lynq/MD310EU/ap/app/cgi/cgi.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "cfg_api.h"

#define BUFFER_SIZE (1024 * 20) // Define the buffer size for each read
#define FIND_STR_LEN 128 // Define the length of the string to find
#define FOTA_UPDATE_STATUS_FILE "/cache/zte_fota/update_status"

// Custom memmem function
static void* custom_memmem(const void* haystack, size_t haystack_len, const void* needle, size_t needle_len)
{
    if (needle_len == 0 || haystack_len < needle_len)
    {
        return NULL;
    }

    size_t i = 0;
    const unsigned char* h = (const unsigned char*)haystack;
    const unsigned char* n = (const unsigned char*)needle;

    for (i = 0; i <= haystack_len - needle_len; ++i)
    {
        if (memcmp(h + i, n, needle_len) == 0)
        {
            return (void*)(h + i);
        }
    }

    return NULL;
}

// Remove the last boundary marker from the file
static int remove_last_boundary(const char *filename, const char *boundary_marker, int boundary_marker_len)
{
    int fd = open(filename, O_RDWR);
    if (fd == -1)
    {
        perror("Unable to open file for reading and writing");
        return 1;
    }

    // Get the file size
    off_t file_size = lseek(fd, 0, SEEK_END);
    if (file_size == -1)
    {
        perror("Unable to get file size");
        close(fd);
        return 1;
    }

    // Search for the boundary_marker from the end of the file
    off_t search_start = file_size - FIND_STR_LEN;
    if (search_start < 0)
    {
        search_start = 0;
    }

    lseek(fd, search_start, SEEK_SET);

    char buffer[FIND_STR_LEN + 1]; // +1 for storing '\0'
    int bytes_read = read(fd, buffer, FIND_STR_LEN);
    if (bytes_read <= 0)
    {
        perror("Unable to read file");
        close(fd);
        return 1;
    }
    buffer[bytes_read] = '\0'; // Ensure the string is null-terminated

    // Find the boundary_marker
    char *boundary = custom_memmem(buffer, bytes_read, boundary_marker, boundary_marker_len);
    if (boundary)
    {
        // Found boundary_marker, calculate the truncate position
        off_t truncate_pos = search_start + (boundary - buffer);
        if (ftruncate(fd, truncate_pos) == -1)
        {
            perror("Unable to truncate file");
            close(fd);
            return 1;
        }
    }

    close(fd);
    return 0;
}

// Function to handle file upload
static int handle_file_upload(const char *source_filename, const char *target_filename, int content_length)
{
    char buffer[BUFFER_SIZE];
    int bytes_read;
    int target_fd = -1;
    int source_fd = -1; // Source file descriptor
    char *content_start_ptr = NULL;
    int content_start = 0;
    const char *boundary_marker = "\r\n------"; // Boundary marker
    int boundary_marker_len = strlen(boundary_marker);

    // Open the target file
    target_fd = open(target_filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if (target_fd == -1)
    {
        perror("Unable to open target file");
        return 1;
    }

    // Open the source file
    source_fd = open(source_filename, O_RDONLY);
    if (source_fd == -1)
    {
        perror("Unable to open source file");
        close(target_fd);
        return 1;
    }

    // Read the request header to find the start position of file content
    bytes_read = read(source_fd, buffer, BUFFER_SIZE);
    if (bytes_read <= 0)
    {
        printf("Content-type: text/html\r\n\r\n");
        printf("<h1>Error: Failed to read data</h1>");
        printf("<p>Error number: %d - %s</p>", errno, strerror(errno));
        close(target_fd);
        close(source_fd);
        return 1;
    }

    // Find the start position of the file content (usually after \r\n\r\n)
    content_start_ptr = strstr(buffer, "\r\n\r\n");
    if (!content_start_ptr)
    {
        printf("Content-type: text/html\r\n\r\n");
        printf("<h1>Error: Unable to find the start position of file content</h1>");
        close(target_fd);
        close(source_fd);
        return 1;
    }

    // Calculate the actual start position of the file content
    content_start = content_start_ptr - buffer + 4;

    // Write the first part of the file content
    if (content_start < bytes_read)
    {
        if (write(target_fd, buffer + content_start, bytes_read - content_start) == -1)
        {
            perror("Unable to write to target file");
            close(target_fd);
            close(source_fd);
            return 1;
        }
    }

    // Update the remaining content length
    content_length -= (bytes_read - content_start);

    // Continue reading and writing the file in segments
    while (content_length > 0)
    {
        bytes_read = read(source_fd, buffer, BUFFER_SIZE);
        if (bytes_read <= 0)
        {
            // If reading is complete, normally break out of the loop
            break;
        }

