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/vnlog-1.30/b64_cencode.c
Examining data/vnlog-1.30/test/test1.c
Examining data/vnlog-1.30/test/test2.c
Examining data/vnlog-1.30/vnlog-base64.h
Examining data/vnlog-1.30/vnlog.c
Examining data/vnlog-1.30/vnlog.h

FINAL RESULTS:

data/vnlog-1.30/vnlog.c:106:5:  [4] (format) vfprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
    vfprintf(ctx->root->_fp, fmt, ap);
data/vnlog-1.30/vnlog.c:224:9:  [4] (format) snprintf:
  If format strings can be influenced by an attacker, they can be exploited,
  and note that sprintf variations do not always \0-terminate (CWE-134). Use
  a constant for the format specification.
        snprintf(ctx->fields[idx].c, sizeof(ctx->fields[0].c), fmt, arg) ) \
data/vnlog-1.30/test/test2.c:8:16:  [2] (misc) fopen:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
    FILE* fp = fopen("test2.got", "w");
data/vnlog-1.30/vnlog.c:87:9:  [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 out_base64[vnlog_base64_dstlen_to_encode(ctx->fields[i].binlen)];
data/vnlog-1.30/vnlog.c:247:5:  [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(ctx->fields[idx].binptr, data, len);
data/vnlog-1.30/vnlog.h:89:5:  [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  c[VNLOG_MAX_FIELD_LEN];
data/vnlog-1.30/test/test1.c:19:35:  [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).
    vnlog_set_field_value__d(str, strlen(str));

ANALYSIS SUMMARY:

Hits = 7
Lines analyzed = 900 in approximately 0.05 seconds (16445 lines/second)
Physical Source Lines of Code (SLOC) = 460
Hits@level = [0]   2 [1]   1 [2]   4 [3]   0 [4]   2 [5]   0
Hits@level+ = [0+]   9 [1+]   7 [2+]   6 [3+]   2 [4+]   2 [5+]   0
Hits/KSLOC@level+ = [0+] 19.5652 [1+] 15.2174 [2+] 13.0435 [3+] 4.34783 [4+] 4.34783 [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.