Files
sesimos/src/http.c

283 lines
8.9 KiB
C

/**
* Necronda Web Server
* HTTP implementation
* src/net/http.c
* Lorenz Stechauner, 2020-12-09
*/
#include "http.h"
#include "utils.h"
void http_to_camel_case(char *str, int mode) {
char last = '-';
char ch;
for (int i = 0; i < strlen(str); i++) {
ch = str[i];
if (mode == HTTP_CAMEL && last == '-' && ch >= 'a' && ch <= 'z') {
str[i] = (char) ((int) ch & 0x5F);
} else if (mode == HTTP_LOWER && ch >= 'A' && ch <= 'Z') {
str[i] = (char) ((int) ch | 0x20);
}
last = str[i];
}
}
void http_free_hdr(http_hdr *hdr) {
for (int i = 0; i < hdr->field_num; i++) {
free(hdr->fields[i][0]);
free(hdr->fields[i][1]);
}
hdr->field_num = 0;
}
void http_free_req(http_req *req) {
if (req->uri == NULL) free(req->uri);
req->uri = NULL;
http_free_hdr(&req->hdr);
}
void http_free_res(http_res *res) {
http_free_hdr(&res->hdr);
}
int http_parse_header_field(http_hdr *hdr, const char *buf, const char *end_ptr) {
char *pos1 = memchr(buf, ':', end_ptr - buf);
char *pos2;
if (pos1 == NULL) {
print(ERR_STR "Unable to parse header" CLR_STR);
return 3;
}
long len = pos1 - buf;
hdr->fields[hdr->field_num][0] = malloc(len + 1);
sprintf(hdr->fields[hdr->field_num][0], "%.*s", (int) len, buf);
http_to_camel_case(hdr->fields[hdr->field_num][0], HTTP_CAMEL);
pos1++;
pos2 = (char *) end_ptr - 1;
while (pos1[0] == ' ') pos1++;
while (pos2[0] == ' ') pos2--;
len = pos2 - pos1 + 1;
if (len <= 0) {
hdr->fields[hdr->field_num][1] = malloc(1);
hdr->fields[hdr->field_num][1][0] = 0;
} else {
hdr->fields[hdr->field_num][1] = malloc(len + 1);
sprintf(hdr->fields[hdr->field_num][1], "%.*s", (int) len, pos1);
}
hdr->field_num++;
return 0;
}
int http_receive_request(sock *client, http_req *req) {
unsigned long rcv_len, len;
char *ptr, *pos0, *pos1, *pos2;
char buf[CLIENT_MAX_HEADER_SIZE];
memset(buf, 0, sizeof(buf));
memset(req->method, 0, sizeof(req->method));
memset(req->version, 0, sizeof(req->version));
req->uri = NULL;
req->hdr.field_num = 0;
while (1) {
if (client->enc) {
rcv_len = SSL_read(client->ssl, buf, CLIENT_MAX_HEADER_SIZE);
if (rcv_len < 0) {
print(ERR_STR "Unable to receive: %s" CLR_STR, ssl_get_error(client->ssl, rcv_len));
return -1;
}
} else {
rcv_len = recv(client->socket, buf, CLIENT_MAX_HEADER_SIZE, 0);
if (rcv_len < 0) {
print(ERR_STR "Unable to receive: %s" CLR_STR, strerror(errno));
return -1;
}
}
if (rcv_len == 0) {
print("Unable to receive: closed");
return -1;
}
unsigned long header_len = strstr(buf, "\r\n\r\n") - buf + 4;
if (header_len <= 0) {
print(ERR_STR "Unable to parse header: End of header not found" CLR_STR);
return 5;
}
for (int i = 0; i < header_len; i++) {
if ((buf[i] >= 0x00 && buf[i] <= 0x1F && buf[i] != '\r' && buf[i] != '\n') || buf[i] == 0x7F) {
print(ERR_STR "Unable to parse header: Header contains illegal characters" CLR_STR);
return 4;
}
}
ptr = buf;
while (header_len != (ptr - buf)) {
pos0 = strstr(ptr, "\r\n");
if (pos0 == NULL) {
print(ERR_STR "Unable to parse header: Invalid header format" CLR_STR);
return 1;
}
if (req->version[0] == 0) {
pos1 = memchr(ptr, ' ', rcv_len - (ptr - buf)) + 1;
if (pos1 == NULL) goto err_hdr_fmt;
if (pos1 - ptr - 1 >= sizeof(req->method)) {
print(ERR_STR "Unable to parse header: Method name too long" CLR_STR);
return 2;
}
for (int i = 0; i < (pos1 - ptr - 1); i++) {
if (ptr[i] < 'A' || ptr[i] > 'Z') {
print(ERR_STR "Unable to parse header: Invalid method" CLR_STR);
return 2;
}
}
strncpy(req->method, ptr, pos1 - ptr - 1);
pos2 = memchr(pos1, ' ', rcv_len - (pos1 - buf)) + 1;
if (pos2 == NULL) {
err_hdr_fmt:
print(ERR_STR "Unable to parse header: Invalid header format" CLR_STR);
return 1;
}
