/src/curl/lib/protocol.c

Source
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
#include "curl_setup.h"

#include "protocol.h"
#include "strcase.h"

#include "dict.h"
#include "file.h"
#include "ftp.h"
#include "gopher.h"
#include "http.h"
#include "imap.h"
#include "curl_ldap.h"
#include "mqtt.h"
#include "pop3.h"
#include "rtsp.h"
#include "smb.h"
#include "smtp.h"
#include "telnet.h"
#include "tftp.h"
#include "ws.h"
#include "vssh/ssh.h"


/* All URI schemes known to libcurl, but not necessarily implemented
 * by protocol handlers. */
const struct Curl_scheme Curl_scheme_dict = {
  "dict",                               /* scheme */
#ifdef CURL_DISABLE_DICT
  ZERO_NULL,
#else
  &Curl_protocol_dict,
#endif
  CURLPROTO_DICT,                       /* protocol */
  CURLPROTO_DICT,                       /* family */
  PROTOPT_NONE | PROTOPT_NOURLQUERY,    /* flags */
  PORT_DICT,                            /* defport */
};

const struct Curl_scheme Curl_scheme_file = {
  "file",                               /* scheme */
#ifdef CURL_DISABLE_FILE
  ZERO_NULL,
#else
  &Curl_protocol_file,
#endif
  CURLPROTO_FILE,                       /* protocol */
  CURLPROTO_FILE,                       /* family */
  PROTOPT_NONETWORK | PROTOPT_NOURLQUERY, /* flags */
  0                                     /* defport */
};

const struct Curl_scheme Curl_scheme_ftp = {
  "ftp",                           /* scheme */
#ifdef CURL_DISABLE_FTP
  ZERO_NULL,
#else
  &Curl_protocol_ftp,
#endif
  CURLPROTO_FTP,                   /* protocol */
  CURLPROTO_FTP,                   /* family */
  PROTOPT_DUAL | PROTOPT_CLOSEACTION | PROTOPT_NEEDSPWD |
  PROTOPT_NOURLQUERY | PROTOPT_PROXY_AS_HTTP |
  PROTOPT_WILDCARD | PROTOPT_SSL_REUSE |
  PROTOPT_CONN_REUSE, /* flags */
  PORT_FTP,                        /* defport */
};

const struct Curl_scheme Curl_scheme_ftps = {
  "ftps",                          /* scheme */
#if defined(CURL_DISABLE_FTP) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_ftp,
#endif
  CURLPROTO_FTPS,                  /* protocol */
  CURLPROTO_FTP,                   /* family */
  PROTOPT_SSL | PROTOPT_DUAL | PROTOPT_CLOSEACTION |
  PROTOPT_NEEDSPWD | PROTOPT_NOURLQUERY | PROTOPT_WILDCARD |
  PROTOPT_CONN_REUSE, /* flags */
  PORT_FTPS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_gopher = {
  "gopher",                             /* scheme */
#ifdef CURL_DISABLE_GOPHER
  ZERO_NULL,
#else
  &Curl_protocol_gopher,
#endif
  CURLPROTO_GOPHER,                     /* protocol */
  CURLPROTO_GOPHER,                     /* family */
  PROTOPT_NONE,                         /* flags */
  PORT_GOPHER,                          /* defport */
};

const struct Curl_scheme Curl_scheme_gophers = {
  "gophers",                            /* scheme */
#if defined(CURL_DISABLE_GOPHER) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_gophers,
#endif
  CURLPROTO_GOPHERS,                    /* protocol */
  CURLPROTO_GOPHER,                     /* family */
  PROTOPT_SSL,                          /* flags */
  PORT_GOPHER,                          /* defport */
};

const struct Curl_scheme Curl_scheme_http = {
  "http",                               /* scheme */
#ifdef CURL_DISABLE_HTTP
  ZERO_NULL,
#else
  &Curl_protocol_http,
#endif
  CURLPROTO_HTTP,                       /* protocol */
  CURLPROTO_HTTP,                       /* family */
  PROTOPT_CREDSPERREQUEST |             /* flags */
  PROTOPT_USERPWDCTRL | PROTOPT_CONN_REUSE,
  PORT_HTTP,                            /* defport */
};

const struct Curl_scheme Curl_scheme_https = {
  "https",                              /* scheme */
#if defined(CURL_DISABLE_HTTP) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_http,
#endif
  CURLPROTO_HTTPS,                      /* protocol */
  CURLPROTO_HTTP,                       /* family */
  PROTOPT_SSL | PROTOPT_CREDSPERREQUEST | PROTOPT_ALPN | /* flags */
  PROTOPT_USERPWDCTRL | PROTOPT_CONN_REUSE |
  PROTOPT_HTTP_PROXY_TUNNEL,
  PORT_HTTPS,                           /* defport */
};

const struct Curl_scheme Curl_scheme_imap = {
  "imap",                           /* scheme */
#ifdef CURL_DISABLE_IMAP
  ZERO_NULL,
#else
  &Curl_protocol_imap,
#endif
  CURLPROTO_IMAP,                   /* protocol */
  CURLPROTO_IMAP,                   /* family */
  PROTOPT_CLOSEACTION |             /* flags */
  PROTOPT_URLOPTIONS | PROTOPT_SSL_REUSE |
  PROTOPT_CONN_REUSE,
  PORT_IMAP,                        /* defport */
};

const struct Curl_scheme Curl_scheme_imaps = {
  "imaps",                          /* scheme */
#if defined(CURL_DISABLE_IMAP) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_imap,
#endif
  CURLPROTO_IMAPS,                  /* protocol */
  CURLPROTO_IMAP,                   /* family */
  PROTOPT_CLOSEACTION | PROTOPT_SSL | /* flags */
  PROTOPT_URLOPTIONS | PROTOPT_CONN_REUSE,
  PORT_IMAPS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_ldap = {
  "ldap",                               /* scheme */
#ifdef CURL_DISABLE_LDAP
  ZERO_NULL,
#else
  &Curl_protocol_ldap,
#endif
  CURLPROTO_LDAP,                       /* protocol */
  CURLPROTO_LDAP,                       /* family */
  PROTOPT_SSL_REUSE,                    /* flags */
  PORT_LDAP,                            /* defport */
};

