133 lines
2.5 KiB
C
133 lines
2.5 KiB
C
#define _GNU_SOURCE
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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/**
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* TODO - daemonize, add in reading of config file,
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* block sites within a certain time limit.
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*/
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const char *blockString = "0.0.0.0 ";
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FILE *fopenHostsFile(int mode)
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{
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switch(mode)
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{
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case 0:
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return fopen("/etc/hosts", "r");
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case 1:
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return fopen("/etc/hosts", "a");
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}
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}
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/**
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* Block a hosts using the hostsFile in FILE
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*/
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void blockHost(FILE *hostsFile, char *host)
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{
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// Buffer to hold our block rule.
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char blockRule[256];
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// Copy the blockstring and host to the blockrule.
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strcpy(blockRule, blockString);
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strcat(blockRule, host);
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strcat(blockRule, "\n");
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// Add a null terminator..
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blockRule[strlen(blockRule)] = 0;
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fputs(blockRule, hostsFile);
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}
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void usage()
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{
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fprintf(stdout, "Usage: ");
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fprintf(stdout, "hb [add] <sitename>\n");
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}
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void showHosts()
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{
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pid_t child = fork();
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int rc = 0;
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char *const parmList[] = {"/bin/cat", "/etc/hosts", NULL};
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if (child == 0)
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{
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execv("/bin/cat", parmList);
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}
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else
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{
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rc = wait(NULL);
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}
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}
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void readToHost(char *host, FILE *hostsFile)
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{
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char buf[256];
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char *ptr, *f;
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while ((ptr = fgets(buf, 256, hostsFile)) != NULL)
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{
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/**
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printf("%s\n", ptr);
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printf("%s\n", host);
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**/
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f = strcasestr(host, ptr);
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if (f != NULL) {
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printf("FOUND IT\n");
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break;
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}
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}
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}
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/**
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* Entrypoint.
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*/
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int main(int argc, char **argv)
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{
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FILE *hostsFile = fopenHostsFile(0);
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readToHost("reddit.com", hostsFile);
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fclose(hostsFile);
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hostsFile = NULL;
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if (getuid() != 0)
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{
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fprintf(stderr, "hb: Must run as root using sudo!\n");
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}
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for (int i = 0; i < argc; i++)
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{
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if (strcmp(argv[i], "add") == 0)
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{
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hostsFile = fopenHostsFile(1);
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blockHost(hostsFile, argv[i+1]);
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}
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else if (strcmp(argv[i], "edit") == 0)
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{
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readToHost(argv[i+1], hostsFile);
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}
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else if (strcmp(argv[i], "delete") == 0)
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{
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fprintf(stdout, "Soon to be implemented!\n");
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}
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else if (strcmp(argv[i], "-h") == 0)
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{
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usage();
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exit(0);
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}
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else if (strcmp(argv[i], "show") == 0)
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{
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showHosts();
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}
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}
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if (hostsFile != NULL)
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fclose(hostsFile);
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}
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