32 lines
949 B
C
32 lines
949 B
C
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/* Google Talk Plugin executes a helper program in /opt. This
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LD_PRELOAD library intercepts execvp() calls to redirect them to
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the corresponding location in $out. */
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <limits.h>
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char origDir [] = "/opt/google/talkplugin/GoogleTalkPlugin";
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char realDir [] = OUT "/libexec/google/talkplugin/GoogleTalkPlugin";
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const char * rewrite(const char * path, char * buf)
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{
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if (strncmp(path, origDir, sizeof(origDir) - 1) != 0) return path;
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if (snprintf(buf, PATH_MAX, "%s%s", realDir, path + sizeof(origDir) - 1) >= PATH_MAX)
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abort();
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return buf;
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}
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int execvp(const char * path, char * const argv[])
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{
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int (*_execvp) (const char *, char * const argv[]) = dlsym(RTLD_NEXT, "execvp");
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char buf[PATH_MAX];
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return _execvp(rewrite(path, buf), argv);
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}
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