const struct Curl_scheme Curl_scheme_ldaps = {
  "ldaps",                              /* scheme */
#if defined(CURL_DISABLE_LDAP) || !defined(HAVE_LDAP_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_ldap,
#endif
  CURLPROTO_LDAPS,                      /* protocol */
  CURLPROTO_LDAP,                       /* family */
  PROTOPT_SSL,                          /* flags */
  PORT_LDAPS,                           /* defport */
};

const struct Curl_scheme Curl_scheme_mqtt = {
  "mqtt",                             /* scheme */
#ifdef CURL_DISABLE_MQTT
  ZERO_NULL,
#else
  &Curl_protocol_mqtt,
#endif
  CURLPROTO_MQTT,                     /* protocol */
  CURLPROTO_MQTT,                     /* family */
  PROTOPT_NONE,                       /* flags */
  PORT_MQTT,                          /* defport */
};

const struct Curl_scheme Curl_scheme_mqtts = {
  "mqtts",                            /* scheme */
#if defined(CURL_DISABLE_MQTT) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_mqtts,
#endif
  CURLPROTO_MQTTS,                    /* protocol */
  CURLPROTO_MQTT,                     /* family */
  PROTOPT_SSL,                        /* flags */
  PORT_MQTTS,                         /* defport */
};

const struct Curl_scheme Curl_scheme_pop3 = {
  "pop3",                           /* scheme */
#ifdef CURL_DISABLE_POP3
  ZERO_NULL,
#else
  &Curl_protocol_pop3,
#endif
  CURLPROTO_POP3,                   /* protocol */
  CURLPROTO_POP3,                   /* family */
  PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY | /* flags */
  PROTOPT_URLOPTIONS | PROTOPT_SSL_REUSE | PROTOPT_CONN_REUSE,
  PORT_POP3,                        /* defport */
};

const struct Curl_scheme Curl_scheme_pop3s = {
  "pop3s",                          /* scheme */
#if defined(CURL_DISABLE_POP3) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_pop3,
#endif
  CURLPROTO_POP3S,                  /* protocol */
  CURLPROTO_POP3,                   /* family */
  PROTOPT_CLOSEACTION | PROTOPT_SSL | /* flags */
  PROTOPT_NOURLQUERY | PROTOPT_URLOPTIONS | PROTOPT_CONN_REUSE,
  PORT_POP3S,                       /* defport */
};

const struct Curl_scheme Curl_scheme_rtsp = {
  "rtsp",                               /* scheme */
#ifdef CURL_DISABLE_RTSP
  ZERO_NULL,
#else
  &Curl_protocol_rtsp,
#endif
  CURLPROTO_RTSP,                       /* protocol */
  CURLPROTO_RTSP,                       /* family */
  PROTOPT_CONN_REUSE,                   /* flags */
  PORT_RTSP,                            /* defport */
};

const struct Curl_scheme Curl_scheme_sftp = {
  "sftp",                               /* scheme */
#ifndef USE_SSH
  NULL,
#else
  &Curl_protocol_sftp,
#endif
  CURLPROTO_SFTP,                       /* protocol */
  CURLPROTO_SFTP,                       /* family */
  PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION | /* flags */
  PROTOPT_NOURLQUERY | PROTOPT_CONN_REUSE,
  PORT_SSH                              /* defport */
};

const struct Curl_scheme Curl_scheme_scp = {
  "scp",                                /* scheme */
#ifndef USE_SSH
  NULL,
#else
  &Curl_protocol_scp,
#endif
  CURLPROTO_SCP,                        /* protocol */
  CURLPROTO_SCP,                        /* family */
  PROTOPT_DIRLOCK | PROTOPT_CLOSEACTION | /* flags */
  PROTOPT_NOURLQUERY | PROTOPT_CONN_REUSE,
  PORT_SSH,                             /* defport */
};

const struct Curl_scheme Curl_scheme_smb = {
  "smb",                                /* scheme */
#if defined(CURL_ENABLE_SMB) && defined(USE_CURL_NTLM_CORE)
  &Curl_protocol_smb,
#else
  ZERO_NULL,
#endif
  CURLPROTO_SMB,                        /* protocol */
  CURLPROTO_SMB,                        /* family */
  PROTOPT_NONE,                         /* flags */
  PORT_SMB,                             /* defport */
};

const struct Curl_scheme Curl_scheme_smbs = {
  "smbs",                               /* scheme */
#if defined(CURL_ENABLE_SMB) && defined(USE_CURL_NTLM_CORE) && defined(USE_SSL)
  &Curl_protocol_smb,
#else
  ZERO_NULL,
#endif
  CURLPROTO_SMBS,                       /* protocol */
  CURLPROTO_SMB,                        /* family */
  PROTOPT_SSL,                          /* flags */
  PORT_SMBS,                            /* defport */
};

const struct Curl_scheme Curl_scheme_smtp = {
  "smtp",                           /* scheme */
#ifdef CURL_DISABLE_SMTP
  ZERO_NULL,
#else
  &Curl_protocol_smtp,
#endif
  CURLPROTO_SMTP,                   /* protocol */
  CURLPROTO_SMTP,                   /* family */
  PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY | /* flags */
  PROTOPT_URLOPTIONS | PROTOPT_SSL_REUSE | PROTOPT_CONN_REUSE,
  PORT_SMTP,                        /* defport */
};