        // Write the file content
        if (write(target_fd, buffer, bytes_read) == -1)
        {
            perror("Unable to write to target file");
            close(target_fd);
            close(source_fd);
            return 1;
        }

        // Update the remaining content length
        content_length -= bytes_read;
    }

    // Close file descriptors
    close(target_fd);
    close(source_fd);

    // Remove the last boundary marker from the file
    return remove_last_boundary(target_filename, boundary_marker, boundary_marker_len);
}

static int fota_is_file_exist(const char* path)
{
	if ( (path == NULL) || (*path == '\0') )
		return 0;
	if (access(path, R_OK) != 0)
		return 0;

	return 1;
}

static int fota_read_file(const char*path, char*buf, size_t sz)
{
	int fd = -1;
	size_t cnt;

	fd = open(path, O_RDONLY, 0);
	if(fd < 0)
	{
		printf("fota_read_file failed to open %s: %s\n", path, strerror(errno));
		cnt = -1;
		return cnt;
	}
	cnt = read(fd, buf, sz - 1);
	if(cnt <= 0)
	{
		printf("failed to read %s: %s\n", path, strerror(errno));
		close(fd);
		cnt = -1;
		return cnt;
	}
	buf[cnt] = '\0';
	if(buf[cnt - 1] == '\n')
	{
		cnt--;
		buf[cnt] = '\0';
	}
	close(fd);

	return cnt;
}

static int fota_read_file_int(const char* path, int *val)
{
	char buf[32];
	char *end;
	int ret;
	int tmp;

	ret = fota_read_file(path, buf, sizeof(buf));
	if(ret < 0)
		return -1;

	errno = 0;
	tmp = strtol(buf, &end, 0);
	if (errno == ERANGE)
    {
		printf("strtol errno %d: %s\n", errno, strerror(errno));
	}

	if ((end == buf) || ((end < buf + sizeof(buf)) && (*end != '\0')))
	{
		return -1;
	}

	*val = tmp;

	return 0;
}

static int fota_get_update_status(int *fota_status)
{
	int status = 0;
	int ret = 0;
	if(!fota_is_file_exist(FOTA_UPDATE_STATUS_FILE))
    {
		*fota_status = -1;
		return -1;
	}
	ret = fota_read_file_int(FOTA_UPDATE_STATUS_FILE, &status);
	if(ret < 0)
    {
		*fota_status = -1;
		return -1;
	}
	*fota_status = status;
	return 0;
}

static void print_json_response(int success, const char* message)
{
    printf("Content-type: application/json\r\n\r\n");
    printf("{\"success\": %d, \"message\": \"%s\"}\n", success, message);
}

static void cgi_fota_update_progress()
{
    int upgradeStatus, result;

    system("fota_upi -u verify > /dev/null 2>&1");
    sleep(1);
    result = fota_get_update_status(&upgradeStatus);
    if(result < 0)
    {
        cfg_set("fota_update_flag", "0");
        print_json_response(0, "Fail to read update file");
    }
    else if(upgradeStatus != 0)
    {
        cfg_set("fota_update_flag", "0");
        print_json_response(0, "Verify update file failed");
    }
    else
    {
        print_json_response(1, "File verification successful, start updating...");
        system("fota_upi -u recovery > /dev/null 2>&1 &");
    }
}

int main()
{
    const char *source_filename = "/tmp/firmware_tmp_file"; // Source file path
    const char *target_filename = "/cache/zte_fota/delta.package";  // Target file path
    const char *content_length_str = NULL;
    int content_length = 0;

    system("rm -rf /cache/zte_fota");
	system("mkdir -p /cache/zte_fota");

    // Get environment variables
    content_length_str = getenv("CONTENT_LENGTH");
    if (!content_length_str)
    {
        system("rm -rf /tmp/firmware_tmp_file");
        print_json_response(0, "Missing CONTENT_LENGTH environment variable");
        return 1;
    }

    content_length = atoi(content_length_str);
    if (content_length <= 0)
    {
        system("rm -rf /tmp/firmware_tmp_file");
        print_json_response(0, "Invalid CONTENT_LENGTH");
        return 1;
    }
    cfg_set("fota_update_flag", "1");
    // Call the file upload handling function
    if (handle_file_upload(source_filename, target_filename, content_length) != 0)
    {
        system("rm -rf /tmp/firmware_tmp_file");
        print_json_response(0, "File upload failed");
        cfg_set("fota_update_flag", "0");
        return 1;
    }

    // Output success information
    //print_json_response(1, "File upload successful");
    system("rm -rf /tmp/firmware_tmp_file");

    cgi_fota_update_progress();

    return 0;
}