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serve.c
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serve.c
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>
#include <time.h>
#include <fcntl.h>
#define BUFLEN 8192
#define PORT 8000
#define MAX_PROCESSES 100
#define PROCESSES_PER_PAGE 10
// get_usb_info, get_disks
void die(char *s)
{
perror(s);
exit(1);
}
void get_current_datetime(char *buffer, size_t buf_size)
{
// read from /proc/driver/rtc
FILE *fp = fopen("/proc/driver/rtc", "r");
if (fp)
{
char line[256];
while (fgets(line, sizeof(line), fp))
{
if (strstr(line, "rtc_time"))
{
strncat(buffer, "<h2>Current Date and Time: ", buf_size - strlen(buffer) - 1);
strncat(buffer, strchr(line, ':') + 2, buf_size - strlen(buffer) - 1);
strncat(buffer, " ", buf_size - strlen(buffer) - 1);
}
if (strstr(line, "rtc_date"))
{
strncat(buffer, strchr(line, ':') + 2, buf_size - strlen(buffer) - 1);
strncat(buffer, "</h2>", buf_size - strlen(buffer) - 1);
break;
}
}
fclose(fp);
}
else
{
strncat(buffer, "<h3>Current Date and Time: N/A</h3>", buf_size - strlen(buffer) - 1);
}
}
void get_uptime(char *buffer, size_t len)
{
FILE *fp = fopen("/proc/uptime", "r");
if (fp == NULL)
{
strncat(buffer, "N/A", len - strlen(buffer) - 1);
}
else
{
double uptime;
fscanf(fp, "%lf", &uptime);
char temp[256];
snprintf(temp, sizeof(temp), "<h3>Uptime: %.2f seconds</h3>", uptime);
strncat(buffer, temp, len - strlen(buffer) - 1);
fclose(fp);
}
}
void get_processor_info(char *buffer, size_t buf_size)
{
// read from /proc/cpuinfo
FILE *fp = fopen("/proc/cpuinfo", "r");
if (fp)
{
char line[256];
while (fgets(line, sizeof(line), fp))
{
if (strstr(line, "model name"))
{
strncat(buffer, "<h3>Processor: ", buf_size - strlen(buffer) - 1);
strncat(buffer, strchr(line, ':') + 2, buf_size - strlen(buffer) - 1);
strncat(buffer, "</h3>", buf_size - strlen(buffer) - 1);
break;
}
}
fclose(fp);
}
else
{
strncat(buffer, "<h3>Processor: N/A</h3>", buf_size - strlen(buffer) - 1);
}
}
void get_processor_usage(char *buffer, size_t buf_size)
{
FILE *fp;
char line[256];
unsigned long long int user, nice, system, idle, iowait, irq, softirq, steal;
unsigned long long int total, total_idle;
unsigned long long int prev_total = 0, prev_total_idle = 0;
double usage;
// Open /proc/stat file
fp = fopen("/proc/stat", "r");
if (fp == NULL)
{
strncat(buffer, "Error opening /proc/stat", buf_size - strlen(buffer) - 1);
return;
}
// Read the first line (aggregate CPU usage)
if (fgets(line, sizeof(line), fp) == NULL)
{
strncat(buffer, "Error reading /proc/stat", buf_size - strlen(buffer) - 1);
fclose(fp);
return;
}
// Parse the first line
sscanf(line, "cpu %llu %llu %llu %llu %llu %llu %llu %llu",
&user, &nice, &system, &idle, &iowait, &irq, &softirq, &steal);
// Calculate total and total_idle
total = user + nice + system + idle + iowait + irq + softirq + steal;
total_idle = idle + iowait;
// Close the file
fclose(fp);
// Sleep for a short period to get a second reading
usleep(100000); // 100 milliseconds
// Open /proc/stat file again
fp = fopen("/proc/stat", "r");
if (fp == NULL)
{
strncat(buffer, "Error opening /proc/stat", buf_size - strlen(buffer) - 1);
return;
}
// Read the first line (aggregate CPU usage)
if (fgets(line, sizeof(line), fp) == NULL)
{
strncat(buffer, "Error reading /proc/stat", buf_size - strlen(buffer) - 1);
fclose(fp);
return;
}
// Parse the first line
sscanf(line, "cpu %llu %llu %llu %llu %llu %llu %llu %llu",
&user, &nice, &system, &idle, &iowait, &irq, &softirq, &steal);
// Calculate total and total_idle
prev_total = total;
prev_total_idle = total_idle;
total = user + nice + system + idle + iowait + irq + softirq + steal;
total_idle = idle + iowait;
// Close the file
fclose(fp);
// Calculate CPU usage percentage
usage = (1.0 - (double)(total_idle - prev_total_idle) / (total - prev_total)) * 100.0;
// Append the result to the buffer
char temp[256];
