static void send_file(int client_socket, const char *
filename)
{
/**
* file_stat S
tore file metadata
* dir A direc
tory flow pointer that is used
to iterate \
* through the contents of the catalog
* response HTML response buffer
* entry Catalog entry information
* length Records the number of bytes that have been \
* written
to the buffer at the moment
* path Temporarily s
tores the full path
to the direc
tory entry
* entry_stat S
tores the metadata of individual files within a direc
tory
* size_str File size formatting string
*
fd File descrip
tor
* buffer File read/write buffer
* bytes_read Records the number of bytes per read() read
*/
struct stat file_stat;
DIR *dir = NULL;
char response[BUFFER_SIZE * 2];
struct dirent *entry;
int length = 0;
char path[1024];
struct stat entry_stat;
char size_str[20];
int
fd;
char buffer[BUFFER_SIZE];
ssize_t bytes_read;
if (0 > stat(
filename, &file_stat))
{
send_error(client_socket, 404, "Not Found", "File not found");
return;
}
if (S_ISDIR(file_stat.st_mode))
{
/* If it's a catalog, list the contents of the catalog */
dir = opendir(
filename);
if (!dir)
{
send_error(client_socket, 403, "Forbidden", "Cannot list direc
tory");
return;
}
length = snprintf(response, sizeof(response),
"<html><head><title>Index of %s</title></head>"
"<body><h1>Index of %s</h1><ul>",
filename,
filename);
while (NULL != (entry = readdir(dir)))
{
/* Skip hidden files and current/parent direc
tories */
if ('.' == entry->d_name[0])
{
continue;
}
snprintf(path, sizeof(path), "%s/%s",
filename, entry->d_name);
stat(path, &entry_stat);
if (S_ISDIR(entry_stat.st_mode))
{
strcpy(size_str, "<DIR>");
} else
{
snprintf(size_str, sizeof(size_str), "%ld bytes", entry_stat.st_size);
}
length += snprintf(response + length, sizeof(response) - length,
"<li><a href=\"%s\">%s</a> - %s</li>",
entry->d_name, entry->d_name, size_str);
}
length += snprintf(response + length, sizeof(response) - length, "</ul></body></html>");
closedir(dir);
send_headers(client_socket, 200, "OK", "text/html", length);
send(client_socket, response, length, 0);
return;
}
/* Send the file content */
fd = open(
filename, O_RDONLY);
if (0 >
fd)
{
send_error(client_socket, 403, "Forbidden", "Cannot open file");
return;
}
/* Send HTTP headers */
const char *mime_type = get_mime_type(
filename);
send_headers(client_socket, 200, "OK", mime_type, file_stat.st_size);
/* Send the file content */
while (0 < (bytes_read = read(
fd, buffer, sizeof(buffer))))
{
send(client_socket, buffer, bytes_read, 0);
}
close(
fd);
}以上代码有没有什么问题
本文详细解析了如何通过进程ID和文件描述符获取文件路径及名称，并使用readlink函数实现路径解析。
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