/* Copyright Joyent, Inc. and other Node contributors. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ #include #include #include #define HTTP_PARSER_STRICT 1 #define LOWER(c) (unsigned char)(c | 0x20) #define IS_ALPHA(c) (LOWER(c) >= 'a' && LOWER(c) <= 'z') #define IS_NUM(c) ((c) >= '0' && (c) <= '9') #define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c)) #define IS_HEX(c) (IS_NUM(c) || (LOWER(c) >= 'a' && LOWER(c) <= 'f')) #define IS_MARK(c) ((c) == '-' || (c) == '_' || (c) == '.' || \ (c) == '!' || (c) == '~' || (c) == '*' || (c) == '\'' || (c) == '(' || \ (c) == ')') #define IS_USERINFO_CHAR(c) (IS_ALPHANUM(c) || IS_MARK(c) || (c) == '%' || \ (c) == ';' || (c) == ':' || (c) == '&' || (c) == '=' || (c) == '+' || \ (c) == '$' || (c) == ',') #ifndef BIT_AT # define BIT_AT(a, i) \ (!!((unsigned int) (a)[(unsigned int) (i) >> 3] & \ (1 << ((unsigned int) (i) & 7)))) #endif #if HTTP_PARSER_STRICT #define IS_URL_CHAR(c) (BIT_AT(normal_url_char, (unsigned char)c)) #define IS_HOST_CHAR(c) (IS_ALPHANUM(c) || (c) == '.' || (c) == '-') # define T(v) 0 #else #define IS_URL_CHAR(c) \ (BIT_AT(normal_url_char, (unsigned char)c) || ((c) & 0x80)) #define IS_HOST_CHAR(c) \ (IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_') # define T(v) v #endif static const uint8_t normal_url_char[32] = { /* 0 nul 1 soh 2 stx 3 etx 4 eot 5 enq 6 ack 7 bel */ 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, /* 8 bs 9 ht 10 nl 11 vt 12 np 13 cr 14 so 15 si */ 0 | T(2) | 0 | 0 | T(16) | 0 | 0 | 0, /* 16 dle 17 dc1 18 dc2 19 dc3 20 dc4 21 nak 22 syn 23 etb */ 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, /* 24 can 25 em 26 sub 27 esc 28 fs 29 gs 30 rs 31 us */ 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0, /* 32 sp 33 ! 34 " 35 # 36 $ 37 % 38 & 39 ' */ 0 | 2 | 4 | 0 | 16 | 32 | 64 | 128, /* 40 ( 41 ) 42 * 43 + 44 , 45 - 46 . 47 / */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 56 8 57 9 58 : 59 ; 60 < 61 = 62 > 63 ? */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 0, /* 64 @ 65 A 66 B 67 C 68 D 69 E 70 F 71 G */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 88 X 89 Y 90 Z 91 [ 92 \ 93 ] 94 ^ 95 _ */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 96 ` 97 a 98 b 99 c 100 d 101 e 102 f 103 g */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 104 h 105 i 106 j 107 k 108 l 109 m 110 n 111 o */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 112 p 113 q 114 r 115 s 116 t 117 u 118 v 119 w */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128, /* 120 x 121 y 122 z 123 { 124 | 125 } 126 ~ 127 del */ 1 | 2 | 4 | 8 | 16 | 32 | 64 | 0, }; #undef T enum http_host_state { s_http_host_dead = 1 , s_http_userinfo_start , s_http_userinfo , s_http_host_start , s_http_host_v6_start , s_http_host , s_http_host_v6 , s_http_host_v6_end , s_http_host_v6_zone_start , s_http_host_v6_zone , s_http_host_port_start , s_http_host_port }; enum state { s_dead = 1 /* important that this is > 0 */ , s_req_spaces_before_url , s_req_schema , s_req_schema_slash , s_req_schema_slash_slash , s_req_server_start , s_req_server , s_req_server_with_at , s_req_path , s_req_query_string_start , s_req_query_string , s_req_fragment_start , s_req_fragment }; /* Our URL parser. * * This is designed to be shared by http_parser_execute() for URL validation, * hence it has a state transition + byte-for-byte interface. In addition, it * is meant to be embedded in http_parser_parse_url(), which does the dirty * work of turning state transitions URL components for its API. * * This function should only be