jacob.windle
/
hb
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity

Merge branch 'feature/delete-host' of jacob.windle/hb into master

master
Jacob Windle 2020-01-17 13:24:26 +00:00 committed by Gitea
parent ccb0e90d3b 31186418c3
commit 76feb40f1a
1 changed files with 61 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

129
main.c
View File

@ -14,13 +14,6 @@
#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.
* TODO: Generalized routine for reading through a file and replacing a line.
* TODO: Generalized routine for reading a file.
*/
/** GLOBALS **/
// Our rule we use to blackhole domains
const char *blockString = "0.0.0.0 ";
@ -32,9 +25,6 @@ static char *HOSTFILE = "/etc/hosts";
static char *CONFIG;
// Our configuration
void replacehost(char *oldhost, char *newhost);
/**
* Return an open handle to the hosts file.
*
@ -46,6 +36,53 @@ FILE *fopenHostsFile(char *mode)
return fopen(HOSTFILE, mode);
}
/**
* Replace a host in the hosts file with the NEW host.
*
* @param oldhost
* @param newhost
* @param hostsFile
*/
void modifyHostsFile(char *oldhost, char *newhost, int deleteHost) {
FILE *hostsFile = fopenHostsFile("r");
char buf[256];
char *ptr, *f;
char newHostsFile[4096];
memset(newHostsFile, 0, 4096);
// fseek(hostsFile, 0, SEEK_SET);
while (fgets(buf, 256, hostsFile) != NULL)
{
f = strcasestr(buf, oldhost);
if (f != NULL) {
// Just skip writing this host to the hosts file if we are deleting it
if (deleteHost)
continue;
memset(buf, 0, sizeof(buf));
sprintf(buf, "%s %s\n", blockString, newhost);
}
strcat(newHostsFile, buf);
memset(buf, 0, sizeof(buf));
}
// Ensure we have an EOF at the end of the file.
newHostsFile[strlen(newHostsFile)] = EOF;
// // Seek to 0
// fseek(hostsFile, 0, SEEK_SET);
fclose(hostsFile);
// If this failed, write an error message to stderr
// ONFAILED(0, (fwrite(newHostsFile, sizeof(char), sizeof(newHostsFile), hostsFile))) {
// fprintf(stderr, "Did not write anything!\n");
// }
fprintf(stderr, "New hosts file: \n%s\n", newHostsFile);
// fclose(hostsFile);
}
/**
* Block a hosts using the hostsFile in FILE
*/
@ -63,9 +100,12 @@ void blockHost(char *host)
fclose(hostsFile);
}
void deleteHost(char *host)
{
void deleteHost(char *host) {
modifyHostsFile(host, NULL, 1);
}
void replaceHost(char *oldhost, char *newhost) {
modifyHostsFile(oldhost, newhost, 0);
}
void showHosts()
@ -115,7 +155,7 @@ int update_hosts_file() {
return 0;
}
}
replacehost(ptr->data, buf);
replaceHost(ptr->data, buf);
strcpy(ptr->data, buf);
prev = ptr;
ptr = ptr->next;
@ -199,11 +239,9 @@ int main(int argc, char **argv)
}
// Process our command line arguments.
for (int i = 0; i < argc; i++)
{
for (int i = 0; i < argc; i++) {
// Opens a hosts file in append mode, adding a host.
if (ARG_IS("add"))
{
if (ARG_IS("add")) {
if (argc < 3) {
printf("Please provide a host!\n");
exit(1);
@ -211,25 +249,21 @@ int main(int argc, char **argv)
blockHost(argv[++i]);
}
// Replaces a host
else if (ARG_IS("edit"))
{
replacehost(argv[i + 1], argv[i + 2]);
else if (ARG_IS("edit")) {
replaceHost(argv[i + 1], argv[i + 2]);
i += 2;
}
// Deletes a host.
else if (ARG_IS("delete"))
{
fprintf(stdout, "Soon to be implemented!\n");
else if (ARG_IS("delete")) {
deleteHost(argv[i+1]);
}
// Shows usage.
else if (ARG_IS("-h"))
{
else if (ARG_IS("-h")) {
usage();
exit(0);
}
// Show the entire hosts file.
else if (ARG_IS("show"))
{
else if (ARG_IS("show")) {
showHosts();
}
else if (ARG_IS("-config")) {
@ -251,45 +285,4 @@ int main(int argc, char **argv)
free_list(&hosts);
}
/**
* Replace a host in the hosts file with the NEW host.
*
* @param oldhost
* @param newhost
* @param hostsFile
*/
void replacehost(char *oldhost, char *newhost) {
FILE *hostsFile = fopenHostsFile("r");
char buf[256];
char *ptr, *f;
char newHostsFile[4096];
memset(newHostsFile, 0, 4096);
// fseek(hostsFile, 0, SEEK_SET);
while (fgets(buf, 256, hostsFile) != NULL)
{
f = strcasestr(buf, oldhost);
if (f != NULL) {
memset(buf, 0, sizeof(buf));
sprintf(buf, "%s %s\n", blockString, newhost);
}
strcat(newHostsFile, buf);
memset(buf, 0, sizeof(buf));
}
// Ensure we have an EOF at the end of the file.
newHostsFile[strlen(newHostsFile)] = EOF;
// // Seek to 0
// fseek(hostsFile, 0, SEEK_SET);
fclose(hostsFile);
// If this failed, write an error message to stderr
// ONFAILED(0, (fwrite(newHostsFile, sizeof(char), sizeof(newHostsFile), hostsFile))) {
// fprintf(stderr, "Did not write anything!\n");
// }
fprintf(stderr, "New hosts file: \n%s\n", newHostsFile);
// fclose(hostsFile);
}