diff options
| -rw-r--r-- | Year_3/TSDWL/webserver/server.c | 116 |
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); } } |