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/netsed-1.2/netsed.c

FINAL RESULTS:

data/netsed-1.2/netsed.c:134:19:  [4] (format) fprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
#define ERR(x...) fprintf(stderr,x)
data/netsed-1.2/netsed.c:140:19:  [4] (format) printf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
#define DBG(x...) printf(x)
data/netsed-1.2/netsed.c:473:15:  [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 ((i = getopt_long(argc, argv, "46h", long_options, NULL)) != -1)
data/netsed-1.2/netsed.c:475:15:  [3] (buffer) getopt:
  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 ((i = getopt(argc, argv, "46h")) != -1)
data/netsed-1.2/netsed.c:533:24:  [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).
      rule_live[rules]=atoi(cs); else rule_live[rules]=-1;
data/netsed-1.2/netsed.c:597:1:  [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[MAX_BUF];
data/netsed-1.2/netsed.c:599:1:  [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 b2[MAX_BUF];
data/netsed-1.2/netsed.c:621:9:  [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(&b2[newsize],rule[j].to,rule[j].ts);
data/netsed-1.2/netsed.c:746:7:  [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(&fixedhost, res->ai_addr, res->ai_addrlen);
data/netsed-1.2/netsed.c:779:5:  [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 ipstr[INET6_ADDRSTRLEN], portstr[12];
data/netsed-1.2/netsed.c:881:11:  [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(conn->csa, &s, l);
data/netsed-1.2/netsed.c:890:9:  [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(conn->live, rule_live, rules*sizeof(int));
data/netsed-1.2/netsed.c:394:18:  [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).
  r->from=malloc(strlen(r->forig));
data/netsed-1.2/netsed.c:395:16:  [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).
  r->to=malloc(strlen(r->torig));
data/netsed-1.2/netsed.c:398:14:  [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).
  for (i=0;i<strlen(r->forig);i++) {
data/netsed-1.2/netsed.c:427:14:  [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).
  for (i=0;i<strlen(r->torig);i++) {
data/netsed-1.2/netsed.c:649:8:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
    rd=read(conn->fsock,buf,sizeof(buf));
data/netsed-1.2/netsed.c:676:8:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
    rd=read(conn->csock,buf,sizeof(buf));

ANALYSIS SUMMARY:

Hits = 18
Lines analyzed = 970 in approximately 0.04 seconds (26715 lines/second)
Physical Source Lines of Code (SLOC) = 640
Hits@level = [0]  20 [1]   6 [2]   8 [3]   2 [4]   2 [5]   0
Hits@level+ = [0+]  38 [1+]  18 [2+]  12 [3+]   4 [4+]   2 [5+]   0
Hits/KSLOC@level+ = [0+] 59.375 [1+] 28.125 [2+] 18.75 [3+] 6.25 [4+] 3.125 [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.