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transmission/third-party/shttpd/defs.h

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/*
* Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
* All rights reserved
*
* "THE BEER-WARE LICENSE" (Revision 42):
* Sergey Lyubka wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return.
*/
#ifndef DEFS_HEADER_DEFINED
#define DEFS_HEADER_DEFINED
#include "std_includes.h"
#include "llist.h"
#include "io.h"
#include "shttpd.h"
#include "md5.h"
#include "config.h"
#define NELEMS(ar) (sizeof(ar) / sizeof(ar[0]))
#ifdef _DEBUG
#define DBG(x) do { printf x ; putchar('\n'); fflush(stdout); } while (0)
#else
#define DBG(x)
#endif /* DEBUG */
#ifdef EMBEDDED
#include "shttpd.h"
#endif /* EMBEDDED */
/*
* Darwin prior to 7.0 and Win32 do not have socklen_t
*/
#ifdef NO_SOCKLEN_T
typedef int socklen_t;
#endif /* NO_SOCKLEN_T */
/*
* For parsing. This guy represents a substring.
*/
struct vec {
const char *ptr;
int len;
};
#if !defined(_WIN32)
enum {FALSE, TRUE};
#endif /* _WIN32 */
enum {METHOD_GET, METHOD_POST, METHOD_PUT, METHOD_DELETE, METHOD_HEAD};
enum {HDR_DATE, HDR_INT, HDR_STRING}; /* HTTP header types */
enum {E_FATAL = 1, E_LOG = 2}; /* Flags for elog() function */
typedef unsigned long big_int_t; /* Type for Content-Length */
/*
* Unified socket address
*/
struct usa {
socklen_t len;
union {
struct sockaddr sa;
struct sockaddr_in sin;
} u;
};
/*
* This thing is aimed to hold values of any type.
* Used to store parsed headers' values.
*/
union variant {
char *v_str;
int v_int;
big_int_t v_big_int;
time_t v_time;
void (*v_func)(void);
void *v_void;
struct vec v_vec;
};
/*
* This is used only in embedded configuration. This structure holds a
* registered URI, associated callback function with callback data.
* For non-embedded compilation shttpd_callback_t is not defined, so
* we use union variant to keep the compiler silent.
*/
struct registered_uri {
struct llhead link;
const char *uri;
union variant callback;
void *callback_data;
};
/*
* User may want to handle certain errors. This structure holds the
* handlers for corresponding error codes.
*/
struct error_handler {
struct llhead link;
int code;
union variant callback;
void *callback_data;
};
struct http_header {
int len; /* Header name length */
int type; /* Header type */
size_t offset; /* Value placeholder */
const char *name; /* Header name */
};
/*
* This guy holds parsed HTTP headers
*/
struct headers {
union variant cl; /* Content-Length: */
union variant ct; /* Content-Type: */
union variant connection; /* Connection: */
union variant ims; /* If-Modified-Since: */
union variant user; /* Remote user name */
union variant auth; /* Authorization */
union variant useragent; /* User-Agent: */
union variant referer; /* Referer: */
union variant cookie; /* Cookie: */
union variant location; /* Location: */
union variant range; /* Range: */
union variant status; /* Status: */
union variant transenc; /* Transfer-Encoding: */
};
/* Must go after union variant definition */
#include "ssl.h"
/*
* The communication channel
*/
union channel {
int fd; /* Regular static file */
int sock; /* Connected socket */
struct {
int sock; /* XXX important. must be first */
SSL *ssl; /* shttpd_poll() assumes that */
} ssl; /* SSL-ed socket */
struct {
DIR *dirp;
char *path;
} dir; /* Opened directory */
struct {
void *state; /* For keeping state */
union variant func; /* User callback function */
void *data; /* User defined parameters */
} emb; /* Embedded, user callback */
};
struct stream;
/*
* IO class descriptor (file, directory, socket, SSL, CGI, etc)
* These classes are defined in io_*.c files.
