mirror of https://github.com/omar-polo/gmid.git
282 lines
6.9 KiB
C
282 lines
6.9 KiB
C
/*
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* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef GMID_H
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#define GMID_H
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#include "config.h"
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <dirent.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <tls.h>
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#include <unistd.h>
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#include <openssl/x509.h>
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#define GEMINI_URL_LEN (1024+3) /* URL max len + \r\n + \0 */
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#define SUCCESS 20
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#define TEMP_REDIRECT 30
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#define TEMP_FAILURE 40
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#define CGI_ERROR 42
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#define NOT_FOUND 51
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#define PROXY_REFUSED 53
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#define BAD_REQUEST 59
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#define CLIENT_CERT_REQ 60
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#define CERT_NOT_AUTH 61
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#define MAX_USERS 64
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#define HOSTSLEN 64
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#define LOCLEN 32
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/* maximum hostname and label length, +1 for the NUL-terminator */
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#define DOMAIN_NAME_LEN (253+1)
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#define LABEL_LEN (63+1)
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struct location {
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const char *match;
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const char *lang;
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const char *default_mime;
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const char *index;
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int auto_index; /* 0 auto, -1 off, 1 on */
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int block_code;
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const char *block_fmt;
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int strip;
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X509_STORE *reqca;
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};
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struct vhost {
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const char *domain;
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const char *cert;
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const char *key;
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const char *dir;
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const char *cgi;
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const char *entrypoint;
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int dirfd;
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/* the first location rule is always '*' and holds the default
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* settings for the vhost, from locations[1] onwards there are
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* the "real" location rules specified in the configuration. */
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struct location locations[LOCLEN];
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};
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extern struct vhost hosts[HOSTSLEN];
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struct etm { /* extension to mime */
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const char *mime;
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const char *ext;
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};
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struct mime {
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struct etm *t;
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size_t len;
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size_t cap;
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};
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struct conf {
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/* from command line */
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int foreground;
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int verbose;
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/* in the config */
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int port;
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int ipv6;
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uint32_t protos;
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struct mime mime;
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char *chroot;
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char *user;
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int prefork;
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};
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extern const char *config_path;
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extern struct conf conf;
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extern int exfd;
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extern volatile sig_atomic_t hupped;
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struct iri {
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char *schema;
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char *host;
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char *port;
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uint16_t port_no;
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char *path;
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char *query;
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char *fragment;
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};
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struct parser {
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char *iri;
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struct iri *parsed;
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const char *err;
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};
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struct client;
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typedef void (*statefn)(int, short, void*);
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/*
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* DFA: handle_handshake is the initial state, close_conn the final.
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* Sometimes we have an enter_* function to handle the state switch.
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*
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* handle_handshake -> handle_open_conn
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* handle_handshake -> close_conn // on err
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*
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* handle_open_conn -> handle_cgi_reply // via open_file/dir/...
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* handle_open_conn -> handle_dirlist // ...same
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* handle_open_conn -> send_file // ...same
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* handle_open_conn -> start_reply // on error
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*
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* handle_cgi_reply -> handle_cgi // after logging the CGI reply
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* handle_cgi_reply -> start_reply // on error
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*
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* handle_cgi -> close_conn
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*
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* handle_dirlist -> send_directory_listing
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* handle_dirlist -> close_conn // on error
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*
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* send_directory_listing -> close_conn
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*
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* send_file -> close_conn
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*/
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struct client {
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struct tls *ctx;
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char req[GEMINI_URL_LEN];
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struct iri iri;
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char domain[DOMAIN_NAME_LEN];
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statefn next;
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int code;
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const char *meta;
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int fd, pfd;
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DIR *dir;
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char sbuf[1024];
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ssize_t len, off;
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struct sockaddr_storage addr;
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struct vhost *host; /* host she's talking to */
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};
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enum {
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FILE_EXISTS,
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FILE_EXECUTABLE,
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FILE_DIRECTORY,
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FILE_MISSING,
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};
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/* gmid.c */
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void sig_handler(int);
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void mkdirs(const char*);
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char *data_dir(void);
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void load_local_cert(const char*, const char*);
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void load_vhosts(void);
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int make_socket(int, int);
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void setup_tls(void);
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void init_config(void);
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void free_config(void);
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void drop_priv(void);
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/* provided by lex/yacc */
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extern FILE *yyin;
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extern int yylineno;
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extern int yyparse(void);
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extern int yylex(void);
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void yyerror(const char*, ...);
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int parse_portno(const char*);
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void parse_conf(const char*);
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/* log.c */
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void fatal(const char*, ...)
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__attribute__((format (printf, 1, 2)))
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__attribute__((__noreturn__));
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#define LOG_ATTR_FMT __attribute__((format (printf, 2, 3)))
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void log_err(struct client*, const char*, ...) LOG_ATTR_FMT;
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void log_warn(struct client*, const char*, ...) LOG_ATTR_FMT;
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void log_notice(struct client*, const char*, ...) LOG_ATTR_FMT;
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void log_info(struct client*, const char*, ...) LOG_ATTR_FMT;
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void log_debug(struct client*, const char*, ...) LOG_ATTR_FMT;
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void log_request(struct client*, char*, size_t);
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/* mime.c */
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void init_mime(struct mime*);
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void add_mime(struct mime*, const char*, const char*);
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void load_default_mime(struct mime*);
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const char *mime(struct vhost*, const char*);
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/* server.c */
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const char *vhost_lang(struct vhost*, const char*);
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const char *vhost_default_mime(struct vhost*, const char*);
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const char *vhost_index(struct vhost*, const char*);
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int vhost_auto_index(struct vhost*, const char*);
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int vhost_block_return(struct vhost*, const char*, int*, const char**);
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int vhost_strip(struct vhost*, const char*);
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X509_STORE *vhost_require_ca(struct vhost*, const char*);
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void mark_nonblock(int);
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void loop(struct tls*, int, int);
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/* ex.c */
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int send_string(int, const char*);
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int recv_string(int, char**);
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int send_iri(int, struct iri*);
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int recv_iri(int, struct iri*);
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void free_recvd_iri(struct iri*);
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int send_vhost(int, struct vhost*);
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int recv_vhost(int, struct vhost**);
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int send_time(int, time_t);
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int recv_time(int, time_t*);
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int send_fd(int, int);
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int recv_fd(int);
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int executor_main(void);
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/* sandbox.c */
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void sandbox(void);
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/* utf8.c */
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int valid_multibyte_utf8(struct parser*);
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char *utf8_nth(char*, size_t);
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/* iri.c */
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int parse_iri(char*, struct iri*, const char**);
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int trim_req_iri(char*, const char **);
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int serialize_iri(struct iri*, char*, size_t);
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char *pct_decode_str(char *);
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/* puny.c */
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int puny_decode(const char*, char*, size_t, const char**);
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/* utils.c */
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void block_signals(void);
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void unblock_signals(void);
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int starts_with(const char*, const char*);
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int ends_with(const char*, const char*);
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ssize_t filesize(int);
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char *absolutify_path(const char*);
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char *xstrdup(const char*);
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void gen_certificate(const char*, const char*, const char*);
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X509_STORE *load_ca(const char*);
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int validate_against_ca(X509_STORE*, const uint8_t*, size_t);
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#endif
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