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authorSanto Cariotti <santo@dcariotti.me>2021-10-22 23:01:01 +0200
committerSanto Cariotti <santo@dcariotti.me>2021-10-22 23:01:01 +0200
commitcd21f919f347d3129e5994d303bce240e7f84cdc (patch)
tree004e816984444db80c13608a7a88a3af015f375d /Year_3
parent7d26f21876541da89b2776e1117d1c6847819027 (diff)
return the response
Diffstat (limited to 'Year_3')
-rw-r--r--Year_3/TSDWL/webserver/server.c116
1 files changed, 105 insertions, 11 deletions
diff --git a/Year_3/TSDWL/webserver/server.c b/Year_3/TSDWL/webserver/server.c
index fda2f14..dce54f9 100644
--- a/Year_3/TSDWL/webserver/server.c
+++ b/Year_3/TSDWL/webserver/server.c
@@ -11,6 +11,7 @@
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <time.h>
#include <unistd.h>
#define DEFAULT_WWW "./www"
@@ -36,6 +37,25 @@ typedef enum {
HTTP2, /* HTTP/2 */
} http_t;
+typedef enum {
+ /* Get some responses names from [1]
+ *
+ * [1] https://www.django-rest-framework.org/api-guide/status-codes/#successful-2xx
+ */
+ HTTP_200_OK,
+ HTTP_206_PARTIAL_CONTENT,
+ HTTP_404_NOT_FOUND,
+ /* TODO: Include more and more responses */
+} response_t;
+
+char*
+response_text(response_t response)
+{
+ char* map[] = { "200 OK", "206 PARTIAL CONTENT", "404 NOT FOUND" };
+
+ return map[response];
+}
+
typedef struct {
methods method;
char path[256]; /* FIXME: handle path with more than 256 chars */
@@ -53,7 +73,7 @@ read_headers(int* fd, char** headers, int* headers_num)
*headers_num = 0;
- while (1) {
+ while (*headers_num < 24) {
i = 0;
buffer[0] = '\0';
@@ -92,13 +112,15 @@ get_client_ip(int fd, char* buffer)
}
int
-parse_first_line(request_t* request, char* header, size_t len)
+parse_first_line(request_t* request, const char* header, size_t len)
{
char* token;
+ char line[255];
int i;
i = 0;
- token = strtok(header, " ");
+ strcpy(line, header);
+ token = strtok(line, " ");
do {
switch (i) {
case 0: {
@@ -150,7 +172,7 @@ parse_error:
}
void
-read_file(char* root, char* file, int client)
+read_file(char* root, request_t* request, int client)
{
/* FIXME: In Linux the max name length is 255, but here we include the
* root, and I don't want to use an array of 511 bytes (255*2+1). So I am
@@ -161,10 +183,22 @@ read_file(char* root, char* file, int client)
int fd;
int root_len;
int file_len;
-
+ char* file;
+ response_t response;
+ int is_partial_file;
+ time_t now;
+ struct stat sb;
+
+ /* Copy the path because we shouldn't edit the variable on the stack */
+ file = request->path;
root_len = strlen(root);
file_len = strlen(file);
+ if (root[0] == '.' && root[1] == '/') {
+ root += 2;
+ root_len -= 2;
+ }
+
if (root[root_len - 1] == '/') {
root_len--;
}
@@ -179,20 +213,80 @@ read_file(char* root, char* file, int client)
strncpy(path + root_len, file, file_len);
if ((fd = open(path, O_RDONLY)) == -1) {
- strcpy(buffer, "Error opening the file on server");
+ fprintf(stderr, "The file is: %s\n\n", path);
+ perror("Error opening the file on server");
+ response = HTTP_404_NOT_FOUND;
+ switch (request->http_version) {
+ case HTTP1:
+ strcpy(buffer, "HTTP/1.0 ");
+ break;
+ case HTTP1_1:
+ strcpy(buffer, "HTTP/1.1 ");
+ break;
+ case HTTP2:
+ strcpy(buffer, "HTTP/2 ");
+ break;
+ }
+
+ strcpy(buffer + strlen(buffer), response_text(response));
+ strcpy(buffer + strlen(buffer), "\n\n");
+ write(client, buffer, strlen(buffer));
- /* Write the error to the client and also to the server */
- write(client, buffer, strlen(buffer) + 1);
- perror(buffer);
return;
}
+ /* The first time search if it raises an error */
+ is_partial_file = 0;
while ((n = read(fd, buffer, sizeof(buffer))) != 0) {
if (n == -1) {
- perror("Error reading the file");
+ is_partial_file = 1;
break;
}
+ }
+
+ /* The second time send to client the file readed */
+ lseek(fd, SEEK_SET, 0);
+
+ /* First line of response */
+ response = (is_partial_file) ? HTTP_206_PARTIAL_CONTENT : HTTP_200_OK;
+ switch (request->http_version) {
+ case HTTP1:
+ strcpy(buffer, "HTTP/1.0 ");
+ break;
+ case HTTP1_1:
+ strcpy(buffer, "HTTP/1.1 ");
+ break;
+ case HTTP2:
+ strcpy(buffer, "HTTP/2 ");
+ break;
+ }
+
+ strcpy(buffer + strlen(buffer), response_text(response));
+ strcpy(buffer + strlen(buffer), "\n");
+ write(client, buffer, strlen(buffer));
+
+ if (fstat(fd, &sb) != -1) {
+ /* Thx to [1]
+ * [1] https://www.tutorialspoint.com/c_standard_library/c_function_ctime.htm
+ */
+ time(&now);
+ sprintf(buffer, "Date: %s", ctime(&now));
+ write(client, buffer, strlen(buffer));
+
+ sprintf(buffer, "Content-Type: text/txt; charset=UTF-8\n");
+ write(client, buffer, strlen(buffer));
+ sprintf(buffer, "Content-Length: %ld\n", sb.st_size);
+ write(client, buffer, strlen(buffer));
+
+ sprintf(buffer, "Last-Modified: %s\n", ctime(&sb.st_mtime));
+ write(client, buffer, strlen(buffer));
+ }
+
+ while ((n = read(fd, buffer, sizeof(buffer))) != 0) {
+ if (n == -1) {
+ break;
+ }
buffer[n] = '\0';
write(client, buffer, strlen(buffer) + 1);
}
@@ -263,7 +357,7 @@ main(int argc, char* argv[])
if (parse_first_line(&request, headers[0], strlen(headers[0])) > -1) {
if (request.method == GET) {
- read_file(www_path, request.path, clientfd);
+ read_file(www_path, &request, clientfd);
}
}