*/
struct io_class {
const char *name;
int (*read)(struct stream *, void *buf, size_t len);
int (*write)(struct stream *, const void *buf, size_t len);
void (*close)(struct stream *);
};
/*
* Data exchange stream. It is backed by some communication channel:
* opened file, socket, etc. The 'read' and 'write' methods are
* determined by a communication channel.
*/
struct stream {
struct conn *conn;
union channel chan; /* Descriptor */
struct io io; /* IO buffer */
const struct io_class *io_class; /* IO class */
int nread_last; /* Bytes last read */
int headers_len;
big_int_t content_len;
unsigned int flags;
#define FLAG_HEADERS_PARSED 1
#define FLAG_SSL_ACCEPTED 2
#define FLAG_R 4 /* Can read in general */
#define FLAG_W 8 /* Can write in general */
#define FLAG_CLOSED 16
#define FLAG_DONT_CLOSE 32
#define FLAG_ALWAYS_READY 64 /* File, dir, user_func */
};
struct conn {
struct llhead link; /* Connections chain */
struct shttpd_ctx *ctx; /* Context this conn belongs to */
struct usa sa; /* Remote socket address */
time_t birth_time; /* Creation time */
time_t expire_time; /* Expiration time */
int loc_port; /* Local port */
int status; /* Reply status code */
int method; /* Request method */
char *uri; /* Decoded URI */
unsigned long major_version; /* Major HTTP version number */
unsigned long minor_version; /* Minor HTTP version number */
char *request; /* Request line */
char *headers; /* Request headers */
char *query; /* QUERY_STRING part of the URI */
char *path_info; /* PATH_INFO thing */
struct vec mime_type; /* Mime type */
struct headers ch; /* Parsed client headers */
struct stream loc; /* Local stream */
struct stream rem; /* Remote stream */
#if !defined(NO_SSI)
void *ssi; /* SSI descriptor */
#endif /* NO_SSI */
};
enum {
OPT_ROOT, OPT_INDEX_FILES, OPT_PORTS, OPT_DIR_LIST,
OPT_CGI_EXTENSIONS, OPT_CGI_INTERPRETER, OPT_CGI_ENVIRONMENT,
OPT_SSI_EXTENSIONS, OPT_AUTH_REALM, OPT_AUTH_GPASSWD,
OPT_AUTH_PUT, OPT_ACCESS_LOG, OPT_ERROR_LOG, OPT_MIME_TYPES,
OPT_SSL_CERTIFICATE, OPT_ALIASES, OPT_ACL, OPT_INETD, OPT_UID,
OPT_CFG_URI, OPT_PROTECT,
NUM_OPTIONS
};
/*
* SHTTPD context
*/
struct shttpd_ctx {
time_t start_time; /* Start time */
int nactive; /* # of connections now */
unsigned long nrequests; /* Requests made */
uint64_t in, out; /* IN/OUT traffic counters */
SSL_CTX *ssl_ctx; /* SSL context */
struct llhead connections; /* List of connections */
struct llhead registered_uris;/* User urls */
struct llhead error_handlers; /* Embedded error handlers */
struct llhead acl; /* Access control list */
struct llhead ssi_funcs; /* SSI callback functions */
struct llhead listeners; /* Listening sockets */
FILE *access_log; /* Access log stream */
FILE *error_log; /* Error log stream */
char *options[NUM_OPTIONS]; /* Configurable options */
#if defined(_WIN32)
CRITICAL_SECTION mutex; /* For MT case */
HANDLE ev[2]; /* For thread synchronization */
#elif defined(__rtems__)
rtems_id mutex;
#endif /* _WIN32 */
};
#define IS_TRUE(ctx, opt) ((ctx)->options[opt] && (ctx)->options[opt][0] =='1')
/*
* In SHTTPD, list of values are represented as comma or space separated
* string. For example, list of CGI extensions can be represented as
* ".cgi,.php,.pl", or ".cgi .php .pl". The macro that follows allows to
* loop through the individual values in that list.
*
* A "const char *" pointer and size_t variable must be passed to the macro.
