Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mp.h>
#include <libsec.h>

void
usage(void)
{
        fprint(2, "auth/pemdecode section [file]\n");
        exits("usage");
}

void
main(int argc, char **argv)
{
        char *buf;
        uchar *bin;
        int fd;
        long n, tot;
        int len;
        char *tag, *file;

        ARGBEGIN{
        default:
                usage();
        }ARGEND

        if(argc != 1 && argc != 2)
                usage();

        tag = argv[0];
        if(argc == 2)
                file = argv[1];
        else
                file = "#d/0";

        if((fd = open(file, OREAD)) < 0)
                sysfatal("open %s: %r", file);
        buf = nil;
        tot = 0;
        for(;;){
                buf = realloc(buf, tot+8192);
                if(buf == nil)
                        sysfatal("realloc: %r");
                if((n = read(fd, buf+tot, 8192)) < 0)
                        sysfatal("read: %r");
                if(n == 0)
                        break;
                tot += n;
        }
        buf[tot] = 0;
        bin = decodePEM(buf, tag, &len, nil);
        if(bin == nil)
                sysfatal("cannot extract section '%s' from pem", tag);
        if((n=write(1, bin, len)) != len)
                sysfatal("writing %d bytes got %ld: %r", len, n);
        exits(0);
}