uclient.h

  1 /*
  2  * uclient - ustream based protocol client library
  3  *
  4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
  5  *
  6  * Permission to use, copy, modify, and/or distribute this software for any
  7  * purpose with or without fee is hereby granted, provided that the above
  8  * copyright notice and this permission notice appear in all copies.
  9  *
 10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17  */
 18 #ifndef __LIBUBOX_UCLIENT_H
 19 #define __LIBUBOX_UCLIENT_H
 20 
 21 #include <netinet/in.h>
 22 
 23 #include <libubox/blob.h>
 24 #include <libubox/ustream.h>
 25 #include <libubox/ustream-ssl.h>
 26 
 27 #define UCLIENT_DEFAULT_TIMEOUT_MS                      30000
 28 
 29 struct uclient_cb;
 30 struct uclient_backend;
 31 
 32 enum uclient_error_code {
 33         UCLIENT_ERROR_UNKNOWN,
 34         UCLIENT_ERROR_CONNECT,
 35         UCLIENT_ERROR_TIMEDOUT,
 36         UCLIENT_ERROR_SSL_INVALID_CERT,
 37         UCLIENT_ERROR_SSL_CN_MISMATCH,
 38         UCLIENT_ERROR_MISSING_SSL_CONTEXT,
 39         __UCLIENT_ERROR_MAX
 40 };
 41 
 42 enum uclient_log_type {
 43         UCLIENT_LOG_SSL_ERROR,
 44         UCLIENT_LOG_SSL_VERIFY_ERROR,
 45         __UCLIENT_LOG_MAX
 46 };
 47 
 48 union uclient_addr {
 49         struct sockaddr sa;
 50         struct sockaddr_in sin;
 51         struct sockaddr_in6 sin6;
 52 };
 53 
 54 struct uclient_url {
 55         const struct uclient_backend *backend;
 56         int prefix;
 57 
 58         const char *host;
 59         const char *port;
 60         const char *location;
 61 
 62         const char *auth;
 63 };
 64 
 65 struct uclient {
 66         const struct uclient_backend *backend;
 67         const struct uclient_cb *cb;
 68 
 69         union uclient_addr local_addr, remote_addr;
 70 
 71         struct uclient_url *proxy_url;
 72         struct uclient_url *url;
 73         int timeout_msecs;
 74         void *priv;
 75 
 76         bool eof;
 77         bool data_eof;
 78         int error_code;
 79         int status_code;
 80         struct blob_attr *meta;
 81 
 82         struct uloop_timeout connection_timeout;
 83         struct uloop_timeout read_notify;
 84         struct uloop_timeout timeout;
 85 };
 86 
 87 struct uclient_cb {
 88         void (*data_read)(struct uclient *cl);
 89         void (*data_sent)(struct uclient *cl);
 90         void (*data_eof)(struct uclient *cl);
 91         void (*header_done)(struct uclient *cl);
 92         void (*error)(struct uclient *cl, int code);
 93         void (*log_msg)(struct uclient *cl, enum uclient_log_type type, const char *msg);
 94 };
 95 
 96 struct uclient *uclient_new(const char *url, const char *auth_str, const struct uclient_cb *cb);
 97 void uclient_free(struct uclient *cl);
 98 
 99 int uclient_set_url(struct uclient *cl, const char *url, const char *auth);
100 int uclient_set_proxy_url(struct uclient *cl, const char *url_str, const char *auth_str);
101 
102 
103 /**
104  * Sets connection timeout.
105  *
106  * Provided timeout value will be used for:
107  * 1) Receiving HTTP response
108  * 2) Receiving data
109  *
110  * In case of timeout uclient will use error callback with
111  * UCLIENT_ERROR_TIMEDOUT code.
112  *
113  * @param msecs timeout in milliseconds
114  */
115 int uclient_set_timeout(struct uclient *cl, int msecs);
116 
117 int uclient_connect(struct uclient *cl);
118 void uclient_disconnect(struct uclient *cl);
119 
120 int uclient_read(struct uclient *cl, char *buf, int len);
121 int uclient_write(struct uclient *cl, const char *buf, int len);
122 int uclient_pending_bytes(struct uclient *cl, bool write);
123 int uclient_request(struct uclient *cl);
124 
125 char *uclient_get_addr(char *dest, int *port, union uclient_addr *a);
126 struct ustream_ssl_ctx *uclient_new_ssl_context(const struct ustream_ssl_ops **ops);
127 
128 /* HTTP */
129 extern const struct uclient_backend uclient_backend_http;
130 
131 int uclient_http_reset_headers(struct uclient *cl);
132 int uclient_http_set_header(struct uclient *cl, const char *name, const char *value);
133 int uclient_http_set_request_type(struct uclient *cl, const char *type);
134 int uclient_http_redirect(struct uclient *cl);
135 
136 static inline bool uclient_http_status_redirect(struct uclient *cl)
137 {
138         switch (cl->status_code) {
139         case 301:
140         case 302:
141         case 307:
142                 return true;
143         default:
144                 return false;
145         }
146 }
147 
148 int uclient_http_set_ssl_ctx(struct uclient *cl, const struct ustream_ssl_ops *ops,
149                              struct ustream_ssl_ctx *ctx, bool require_validation);
150 int uclient_http_set_address_family(struct uclient *cl, int af);
151 const char *uclient_strerror(unsigned err);
152 
153 #endif
154
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Sources/uclient/uclient.h
