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95 lines
2.4 KiB
95 lines
2.4 KiB
--- a/lib/decode.c 2013-10-09 09:59:44.000000000 -0700
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+++ b/lib/decode.c 2015-07-20 20:57:58.331945962 -0700
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@@ -21,24 +21,55 @@
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# include <string.h>
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#endif
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+char *
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+safer_name_suffix (char const *file_name)
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+{
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+ char const *p, *t;
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+ p = t = file_name;
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+ while (*p)
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+ {
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+ if (p[0] == '.' && p[0] == p[1] && p[2] == '/')
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+ {
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+ p += 3;
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+ t = p;
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+ }
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+ /* advance pointer past the next slash */
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+ while (*p && (p++)[0] != '/');
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+ }
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+
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+ if (!*t)
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+ {
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+ t = ".";
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+ }
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+
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+ if (t != file_name)
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+ {
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+ /* TODO: warn somehow that the path was modified */
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+ }
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+ return (char*)t;
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+}
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+
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/* determine full path name */
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char *
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th_get_pathname(TAR *t)
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{
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static TLS_THREAD char filename[MAXPATHLEN];
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+ char *safer_name;
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if (t->th_buf.gnu_longname)
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- return t->th_buf.gnu_longname;
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+ return safer_name_suffix(t->th_buf.gnu_longname);
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+
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+ safer_name = safer_name_suffix(t->th_buf.name);
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if (t->th_buf.prefix[0] != '\0')
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{
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snprintf(filename, sizeof(filename), "%.155s/%.100s",
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- t->th_buf.prefix, t->th_buf.name);
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+ t->th_buf.prefix, safer_name);
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return filename;
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}
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- snprintf(filename, sizeof(filename), "%.100s", t->th_buf.name);
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+ snprintf(filename, sizeof(filename), "%.100s", safer_name);
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return filename;
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}
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--- a/lib/extract.c 2013-10-09 09:59:44.000000000 -0700
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+++ b/lib/extract.c 2015-07-20 21:00:16.560956122 -0700
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@@ -305,7 +305,7 @@
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linktgt = &lnp[strlen(lnp) + 1];
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}
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else
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- linktgt = th_get_linkname(t);
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+ linktgt = safer_name_suffix(th_get_linkname(t));
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#ifdef DEBUG
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printf(" ==> extracting: %s (link to %s)\n", filename, linktgt);
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@@ -343,9 +343,9 @@
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#ifdef DEBUG
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printf(" ==> extracting: %s (symlink to %s)\n",
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- filename, th_get_linkname(t));
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+ filename, safer_name_suffix(th_get_linkname(t)));
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#endif
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- if (symlink(th_get_linkname(t), filename) == -1)
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+ if (symlink(safer_name_suffix(th_get_linkname(t)), filename) == -1)
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{
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#ifdef DEBUG
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perror("symlink()");
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--- a/lib/internal.h 2013-10-09 09:59:44.000000000 -0700
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+++ b/lib/internal.h 2015-07-20 21:00:51.258958673 -0700
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@@ -15,6 +15,7 @@
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#include <libtar.h>
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+char* safer_name_suffix(char const*);
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#ifdef TLS
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#define TLS_THREAD TLS
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#else
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