const struct Curl_scheme Curl_scheme_smtps = {
  "smtps",                          /* scheme */
#if defined(CURL_DISABLE_SMTP) || !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_smtp,
#endif
  CURLPROTO_SMTPS,                  /* protocol */
  CURLPROTO_SMTP,                   /* family */
  PROTOPT_CLOSEACTION | PROTOPT_SSL | /* flags */
  PROTOPT_NOURLQUERY | PROTOPT_URLOPTIONS | PROTOPT_CONN_REUSE,
  PORT_SMTPS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_socks = {
  "socks",                          /* scheme */
  ZERO_NULL,
  CURLPROTO_SOCKS,                  /* protocol */
  CURLPROTO_SOCKS,                  /* family */
  PROTOPT_NO_TRANSFER,              /* flags */
  PORT_SOCKS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_socks4 = {
  "socks4",                         /* scheme */
  ZERO_NULL,
  CURLPROTO_SOCKS,                  /* protocol */
  CURLPROTO_SOCKS,                  /* family */
  PROTOPT_NO_TRANSFER,              /* flags */
  PORT_SOCKS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_socks4a = {
  "socks4a",                        /* scheme */
  ZERO_NULL,
  CURLPROTO_SOCKS,                  /* protocol */
  CURLPROTO_SOCKS,                  /* family */
  PROTOPT_NO_TRANSFER,              /* flags */
  PORT_SOCKS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_socks5 = {
  "socks5",                         /* scheme */
  ZERO_NULL,
  CURLPROTO_SOCKS,                  /* protocol */
  CURLPROTO_SOCKS,                  /* family */
  PROTOPT_NO_TRANSFER,              /* flags */
  PORT_SOCKS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_socks5h = {
  "socks5h",                         /* scheme */
  ZERO_NULL,
  CURLPROTO_SOCKS,                  /* protocol */
  CURLPROTO_SOCKS,                  /* family */
  PROTOPT_NO_TRANSFER,              /* flags */
  PORT_SOCKS,                       /* defport */
};

const struct Curl_scheme Curl_scheme_telnet = {
  "telnet",                             /* scheme */
#ifdef CURL_DISABLE_TELNET
  ZERO_NULL,
#else
  &Curl_protocol_telnet,
#endif
  CURLPROTO_TELNET,                     /* protocol */
  CURLPROTO_TELNET,                     /* family */
  PROTOPT_NONE | PROTOPT_NOURLQUERY,    /* flags */
  PORT_TELNET,                          /* defport */
};

const struct Curl_scheme Curl_scheme_tftp = {
  "tftp",                               /* scheme */
#ifdef CURL_DISABLE_TFTP
  ZERO_NULL,
#else
  &Curl_protocol_tftp,
#endif
  CURLPROTO_TFTP,                       /* protocol */
  CURLPROTO_TFTP,                       /* family */
  PROTOPT_NOTCPPROXY | PROTOPT_NOURLQUERY, /* flags */
  PORT_TFTP,                            /* defport */
};

const struct Curl_scheme Curl_scheme_ws = {
  "ws",                                 /* scheme */
#if defined(CURL_DISABLE_WEBSOCKETS) || defined(CURL_DISABLE_HTTP)
  ZERO_NULL,
#else
  &Curl_protocol_ws,
#endif
  CURLPROTO_WS,                         /* protocol */
  CURLPROTO_HTTP,                       /* family */
  PROTOPT_CREDSPERREQUEST |             /* flags */
  PROTOPT_USERPWDCTRL | PROTOPT_HTTP_PROXY_TUNNEL,
  PORT_HTTP                             /* defport */
};

const struct Curl_scheme Curl_scheme_wss = {
  "wss",                                /* scheme */
#if defined(CURL_DISABLE_WEBSOCKETS) || defined(CURL_DISABLE_HTTP) || \
  !defined(USE_SSL)
  ZERO_NULL,
#else
  &Curl_protocol_ws,
#endif
  CURLPROTO_WSS,                        /* protocol */
  CURLPROTO_HTTP,                       /* family */
  PROTOPT_SSL | PROTOPT_CREDSPERREQUEST | /* flags */
  PROTOPT_USERPWDCTRL | PROTOPT_HTTP_PROXY_TUNNEL,
  PORT_HTTPS                            /* defport */
};


static const struct Curl_scheme *two_letter_scheme(const char *scheme)
{
  if((Curl_raw_tolower(scheme[0]) == 'w') &&
     (Curl_raw_tolower(scheme[1]) == 's'))
    return &Curl_scheme_ws;
  return NULL;
}

static const struct Curl_scheme *three_letter_scheme(const char *scheme)
{
  char s0 = Curl_raw_tolower(scheme[0]);
  char s1 = Curl_raw_tolower(scheme[1]);
  char s2 = Curl_raw_tolower(scheme[2]);
  if(s0 == 'f') {
    if(s1 == 't' && s2 == 'p')
      return &Curl_scheme_ftp;
  }
  else if(s0 == 'w') {
    if(s1 == 's' && s2 == 's')
      return &Curl_scheme_wss;
  }
  else if(s0 == 's') {
    if(s1 == 'c' && s2 == 'p')
      return &Curl_scheme_scp;
    if(s1 == 'm' && s2 == 'b')
      return &Curl_scheme_smb;
  }
  return NULL;
}

static const struct Curl_scheme *four_letter_scheme(const char *scheme)
{
  char s0 = Curl_raw_tolower(scheme[0]);
  char s1 = Curl_raw_tolower(scheme[1]);
  char s2 = Curl_raw_tolower(scheme[2]);
  char s3 = Curl_raw_tolower(scheme[3]);
  if(s3 == 'p') {
    if(s0 == 'h') {
      if(s1 == 't' && s2 == 't')
        return &Curl_scheme_http;
    }
    else if(s0 == 'i') {
      if(s1 == 'm' && s2 == 'a')
        return &Curl_scheme_imap;
    }
    else if(s0 == 'l') {
      if(s1 == 'd' && s2 == 'a')
        return &Curl_scheme_ldap;
    }
    else if(s0 == 'r') {
      if(s1 == 't' && s2 == 's')
        return &Curl_scheme_rtsp;
    }
    else if(s0 == 't') {
      if(s1 == 'f' && s2 == 't')
        return &Curl_scheme_tftp;
    }
    else if(s0 == 's') {
      if(s1 == 'f' && s2 == 't')
        return &Curl_scheme_sftp;
      if(s1 == 'm' && s2 == 't')
        return &Curl_scheme_smtp;
    }
  }
  else if(s0 == 'f') {
    if(s1 == 't' && s2 == 'p' && s3 == 's')
      return &Curl_scheme_ftps;
    if(s1 == 'i' && s2 == 'l' && s3 == 'e')
      return &Curl_scheme_file;
  }
  else if(s0 == 'm') {
    if(s1 == 'q' && s2 == 't' && s3 == 't')
      return &Curl_scheme_mqtt;
  }
  else if(s0 == 'p') {
    if(s1 == 'o' && s2 == 'p' && s3 == '3')
      return &Curl_scheme_pop3;
  }
  else if(s0 == 'd') {
    if(s1 == 'i' && s2 == 'c' && s3 == 't')
      return &Curl_scheme_dict;
  }
  else if(s0 == 's') {
    if(s1 == 'm' && s2 == 'b' && s3 == 's')
      return &Curl_scheme_smbs;
  }
  return NULL;
}

