if (!be_quiet && !found_stack) printf("--- ");
144	if (!be_quiet && !found_relro) printf("--- ");
145	}
146
147	/* textrel fun */
148	if (show_textrel) {
149	#define SHOW_TEXTREL(B) \
150	if (elf->elf_class == ELFCLASS ## B) { \
151	Elf ## B ## _Dyn *dyn; \
152	Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
153	Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
154	for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
155	if (phdr[i].p_type != PT_DYNAMIC) continue; \
156	dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
157	while (EGET(dyn->d_tag) != DT_NULL) { \
158	if (EGET(dyn->d_tag) == DT_TEXTREL) { /dyn->d_tag != DT_FLAGS)/ \
159	found_textrel = 1; \
160	/if (dyn->d_un.d_val & DF_TEXTREL)/ \
161	printf("TEXTREL "); \
162	} \
163	++dyn; \
164	} \
165	} }
166	SHOW_TEXTREL(32)
167	SHOW_TEXTREL(64)
168	if (!be_quiet && !found_textrel) printf("------- ");
169	}
170
171	/* rpath fun */
172	/* TODO: if be_quiet, only output RPATH's which aren't in /etc/ld.so.conf */
173	if (show_rpath) {
174	char rpath, runpath;
175	void *strtbl_void = elf_findsecbyname(elf, ".dynstr");
176	rpath = runpath = NULL;
177
178	if (strtbl_void) {
179	#define SHOW_RPATH(B) \
180	if (elf->elf_class == ELFCLASS ## B) { \
181	Elf ## B ## _Dyn *dyn; \
182	Elf ## B ## _Ehdr *ehdr = EHDR ## B (elf->ehdr); \
183	Elf ## B ## _Phdr *phdr = PHDR ## B (elf->phdr); \
184	Elf ## B ## _Shdr *strtbl = SHDR ## B (strtbl_void); \
185	for (i = 0; i < EGET(ehdr->e_phnum); i++) { \
186	if (EGET(phdr[i].p_type) != PT_DYNAMIC) continue; \
187	dyn = DYN ## B (elf->data + EGET(phdr[i].p_offset)); \
188	while (EGET(dyn->d_tag) != DT_NULL) { \
189	if (EGET(dyn->d_tag) == DT_RPATH) { \
190	rpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
191	found_rpath = 1; \
192	} else if (EGET(dyn->d_tag) == DT_RUNPATH) { \
193	runpath = elf->data + EGET(strtbl->sh_offset) + EGET(dyn->d_un.d_ptr); \
194	found_rpath = 1; \
195	} \
196	++dyn; \
197	} \
198	} }
199	SHOW_RPATH(32)
200	SHOW_RPATH(64)
201	}
202	if (rpath && runpath) {
203	if (!strcmp(rpath, runpath))
204	printf("%-5s ", runpath);
205	else {
206	fprintf(stderr, "%s's RPATH [%s] != RUNPATH [%s]\n", filename, rpath, runpath);
207	printf("{%s,%s} ", rpath, runpath);
208	}
209	} else if (rpath \|\| runpath)
210	printf("%-5s ", (runpath ? runpath : rpath));
211	else if (!be_quiet && !found_rpath)
212	printf(" - ");
213	}
214
215	if (find_sym) {
216	void symtab_void, strtab_void;
217	char found_sym = 0;
218	char *versioned_symname = malloc(strlen(find_sym)+1);
219
220	sprintf(versioned_symname, "%s@", find_sym);
221	symtab_void = elf_findsecbyname(elf, ".symtab");
222	strtab_void = elf_findsecbyname(elf, ".strtab");
223
224	if (symtab_void && strtab_void) {
225	#define FIND_SYM(B) \
226	if (elf->elf_class == ELFCLASS ## B) { \
227	Elf ## B ## _Shdr *symtab = SHDR ## B (symtab_void); \
228	Elf ## B ## _Shdr *strtab = SHDR ## B (strtab_void); \
229	Elf ## B ## _Sym *sym = SYM ## B (elf->data + EGET(symtab->sh_offset)); \
230	int cnt = EGET(symtab->sh_size) / EGET(symtab->sh_entsize); \
231	char *symname; \
232	for (i = 0; i < cnt; ++i) { \
233	if (sym->st_name) { \
234	symname = (char *)(elf->data + EGET(strtab->sh_offset) + EGET(sym->st_name)); \
235	if (find_sym == '') { \
236	printf("%s(%s) %5lX %15s %s\n", ((found_sym == 0) ? "\n\t" : "\t"), \
237	(char *) basename(filename), \
238	(long)sym->st_size, (char *) get_elfstttype(sym->st_info & 0xF), \
239	symname); \
240	found_sym = 1; \
241	} \
242	if ((strcmp(find_sym, symname) == 0) \|\| \
243	(strncmp(symname, versioned_symname, strlen(versioned_symname)) == 0)) \
