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/*
* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef GMID_H
#define GMID_H
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <dirent.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <tls.h>
#include <unistd.h>
#include "config.h"
#ifndef INFTIM
# define INFTIM -1
#endif
#define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
/* large enough to hold a copy of a gemini URL and still have extra room */
#define PATHBUF 2048
#define SUCCESS 20
#define TEMP_REDIRECT 30
#define TEMP_FAILURE 40
#define NOT_FOUND 51
#define PROXY_REFUSED 53
#define BAD_REQUEST 59
#define MAX_USERS 64
#define HOSTSLEN 64
#define LOCLEN 32
/* RFC1034 imposes this limit. 63+1 for the NUL-terminator */
#define DOMAIN_NAME_LEN (63+1)
#define LOGE(c, fmt, ...) logs(LOG_ERR, c, fmt, __VA_ARGS__)
#define LOGW(c, fmt, ...) logs(LOG_WARNING, c, fmt, __VA_ARGS__)
#define LOGN(c, fmt, ...) logs(LOG_NOTICE, c, fmt, __VA_ARGS__)
#define LOGI(c, fmt, ...) logs(LOG_INFO, c, fmt, __VA_ARGS__)
#define LOGD(c, fmt, ...) logs(LOG_DEBUG, c, fmt, __VA_ARGS__)
struct location {
char *match;
char *lang;
char *default_mime;
char *index;
int auto_index; /* 0 auto, -1 off, 1 on */
};
struct vhost {
const char *domain;
const char *cert;
const char *key;
const char *dir;
const char *cgi;
int dirfd;
struct location locations[LOCLEN];
};
extern struct vhost hosts[HOSTSLEN];
struct etm { /* extension to mime */
const char *mime;
const char *ext;
};
struct mime {
struct etm *t;
size_t len;
size_t cap;
};
struct conf {
int port;
int ipv6;
uint32_t protos;
struct mime mime;
char *chroot;
char *user;
};
extern struct conf conf;
extern int exfd;
struct iri {
char *schema;
char *host;
char *port;
uint16_t port_no;
char *path;
char *query;
char *fragment;
};
struct parser {
char *iri;
struct iri *parsed;
const char *err;
};
enum {
S_HANDSHAKE,
S_OPEN,
S_INITIALIZING,
S_SENDING_FILE,
S_SENDING_DIR,
S_SENDING_CGI,
S_CLOSING,
};
struct client {
struct tls *ctx;
char req[GEMINI_URL_LEN];
struct iri iri;
char domain[DOMAIN_NAME_LEN];
int state, next;
int code;
const char *meta;
int fd, waiting_on_child;
char sbuf[1024]; /* static buffer */
void *buf, *i; /* mmap buffer */
ssize_t len, off; /* mmap/static buffer */
DIR *dir;
struct sockaddr_storage addr;
struct vhost *host; /* host she's talking to */
};
enum {
FILE_EXISTS,
FILE_EXECUTABLE,
FILE_DIRECTORY,
FILE_MISSING,
};
/* gmid.c */
__attribute__((format (printf, 1, 2)))
__attribute__((__noreturn__))
void fatal(const char*, ...);
__attribute__((format (printf, 3, 4)))
void logs(int, struct client*, const char*, ...);
void log_request(struct client*, char*, size_t);
void sig_handler(int);
int starts_with(const char*, const char*);
int ends_with(const char*, const char*);
ssize_t filesize(int);
char *absolutify_path(const char*);
void gen_certificate(const char*, const char*, const char*);
void mkdirs(const char*);
char *data_dir(void);
void load_local_cert(const char*, const char*);
void yyerror(const char*);
int parse_portno(const char*);
void parse_conf(const char*);
void load_vhosts(void);
int make_socket(int, int);
void setup_tls(void);
int listener_main(void);
void init_config(void);
void drop_priv(void);
void usage(const char*);
/* provided by lex/yacc */
extern FILE *yyin;
extern int yylineno;
extern int yyparse(void);
extern int yylex(void);
/* mime.c */
void init_mime(struct mime*);
void add_mime(struct mime*, const char*, const char*);
void load_default_mime(struct mime*);
const char *mime(struct vhost*, const char*);
/* server.c */
const char *vhost_lang(struct vhost*, const char*);
const char *vhost_default_mime(struct vhost*, const char*);
const char *vhost_index(struct vhost*, const char*);
int vhost_auto_index(struct vhost*, const char*);
int check_path(struct client*, const char*, int*);
void open_file(struct pollfd*, struct client*);
void load_file(struct pollfd*, struct client*);
void check_for_cgi(char *, char*, struct pollfd*, struct client*);
void mark_nonblock(int);
void handle_handshake(struct pollfd*, struct client*);
void handle_open_conn(struct pollfd*, struct client*);
void start_reply(struct pollfd*, struct client*, int, const char*);
void start_cgi(const char*, const char*, const char*, struct pollfd*, struct client*);
void send_file(struct pollfd*, struct client*);
void open_dir(struct pollfd*, struct client*);
void redirect_canonical_dir(struct pollfd*, struct client*);
int read_next_dir_entry(struct client*);
void send_directory_listing(struct pollfd*, struct client*);
void cgi_poll_on_child(struct pollfd*, struct client*);
void cgi_poll_on_client(struct pollfd*, struct client*);
void handle_cgi(struct pollfd*, struct client*);
void close_conn(struct pollfd*, struct client*);
void do_accept(int, struct tls*, struct pollfd*, struct client*);
void handle(struct pollfd*, struct client*);
void loop(struct tls*, int, int);
/* ex.c */
int send_string(int, const char*);
int recv_string(int, char**);
int send_vhost(int, struct vhost*);
int recv_vhost(int, struct vhost**);
int send_fd(int, int);
int recv_fd(int);
int executor_main(int);
/* sandbox.c */
void sandbox(void);
/* utf8.c */
int valid_multibyte_utf8(struct parser*);
char *utf8_nth(char*, size_t);
/* iri.c */
int parse_iri(char*, struct iri*, const char**);
int trim_req_iri(char*, const char **);
/* puny.c */
int puny_decode(const char*, char*, size_t);
#endif
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