static const struct Curl_scheme *five_letter_scheme(const char *scheme)
{
  char s4 = Curl_raw_tolower(scheme[4]);
  if(s4 == 's') {
    char s0 = Curl_raw_tolower(scheme[0]);
    char s1 = Curl_raw_tolower(scheme[1]);
    char s2 = Curl_raw_tolower(scheme[2]);
    char s3 = Curl_raw_tolower(scheme[3]);
    if(s3 == 'p') {
      switch(s0) {
      case 'h':
        if(s1 == 't' && s2 == 't')
          return &Curl_scheme_https;
        break;
      case 'l':
        if(s1 == 'd' && s2 == 'a')
          return &Curl_scheme_ldaps;
        break;
      case 'i':
        if(s1 == 'm' && s2 == 'a')
          return &Curl_scheme_imaps;
        break;
      case 's':
        if(s1 == 'm' && s2 == 't')
          return &Curl_scheme_smtps;
        break;
      default:
        break;
      }
    }
    else if(s0 == 'p') {
      if(s1 == 'o' && s2 == 'p' && s3 == '3')
        return &Curl_scheme_pop3s;
    }
    else if(s0 == 'm') {
      if(s1 == 'q' && s2 == 't' && s3 == 't')
        return &Curl_scheme_mqtts;
    }
    else if(s0 == 's') {
      if(s1 == 'o' && s2 == 'c' && s3 == 'k')
        return &Curl_scheme_socks;
    }
  }
  return NULL;
}

static const struct Curl_scheme *six_letter_scheme(const char *scheme)
{
  char s0 = Curl_raw_tolower(scheme[0]);
  switch(s0) {
  case 's':
    if(curl_strnequal("ocks4", &scheme[1], 5))
      return &Curl_scheme_socks4;
    if(curl_strnequal("ocks5", &scheme[1], 5))
      return &Curl_scheme_socks5;
    break;
  case 'g':
    if(curl_strnequal("opher", &scheme[1], 5))
      return &Curl_scheme_gopher;
    break;
  case 't':
    if(curl_strnequal("elnet", &scheme[1], 5))
      return &Curl_scheme_telnet;
    break;
  }
  return NULL;
}

static const struct Curl_scheme *seven_letter_scheme(const char *scheme)
{
  char s0 = Curl_raw_tolower(scheme[0]);
  if(s0 == 's') {
    if(curl_strnequal("ocks4a", &scheme[1], 6))
      return &Curl_scheme_socks4a;
    if(curl_strnequal("ocks5h", &scheme[1], 6))
      return &Curl_scheme_socks5h;
  }
  else if(s0 == 'g') {
    if(curl_strnequal("ophers", &scheme[1], 6))
      return &Curl_scheme_gophers;
  }
  return NULL;
}

/* Returns a struct scheme pointer if the name is a known scheme. Check the
   ->run struct field for non-NULL to figure out if an implementation is
   present. */
const struct Curl_scheme *Curl_getn_scheme(const char *scheme, size_t len)
{
  typedef const struct Curl_scheme *(*letterfunc)(const char *ptr);
  static const letterfunc parse[] = {
    two_letter_scheme,
    three_letter_scheme,
    four_letter_scheme,
    five_letter_scheme,
    six_letter_scheme,
    seven_letter_scheme
  };

  if(len < 2 || len > 7)
    return NULL;

  return parse[len - 2](scheme);
}

const struct Curl_scheme *Curl_get_scheme(const char *scheme)
{
  return Curl_getn_scheme(scheme, strlen(scheme));
}

