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Remove gotos from proxy.c

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This commit is contained in:
Lorenz Stechauner
2023-01-26 18:06:53 +01:00
parent bd73061462
commit 7a3adc6ed3
1 changed files with 177 additions and 166 deletions
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343
src/lib/proxy.c
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@ -300,25 +300,8 @@ int proxy_response_header(http_req *req, http_res *res, host_config_t *conf) {
return 0;
}
int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_status_ctx *ctx, host_config_t *conf, sock *client, http_status *custom_status, char *err_msg) {
char buffer[CHUNK_SIZE], err_buf[256];
const char *connection, *upgrade, *ws_version;
long ret;
int tries = 0, retry = 0;
*proxy_ptr = proxy_get_by_conf(conf);
proxy_ctx_t *proxy = *proxy_ptr;
proxy->client = NULL;
if (proxy->initialized && sock_has_pending(&proxy->proxy) == 0)
goto proxy;
retry:
if (proxy->initialized)
proxy_close(proxy);
retry = 0;
tries++;
static int proxy_connect(proxy_ctx_t *proxy, host_config_t *conf, http_res *res, http_status_ctx *ctx, char *err_msg) {
char err_buf[256], addr_buf[1024];
int fd;
if ((fd = socket(AF_INET6, SOCK_STREAM, 0)) == -1) {
@ -329,8 +312,13 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
}
sock_init(&proxy->proxy, fd, 0);
if (sock_set_socket_timeout(&proxy->proxy, 1) != 0 || sock_set_timeout(&proxy->proxy, SERVER_TIMEOUT_INIT) != 0)
goto proxy_timeout_err;
if (sock_set_socket_timeout(&proxy->proxy, 1) != 0 || sock_set_timeout(&proxy->proxy, SERVER_TIMEOUT_INIT) != 0) {
res->status = http_get_status(500);
ctx->origin = INTERNAL;
error("Unable to set timeout for reverse proxy socket");
sprintf(err_msg, "Unable to set timeout for reverse proxy socket: %s", error_str(errno, err_buf, sizeof(err_buf)));
return -1;
}
struct hostent *host_ent = gethostbyname2(conf->proxy.hostname, AF_INET6);
if (host_ent == NULL) {
@ -340,7 +328,7 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
ctx->origin = SERVER_REQ;
error("Unable to connect to server: Name or service not known");
sprintf(err_msg, "Unable to connect to server: Name or service not known.");
goto proxy_err;
return -1;
}
}
@ -353,9 +341,9 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
memcpy(&address.sin6_addr, addr, 16);
}
inet_ntop(address.sin6_family, (void *) &address.sin6_addr, buffer, sizeof(buffer));
inet_ntop(address.sin6_family, (void *) &address.sin6_addr, addr_buf, sizeof(addr_buf));
info(BLUE_STR "Connecting to " BLD_STR "[%s]:%i" CLR_STR BLUE_STR "...", buffer, conf->proxy.port);
info(BLUE_STR "Connecting to " BLD_STR "[%s]:%i" CLR_STR BLUE_STR "...", addr_buf, conf->proxy.port);
if (connect(proxy->proxy.socket, (struct sockaddr *) &address, sizeof(address)) < 0) {
if (errno == ETIMEDOUT || errno == EINPROGRESS) {
res->status = http_get_status(504);
@ -367,18 +355,17 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
res->status = http_get_status(500);
ctx->origin = INTERNAL;
}
error("Unable to connect to [%s]:%i", buffer, conf->proxy.port);
error("Unable to connect to [%s]:%i", addr_buf, conf->proxy.port);
sprintf(err_msg, "Unable to connect to server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
goto proxy_err;
return -1;
}
if (sock_set_timeout(&proxy->proxy, SERVER_TIMEOUT) != 0) {
proxy_timeout_err:
res->status = http_get_status(500);
ctx->origin = INTERNAL;
error("Unable to set timeout for reverse proxy socket");
sprintf(err_msg, "Unable to set timeout for reverse proxy socket: %s", error_str(errno, err_buf, sizeof(err_buf)));
goto proxy_err;
return -1;
}
if (conf->proxy.enc) {
@ -386,6 +373,7 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