244	found_sym++; \
245	} \
246	++sym; \
247	} }
248	FIND_SYM(32)
249	FIND_SYM(64)
250	}
251	free(versioned_symname);
252	if (find_sym != '')
253	printf(" %s ", (found_sym == 0) ? "-" : find_sym);
254	}
255
256	if (!be_quiet \|\| found_pax \|\| found_stack \|\| found_textrel \|\| found_rpath)
257	printf("%s\n", filename);
258
259	unreadelf(elf);
260	}
261
262	/* scan a directory for ET_EXEC files and print when we find one */
263	static void scanelf_dir(const char *path)
264	{
265	register DIR *dir;
266	register struct dirent *dentry;
267	struct stat st_top, st;
268	char buf[_POSIX_PATH_MAX];
269	size_t len = 0;
270
271	/* make sure path exists */
272	if (lstat(path, &st_top) == -1)
273	return;
274
275	/* ok, if it isn't a directory, assume we can open it */
276	if (!S_ISDIR(st_top.st_mode)) {
277	scanelf_file(path);
278	return;
279	}
280
281	/* now scan the dir looking for fun stuff */
282	if ((dir = opendir(path)) == NULL) {
283	warnf("could not opendir %s: %s", path, strerror(errno));
284	return;
285	}
286	if (be_verbose) printf("%s: scanning dir\n", path);
287
288	while ((dentry = readdir(dir))) {
289	if (!strcmp(dentry->d_name, ".") \|\| !strcmp(dentry->d_name, ".."))
290	continue;
291	len = (strlen(path) + 2 + strlen(dentry->d_name));
292	assert(len < sizeof(buf));
293	strncpy(buf, path, len);
294	strncat(buf, "/", len);
295	strncat(buf, dentry->d_name, len);
296	buf[sizeof(buf)] = 0;
297	if (lstat(buf, &st) != -1) {
298	if (S_ISREG(st.st_mode))
299	scanelf_file(buf);
300	else if (dir_recurse && S_ISDIR(st.st_mode)) {
301	if (dir_crossmount \|\| (st_top.st_dev == st.st_dev))
302	scanelf_dir(buf);
303	}
304	}
305	}
306	closedir(dir);
307	}
308
309	/* scan /etc/ld.so.conf for paths */
310	static void scanelf_ldpath()
311	{
312	char scan_l, scan_ul, scan_ull;
313	char path, p;
314	FILE *fp;
315
316	if ((fp = fopen("/etc/ld.so.conf", "r")) == NULL)
317	err("Unable to open ld.so.conf: %s", strerror(errno));
318
319	scan_l = scan_ul = scan_ull = 0;
320
321	path = malloc(_POSIX_PATH_MAX);
322	while ((fgets(path, _POSIX_PATH_MAX, fp)) != NULL)
323	if (*path == '/') {
324	if ((p = strrchr(path, '\r')) != NULL)
325	*p = 0;
326	if ((p = strrchr(path, '\n')) != NULL)
327	*p = 0;
328	if (!scan_l && !strcmp(path, "/lib")) scan_l = 1;
329	if (!scan_ul && !strcmp(path, "/usr/lib")) scan_ul = 1;
330	if (!scan_ull && !strcmp(path, "/usr/local/lib")) scan_ull = 1;
331	scanelf_dir(path);
332	}
333	free(path);
334
335	if (!scan_l) scanelf_dir("/lib");
336	if (!scan_ul) scanelf_dir("/usr/lib");
337	if (!scan_ull) scanelf_dir("/usr/local/lib");
338
339	fclose(fp);
340	}
341
342	/* scan env PATH for paths */
343	static void scanelf_envpath()
344	{
345	char path, p;
346
347	path = getenv("PATH");
348	if (!path)
349	err("PATH is not set in your env !");
350
351	if ((path = strdup(path)) == NULL)
352	err("stdup failed: %s", strerror(errno));
353
354	while ((p = strrchr(path, ':')) != NULL) {
355	scanelf_dir(p + 1);
356	*p = 0;
357	}
358
359	free(path);
360	}
361
362
363
364	/* usage / invocation handling functions */
365	#define PARSE_FLAGS "plRmxetrs:aqvo:BhV"
366	#define a_argument required_argument
367	static struct option const long_opts[] = {
368	{"path", no_argument, NULL, 'p'},
369	{"ldpath", no_argument, NULL, 'l'},
370	{"recursive", no_argument, NULL, 'R'},
371	{"mount", no_argument, NULL, 'm'},
372	{"pax", no_argument, NULL, 'x'},
373	{"header", no_argument, NULL, 'e'},
374	{"textrel", no_argument, NULL, 't'},
375	{"rpath", no_argument, NULL, 'r'},
376	{"symbol", a_argument, NULL, 's'},