snprintf(temp, sizeof(temp), "<h2>CPU Usage: %.2f%%</h2>", usage);
strncat(buffer, temp, buf_size - strlen(buffer) - 1);
}
void get_memory_usage(char *buffer, size_t buf_size)
{
// read from /proc/meminfo
FILE *fp = fopen("/proc/meminfo", "r");
if (fp)
{
char line[256];
long total_mem = 0, free_mem = 0;
while (fgets(line, sizeof(line), fp))
{
if (sscanf(line, "MemTotal: %ld", &total_mem) == 1 ||
sscanf(line, "MemFree: %ld", &free_mem) == 1)
{
if (total_mem && free_mem)
break;
}
}
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer), "<h3>Memory Usage: Total: %ld MB, Used: %ld MB</h3>",
total_mem / 1024, (total_mem - free_mem) / 1024);
fclose(fp);
}
else
{
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer), "<h3>Memory Usage: N/A</h3>");
}
}
void get_kernel_version(char *buffer, size_t buf_size)
{
// read from /proc/version
FILE *fp = fopen("/proc/version", "r");
if (fp)
{
char line[256];
if (fgets(line, sizeof(line), fp))
{
strncat(buffer, "<h3>Kernel Version: ", buf_size - strlen(buffer) - 1);
strncat(buffer, line, buf_size - strlen(buffer) - 1);
strncat(buffer, "</h3>", buf_size - strlen(buffer) - 1);
}
fclose(fp);
}
else
{
strncat(buffer, "<h3>Kernel Version: N/A</h3>", buf_size - strlen(buffer) - 1);
}
}
void get_processes(char *buffer, size_t buf_size, int page)
{
strncat(buffer, "<h3>Running Processes</h3><ul>", buf_size - strlen(buffer) - 1);
DIR *dir = opendir("/proc");
struct dirent *entry;
if (!dir)
{
strncat(buffer, "Unable to open /proc.<br>", buf_size - strlen(buffer) - 1);
return;
}
struct stat st;
int count = 0;
int start_index = (page - 1) * PROCESSES_PER_PAGE;
while ((entry = readdir(dir)) != NULL)
{
if (isdigit(entry->d_name[0]))
{
if (count >= start_index && count < start_index + PROCESSES_PER_PAGE)
{
char path[256];
snprintf(path, sizeof(path), "/proc/%s/cmdline", entry->d_name);
FILE *fp = fopen(path, "r");
if (fp)
{
char cmdline[256];
fgets(cmdline, sizeof(cmdline), fp);
fclose(fp);
if (strlen(cmdline) > 0)
{
strncat(buffer, "<li>", buf_size - strlen(buffer) - 1);
strncat(buffer, entry->d_name, buf_size - strlen(buffer) - 1); // PID
strncat(buffer, ": ", buf_size - strlen(buffer) - 1);
strncat(buffer, cmdline, buf_size - strlen(buffer) - 1); // Command
strncat(buffer, "</li>", buf_size - strlen(buffer) - 1);
}
}
}
count++;
}
}
closedir(dir);
strncat(buffer, "</ul><br>", buf_size - strlen(buffer) - 1);
// Pagination links
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer), "<p>");
if (page > 1)
{
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer), "<a href=\"/?page=%d\">Previous</a> ", page - 1);
}
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer), "<a href=\"/?page=%d\">Next</a>", page + 1);
snprintf(buffer + strlen(buffer), buf_size - strlen(buffer) - 1, "</p>");
}
void get_disks(char *buffer, size_t buf_size)
{
// read from /proc/partitions
FILE *fp = fopen("/proc/partitions", "r");
if (fp)
{
char line[256];
// Skip the first two lines (header)
fgets(line, sizeof(line), fp);
fgets(line, sizeof(line), fp);
strncat(buffer, "<h3>Disks</h3>", buf_size - strlen(buffer) - 1);
while (fgets(line, sizeof(line), fp))
{
unsigned long blocks;
char name[32];
// Parse the line to get the number of blocks and the disk name
if (sscanf(line, "%*d %*d %lu %31s", &blocks, name) == 2)
{
// Only consider whole disks (e.g., sda, sdb) and not partitions (e.g., sda1, sda2)
if (strchr(name, '/') == NULL && strchr(name, 's') == name)
{
unsigned long size_in_bytes = blocks * 1024; // Assuming block size is 1024 bytes
char disk_info[256];
snprintf(disk_info, sizeof(disk_info), "<li>%s: %lu bytes</li>", name, size_in_bytes);
strncat(buffer, disk_info, buf_size - strlen(buffer) - 1);
}
}
}
fclose(fp);
}
else
{
strncat(buffer, "<h3>Disks: N/A</h3>", buf_size - strlen(buffer) - 1);
}
}
void get_usb_devices(char *buffer, size_t buf_size)
{
FILE *fp = fopen("/proc/bus/input/devices", "r");
if (fp)
{
char line[256];
int is_usb_device = 0;
