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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void usage(const char *name, const char *message)
{
fprintf(
stderr,
"usage: %1$s proxy command [arg [arg [...]]]\n"
" the proxy parameter may be set to '-' so no proxy will be used\n"
"%1$s: %2$s\n",
name, message
);
exit(1);
}
size_t get_envname(char *dest, const char *var)
{
size_t i = 0;
while ((dest[i] = tolower(var[i])) != '=') ++i;
dest[i] = '\0';
return i;
}
int main(int argc, char **argv, char **env)
{
char envname[128];
if (argc < 2)
usage(argv[0], "no proxy was specified");
else if (argc < 3)
usage(argv[0], "no command was specified");
for (char **envp = env; *envp != NULL; ++envp, get_envname(envname, *envp))
if (strstr(envname, "_proxy"))
unsetenv(envname);
if (strcmp(argv[1], "-"))
setenv("all_proxy", argv[1], 1);
return execvp(argv[2], &argv[2]);
}
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