fcgi/man.c at main · hamkee-dev-group/fcgi · GitHub

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#include <fcgiapp.h>
#include <fcgios.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/utsname.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <pwd.h>

int showMan(FCGX_Request *req, char *manpage, char *section)
{
  FILE *fp;
  char fline[512];
  char comm[strlen(manpage) + 3 + 4];
  memset(comm, 0, strlen(manpage) + 3 + 4);
  memcpy(comm, "man ", 4);
  if (section != NULL)
  {
    strncat(comm, section, strlen(section));
    strncat(comm, " ", 1);
  }
  strncat(comm, manpage, strlen(manpage));
  fp = popen(comm, "r");
  if (fp == NULL)
  {
    return 0;
  }

  while (fgets(fline, 511, fp) != NULL)
  {
    fline[511] = '\0';
    FCGX_FPrintF(req->out, "%s", fline);
    memset(fline, 0, 512);
  }
  FCGX_FPrintF(req->out, "\r\n");
  pclose(fp);
  return 1;
}

int showApropos(FCGX_Request *req, char *section)
{
  FILE *fp;
  char fline[512];
  char name[64];
  char comm[17];
  char *c;
  int idx;
  memset(fline, 0, 512 * sizeof(char));
  memset(name, 0, 512 * sizeof(char));
  memset(comm, 0, 512 * sizeof(char));

  memcpy(comm, "apropos -s ", 12);
  strncat(comm, section, strlen(section));
  strncat(comm, " .", 2);
  fp = popen(comm, "r");
  if (fp == NULL)
  {
    return 0;
  }
  FCGX_FPrintF(req->out, "<pre>");

  while (fgets(fline, 511, fp) != NULL)
  {
    fline[511] = '\0';
    c = strchr(fline, '(');
    idx = (int)(c - fline);
    strncpy(name, fline, idx);
    name[idx - 1] = '\0';
    c = strchr(fline, ')');
    FCGX_FPrintF(req->out, "<a href=\"https://hamkee.net/man?%s&%s\" style=\"text-decoration:none;color:black\">%s</a>", name, section, fline);
    memset(fline, 0, 512);
    memset(name, 0, 64);
  }
  FCGX_FPrintF(req->out, "</pre>\r\n");
  pclose(fp);
  return 1;
}

int main(void)
{
  char *param;
  char *c;
  char sec[3];
  int idx;
  int sockfd;
  FCGX_Request req;
  struct passwd *p;

  sockfd = FCGX_OpenSocket("/var/www/fcgi-man.sock", 512);
  if (sockfd == -1)
  {
    perror("FCGX_OpenSocket");
    return 0;
  }
  p = getpwnam("nginx");
  if (p == NULL)
  {
    write(STDERR_FILENO, "getpwmam\n", 9);
    return 0;
  }
  if (chmod("/var/www/fcgi-man.sock", 664) != 0)
  {
    perror("chmod");
    return 0;
  }
  if (chown("/var/www/fcgi-man.sock", p->pw_uid, p->pw_gid) != 0)
  {
    perror("chown");
    return 0;
  }
  if (FCGX_Init() != 0)
  {
    write(STDERR_FILENO, "FCGX_Init\n", 10);
    return 0;
  }
  memset(&req, 0, sizeof(FCGX_Request));

  FCGX_InitRequest(&req, sockfd, 0);

  while (FCGX_Accept_r(&req) >= 0)
  {
    memset(sec, 0, 3);
    param = FCGX_GetParam("QUERY_STRING", req.envp);
    if (strlen(param) == 0)
    {
      FCGX_FPrintF(req.out, "Content-Type: text/html\r\n\r\n");
      FCGX_FPrintF(req.out, "<!DOCTYPE html><html lang=\"en\"><body>\r\n");
      showApropos(&req, "2");
      showApropos(&req, "3");
      showApropos(&req, "3p");
      FCGX_FPrintF(req.out, "</body></html>r\n");
    }
    else
    {
      FCGX_FPrintF(req.out, "Content-Type: text/plain\r\n\r\n");
      c = strchr(param, '&');
      if (c == NULL)
        showMan(&req, param, NULL);
      else
      {
        idx = (int)(c - param) + 1;
        for (int i = 0; i < 3; i++)
        {
          sec[i] = param[idx + i];
        }
        param[idx - 1] = '\0';
        showMan(&req, param, sec);
      }
    }
    FCGX_Finish_r(&req);
  }
  FCGX_Free(&req, sockfd);
  OS_LibShutdown();
  return 0;
}