Coverage Report

Created: 2026-08-31 06:47

Line	Count	Source
1		/***************************************************************************
2		* _ _ ____ _
3		* Project ___\| \| \| \| _ \\| \|
4		* / __\| \| \| \| \|_) \| \|
5		* \| (__\| \|_\| \| _ <\| \|___
6		* \___\|\___/\|_\| \_\_____\|
7		*
8		* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9		*
10		* This software is licensed as described in the file COPYING, which
11		* you should have received as part of this distribution. The terms
12		* are also available at https://curl.se/docs/copyright.html.
13		*
14		* You may opt to use, copy, modify, merge, publish, distribute and/or sell
15		* copies of the Software, and permit persons to whom the Software is
16		* furnished to do so, under the terms of the COPYING file.
17		*
18		* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19		* KIND, either express or implied.
20		*
21		* SPDX-License-Identifier: curl
22		*
23		***************************************************************************/
24		#include "curl_setup.h"
25
26		#include "protocol.h"
27		#include "strcase.h"
28
29		#include "dict.h"
30		#include "file.h"
31		#include "ftp.h"
32		#include "gopher.h"
33		#include "http.h"
34		#include "imap.h"
35		#include "curl_ldap.h"
36		#include "mqtt.h"
37		#include "pop3.h"
38		#include "rtsp.h"
39		#include "smb.h"
40		#include "smtp.h"
41		#include "telnet.h"
42		#include "tftp.h"
43		#include "ws.h"
44		#include "vssh/ssh.h"
45
46
47		/* All URI schemes known to libcurl, but not necessarily implemented
48		* by protocol handlers. */
49		const struct Curl_scheme Curl_scheme_dict = {
50		"dict", /* scheme */
51		#ifdef CURL_DISABLE_DICT
52		ZERO_NULL,
53		#else
54		&Curl_protocol_dict,
55		#endif
56		CURLPROTO_DICT, /* protocol */
57		CURLPROTO_DICT, /* family */
58		PROTOPT_NONE \| PROTOPT_NOURLQUERY, /* flags */
59		PORT_DICT, /* defport */
60		};
61
62		const struct Curl_scheme Curl_scheme_file = {
63		"file", /* scheme */
64		#ifdef CURL_DISABLE_FILE
65		ZERO_NULL,
66		#else
67		&Curl_protocol_file,
68		#endif
69		CURLPROTO_FILE, /* protocol */
70		CURLPROTO_FILE, /* family */
71		PROTOPT_NONETWORK \| PROTOPT_NOURLQUERY, /* flags */
72		0 /* defport */
73		};
74
75		const struct Curl_scheme Curl_scheme_ftp = {
76		"ftp", /* scheme */
77		#ifdef CURL_DISABLE_FTP
78		ZERO_NULL,
79		#else
80		&Curl_protocol_ftp,
81		#endif
82		CURLPROTO_FTP, /* protocol */
83		CURLPROTO_FTP, /* family */
84		PROTOPT_DUAL \| PROTOPT_CLOSEACTION \| PROTOPT_NEEDSPWD \|
85		PROTOPT_NOURLQUERY \| PROTOPT_PROXY_AS_HTTP \|
86		PROTOPT_WILDCARD \| PROTOPT_SSL_REUSE \|
87		PROTOPT_CONN_REUSE, /* flags */
88		PORT_FTP, /* defport */
89		};
90
91		const struct Curl_scheme Curl_scheme_ftps = {
92		"ftps", /* scheme */
93		#if defined(CURL_DISABLE_FTP) \|\| !defined(USE_SSL)
94		ZERO_NULL,
95		#else
96		&Curl_protocol_ftp,
97		#endif
98		CURLPROTO_FTPS, /* protocol */
99		CURLPROTO_FTP, /* family */
100		PROTOPT_SSL \| PROTOPT_DUAL \| PROTOPT_CLOSEACTION \|
101		PROTOPT_NEEDSPWD \| PROTOPT_NOURLQUERY \| PROTOPT_WILDCARD \|
102		PROTOPT_CONN_REUSE, /* flags */
103		PORT_FTPS, /* defport */
104		};
105
106		const struct Curl_scheme Curl_scheme_gopher = {
107		"gopher", /* scheme */
108		#ifdef CURL_DISABLE_GOPHER
109		ZERO_NULL,
110		#else
111		&Curl_protocol_gopher,
112		#endif
113		CURLPROTO_GOPHER, /* protocol */
114		CURLPROTO_GOPHER, /* family */
115		PROTOPT_NONE, /* flags */
116		PORT_GOPHER, /* defport */
117		};
118
119		const struct Curl_scheme Curl_scheme_gophers = {
120		"gophers", /* scheme */
121		#if defined(CURL_DISABLE_GOPHER) \|\| !defined(USE_SSL)
122		ZERO_NULL,
123		#else
124		&Curl_protocol_gophers,
125		#endif
126		CURLPROTO_GOPHERS, /* protocol */
127		CURLPROTO_GOPHER, /* family */
128		PROTOPT_SSL, /* flags */
129		PORT_GOPHER, /* defport */
130		};
131
132		const struct Curl_scheme Curl_scheme_http = {
133		"http", /* scheme */
134		#ifdef CURL_DISABLE_HTTP
135		ZERO_NULL,
136		#else
137		&Curl_protocol_http,
138		#endif
139		CURLPROTO_HTTP, /* protocol */
140		CURLPROTO_HTTP, /* family */
141		PROTOPT_CREDSPERREQUEST \| /* flags */
142		PROTOPT_USERPWDCTRL \| PROTOPT_CONN_REUSE,
143		PORT_HTTP, /* defport */
144		};
145
146		const struct Curl_scheme Curl_scheme_https = {
147		"https", /* scheme */
148		#if defined(CURL_DISABLE_HTTP) \|\| !defined(USE_SSL)
149		ZERO_NULL,
150		#else
151		&Curl_protocol_http,
152		#endif
153		CURLPROTO_HTTPS, /* protocol */
154		CURLPROTO_HTTP, /* family */
155		PROTOPT_SSL \| PROTOPT_CREDSPERREQUEST \| PROTOPT_ALPN \| /* flags */
156		PROTOPT_USERPWDCTRL \| PROTOPT_CONN_REUSE \|
157		PROTOPT_HTTP_PROXY_TUNNEL,
158		PORT_HTTPS, /* defport */
