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Macro for command line argument handling

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This commit is contained in:
Jacob Windle 2020-01-13 12:24:31 -05:00
parent e5f4dd5637
commit bdca3cf572
1 changed files with 17 additions and 31 deletions
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46
main.c
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@ -12,6 +12,8 @@
// Macro for status checks.
#define ONFAILED(status, fn) if(status > fn)
#define ARG_IS(argname) (strcmp(argv[i], argname) == 0)
/**
* TODO: Add config file reading for daemonization.
* TODO: Allow daemonized process to call file reading/editing routines at will.
@ -23,6 +25,7 @@
// Our rule we use to blackhole domains
const char *blockString = "0.0.0.0 ";
LinkedList *hosts = NULL;
int HB_PERIOD = 60;
// The current hardcoded location of the hosts file.
static char *HOSTFILE = "/etc/hosts";
@ -131,7 +134,7 @@ int read_config_file() {
// overwrite data in these nodes.
if (ptr != NULL && strcmp(buf, ptr->data) != 0) {
if (strlen(ptr->data) < strlen(buf)) {
if ((ptr->data = realloc(ptr->data, strlen(buf))) < 0) {
if ((ptr->data = realloc(ptr->data, strlen(buf))) == NULL) {
fprintf(stderr, "Failed to realloc pointer\n");
exit(1);
}
@ -146,32 +149,12 @@ int read_config_file() {
}
/**
* Daemonize the process, to be run like this ONLY if there were no arguments
* provided.
*
* TODO:
* read the config file.
* Wake up on SIGALRM to do our thing.
*/
void daemonize() {
pid_t mypid = fork();
if (mypid != 0) {
// I am the parent, kill myself
fprintf(stderr, "Parent exiting");
exit(1);
}
else {
// DO THE THING.
while(1) {
// read config
void run_loop(int signal) {
read_config_file();
break;
// make adjustments
// profit??
// JK, sleep.
}
}
alarm(HB_PERIOD);
}
/**
@ -189,7 +172,7 @@ int main(int argc, char **argv)
for (int i = 0; i < argc; i++)
{
// Opens a hosts file in append mode, adding a host.
if (strcmp(argv[i], "add") == 0)
if (ARG_IS("add"))
{
if (argc < 3) {
printf("Please provide a host!\n");
@ -199,30 +182,33 @@ int main(int argc, char **argv)
}
// Replaces a host
// TODO: this currently duplicates the whole file and appends it to the end.
else if (strcmp(argv[i], "edit") == 0)
else if (ARG_IS("edit"))
{
replacehost(argv[++i], argv[++i]);
}
// Deletes a host.
else if (strcmp(argv[i], "delete") == 0)
else if (ARG_IS("delete"))
{
fprintf(stdout, "Soon to be implemented!\n");
}
// Shows usage.
else if (strcmp(argv[i], "-h") == 0)
else if (ARG_IS("-h"))
{
usage();
exit(0);
}
// Show the entire hosts file.
else if (strcmp(argv[i], "show") == 0)
else if (ARG_IS("show"))
{
showHosts();
}
else if (strcmp(argv[i], "-config") == 0) {
else if (ARG_IS("-config")) {
CONFIG = argv[++i];
read_config_file();
}
else if (ARG_IS("-period")) {
HB_PERIOD = atoi(argv[++i]);
}
// Daemonize this process, allowing for hosts file to be automagically managed.
else {