/[gentoo-projects]/pax-utils/scanelf.c
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Revision 1.105 Revision 1.106
1/* 1/*
2 * Copyright 2003-2006 Gentoo Foundation 2 * Copyright 2003-2006 Gentoo Foundation
3 * Distributed under the terms of the GNU General Public License v2 3 * Distributed under the terms of the GNU General Public License v2
4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.105 2006/01/13 12:12:52 vapier Exp $ 4 * $Header: /var/cvsroot/gentoo-projects/pax-utils/scanelf.c,v 1.106 2006/01/14 01:39:55 vapier Exp $
5 * 5 *
6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org> 6 * Copyright 2003-2006 Ned Ludd - <solar@gentoo.org>
7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org> 7 * Copyright 2004-2006 Mike Frysinger - <vapier@gentoo.org>
8 */ 8 */
9 9
10#include "paxinc.h" 10#include "paxinc.h"
11 11
12static const char *rcsid = "$Id: scanelf.c,v 1.105 2006/01/13 12:12:52 vapier Exp $"; 12static const char *rcsid = "$Id: scanelf.c,v 1.106 2006/01/14 01:39:55 vapier Exp $";
13#define argv0 "scanelf" 13#define argv0 "scanelf"
14 14
15#define IS_MODIFIER(c) (c == '%' || c == '#') 15#define IS_MODIFIER(c) (c == '%' || c == '#')
16 16
17 17
18 18
19/* prototypes */ 19/* prototypes */
20static int scanelf_elfobj(elfobj *elf);
20static int scanelf_elf(const char *filename); 21static int scanelf_elf(const char *filename, int fd, size_t len);
21static int scanelf_archive(const char *filename); 22static int scanelf_archive(const char *filename, int fd, size_t len);
22static void scanelf_file(const char *filename); 23static void scanelf_file(const char *filename);
23static void scanelf_dir(const char *path); 24static void scanelf_dir(const char *path);
24static void scanelf_ldpath(); 25static void scanelf_ldpath(void);
25static void scanelf_envpath(); 26static void scanelf_envpath(void);
26static void usage(int status); 27static void usage(int status);
27static void parseargs(int argc, char *argv[]); 28static void parseargs(int argc, char *argv[]);
28static char *xstrdup(const char *s); 29static char *xstrdup(const char *s);
29static void *xmalloc(size_t size); 30static void *xmalloc(size_t size);
30static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n); 31static void xstrncat(char **dst, const char *src, size_t *curr_len, size_t n);
… …
848 else 849 else
849 return (char *)" - "; 850 return (char *)" - ";
850} 851}
851/* scan an elf file and show all the fun stuff */ 852/* scan an elf file and show all the fun stuff */
852#define prints(str) write(fileno(stdout), str, strlen(str)) 853#define prints(str) write(fileno(stdout), str, strlen(str))
853static int scanelf_elf(const char *filename) 854static int scanelf_elfobj(elfobj *elf)
854{ 855{
855 unsigned long i; 856 unsigned long i;
856 char found_pax, found_phdr, found_relro, found_load, found_textrel, 857 char found_pax, found_phdr, found_relro, found_load, found_textrel,
857 found_rpath, found_needed, found_interp, found_bind, found_soname, 858 found_rpath, found_needed, found_interp, found_bind, found_soname,
858 found_sym, found_lib, found_file, found_textrels; 859 found_sym, found_lib, found_file, found_textrels;
859 elfobj *elf;
860 static char *out_buffer = NULL; 860 static char *out_buffer = NULL;
861 static size_t out_len; 861 static size_t out_len;
862 862
863 found_pax = found_phdr = found_relro = found_load = found_textrel = \ 863 found_pax = found_phdr = found_relro = found_load = found_textrel = \
864 found_rpath = found_needed = found_interp = found_bind = found_soname = \ 864 found_rpath = found_needed = found_interp = found_bind = found_soname = \