* Spaces or commas can be used as delimiters (macro DELIM_CHARS).
*
* In every iteration of the loop, "s" points to the current value, and
* "len" specifies its length. The code inside loop must not change
* "s" and "len" parameters.
*/
#define FOR_EACH_WORD_IN_LIST(s,len) \
for (; s != NULL && (len = strcspn(s, DELIM_CHARS)) != 0; \
s += len, s+= strspn(s, DELIM_CHARS))
/*
* IPv4 ACL entry. Specifies subnet with deny/allow flag
*/
struct acl {
struct llhead link;
uint32_t ip; /* IP, in network byte order */
uint32_t mask; /* Also in network byte order */
int flag; /* Either '+' or '-' */
};
/*
* shttpd.c
*/
extern time_t current_time; /* Current UTC time */
extern int tz_offset; /* Offset from GMT time zone */
extern const struct vec known_http_methods[];
extern void stop_stream(struct stream *stream);
extern int url_decode(const char *, int, char *dst, int);
extern void send_server_error(struct conn *, int code, const char *reason);
extern int get_headers_len(const char *buf, size_t buflen);
extern void parse_headers(const char *s, int len, struct headers *parsed);
extern void open_listening_ports(struct shttpd_ctx *ctx);
extern void get_mime_type(struct shttpd_ctx *, const char *, int, struct vec *);
extern void free_list(struct llhead *head, void (*)(struct llhead *));
extern void registered_uri_destructor(struct llhead *);
extern void listener_destructor(struct llhead *);
/*
* config.c
*/
extern void usage(const char *prog);
/*
* log.c
*/
extern void elog(int flags, struct conn *c, const char *fmt, ...);
extern void log_access(FILE *fp, const struct conn *c);
/*
* string.c
*/
extern void my_strlcpy(register char *, register const char *, size_t);
extern int my_strncasecmp(register const char *,
register const char *, size_t);
extern char *my_strndup(const char *ptr, size_t len);
extern char *my_strdup(const char *str);
extern int my_snprintf(char *buf, size_t buflen, const char *fmt, ...);
extern int match_extension(const char *path, const char *ext_list);
/*
* compat_*.c
*/
extern void set_close_on_exec(int fd);
extern int set_non_blocking_mode(int fd);
extern int my_stat(const char *, struct stat *stp);
extern int my_open(const char *, int flags, int mode);
extern int my_remove(const char *);
extern int my_rename(const char *, const char *);
extern int my_mkdir(const char *, int);
extern char * my_getcwd(char *, int);
extern int spawn_process(struct conn *c, const char *prog,
char *envblk, char *envp[], int sock, const char *dir);
/*
* io_*.c
*/
extern const struct io_class io_file;
extern const struct io_class io_socket;
extern const struct io_class io_ssl;
extern const struct io_class io_cgi;
extern const struct io_class io_dir;
extern const struct io_class io_embedded;
extern const struct io_class io_ssi;
extern int put_dir(const char *path);
extern void get_dir(struct conn *c);
extern void get_file(struct conn *c, struct stat *stp);
extern void ssl_handshake(struct stream *stream);
extern void setup_embedded_stream(struct conn *, union variant, void *);
extern struct registered_uri *is_registered_uri(struct shttpd_ctx *,
const char *uri);
extern void do_ssi(struct conn *);
extern void ssi_func_destructor(struct llhead *lp);
/*
* auth.c
*/
extern int check_authorization(struct conn *c, const char *path);
extern int is_authorized_for_put(struct conn *c);
extern void send_authorization_request(struct conn *c);
extern int edit_passwords(const char *fname, const char *domain,
const char *user, const char *pass);
/*
* cgi.c
*/
extern int run_cgi(struct conn *c, const char *prog);
extern void do_cgi(struct conn *c);
#define CGI_REPLY "HTTP/1.1 OK\r\n"
#define CGI_REPLY_LEN (sizeof(CGI_REPLY) - 1)
#endif /* DEFS_HEADER_DEFINED */
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