377	{"all", no_argument, NULL, 'a'},
378	{"quiet", no_argument, NULL, 'q'},
379	{"verbose", no_argument, NULL, 'v'},
380	{"file", a_argument, NULL, 'o'},
381	{"nobanner", no_argument, NULL, 'B'},
382	{"help", no_argument, NULL, 'h'},
383	{"version", no_argument, NULL, 'V'},
384	{NULL, no_argument, NULL, 0x0}
385	};
386	static char *opts_help[] = {
387	"Scan all directories in PATH environment",
388	"Scan all directories in /etc/ld.so.conf",
389	"Scan directories recursively",
390	"Don't recursively cross mount points\n",
391	"Print PaX markings",
392	"Print GNU_STACK markings",
393	"Print TEXTREL information",
394	"Print RPATH information",
395	"Find a specified symbol",
396	"Print all scanned info (-x -e -t -r)\n",
397	"Only output 'bad' things",
398	"Be verbose (can be specified more than once)",
399	"Write output stream to a filename",
400	"Don't display the header",
401	"Print this help and exit",
402	"Print version and exit",
403	NULL
404	};
405
406	/* display usage and exit */
407	static void usage(int status)
408	{
409	int i;
410	printf("¤ Scan ELF binaries for stuff\n"
411	"Usage: %s [options] <dir1> [dir2 dirN ...]\n\n", argv0);
412	printf("Options:\n");
413	for (i = 0; long_opts[i].name; ++i)
414	if (long_opts[i].has_arg == no_argument)
415	printf(" -%c, --%-13s× %s\n", long_opts[i].val,
416	long_opts[i].name, opts_help[i]);
417	else
418	printf(" -%c, --%-6s <arg> × %s\n", long_opts[i].val,
419	long_opts[i].name, opts_help[i]);
420	exit(status);
421	}
422
423	/* parse command line arguments and preform needed actions */
424	static void parseargs(int argc, char *argv[])
425	{
426	int flag;
427
428	opterr = 0;
429	while ((flag=getopt_long(argc, argv, PARSE_FLAGS, long_opts, NULL)) != -1) {
430	switch (flag) {
431
432	case 'V': /* version info */
433	printf("%s compiled %s\n%s\n"
434	"%s written for Gentoo Linux by <solar and vapier @ gentoo.org>\n",
435	__FILE__, __DATE__, rcsid, argv0);
436	exit(EXIT_SUCCESS);
437	break;
438	case 'h': usage(EXIT_SUCCESS); break;
439
440	case 'o': {
441	FILE *fp = NULL;
442	fp = freopen(optarg, "w", stdout);
443	if (fp == NULL)
444	err("Could not open output stream '%s': %s", optarg, strerror(errno));
445	stdout = fp;
446	break;
447	}
448
449	case 's': find_sym = strdup(optarg); break;
450
451	case 'B': show_banner = 0; break;
452	case 'l': scan_ldpath = 1; break;
453	case 'p': scan_envpath = 1; break;
454	case 'R': dir_recurse = 1; break;
455	case 'm': dir_crossmount = 0; break;
456	case 'x': show_pax = 1; break;
457	case 'e': show_stack = 1; break;
458	case 't': show_textrel = 1; break;
459	case 'r': show_rpath = 1; break;
460	case 'q': be_quiet = 1; break;
461	case 'v': be_verbose = (be_verbose % 20) + 1; break;
462	case 'a': show_pax = show_stack = show_textrel = show_rpath = 1; break;
463
464	case ':':
465	warn("Option missing parameter");
466	usage(EXIT_FAILURE);
467	break;
468	case '?':
469	warn("Unknown option");
470	usage(EXIT_FAILURE);
471	break;
472	default:
473	err("Unhandled option '%c'", flag);
474	break;
475	}
476	}
477
478	if (be_quiet && be_verbose)
479	err("You can be quiet or you can be verbose, not both, stupid");
480
481	if (scan_ldpath) scanelf_ldpath();
482	if (scan_envpath) scanelf_envpath();
483	if (optind == argc && !scan_ldpath && !scan_envpath)
484	err("Nothing to scan !?");
485	while (optind < argc)
486	scanelf_dir(argv[optind++]);
487
488	if (find_sym) free(find_sym);
489	}
490
491
492
493	int main(int argc, char *argv[])
494	{
495	if (argc < 2)
496	usage(EXIT_FAILURE);
497	parseargs(argc, argv);
498	fclose(stdout);
499	return EXIT_SUCCESS;
500	}