Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/redir-3.3/redir.c

FINAL RESULTS:

data/redir-3.3/redir.c:671:2:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
	sprintf((char *)&buf, "CONNECT %s HTTP/1.0\n\n", connect_str);
data/redir-3.3/redir.c:295:16:  [3] (buffer) getopt_long:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
	while ((opt = getopt_long(argc, argv, "b:hiI:l:npst:vx:" FTP_OPTS SHAPER_OPTS, long_options, NULL)) != -1) {
data/redir-3.3/redir.c:874:3:  [3] (random) srand:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
		srand(getpid());
data/redir-3.3/redir.c:196:9:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
	return atoi(level);
data/redir-3.3/redir.c:208:10:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
		port = atoi(arg);
data/redir-3.3/redir.c:281:2:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
	char src[INET6_ADDRSTRLEN] = "", dst[INET6_ADDRSTRLEN] = "";
data/redir-3.3/redir.c:341:14:  [2] (integer) atol:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			timeout = atol(optarg);
data/redir-3.3/redir.c:346:20:  [2] (integer) atol:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			max_bandwidth = atol(optarg);
data/redir-3.3/redir.c:350:18:  [2] (integer) atol:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			wait_in_out = atol(optarg);
data/redir-3.3/redir.c:356:18:  [2] (integer) atol:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			random_wait = atol(optarg);
data/redir-3.3/redir.c:360:28:  [2] (integer) atol:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
			bufsize = (unsigned int)atol(optarg);
data/redir-3.3/redir.c:517:14:  [2] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf. Risk is low because the source has a constant maximum length.
		(*bytes) = sprintf(buf, "PORT %d,%d,%d,%d,%d,%d\n",
data/redir-3.3/redir.c:524:14:  [2] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf. Risk is low because the source has a constant maximum length.
		(*bytes) = sprintf(buf, "227 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\n",
data/redir-3.3/redir.c:668:2:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
	char buf[128];
data/redir-3.3/redir.c:724:3:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
		memcpy(&target->sin_addr, hp->h_addr, hp->h_length);
data/redir-3.3/redir.c:756:3:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
		memcpy(&addr_out, &peer, sizeof(struct sockaddr_in));
data/redir-3.3/redir.c:772:3:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
		memcpy(&addr_out.sin_addr, hp->h_addr, hp->h_length);
data/redir-3.3/redir.c:930:3:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
		memcpy(&server.sin_addr, hp->h_addr, hp->h_length);
data/redir-3.3/redir.c:412:7:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
		if (strlen(dst) > 1)
data/redir-3.3/redir.c:419:7:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
		if (strlen(src) > 1)
data/redir-3.3/redir.c:423:7:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
		if (strlen(dst) > 1)
data/redir-3.3/redir.c:614:12:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
			bytes = read(insock, buf, bufsize);
data/redir-3.3/redir.c:635:12:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
			bytes = read(outsock, buf, bufsize);
data/redir-3.3/redir.c:672:34:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
	x = write(socket, (char *)&buf, strlen(buf));
data/redir-3.3/redir.c:679:6:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	x = read(socket, (char *)&buf, sizeof(buf));

ANALYSIS SUMMARY:

Hits = 25
Lines analyzed = 1043 in approximately 0.05 seconds (22960 lines/second)
Physical Source Lines of Code (SLOC) = 773
Hits@level = [0]  53 [1]   7 [2]  15 [3]   2 [4]   1 [5]   0
Hits@level+ = [0+]  78 [1+]  25 [2+]  18 [3+]   3 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 100.906 [1+] 32.3415 [2+] 23.2859 [3+] 3.88098 [4+] 1.29366 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.