Hacky DMARC parse validator using opendmarc's parser. Derived from opendmarc-1.3.2/libopendmarc/tests/test_dmarc_parse.c

README.md

dmarc_parse_validator

Running this hacky program

wget https://sourceforge.net/projects/opendmarc/files/latest/download
tar zxvf opendmarc-1.3.2.tar.gz 
cd opendmarc-1.3.2/
./configure && make
cd libopendmarc/
# create compile_dmarc_parse_validator.sh and chmod 755 compile_dmarc_parse_validator.sh
# create dmarc_parse_validator.c
./compile_dmarc_parse_validator.sh

# run it
./tests/dmarc_parse_validator ~/dmarc-records.txt

Example of what is expected:

head -n 3 ~/dmarc-records.txt 
v=DMARC1; p=reject; rua=mailto:[email protected]
v=DMARC1; p=reject; rua=mailto:[email protected]
v=DMARC1; p=quarantine; rua=mailto:[email protected]

compile_dmarc_parse_validator.sh

#!/bin/bash

# tests/dmarc_parse_validator.c
gcc -DHAVE_CONFIG_H -I. -I.. -I. -I.. -DCONFIG_BASE=\"/usr/local/etc\" -g -O2 -MT opendmarc_policy.lo -MD -MP -c tests/dmarc_parse_validator.c  -fPIC -DPIC -o tests/dmarc_parse_validator.o
gcc -DHAVE_CONFIG_H -I. -I.. -I. -I.. -DCONFIG_BASE=\"/usr/local/etc\" -g -O2 -MT -MD -MP -fPIC -DPIC *.o tests/dmarc_parse_validator.o -o tests/dmarc_parse_validator -lresolv

dmarc_parse_validator.c

#include "../opendmarc_internal.h"
#ifndef OPENDMARC_POLICY_C
# define OPENDMARC_POLICY_C
#endif /* ! OPENDMARC_POLICY_C */
#include "../dmarc.h"

int
main(int argc, char **argv)
{
    char * line = NULL;
    size_t len = 0;
    ssize_t read;
    FILE *fp;
    fp = fopen(argv[1], "r");
    if (fp == NULL) {
        exit(EXIT_FAILURE);
    }    

    int     pass, fails, count;
    DMARC_POLICY_T *pctx;
    OPENDMARC_STATUS_T status;
    pass = fails = count = 0;

    while ((read = getline(&line, &len, fp)) != -1) {
        count += 1;
        pctx = opendmarc_policy_connect_init("1.2.3.4", 0);
        if (pctx == NULL){
            (void) fprintf(stderr, "opendmarc_policy_connect_init: %s\n", strerror(errno));
            return 1;
        }

        char *pos;
        if ((pos=strchr(line, '\n')) != NULL) {
            *pos = '\0';
        }

        printf("TRYING:'%s'\n", line);
        fflush(stdout);

        status = opendmarc_policy_parse_dmarc(pctx, "abuse.net", line);
        printf("%d\t'%s'\n", status, line);
        fflush(stdout);
        if (status == 0) {
            pass += 1;
        }
        else {
            fails += 1;
        }
        pctx = opendmarc_policy_connect_shutdown(pctx);
    }

    fclose(fp);
    if (line) {
        free(line);
    }
    printf("DMARC Policy Parse: pass=%d, fail=%d\n", pass, fails);
    return 0;
}

harness.py

#!/usr/bin/env python3

'''
opendmarc segfaults on some input.  
this allows me to get through as many examples as possible and ignores the segfaults.
obviously not ideal, but good enough for a one time run for some research.

reported the issue here https://github.com/trusteddomainproject/OpenDMARC/issues/62

'''

import sys
import os

for line in open(sys.argv[1], 'r'):
    line = line.rstrip('\n\r')
    with open('/tmp/test.dat', 'w') as outf:
        print(line, file=outf)
    os.system('./tests/dmarc_parse_validator /tmp/test.dat >> /tmp/results.txt')