865 found_sym = found_lib = found_file = found_textrels = 0; 865 found_sym = found_lib = found_file = found_textrels = 0;
866 866
867 /* verify this is real ELF */
868 if ((elf = _readelf(filename, !fix_elf)) == NULL) {
869 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
870 return 1;
871 }
872
873 if (be_verbose > 1) 867 if (be_verbose > 1)
874 printf("%s: scanning file {%s,%s}\n", filename, 868 printf("%s: scanning file {%s,%s}\n", elf->filename,
875 get_elfeitype(EI_CLASS, elf->elf_class), 869 get_elfeitype(EI_CLASS, elf->elf_class),
876 get_elfeitype(EI_DATA, elf->data[EI_DATA])); 870 get_elfeitype(EI_DATA, elf->data[EI_DATA]));
877 else if (be_verbose) 871 else if (be_verbose)
878 printf("%s: scanning file\n", filename); 872 printf("%s: scanning file\n", elf->filename);
879 873
880 /* init output buffer */ 874 /* init output buffer */
881 if (!out_buffer) { 875 if (!out_buffer) {
882 out_len = sizeof(char) * 80; 876 out_len = sizeof(char) * 80;
883 out_buffer = (char*)xmalloc(out_len); 877 out_buffer = (char*)xmalloc(out_len);
… …
937 case '#': 931 case '#':
938 xchrcat(&out_buffer, out_format[i], &out_len); break; 932 xchrcat(&out_buffer, out_format[i], &out_len); break;
939 case 'F': 933 case 'F':
940 found_file = 1; 934 found_file = 1;
941 if (be_wewy_wewy_quiet) break; 935 if (be_wewy_wewy_quiet) break;
942 xstrcat(&out_buffer, filename, &out_len); 936 xstrcat(&out_buffer, elf->filename, &out_len);
943 break; 937 break;
944 case 'p': 938 case 'p':
945 found_file = 1; 939 found_file = 1;
946 if (be_wewy_wewy_quiet) break; 940 if (be_wewy_wewy_quiet) break;
947 tmp = filename; 941 tmp = elf->filename;
948 if (search_path) { 942 if (search_path) {
949 ssize_t len_search = strlen(search_path); 943 ssize_t len_search = strlen(search_path);
950 ssize_t len_file = strlen(filename); 944 ssize_t len_file = strlen(elf->filename);
951 if (!strncmp(filename, search_path, len_search) && \ 945 if (!strncmp(elf->filename, search_path, len_search) && \
952 len_file > len_search) 946 len_file > len_search)
953 tmp += len_search; 947 tmp += len_search;
954 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++; 948 if (*tmp == '/' && search_path[len_search-1] == '/') tmp++;
955 } 949 }
956 xstrcat(&out_buffer, tmp, &out_len); 950 xstrcat(&out_buffer, tmp, &out_len);
957 break; 951 break;
958 case 'f': 952 case 'f':
959 found_file = 1; 953 found_file = 1;
960 if (be_wewy_wewy_quiet) break; 954 if (be_wewy_wewy_quiet) break;
961 tmp = strrchr(filename, '/'); 955 tmp = strrchr(elf->filename, '/');
962 tmp = (tmp == NULL ? filename : tmp+1); 956 tmp = (tmp == NULL ? elf->filename : tmp+1);
963 xstrcat(&out_buffer, tmp, &out_len); 957 xstrcat(&out_buffer, tmp, &out_len);
964 break; 958 break;
965 case 'o': out = get_elfetype(elf); break; 959 case 'o': out = get_elfetype(elf); break;
966 case 'x': out = scanelf_file_pax(elf, &found_pax); break; 960 case 'x': out = scanelf_file_pax(elf, &found_pax); break;
967 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break; 961 case 'e': out = scanelf_file_phdr(elf, &found_phdr, &found_relro, &found_load); break;
… …
990 found_rpath || found_needed || found_interp || found_bind || \ 984 found_rpath || found_needed || found_interp || found_bind || \
991 found_soname || found_sym || found_lib || found_textrels) 985 found_soname || found_sym || found_lib || found_textrels)
992 986
993 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) { 987 if (!found_file && (!be_quiet || (be_quiet && FOUND_SOMETHING()))) {