159		};
160
161		const struct Curl_scheme Curl_scheme_imap = {
162		"imap", /* scheme */
163		#ifdef CURL_DISABLE_IMAP
164		ZERO_NULL,
165		#else
166		&Curl_protocol_imap,
167		#endif
168		CURLPROTO_IMAP, /* protocol */
169		CURLPROTO_IMAP, /* family */
170		PROTOPT_CLOSEACTION \| /* flags */
171		PROTOPT_URLOPTIONS \| PROTOPT_SSL_REUSE \|
172		PROTOPT_CONN_REUSE,
173		PORT_IMAP, /* defport */
174		};
175
176		const struct Curl_scheme Curl_scheme_imaps = {
177		"imaps", /* scheme */
178		#if defined(CURL_DISABLE_IMAP) \|\| !defined(USE_SSL)
179		ZERO_NULL,
180		#else
181		&Curl_protocol_imap,
182		#endif
183		CURLPROTO_IMAPS, /* protocol */
184		CURLPROTO_IMAP, /* family */
185		PROTOPT_CLOSEACTION \| PROTOPT_SSL \| /* flags */
186		PROTOPT_URLOPTIONS \| PROTOPT_CONN_REUSE,
187		PORT_IMAPS, /* defport */
188		};
189
190		const struct Curl_scheme Curl_scheme_ldap = {
191		"ldap", /* scheme */
192		#ifdef CURL_DISABLE_LDAP
193		ZERO_NULL,
194		#else
195		&Curl_protocol_ldap,
196		#endif
197		CURLPROTO_LDAP, /* protocol */
198		CURLPROTO_LDAP, /* family */
199		PROTOPT_SSL_REUSE, /* flags */
200		PORT_LDAP, /* defport */
201		};
202
203		const struct Curl_scheme Curl_scheme_ldaps = {
204		"ldaps", /* scheme */
205		#if defined(CURL_DISABLE_LDAP) \|\| !defined(HAVE_LDAP_SSL)
206		ZERO_NULL,
207		#else
208		&Curl_protocol_ldap,
209		#endif
210		CURLPROTO_LDAPS, /* protocol */
211		CURLPROTO_LDAP, /* family */
212		PROTOPT_SSL, /* flags */
213		PORT_LDAPS, /* defport */
214		};
215
216		const struct Curl_scheme Curl_scheme_mqtt = {
217		"mqtt", /* scheme */
218		#ifdef CURL_DISABLE_MQTT
219		ZERO_NULL,
220		#else
221		&Curl_protocol_mqtt,
222		#endif
223		CURLPROTO_MQTT, /* protocol */
224		CURLPROTO_MQTT, /* family */
225		PROTOPT_NONE, /* flags */
226		PORT_MQTT, /* defport */
227		};
228
229		const struct Curl_scheme Curl_scheme_mqtts = {
230		"mqtts", /* scheme */
231		#if defined(CURL_DISABLE_MQTT) \|\| !defined(USE_SSL)
232		ZERO_NULL,
233		#else
234		&Curl_protocol_mqtts,
235		#endif
236		CURLPROTO_MQTTS, /* protocol */
237		CURLPROTO_MQTT, /* family */
238		PROTOPT_SSL, /* flags */
239		PORT_MQTTS, /* defport */
240		};
241
242		const struct Curl_scheme Curl_scheme_pop3 = {
243		"pop3", /* scheme */
244		#ifdef CURL_DISABLE_POP3
245		ZERO_NULL,
246		#else
247		&Curl_protocol_pop3,
248		#endif
249		CURLPROTO_POP3, /* protocol */
250		CURLPROTO_POP3, /* family */
251		PROTOPT_CLOSEACTION \| PROTOPT_NOURLQUERY \| /* flags */
252		PROTOPT_URLOPTIONS \| PROTOPT_SSL_REUSE \| PROTOPT_CONN_REUSE,
253		PORT_POP3, /* defport */
254		};
255
256		const struct Curl_scheme Curl_scheme_pop3s = {
257		"pop3s", /* scheme */
258		#if defined(CURL_DISABLE_POP3) \|\| !defined(USE_SSL)
259		ZERO_NULL,
260		#else
261		&Curl_protocol_pop3,
262		#endif
263		CURLPROTO_POP3S, /* protocol */
264		CURLPROTO_POP3, /* family */
265		PROTOPT_CLOSEACTION \| PROTOPT_SSL \| /* flags */
266		PROTOPT_NOURLQUERY \| PROTOPT_URLOPTIONS \| PROTOPT_CONN_REUSE,
267		PORT_POP3S, /* defport */
268		};
269
270		const struct Curl_scheme Curl_scheme_rtsp = {
271		"rtsp", /* scheme */
272		#ifdef CURL_DISABLE_RTSP
273		ZERO_NULL,
274		#else
275		&Curl_protocol_rtsp,
276		#endif
277		CURLPROTO_RTSP, /* protocol */
278		CURLPROTO_RTSP, /* family */
279		PROTOPT_CONN_REUSE, /* flags */
280		PORT_RTSP, /* defport */
281		};
282
283		const struct Curl_scheme Curl_scheme_sftp = {
284		"sftp", /* scheme */
285		#ifndef USE_SSH
286		NULL,
287		#else
288		&Curl_protocol_sftp,
289		#endif
290		CURLPROTO_SFTP, /* protocol */
291		CURLPROTO_SFTP, /* family */
292		PROTOPT_DIRLOCK \| PROTOPT_CLOSEACTION \| /* flags */
293		PROTOPT_NOURLQUERY \| PROTOPT_CONN_REUSE,
294		PORT_SSH /* defport */
295		};
296
297		const struct Curl_scheme Curl_scheme_scp = {
298		"scp", /* scheme */
299		#ifndef USE_SSH
300		NULL,
301		#else
302		&Curl_protocol_scp,
303		#endif
304		CURLPROTO_SCP, /* protocol */
305		CURLPROTO_SCP, /* family */
306		PROTOPT_DIRLOCK \| PROTOPT_CLOSEACTION \| /* flags */
307		PROTOPT_NOURLQUERY \| PROTOPT_CONN_REUSE,
308		PORT_SSH, /* defport */
309		};
310
311		const struct Curl_scheme Curl_scheme_smb = {
312		"smb", /* scheme */
313		#if defined(CURL_ENABLE_SMB) && defined(USE_CURL_NTLM_CORE)
314		&Curl_protocol_smb,
315		#else
316		ZERO_NULL,
317		#endif
318		CURLPROTO_SMB, /* protocol */
319		CURLPROTO_SMB, /* family */
320		PROTOPT_NONE, /* flags */
321		PORT_SMB, /* defport */
322		};
323
324		const struct Curl_scheme Curl_scheme_smbs = {
325		"smbs", /* scheme */
326		#if defined(CURL_ENABLE_SMB) && defined(USE_CURL_NTLM_CORE) && defined(USE_SSL)
327		&Curl_protocol_smb,
328		#else
329		ZERO_NULL,
330		#endif