if (memcmp(pos2, "HTTP/", 5) != 0 || memcmp(pos2 + 8, "\r\n", 2) != 0) {
print(ERR_STR "Unable to parse header: Invalid version" CLR_STR);
return 3;
}
len = pos2 - pos1 - 1;
req->uri = malloc(len + 1);
sprintf(req->uri, "%.*s", (int) len, pos1);
sprintf(req->version, "%.3s", pos2 + 5);
} else {
int ret = http_parse_header_field(&req->hdr, ptr, pos0);
if (ret != 0) return ret;
}
if (pos0[2] == '\r' && pos0[3] == '\n') {
return 0;
}
ptr = pos0 + 2;
}
}
}
char *http_get_header_field(const http_hdr *hdr, const char *field_name) {
char field_name_1[256], field_name_2[256];
strcpy(field_name_1, field_name);
http_to_camel_case(field_name_1, HTTP_LOWER);
for (int i = 0; i < hdr->field_num; i++) {
strcpy(field_name_2, hdr->fields[i][0]);
http_to_camel_case(field_name_2, HTTP_LOWER);
if (strcmp(field_name_1, field_name_2) == 0) {
return hdr->fields[i][1];
}
}
return NULL;
}
void http_add_header_field(http_hdr *hdr, const char *field_name, const char *field_value) {
size_t len_name = strlen(field_name);
size_t len_value = strlen(field_value);
char *_field_name = malloc(len_name + 1);
char *_field_value = malloc(len_value + 1);
strcpy(_field_name, field_name);
strcpy(_field_value, field_value);
http_to_camel_case(_field_name, HTTP_PRESERVE);
hdr->fields[hdr->field_num][0] = _field_name;
hdr->fields[hdr->field_num][1] = _field_value;
hdr->field_num++;
}
void http_remove_header_field(http_hdr *hdr, const char *field_name, int mode) {
char field_name_1[256], field_name_2[256];
strcpy(field_name_1, field_name);
http_to_camel_case(field_name_1, HTTP_LOWER);
for (int i = 0; i < hdr->field_num; i++) {
strcpy(field_name_2, hdr->fields[i][0]);
http_to_camel_case(field_name_2, HTTP_LOWER);
if (strcmp(field_name_1, field_name_2) == 0) {
for (int j = i; j < hdr->field_num - 1; j++) {
memcpy(hdr->fields[j], hdr->fields[j + 1], sizeof(hdr->fields[0]));
}
hdr->field_num--;
if (mode == HTTP_REMOVE_ONE) {
return;
} else if (mode == HTTP_REMOVE_ALL) {
i--;
}
}
}
}
int http_send_response(sock *client, http_res *res) {
char buf[CLIENT_MAX_HEADER_SIZE];
int len = 0;
int snd_len = 0;
len += sprintf(buf + len, "HTTP/%s %03i %s\r\n", res->version, res->status->code, res->status->msg);
for (int i = 0; i < res->hdr.field_num; i++) {
len += sprintf(buf + len, "%s: %s\r\n", res->hdr.fields[i][0], res->hdr.fields[i][1]);
}
len += sprintf(buf + len, "\r\n");
if (client->enc) {
snd_len = SSL_write(client->ssl, buf, len);
} else {
snd_len = send(client->socket, buf, len, 0);
}
return 0;
}
http_status *http_get_status(unsigned short status_code) {
for (int i = 0; i < sizeof(http_statuses) / sizeof(http_status); i++) {
if (http_statuses[i].code == status_code) {
return &http_statuses[i];
}
}
return NULL;
}
http_error_msg *http_get_error_msg(unsigned short status_code) {
for (int i = 0; i < sizeof(http_error_messages) / sizeof(http_error_msg); i++) {
if (http_error_messages[i].code == status_code) {
return &http_error_messages[i];
}
}
return NULL;
}
const char *http_get_status_color(http_status *status) {
unsigned short code = status->code;
if (code >= 100 && code < 200) {
return HTTP_1XX_STR;
} else if (code >= 200 && code < 300 || code == 304) {
return HTTP_2XX_STR;
} else if (code >= 300 && code < 400) {
return HTTP_3XX_STR;
} else if (code >= 400 && code < 500) {
return HTTP_4XX_STR;
} else if (code >= 500 && code < 600) {
return HTTP_5XX_STR;
}
return "";
}
char *http_format_date(time_t time, char *buf, size_t size) {
struct tm *timeinfo = gmtime(&time);
strftime(buf, size, "%a, %d %b %Y %H:%M:%S GMT", timeinfo);
return buf;
}
char *http_get_date(char *buf, size_t size) {
time_t rawtime;
time(&rawtime);
return http_format_date(rawtime, buf, size);
}