invoked with non-space characters. It is * assumed that the caller cares about (and can detect) the transition between * URL and non-URL states by looking for these. */ static enum state parse_url_char(enum state s, const char ch) { if (ch == ' ' || ch == '\r' || ch == '\n') { return s_dead; } #if HTTP_PARSER_STRICT if (ch == '\t' || ch == '\f') { return s_dead; } #endif switch (s) { case s_req_spaces_before_url: /* Proxied requests are followed by scheme of an absolute URI (alpha). * All methods except CONNECT are followed by '/' or '*'. */ if (ch == '/' || ch == '*') { return s_req_path; } if (IS_ALPHA(ch)) { return s_req_schema; } break; case s_req_schema: if (IS_ALPHA(ch)) { return s; } if (ch == ':') { return s_req_schema_slash; } break; case s_req_schema_slash: if (ch == '/') { return s_req_schema_slash_slash; } break; case s_req_schema_slash_slash: if (ch == '/') { return s_req_server_start; } break; case s_req_server_with_at: if (ch == '@') { return s_dead; } /* fall through */ case s_req_server_start: case s_req_server: if (ch == '/') { return s_req_path; } if (ch == '?') { return s_req_query_string_start; } if (ch == '@') { return s_req_server_with_at; } if (IS_USERINFO_CHAR(ch) || ch == '[' || ch == ']') { return s_req_server; } break; case s_req_path: if (IS_URL_CHAR(ch)) { return s; } switch (ch) { case '?': return s_req_query_string_start; case '#': return s_req_fragment_start; } break; case s_req_query_string_start: case s_req_query_string: if (IS_URL_CHAR(ch)) { return s_req_query_string; } switch (ch) { case '?': /* allow extra '?' in query string */ return s_req_query_string; case '#': return s_req_fragment_start; } break; case s_req_fragment_start: if (IS_URL_CHAR(ch)) { return s_req_fragment; } switch (ch) { case '?': return s_req_fragment; case '#': return s; } break; case s_req_fragment: if (IS_URL_CHAR(ch)) { return s; } switch (ch) { case '?': case '#': return s; } break; default: break; } /* We should never fall out of the switch above unless there's an error */ return s_dead; } void http_parser_url_init(struct http_parser_url *u) { memset(u, 0, sizeof(*u)); } static enum http_host_state http_parse_host_char(enum http_host_state s, const char ch) { switch(s) { case s_http_userinfo: case s_http_userinfo_start: if (ch == '@') { return s_http_host_start; } if (IS_USERINFO_CHAR(ch)) { return s_http_userinfo; } break; case s_http_host_start: if (ch == '[') { return s_http_host_v6_start; } if (IS_HOST_CHAR(ch)) { return s_http_host; } break; case s_http_host: if (IS_HOST_CHAR(ch)) { return s_http_host; } /* fall through */ case s_http_host_v6_end: if (ch == ':') { return s_http_host_port_start; } break; case s_http_host_v6: if (ch == ']') { return s_http_host_v6_end; } /* fall through */ case s_http_host_v6_start: if (IS_HEX(ch) || ch == ':' || ch == '.') { return s_http_host_v6; } if (s == s_http_host_v6 && ch == '%') { return s_http_host_v6_zone_start; } break; case s_http_host_v6_zone: if (ch == ']') { return s_http_host_v6_end; } /* fall through */ case s_http_host_v6_zone_start: /* RFC 6874 Zone ID consists of 1*( unreserved / pct-encoded) */ if (IS_ALPHANUM(ch) || ch == '%' || ch == '.' || ch == '-' || ch == '_' || ch == '~') { return s_http_host_v6_zone; } break; case s_http_host_port: case s_http_host_port_start: if (IS_NUM(ch)) { return s_http_host_port; } break; default: break; } return s_http_host_dead; } static int http_parse_host(const char * buf, struct http_parser_url *u, int found_at) { enum http_host_state s; const char *p; size_t buflen = u->field_data[UF_HOST].off + u->field_data[UF_HOST].len; if(!