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retoor 2025-11-29 13:27:04 +01:00
parent 378f64fc75
commit dbd4fe22ed
3 changed files with 59 additions and 47 deletions
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73
src/connection.c
View File

@ -478,59 +478,38 @@ void connection_connect_to_upstream(connection_t *client, const char *data, size
size_t len_to_send = data_len;
char *modified_request = NULL;
if (route->rewrite_host) {
char new_host_header[512];
const char *old_host_header_start = NULL;
const char *old_host_header_end = NULL;
if (route->rewrite_host) {
char new_host_header[512];
const char *old_host_header_start = NULL;
const char *old_host_header_end = NULL;
const char *current = data;
const char *end = data + data_len;
while(current < end) {
const char* line_end = memchr(current, '\n', end - current);
if (!line_end) break;
if (strncasecmp(current, "Host", 4) == 0) {
const char *colon = current + 4;
while (colon < line_end && (*colon == ' ' || *colon == '\t')) {
colon++;
if (http_find_header_line_bounds(data, data_len, "Host", &old_host_header_start, &old_host_header_end)) {
int is_default_port = (route->use_ssl && route->upstream_port == 443) ||
(!route->use_ssl && route->upstream_port == 80);
if (is_default_port) {
snprintf(new_host_header, sizeof(new_host_header), "Host: %s\r\n", route->upstream_host);
} else {
snprintf(new_host_header, sizeof(new_host_header), "Host: %s:%d\r\n", route->upstream_host, route->upstream_port);
}
if (colon < line_end && *colon == ':') {
old_host_header_start = current;
old_host_header_end = line_end + 1;
break;
size_t new_host_len = strlen(new_host_header);
size_t old_host_len = old_host_header_end - old_host_header_start;
len_to_send = data_len - old_host_len + new_host_len;
modified_request = malloc(len_to_send + 1);
if (modified_request) {
char* p = modified_request;
size_t prefix_len = old_host_header_start - data;
memcpy(p, data, prefix_len);
p += prefix_len;
memcpy(p, new_host_header, new_host_len);
p += new_host_len;
size_t suffix_len = data_len - (old_host_header_end - data);
memcpy(p, old_host_header_end, suffix_len);
data_to_send = modified_request;
}
}
current = line_end + 1;
}
if (old_host_header_start) {
int is_default_port = (route->use_ssl && route->upstream_port == 443) ||
(!route->use_ssl && route->upstream_port == 80);
if (is_default_port) {
snprintf(new_host_header, sizeof(new_host_header), "Host: %s\r\n", route->upstream_host);
} else {
snprintf(new_host_header, sizeof(new_host_header), "Host: %s:%d\r\n", route->upstream_host, route->upstream_port);
}
size_t new_host_len = strlen(new_host_header);
size_t old_host_len = old_host_header_end - old_host_header_start;
len_to_send = data_len - old_host_len + new_host_len;
modified_request = malloc(len_to_send + 1);
if (modified_request) {
char* p = modified_request;
size_t prefix_len = old_host_header_start - data;
memcpy(p, data, prefix_len);
p += prefix_len;
memcpy(p, new_host_header, new_host_len);
p += new_host_len;
size_t suffix_len = data_len - (old_host_header_end - data);
memcpy(p, old_host_header_end, suffix_len);
data_to_send = modified_request;
}
}
}
if (buffer_ensure_capacity(&up->write_buf, len_to_send) == 0) {
memcpy(up->write_buf.data, data_to_send, len_to_send);
up->write_buf.tail = len_to_send;

32
src/http.c
View File

@ -251,3 +251,35 @@ int http_rewrite_content_length(char *headers, size_t *headers_len, size_t max_l
*headers_len = new_total_len;
return 1;
}
int http_find_header_line_bounds(const char* data, size_t len, const char* name, const char** line_start, const char** line_end) {
size_t name_len = strlen(name);
const char* end = data + len;
for (const char* p = data; p < end; ) {
const char* current_line_end = memchr(p, '\n', end - p);
if (!current_line_end) break;
const char* line_actual_end = current_line_end;
if (line_actual_end > p && *(line_actual_end - 1) == '\r') {
line_actual_end--;
}
// Check for header name followed by optional whitespace and a colon
if ((size_t)(line_actual_end - p) > name_len && strncasecmp(p, name, name_len) == 0) {
const char* colon_pos = p + name_len;
while (colon_pos < line_actual_end && (*colon_pos == ' ' || *colon_pos == '\t')) {
colon_pos++;
}
if (colon_pos < line_actual_end && *colon_pos == ':') {
*line_start = p;
*line_end = current_line_end + 1; // Include the \n (and \r if present)
return 1;
}
}
p = current_line_end + 1;
}
*line_start = NULL;
*line_end = NULL;
return 0;
}

1
src/http.h
View File

@ -11,5 +11,6 @@ int http_detect_binary_content(const char *data, size_t len);
long http_get_content_length(const char *headers, size_t headers_len);
int http_find_headers_end(const char *data, size_t len, size_t *headers_end);
int http_rewrite_content_length(char *headers, size_t *headers_len, size_t max_len, long new_length);
int http_find_header_line_bounds(const char* data, size_t len, const char* name, const char** line_start, const char** line_end);
#endif