SSL_set_fd(proxy->proxy.ssl, proxy->proxy.socket);
SSL_set_connect_state(proxy->proxy.ssl);
int ret;
if ((ret = SSL_do_handshake(proxy->proxy.ssl)) != 1) {
sock_error(&proxy->proxy, (int) ret);
SSL_free(proxy->proxy.ssl);
@ -393,7 +381,7 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
ctx->origin = SERVER_REQ;
error("Unable to perform handshake");
sprintf(err_msg, "Unable to perform handshake: %s.", error_str(errno, err_buf, sizeof(err_buf)));
goto proxy_err;
return -1;
}
proxy->proxy.enc = 1;
}
@ -401,173 +389,196 @@ int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_statu
proxy->initialized = 1;
proxy->cnx_s = clock_micros();
proxy->host = conf->name;
info(BLUE_STR "Established new connection with " BLD_STR "[%s]:%i", buffer, conf->proxy.port);
info(BLUE_STR "Established new connection with " BLD_STR "[%s]:%i", addr_buf, conf->proxy.port);
proxy:
connection = http_get_header_field(&req->hdr, "Connection");
if (strcontains(connection, "upgrade") || strcontains(connection, "Upgrade")) {
upgrade = http_get_header_field(&req->hdr, "Upgrade");
ws_version = http_get_header_field(&req->hdr, "Sec-WebSocket-Version");
if (streq(upgrade, "websocket") && streq(ws_version, "13")) {
ctx->ws_key = http_get_header_field(&req->hdr, "Sec-WebSocket-Key");
return 0;
}
int proxy_init(proxy_ctx_t **proxy_ptr, http_req *req, http_res *res, http_status_ctx *ctx, host_config_t *conf, sock *client, http_status *custom_status, char *err_msg) {
char buffer[CHUNK_SIZE], err_buf[256];
long ret;
int tries = 0, retry = 1;
*proxy_ptr = proxy_get_by_conf(conf);
proxy_ctx_t *proxy = *proxy_ptr;
proxy->client = NULL;
while (retry) {
errno = 0;
if (!proxy->initialized || sock_has_pending(&proxy->proxy) != 0) {
if (proxy->initialized)
proxy_close(proxy);
retry = 0;
tries++;
if (proxy_connect(proxy, conf, res, ctx, err_msg) != 0)
continue;
}
const char *connection = http_get_header_field(&req->hdr, "Connection");
if (strcontains(connection, "upgrade") || strcontains(connection, "Upgrade")) {
const char *upgrade = http_get_header_field(&req->hdr, "Upgrade");
const char *ws_version = http_get_header_field(&req->hdr, "Sec-WebSocket-Version");
if (streq(upgrade, "websocket") && streq(ws_version, "13")) {
ctx->ws_key = http_get_header_field(&req->hdr, "Sec-WebSocket-Key");
} else {
res->status = http_get_status(501);
ctx->origin = INTERNAL;
return -1;
}
} else {
res->status = http_get_status(501);
http_remove_header_field(&req->hdr, "Connection", HTTP_REMOVE_ALL);
http_add_header_field(&req->hdr, "Connection", "keep-alive");
}
ret = proxy_request_header(req, client);
if (ret != 0) {
res->status = http_get_status(500);
ctx->origin = INTERNAL;
return -1;
}
} else {
http_remove_header_field(&req->hdr, "Connection", HTTP_REMOVE_ALL);
http_add_header_field(&req->hdr, "Connection", "keep-alive");
}
ret = proxy_request_header(req, client);
if (ret != 0) {
res->status = http_get_status(500);
ctx->origin = INTERNAL;
return -1;
}
ret = http_send_request(&proxy->proxy, req);
if (ret < 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_REQ;
error("Unable to send request to server (1)");
sprintf(err_msg, "Unable to send request to server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
retry = tries < 4;
goto proxy_err;
}
const char *content_length = http_get_header_field(&req->hdr, "Content-Length");
unsigned long content_len = content_length != NULL ? strtoul(content_length, NULL, 10) : 0;
const char *transfer_encoding = http_get_header_field(&req->hdr, "Transfer-Encoding");
ret = 0;
if (content_len > 0) {
ret = sock_splice(&proxy->proxy, client, buffer, sizeof(buffer), content_len);
} else if (strcontains(transfer_encoding, "chunked")) {