331		CURLPROTO_SMBS, /* protocol */
332		CURLPROTO_SMB, /* family */
333		PROTOPT_SSL, /* flags */
334		PORT_SMBS, /* defport */
335		};
336
337		const struct Curl_scheme Curl_scheme_smtp = {
338		"smtp", /* scheme */
339		#ifdef CURL_DISABLE_SMTP
340		ZERO_NULL,
341		#else
342		&Curl_protocol_smtp,
343		#endif
344		CURLPROTO_SMTP, /* protocol */
345		CURLPROTO_SMTP, /* family */
346		PROTOPT_CLOSEACTION \| PROTOPT_NOURLQUERY \| /* flags */
347		PROTOPT_URLOPTIONS \| PROTOPT_SSL_REUSE \| PROTOPT_CONN_REUSE,
348		PORT_SMTP, /* defport */
349		};
350
351		const struct Curl_scheme Curl_scheme_smtps = {
352		"smtps", /* scheme */
353		#if defined(CURL_DISABLE_SMTP) \|\| !defined(USE_SSL)
354		ZERO_NULL,
355		#else
356		&Curl_protocol_smtp,
357		#endif
358		CURLPROTO_SMTPS, /* protocol */
359		CURLPROTO_SMTP, /* family */
360		PROTOPT_CLOSEACTION \| PROTOPT_SSL \| /* flags */
361		PROTOPT_NOURLQUERY \| PROTOPT_URLOPTIONS \| PROTOPT_CONN_REUSE,
362		PORT_SMTPS, /* defport */
363		};
364
365		const struct Curl_scheme Curl_scheme_socks = {
366		"socks", /* scheme */
367		ZERO_NULL,
368		CURLPROTO_SOCKS, /* protocol */
369		CURLPROTO_SOCKS, /* family */
370		PROTOPT_NO_TRANSFER, /* flags */
371		PORT_SOCKS, /* defport */
372		};
373
374		const struct Curl_scheme Curl_scheme_socks4 = {
375		"socks4", /* scheme */
376		ZERO_NULL,
377		CURLPROTO_SOCKS, /* protocol */
378		CURLPROTO_SOCKS, /* family */
379		PROTOPT_NO_TRANSFER, /* flags */
380		PORT_SOCKS, /* defport */
381		};
382
383		const struct Curl_scheme Curl_scheme_socks4a = {
384		"socks4a", /* scheme */
385		ZERO_NULL,
386		CURLPROTO_SOCKS, /* protocol */
387		CURLPROTO_SOCKS, /* family */
388		PROTOPT_NO_TRANSFER, /* flags */
389		PORT_SOCKS, /* defport */
390		};
391
392		const struct Curl_scheme Curl_scheme_socks5 = {
393		"socks5", /* scheme */
394		ZERO_NULL,
395		CURLPROTO_SOCKS, /* protocol */
396		CURLPROTO_SOCKS, /* family */
397		PROTOPT_NO_TRANSFER, /* flags */
398		PORT_SOCKS, /* defport */
399		};
400
401		const struct Curl_scheme Curl_scheme_socks5h = {
402		"socks5h", /* scheme */
403		ZERO_NULL,
404		CURLPROTO_SOCKS, /* protocol */
405		CURLPROTO_SOCKS, /* family */
406		PROTOPT_NO_TRANSFER, /* flags */
407		PORT_SOCKS, /* defport */
408		};
409
410		const struct Curl_scheme Curl_scheme_telnet = {
411		"telnet", /* scheme */
412		#ifdef CURL_DISABLE_TELNET
413		ZERO_NULL,
414		#else
415		&Curl_protocol_telnet,
416		#endif
417		CURLPROTO_TELNET, /* protocol */
418		CURLPROTO_TELNET, /* family */
419		PROTOPT_NONE \| PROTOPT_NOURLQUERY, /* flags */
420		PORT_TELNET, /* defport */
421		};
422
423		const struct Curl_scheme Curl_scheme_tftp = {
424		"tftp", /* scheme */
425		#ifdef CURL_DISABLE_TFTP
426		ZERO_NULL,
427		#else
428		&Curl_protocol_tftp,
429		#endif
430		CURLPROTO_TFTP, /* protocol */
431		CURLPROTO_TFTP, /* family */
432		PROTOPT_NOTCPPROXY \| PROTOPT_NOURLQUERY, /* flags */
433		PORT_TFTP, /* defport */
434		};
435
436		const struct Curl_scheme Curl_scheme_ws = {
437		"ws", /* scheme */
438		#if defined(CURL_DISABLE_WEBSOCKETS) \|\| defined(CURL_DISABLE_HTTP)
439		ZERO_NULL,
440		#else
441		&Curl_protocol_ws,
442		#endif
443		CURLPROTO_WS, /* protocol */
444		CURLPROTO_HTTP, /* family */
445		PROTOPT_CREDSPERREQUEST \| /* flags */
446		PROTOPT_USERPWDCTRL \| PROTOPT_HTTP_PROXY_TUNNEL,
447		PORT_HTTP /* defport */
448		};
449
450		const struct Curl_scheme Curl_scheme_wss = {
451		"wss", /* scheme */
452		#if defined(CURL_DISABLE_WEBSOCKETS) \|\| defined(CURL_DISABLE_HTTP) \|\| \
453		!defined(USE_SSL)
454		ZERO_NULL,
455		#else
456		&Curl_protocol_ws,
457		#endif
458		CURLPROTO_WSS, /* protocol */
459		CURLPROTO_HTTP, /* family */
460		PROTOPT_SSL \| PROTOPT_CREDSPERREQUEST \| /* flags */
461		PROTOPT_USERPWDCTRL \| PROTOPT_HTTP_PROXY_TUNNEL,
462		PORT_HTTPS /* defport */
463		};
464
465
466		static const struct Curl_scheme two_letter_scheme(const char scheme)
467	0	{
468	0	if((Curl_raw_tolower(scheme[0]) == 'w') &&
469	0	(Curl_raw_tolower(scheme[1]) == 's'))
470	0	return &Curl_scheme_ws;
471	0	return NULL;
472	0	}
473
474		static const struct Curl_scheme three_letter_scheme(const char scheme)
475	0	{
476	0	char s0 = Curl_raw_tolower(scheme[0]);
477	0	char s1 = Curl_raw_tolower(scheme[1]);
478	0	char s2 = Curl_raw_tolower(scheme[2]);
479	0	if(s0 == 'f') {
480	0	if(s1 == 't' && s2 == 'p')
481	0	return &Curl_scheme_ftp;
482	0	}
483	0	else if(s0 == 'w') {
484	0	if(s1 == 's' && s2 == 's')
485	0	return &Curl_scheme_wss;
486	0	}
487	0	else if(s0 == 's') {
488	0	if(s1 == 'c' && s2 == 'p')
489	0	return &Curl_scheme_scp;
490	0	if(s1 == 'm' && s2 == 'b')
491	0	return &Curl_scheme_smb;
492	0	}
493	0	return NULL;
494	0	}
