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/*
* trickle.c
*
* Copyright (c) 2002, 2003 Marius Aamodt Eriksen <marius@monkey.org>
* All rights reserved.
*
* $Id: trickle.c,v 1.18 2004/02/13 06:13:05 marius Exp $
*/
#include <sys/types.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <sys/param.h>
#include <sys/stat.h>
#ifdef HAVE_ERR_H
#include <err.h>
#endif /* HAVE_ERR_H */
#include <errno.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "util.h"
size_t strlcat(char *, const char *, size_t);
void usage(void);
#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif
#define LIBNAME "trickle-overload.so"
int
main(int argc, char **argv)
{
char *winsz = "200", verbosestr[16],
*uplim = "10", *downlim = "10", *tsmooth = "3.0", *lsmooth = "20",
*latency = "0";
int opt, verbose = 0, standalone = 0;
char buf[MAXPATHLEN], sockname[MAXPATHLEN], **pathp;
struct stat sb;
char *path = LIBDIR "/" LIBNAME;
__progname = get_progname(argv[0]);
sockname[0] = '\0';
while ((opt = getopt(argc, argv, "hvVsw:n:u:d:t:l:L:P:")) != -1)
switch (opt) {
case 'v':
verbose++;
break;
case 'w':
winsz = optarg;
break;
case 'u':
uplim = optarg;
break;
case 'd':
downlim = optarg;
break;
case 'V':
errx(1, "version " VERSION);
break;
case 'n':
strlcpy(sockname, optarg, sizeof(sockname));
break;
case 't':
tsmooth = optarg;
break;
case 'l':
lsmooth = optarg;
break;
case 's':
standalone = 1;
break;
case 'P':
path = optarg;
break;
case 'L':
latency = optarg;
break;
case 'h':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
if (lstat(path, &sb) != 0) {
errx(1, "Could not find overload object");
}
if (path[0] != '/') {
if (getcwd(buf, sizeof(buf)) == NULL)
errx(1, "getcwd");
strlcat(buf, "/", sizeof(buf));
strlcat(buf, path, sizeof(buf));
path = buf;
}
if (!standalone) {
if (sockname[0] == '\0')
strlcpy(sockname, "/tmp/.trickled.sock",
sizeof(sockname));
if (stat(sockname, &sb) == -1 &&
(errno == EACCES || errno == ENOENT))
warn("Could not reach trickled, working independently");
} else
strlcpy(sockname, "", sizeof(sockname));
snprintf(verbosestr, sizeof(verbosestr), "%d", verbose);
setenv("TRICKLE_DOWNLOAD_LIMIT", downlim, 1);
setenv("TRICKLE_UPLOAD_LIMIT", uplim, 1);
setenv("TRICKLE_VERBOSE", verbosestr, 1);
setenv("TRICKLE_WINDOW_SIZE", winsz, 1);
setenv("TRICKLE_ARGV", argv[0], 1);
setenv("TRICKLE_SOCKNAME", sockname, 1);
setenv("TRICKLE_TSMOOTH", tsmooth, 1);
setenv("TRICKLE_LSMOOTH", lsmooth, 1);
/* setenv("TRICKLE_LATENCY", latency, 1); */
setenv("LD_PRELOAD", path, 1);
execvp(argv[0], argv);
err(1, "exec()");
/* NOTREACHED */
return (1);
}
void
usage(void)
{
fprintf(stderr,
"Usage: %s [-hvVs] [-d <rate>] [-u <rate>] [-w <length>] "
"[-t <seconds>]\n"
" %*c [-l <length>] [-n <path>] command ...\n"
"\t-h Help (this)\n"
"\t-v Increase verbosity level\n"
"\t-V Print %s version\n"
"\t-s Run trickle in standalone mode independent of trickled\n"
"\t-d <rate> Set maximum cumulative download rate to <rate> KB/s\n"
"\t-u <rate> Set maximum cumulative upload rate to <rate> KB/s\n"
"\t-w <length> Set window length to <length> KB \n"
"\t-t <seconds> Set default smoothing time to <seconds> s\n"
"\t-l <length> Set default smoothing length to <length> KB\n"
"\t-n <path> Use trickled socket name <path>\n"
"\t-L <ms> Set latency to <ms> milliseconds\n"
"\t-P <path> Preload the specified .so instead of the default one\n",
__progname, (int)strlen(__progname), ' ', __progname);
exit(1);
}
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