ret = sock_splice_chunked(&proxy->proxy, client, buffer, sizeof(buffer), SOCK_CHUNKED);
}
if (ret < 0 || (content_len != 0 && ret != content_len)) {
if (ret == -1 && errno != EPROTO) {
ret = http_send_request(&proxy->proxy, req);
if (ret < 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_REQ;
error("Unable to send request to server (2)");
error("Unable to send request to server (1)");
sprintf(err_msg, "Unable to send request to server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
retry = tries < 4;
goto proxy_err;
} else if (ret == -1) {
res->status = http_get_status(400);
ctx->origin = CLIENT_REQ;
error("Unable to receive request from client");
sprintf(err_msg, "Unable to receive request from client: %s.", error_str(errno, err_buf, sizeof(err_buf)));
continue;
}
const char *content_length = http_get_header_field(&req->hdr, "Content-Length");
unsigned long content_len = content_length != NULL ? strtoul(content_length, NULL, 10) : 0;
const char *transfer_encoding = http_get_header_field(&req->hdr, "Transfer-Encoding");
ret = 0;
if (content_len > 0) {
ret = sock_splice(&proxy->proxy, client, buffer, sizeof(buffer), content_len);
} else if (strcontains(transfer_encoding, "chunked")) {
ret = sock_splice_chunked(&proxy->proxy, client, buffer, sizeof(buffer), SOCK_CHUNKED);
}
if (ret < 0 || (content_len != 0 && ret != content_len)) {
if (ret == -1 && errno != EPROTO) {
res->status = http_get_status(502);
ctx->origin = SERVER_REQ;
error("Unable to send request to server (2)");
sprintf(err_msg, "Unable to send request to server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
retry = tries < 4;
continue;
} else if (ret == -1) {
res->status = http_get_status(400);
ctx->origin = CLIENT_REQ;
error("Unable to receive request from client");
sprintf(err_msg, "Unable to receive request from client: %s.", error_str(errno, err_buf, sizeof(err_buf)));
return -1;
}
res->status = http_get_status(500);
ctx->origin = INTERNAL;
error("Unknown Error");
return -1;
}
res->status = http_get_status(500);
ctx->origin = INTERNAL;
error("Unknown Error");
return -1;
}
ret = sock_recv(&proxy->proxy, buffer, sizeof(buffer) - 1, MSG_PEEK);
if (ret <= 0) {
int e_sys = error_get_sys(), e_ssl = error_get_ssl();
if (e_sys == EAGAIN || e_sys == EINPROGRESS || e_ssl == SSL_ERROR_WANT_READ || e_ssl == SSL_ERROR_WANT_WRITE) {
res->status = http_get_status(504);
ctx->origin = SERVER_RES;
} else {
ret = sock_recv(&proxy->proxy, buffer, sizeof(buffer) - 1, MSG_PEEK);
if (ret <= 0) {
int e_sys = error_get_sys(), e_ssl = error_get_ssl();
if (e_sys == EAGAIN || e_sys == EINPROGRESS || e_ssl == SSL_ERROR_WANT_READ || e_ssl == SSL_ERROR_WANT_WRITE) {
res->status = http_get_status(504);
ctx->origin = SERVER_RES;
} else {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
}
error("Unable to receive response from server");
sprintf(err_msg, "Unable to receive response from server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
retry = tries < 4;
continue;
}
buffer[ret] = 0;
char *buf = buffer;
unsigned short header_len = (unsigned short) (strstr(buffer, "\r\n\r\n") - buffer + 4);
if (header_len <= 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: End of header not found");
sprintf(err_msg, "Unable to parser header: End of header not found.");
continue;
}
error("Unable to receive response from server");
sprintf(err_msg, "Unable to receive response from server: %s.", error_str(errno, err_buf, sizeof(err_buf)));
retry = tries < 4;
goto proxy_err;
}
buffer[ret] = 0;
char *buf = buffer;
unsigned short header_len = (unsigned short) (strstr(buffer, "\r\n\r\n") - buffer + 4);
if (header_len <= 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: End of header not found");