495
496		static const struct Curl_scheme four_letter_scheme(const char scheme)
497	0	{
498	0	char s0 = Curl_raw_tolower(scheme[0]);
499	0	char s1 = Curl_raw_tolower(scheme[1]);
500	0	char s2 = Curl_raw_tolower(scheme[2]);
501	0	char s3 = Curl_raw_tolower(scheme[3]);
502	0	if(s3 == 'p') {
503	0	if(s0 == 'h') {
504	0	if(s1 == 't' && s2 == 't')
505	0	return &Curl_scheme_http;
506	0	}
507	0	else if(s0 == 'i') {
508	0	if(s1 == 'm' && s2 == 'a')
509	0	return &Curl_scheme_imap;
510	0	}
511	0	else if(s0 == 'l') {
512	0	if(s1 == 'd' && s2 == 'a')
513	0	return &Curl_scheme_ldap;
514	0	}
515	0	else if(s0 == 'r') {
516	0	if(s1 == 't' && s2 == 's')
517	0	return &Curl_scheme_rtsp;
518	0	}
519	0	else if(s0 == 't') {
520	0	if(s1 == 'f' && s2 == 't')
521	0	return &Curl_scheme_tftp;
522	0	}
523	0	else if(s0 == 's') {
524	0	if(s1 == 'f' && s2 == 't')
525	0	return &Curl_scheme_sftp;
526	0	if(s1 == 'm' && s2 == 't')
527	0	return &Curl_scheme_smtp;
528	0	}
529	0	}
530	0	else if(s0 == 'f') {
531	0	if(s1 == 't' && s2 == 'p' && s3 == 's')
532	0	return &Curl_scheme_ftps;
533	0	if(s1 == 'i' && s2 == 'l' && s3 == 'e')
534	0	return &Curl_scheme_file;
535	0	}
536	0	else if(s0 == 'm') {
537	0	if(s1 == 'q' && s2 == 't' && s3 == 't')
538	0	return &Curl_scheme_mqtt;
539	0	}
540	0	else if(s0 == 'p') {
541	0	if(s1 == 'o' && s2 == 'p' && s3 == '3')
542	0	return &Curl_scheme_pop3;
543	0	}
544	0	else if(s0 == 'd') {
545	0	if(s1 == 'i' && s2 == 'c' && s3 == 't')
546	0	return &Curl_scheme_dict;
547	0	}
548	0	else if(s0 == 's') {
549	0	if(s1 == 'm' && s2 == 'b' && s3 == 's')
550	0	return &Curl_scheme_smbs;
551	0	}
552	0	return NULL;
553	0	}
554
555		static const struct Curl_scheme five_letter_scheme(const char scheme)
556	0	{
557	0	char s4 = Curl_raw_tolower(scheme[4]);
558	0	if(s4 == 's') {
559	0	char s0 = Curl_raw_tolower(scheme[0]);
560	0	char s1 = Curl_raw_tolower(scheme[1]);
561	0	char s2 = Curl_raw_tolower(scheme[2]);
562	0	char s3 = Curl_raw_tolower(scheme[3]);
563	0	if(s3 == 'p') {
564	0	switch(s0) {
565	0	case 'h':
566	0	if(s1 == 't' && s2 == 't')
567	0	return &Curl_scheme_https;
568	0	break;
569	0	case 'l':
570	0	if(s1 == 'd' && s2 == 'a')
571	0	return &Curl_scheme_ldaps;
572	0	break;
573	0	case 'i':
574	0	if(s1 == 'm' && s2 == 'a')
575	0	return &Curl_scheme_imaps;
576	0	break;
577	0	case 's':
578	0	if(s1 == 'm' && s2 == 't')
579	0	return &Curl_scheme_smtps;
580	0	break;
581	0	default:
582	0	break;
583	0	}
584	0	}
585	0	else if(s0 == 'p') {
586	0	if(s1 == 'o' && s2 == 'p' && s3 == '3')
587	0	return &Curl_scheme_pop3s;
588	0	}
589	0	else if(s0 == 'm') {
590	0	if(s1 == 'q' && s2 == 't' && s3 == 't')
591	0	return &Curl_scheme_mqtts;
592	0	}
593	0	else if(s0 == 's') {
594	0	if(s1 == 'o' && s2 == 'c' && s3 == 'k')
595	0	return &Curl_scheme_socks;
596	0	}
597	0	}
598	0	return NULL;
599	0	}
600
601		static const struct Curl_scheme six_letter_scheme(const char scheme)
602	0	{
603	0	char s0 = Curl_raw_tolower(scheme[0]);
604	0	switch(s0) {
605	0	case 's':
606	0	if(curl_strnequal("ocks4", &scheme[1], 5))
607	0	return &Curl_scheme_socks4;
608	0	if(curl_strnequal("ocks5", &scheme[1], 5))
609	0	return &Curl_scheme_socks5;
610	0	break;
611	0	case 'g':
612	0	if(curl_strnequal("opher", &scheme[1], 5))
613	0	return &Curl_scheme_gopher;
614	0	break;
615	0	case 't':
616	0	if(curl_strnequal("elnet", &scheme[1], 5))
617	0	return &Curl_scheme_telnet;
618	0	break;
619	0	}
620	0	return NULL;
621	0	}
622
623		static const struct Curl_scheme seven_letter_scheme(const char scheme)
624	0	{
625	0	char s0 = Curl_raw_tolower(scheme[0]);
626	0	if(s0 == 's') {
627	0	if(curl_strnequal("ocks4a", &scheme[1], 6))
628	0	return &Curl_scheme_socks4a;
629	0	if(curl_strnequal("ocks5h", &scheme[1], 6))
630	0	return &Curl_scheme_socks5h;
631	0	}
632	0	else if(s0 == 'g') {
633	0	if(curl_strnequal("ophers", &scheme[1], 6))
634	0	return &Curl_scheme_gophers;
635	0	}
636	0	return NULL;
637	0	}
638
639		/* Returns a struct scheme pointer if the name is a known scheme. Check the
640		->run struct field for non-NULL to figure out if an implementation is
641		present. */
642		const struct Curl_scheme Curl_getn_scheme(const char scheme, size_t len)
643	0	{
644	0	typedef const struct Curl_scheme (letterfunc)(const char *ptr);
645	0	static const letterfunc parse[] = {
646	0	two_letter_scheme,
647	0	three_letter_scheme,
648	0	four_letter_scheme,
649	0	five_letter_scheme,
650	0	six_letter_scheme,
651	0	seven_letter_scheme
652	0	};
653
654	0	if(len < 2 \|\| len > 7)
655	0	return NULL;
656
657	0	return parse[len - 2](scheme);
658	0	}
659
660		const struct Curl_scheme Curl_get_scheme(const char scheme)
661	0	{
662	0	return Curl_getn_scheme(scheme, strlen(scheme));
663	0	}