994 xchrcat(&out_buffer, ' ', &out_len); 988 xchrcat(&out_buffer, ' ', &out_len);
995 xstrcat(&out_buffer, filename, &out_len); 989 xstrcat(&out_buffer, elf->filename, &out_len);
996 } 990 }
997 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) { 991 if (!be_quiet || (be_quiet && FOUND_SOMETHING())) {
998 puts(out_buffer); 992 puts(out_buffer);
999 fflush(stdout); 993 fflush(stdout);
1000 } 994 }
1001 995
996 return 0;
997}
998
999/* scan a single elf */
1000static int scanelf_elf(const char *filename, int fd, size_t len)
1001{
1002 int ret;
1003 elfobj *elf;
1004
1005 /* verify this is real ELF */
1006 if ((elf = _readelf_fd(filename, fd, len, !fix_elf)) == NULL) {
1007 if (be_verbose > 2) printf("%s: not an ELF\n", filename);
1008 return 1;
1009 }
1010
1011 ret = scanelf_elfobj(elf);
1002 unreadelf(elf); 1012 unreadelf(elf);
1013 return ret;
1014}
1015/* scan an archive of elfs */
1016static int scanelf_archive(const char *filename, int fd, size_t len)
1017{
1018 archive_handle *ar;
1019 archive_member *m;
1020 char *ar_buffer;
1021 elfobj *elf;
1022
1023 ar = ar_open_fd(filename, fd);
1024 if (ar == NULL)
1025 return 1;
1026
1027 ar_buffer = (char*)mmap(0, len, PROT_READ | (fix_elf ? PROT_WRITE : 0), (fix_elf ? MAP_SHARED : MAP_PRIVATE), fd, 0);
1028 while ((m=ar_next(ar)) != NULL) {
1029 elf = readelf_buffer(m->name, ar_buffer+lseek(fd,0,SEEK_CUR), m->size);
1030 if (elf) {
1031 scanelf_elfobj(elf);
1032 unreadelf(elf);
1033 }
1034 }
1035 munmap(ar_buffer, len);
1003 1036
1004 return 0; 1037 return 0;
1005} 1038}
1006
1007/* scan an archive of elfs */
1008static int scanelf_archive(const char *filename)
1009{
1010 archive_handle *ar = ar_open(filename);
1011 archive_member *m;
1012 while ((m=ar_next(ar)) != NULL)
1013 printf("%o %i:%i %s\n", m->mode, m->uid, m->gid, m->name);
1014 return 0;
1015}
1016
1017/* scan a file which may be an elf or an archive or some other magical beast */ 1039/* scan a file which may be an elf or an archive or some other magical beast */
1018static void scanelf_file(const char *filename) 1040static void scanelf_file(const char *filename)
1019{ 1041{
1020 struct stat st; 1042 struct stat st;
1043 int fd;
1021 1044
1022 /* make sure 'filename' exists */ 1045 /* make sure 'filename' exists */
1023 if (lstat(filename, &st) == -1) { 1046 if (lstat(filename, &st) == -1) {
1024 if (be_verbose > 2) printf("%s: does not exist\n", filename); 1047 if (be_verbose > 2) printf("%s: does not exist\n", filename);
1025 return; 1048 return;
… …
1033 if (!S_ISREG(st.st_mode)) { 1056 if (!S_ISREG(st.st_mode)) {
1034 if (be_verbose > 2) printf("%s: skipping non-file\n", filename); 1057 if (be_verbose > 2) printf("%s: skipping non-file\n", filename);
1035 return; 1058 return;
1036 } 1059 }
1037 1060
1061 if ((fd=open(filename, (fix_elf ? O_RDWR : O_RDONLY))) == -1)
1062 return;
1063
1038 if (scanelf_elf(filename) == 1 && scan_archives) 1064 if (scanelf_elf(filename, fd, st.st_size) == 1 && scan_archives)
1039 /* if it isn't an ELF, maybe it's an .a archive */ 1065 /* if it isn't an ELF, maybe it's an .a archive */
1040 scanelf_archive(filename); 1066 scanelf_archive(filename, fd, st.st_size);
1067
1068 close(fd);
1041} 1069}
1042 1070
1043/* scan a directory for ET_EXEC files and print when we find one */ 1071/* scan a directory for ET_EXEC files and print when we find one */
1044static void scanelf_dir(const char *path) 1072static void scanelf_dir(const char *path)
1045{ 1073{
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