sprintf(err_msg, "Unable to parser header: End of header not found.");
goto proxy_err;
}
for (int i = 0; i < header_len; i++) {
if ((buf[i] >= 0x00 && buf[i] <= 0x1F && buf[i] != '\r' && buf[i] != '\n') || buf[i] == 0x7F) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Header contains illegal characters");
sprintf(err_msg, "Unable to parse header: Header contains illegal characters.");
goto proxy_err;
for (int i = 0; i < header_len; i++) {
if ((buf[i] >= 0x00 && buf[i] <= 0x1F && buf[i] != '\r' && buf[i] != '\n') || buf[i] == 0x7F) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Header contains illegal characters");
sprintf(err_msg, "Unable to parse header: Header contains illegal characters.");
continue;
}
}
}
char *ptr = buf;
while (header_len != (ptr - buf)) {
char *pos0 = strstr(ptr, "\r\n");
if (pos0 == NULL) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Invalid header format");
sprintf(err_msg, "Unable to parse header: Invalid header format.");
goto proxy_err;
}
if (ptr == buf) {
if (!strstarts(ptr, "HTTP/")) {
char *ptr = buf;
while (header_len != (ptr - buf)) {
char *pos0 = strstr(ptr, "\r\n");
if (pos0 == NULL) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Invalid header format");
sprintf(err_msg, "Unable to parse header: Invalid header format.");
goto proxy_err;
continue;
}
int status_code = (int) strtol(ptr + 9, NULL, 10);
res->status = http_get_status(status_code);
if (res->status == NULL && status_code >= 100 && status_code <= 999) {
custom_status->code = status_code;
custom_status->type = 0;
snprintf(custom_status->msg, sizeof(custom_status->msg), "%.*s",
(int) (strchr(ptr, '\r') - ptr - 13), ptr + 13);
res->status = custom_status;
} else if (res->status == NULL) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Invalid or unknown status code");
sprintf(err_msg, "Unable to parse header: Invalid or unknown status code.");
goto proxy_err;
if (ptr == buf) {
if (!strstarts(ptr, "HTTP/")) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Invalid header format");
sprintf(err_msg, "Unable to parse header: Invalid header format.");
continue;
}
int status_code = (int) strtol(ptr + 9, NULL, 10);
res->status = http_get_status(status_code);
if (res->status == NULL && status_code >= 100 && status_code <= 999) {
custom_status->code = status_code;
custom_status->type = 0;
snprintf(custom_status->msg, sizeof(custom_status->msg), "%.*s",
(int) (strchr(ptr, '\r') - ptr - 13), ptr + 13);
res->status = custom_status;
} else if (res->status == NULL) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header: Invalid or unknown status code");
sprintf(err_msg, "Unable to parse header: Invalid or unknown status code.");
continue;
}
} else {
if (http_parse_header_field(&res->hdr, ptr, pos0, 0) != 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header");
sprintf(err_msg, "Unable to parse header.");
continue;
}
}
} else {
if (http_parse_header_field(&res->hdr, ptr, pos0, 0) != 0) {
res->status = http_get_status(502);
ctx->origin = SERVER_RES;
error("Unable to parse header");
sprintf(err_msg, "Unable to parse header.");
goto proxy_err;
if (pos0[2] == '\r' && pos0[3] == '\n') {
break;
}
ptr = pos0 + 2;
}
if (pos0[2] == '\r' && pos0[3] == '\n') {
break;
}
ptr = pos0 + 2;
}
sock_recv_x(&proxy->proxy, buffer, header_len, 0);
sock_recv_x(&proxy->proxy, buffer, header_len, 0);
ret = proxy_response_header(req, res, conf);
if (ret != 0) {
res->status = http_get_status(500);
ctx->origin = INTERNAL;
return -1;
ret = proxy_response_header(req, res, conf);
if (ret != 0) {
res->status = http_get_status(500);
ctx->origin = INTERNAL;
return -1;
}
return 0;
}
return 0;
proxy_err:
errno = 0;
if (retry) goto retry;
return -1;
}