char added_devices[1024] = "";
strncat(buffer, "<h3>USB Devices</h3><ul>", buf_size - strlen(buffer) - 1);
while (fgets(line, sizeof(line), fp))
{
if (strstr(line, "Bus=0003"))
{
is_usb_device = 1;
}
if (is_usb_device && strstr(line, "Name="))
{
char *usb_device = strstr(line, "Name=");
if (usb_device)
{
if (!strstr(added_devices, usb_device))
{
strncat(buffer, "<li>", buf_size - strlen(buffer) - 1);
strncat(buffer, usb_device + 5, buf_size - strlen(buffer) - 1); // Skip "Name="
strncat(buffer, "</li>", buf_size - strlen(buffer) - 1);
strncat(added_devices, usb_device, sizeof(added_devices) - strlen(added_devices) - 1);
}
}
is_usb_device = 0;
}
}
strncat(buffer, "</ul><br>", buf_size - strlen(buffer) - 1);
fclose(fp);
}
else
{
strncat(buffer, "<h3>USB Devices: N/A</h3>", buf_size - strlen(buffer) - 1);
}
}
void get_network_adapters(char *buffer, size_t buf_size)
{
strncat(buffer, "<h3>Network Adapters</h3><ul>", buf_size - strlen(buffer) - 1);
FILE *fp = fopen("/proc/net/dev", "r");
if (fp)
{
char line[256];
while (fgets(line, sizeof(line), fp))
{
if (strchr(line, ':'))
{
char *iface = strtok(line, ":");
if (iface)
{
strncat(buffer, "<li>", buf_size - strlen(buffer) - 1);
strncat(buffer, iface, buf_size - strlen(buffer) - 1);
strncat(buffer, " - IP: ", buf_size - strlen(buffer) - 1);
char ip[64];
snprintf(ip, sizeof(ip), "ip -o -4 addr show %s | awk '{print $4}'", iface);
FILE *ip_fp = popen(ip, "r");
char ip_addr[32];
if (fgets(ip_addr, sizeof(ip_addr), ip_fp))
{
strncat(buffer, ip_addr, buf_size - strlen(buffer) - 1);
}
pclose(ip_fp);
strncat(buffer, "</li>", buf_size - strlen(buffer) - 1);
}
}
}
fclose(fp);
}
strncat(buffer, "</ul><br>", buf_size - strlen(buffer) - 1);
}
int main(void)
{
struct sockaddr_in si_me, si_other;
int s, conn, slen = sizeof(si_other), recv_len;
char buf[BUFLEN];
char http_ok[] = "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n";
char page[BUFLEN * 10]; // Increase buffer size for larger pages
// Create a TCP socket
if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
die("socket");
// Zero out the structure
memset((char *)&si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(PORT);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
// Bind socket to port
if (bind(s, (struct sockaddr *)&si_me, sizeof(si_me)) == -1)
die("bind");
// Allow 10 requests to queue up
if (listen(s, 10) == -1)
die("listen");
// Keep listening for data
while (1)
{
printf("Waiting for connection...\n");
fflush(stdout);
conn = accept(s, (struct sockaddr *)&si_other, &slen);
if (conn < 0)
{
perror("accept");
continue;
}
printf("Client connected: %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
memset(buf, 0, sizeof(buf));
recv_len = read(conn, buf, BUFLEN);
if (recv_len < 0)
{
perror("read");
close(conn);
continue;
}
printf("Received request:\n%s\n", buf);
// Parse the page number from the request
int page_number = 1;
char *page_param = strstr(buf, "page=");
if (page_param)
{
sscanf(page_param, "page=%d", &page_number);
}
// Clear the page buffer
memset(page, 0, sizeof(page));
// Add HTML header
strncat(page, "<html><head><title>System Information</title></head><body><h1>System Information</h1>", sizeof(page) - strlen(page) - 1);
get_uptime(page, sizeof(page));
get_current_datetime(page, sizeof(page));
get_processor_usage(page, sizeof(page));
get_processor_info(page, sizeof(page));
get_memory_usage(page, sizeof(page));
get_kernel_version(page, sizeof(page));
get_processes(page, sizeof(page), page_number);
get_disks(page, sizeof(page));
get_usb_devices(page, sizeof(page));
get_network_adapters(page, sizeof(page));
strncat(page, "</body></html>", sizeof(page) - strlen(page) - 1);
printf("Sending response:\n%s\n", page);
if (write(conn, http_ok, strlen(http_ok)) < 0)
{
perror("write");
close(conn);
continue;
}
if (write(conn, page, strlen(page)) < 0)
{
perror("write");
close(conn);
continue;
}
close(conn);
}
close(s);
return 0;
}