(u->field_set & (1 << UF_HOST))){ return 1; } u->field_data[UF_HOST].len = 0; s = found_at ? s_http_userinfo_start : s_http_host_start; for (p = buf + u->field_data[UF_HOST].off; p < buf + buflen; p++) { enum http_host_state new_s = http_parse_host_char(s, *p); if (new_s == s_http_host_dead) { return 1; } switch(new_s) { case s_http_host: if (s != s_http_host) { u->field_data[UF_HOST].off = (uint16_t)(p - buf); } u->field_data[UF_HOST].len++; break; case s_http_host_v6: if (s != s_http_host_v6) { u->field_data[UF_HOST].off = (uint16_t)(p - buf); } u->field_data[UF_HOST].len++; break; case s_http_host_v6_zone_start: case s_http_host_v6_zone: u->field_data[UF_HOST].len++; break; case s_http_host_port: if (s != s_http_host_port) { u->field_data[UF_PORT].off = (uint16_t)(p - buf); u->field_data[UF_PORT].len = 0; u->field_set |= (1 << UF_PORT); } u->field_data[UF_PORT].len++; break; case s_http_userinfo: if (s != s_http_userinfo) { u->field_data[UF_USERINFO].off = (uint16_t)(p - buf); u->field_data[UF_USERINFO].len = 0; u->field_set |= (1 << UF_USERINFO); } u->field_data[UF_USERINFO].len++; break; default: break; } s = new_s; } /* Make sure we don't end somewhere unexpected */ switch (s) { case s_http_host_start: case s_http_host_v6_start: case s_http_host_v6: case s_http_host_v6_zone_start: case s_http_host_v6_zone: case s_http_host_port_start: case s_http_userinfo: case s_http_userinfo_start: return 1; default: break; } return 0; } int http_parser_parse_url(const char *buf, size_t buflen, int is_connect, struct http_parser_url *u) { enum state s; const char *p; enum http_parser_url_fields uf, old_uf; int found_at = 0; if (buflen == 0) { return 1; } u->port = u->field_set = 0; s = is_connect ? s_req_server_start : s_req_spaces_before_url; old_uf = UF_MAX; for (p = buf; p < buf + buflen; p++) { s = parse_url_char(s, *p); /* Figure out the next field that we're operating on */ switch (s) { case s_dead: return 1; /* Skip delimeters */ case s_req_schema_slash: case s_req_schema_slash_slash: case s_req_server_start: case s_req_query_string_start: case s_req_fragment_start: continue; case s_req_schema: uf = UF_SCHEMA; break; case s_req_server_with_at: found_at = 1; /* fall through */ case s_req_server: uf = UF_HOST; break; case s_req_path: uf = UF_PATH; break; case s_req_query_string: uf = UF_QUERY; break; case s_req_fragment: uf = UF_FRAGMENT; break; default: return 1; } /* Nothing's changed; soldier on */ if (uf == old_uf) { u->field_data[uf].len++; continue; } u->field_data[uf].off = (uint16_t)(p - buf); u->field_data[uf].len = 1; u->field_set |= (1 << uf); old_uf = uf; } /* host must be present if there is a schema */ /* parsing http:///toto will fail */ if ((u->field_set & (1 << UF_SCHEMA)) && (u->field_set & (1 << UF_HOST)) == 0) { return 1; } if (u->field_set & (1 << UF_HOST)) { if (http_parse_host(buf, u, found_at) != 0) { return 1; } } /* CONNECT requests can only contain "hostname:port" */ if (is_connect && u->field_set != ((1 << UF_HOST)|(1 << UF_PORT))) { return 1; } if (u->field_set & (1 << UF_PORT)) { uint16_t off; uint16_t len; const char* i; const char* end; unsigned long v; off = u->field_data[UF_PORT].off; len = u->field_data[UF_PORT].len; end = buf + off + len; /* NOTE: The characters are already validated and are in the [0-9] range */ if((size_t) (off + len) > buflen) { return 1; } v = 0; for (i = buf + off; i < end; i++) { v *= 10; v += (unsigned long)(*i - '0'); /* Ports have a max value of 2^16 */ if (v > 0xffff) { return 1; } } u->port = (uint16_t) v; } return 0; }