/* * nghttp2 - HTTP/2.0 C Library * * Copyright (c) 2012 Tatsuhiro Tsujikawa * * 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 "nghttp2_helper.h" #include #include #include "nghttp2_net.h" void nghttp2_put_uint16be(uint8_t *buf, uint16_t n) { uint16_t x = htons(n); memcpy(buf, &x, sizeof(uint16_t)); } void nghttp2_put_uint32be(uint8_t *buf, uint32_t n) { uint32_t x = htonl(n); memcpy(buf, &x, sizeof(uint32_t)); } uint16_t nghttp2_get_uint16(const uint8_t *data) { uint16_t n; memcpy(&n, data, sizeof(uint16_t)); return ntohs(n); } uint32_t nghttp2_get_uint32(const uint8_t *data) { uint32_t n; memcpy(&n, data, sizeof(uint32_t)); return ntohl(n); } int nghttp2_reserve_buffer(uint8_t **buf_ptr, size_t *buflen_ptr, size_t min_length) { if(min_length > *buflen_ptr) { uint8_t *temp; min_length = (min_length+4095)/4096*4096; temp = realloc(*buf_ptr, min_length); if(temp == NULL) { return NGHTTP2_ERR_NOMEM; } else { *buf_ptr = temp; *buflen_ptr = min_length; } } return 0; } void* nghttp2_memdup(const void* src, size_t n) { void* dest = malloc(n); if(dest == NULL) { return NULL; } memcpy(dest, src, n); return dest; } void nghttp2_downcase(uint8_t *s, size_t len) { size_t i; for(i = 0; i < len; ++i) { if('A' <= s[i] && s[i] <= 'Z') { s[i] += 'a'-'A'; } } } int nghttp2_adjust_local_window_size(int32_t *local_window_size_ptr, int32_t *recv_window_size_ptr, int32_t *recv_reduction_ptr, int32_t *delta_ptr) { if(*delta_ptr > 0) { int32_t new_recv_window_size = nghttp2_max(0, *recv_window_size_ptr) - *delta_ptr; if(new_recv_window_size < 0) { /* The delta size is strictly more than received bytes. Increase local_window_size by that difference. */ int32_t recv_reduction_diff; if(*local_window_size_ptr > NGHTTP2_MAX_WINDOW_SIZE + new_recv_window_size) { return NGHTTP2_ERR_FLOW_CONTROL; } *local_window_size_ptr -= new_recv_window_size; /* If there is recv_reduction due to earlier window_size reduction, we have to adjust it too. */ recv_reduction_diff = nghttp2_min(*recv_reduction_ptr, -new_recv_window_size); *recv_reduction_ptr -= recv_reduction_diff; if(*recv_window_size_ptr < 0) { *recv_window_size_ptr += recv_reduction_diff; } else { /* If *recv_window_size_ptr > 0, then those bytes are considered to be backed to the remote peer (by WINDOW_UPDATE with the adjusted *delta_ptr), so it is effectively 0 now. */ *recv_window_size_ptr = recv_reduction_diff; } /* recv_reduction_diff must be paied from *delta_ptr, since it was added in window size reduction (see below). */ *delta_ptr -= recv_reduction_diff; } else { *recv_window_size_ptr = new_recv_window_size; } return 0; } else { if(*local_window_size_ptr + *delta_ptr < 0 || *recv_window_size_ptr < INT32_MIN - *delta_ptr || *recv_reduction_ptr > INT32_MAX + *delta_ptr) { return NGHTTP2_ERR_FLOW_CONTROL; } /* Decreasing local window size. Note that we achieve this without noticing to the remote peer. To do this, we cut recv_window_size by -delta. This means that we don't send WINDOW_UPDATE for -delta bytes. */ *local_window_size_ptr += *delta_ptr; *recv_window_size_ptr += *delta_ptr; *recv_reduction_ptr -= *delta_ptr; *delta_ptr = 0; } return 0; } int nghttp2_should_send_window_update(int32_t local_window_size, int32_t recv_window_size) { return recv_window_size >= local_window_size / 2; } static int VALID_HD_NAME_CHARS[] = { 0 /* NUL */, 0 /* SOH */, 0 /* STX */, 0 /* ETX */, 0 /* EOT */, 0 /* ENQ */, 0 /* ACK */, 0 /* BEL */, 0 /* BS */, 0 /* HT */, 0 /* LF */, 0 /* VT */, 0 /* FF */, 0 /* CR */, 0 /* SO */, 0 /* SI */, 0 /* DLE */, 0 /* DC1 */, 0 /* DC2 */, 0 /* DC3 */, 0 /* DC4 */, 0 /* NAK */, 0 /* SYN */, 0 /* ETB */, 0 /* CAN */, 0 /* EM */, 0 /* SUB */, 0 /* ESC */, 0 /* FS */, 0 /* GS */, 0 /* RS */, 0 /* US */, 0 /* SPC */, 1 /* ! */, 0 /* " */, 1 /* # */, 1 /* $ */, 1 /* % */, 1 /* & */, 1 /* ' */, 0 /* ( */, 0 /* ) */, 1 /* * */, 1 /* + */, 0 /* , */, 1 /* - */, 1 /* . */, 0 /* / */, 1 /* 0 */, 1 /* 1 */, 1 /* 2 */, 1 /* 3 */, 1 /* 4 */, 1 /* 5 */, 1 /* 6 */, 1 /* 7 */, 1 /* 8 */, 1 /* 9 */, 0 /* : */, 0 /* ; */, 0 /* < */, 0 /* = */, 0 /* > */, 0 /* ? */, 0 /* @ */, 0 /* A */, 0 /* B */, 0 /* C */, 0 /* D */, 0 /* E */, 0 /* F */, 0 /* G */, 0 /* H */, 0 /* I */, 0 /* J */, 0 /* K */, 0 /* L */, 0 /* M */, 0 /* N */, 0 /* O */, 0 /* P */, 0 /* Q */, 0 /* R */, 0 /* S */, 0 /* T */, 0 /* U */, 0 /* V */, 0 /* W */, 0 /* X */, 0 /* Y */, 0 /* Z */, 0 /* [ */, 0 /* \ */, 0 /* ] */, 1 /* ^ */, 1 /* _ */, 1 /* ` */, 1 /* a */, 1 /* b */, 1 /* c */, 1 /* d */, 1 /* e */, 1 /* f */, 1 /* g */, 1 /* h */, 1 /* i */, 1 /* j */, 1 /* k */, 1 /* l */, 1 /* m */, 1 /* n */, 1 /* o */, 1 /* p */, 1 /* q */, 1 /* r */, 1 /* s */, 1 /* t */, 1 /* u */, 1 /* v */, 1 /* w */, 1 /* x */, 1 /* y */, 1 /* z */, 0 /* { */, 1 /* | */, 0 /* } */, 1 /* ~ */, 0 /* DEL */, 0 /* 0x80 */, 0 /* 0x81 */, 0 /* 0x82 */, 0 /* 0x83 */, 0 /* 0x84 */, 0 /* 0x85 */, 0 /* 0x86 */, 0 /* 0x87 */, 0 /* 0x88 */, 0 /* 0x89 */, 0 /* 0x8a */, 0 /* 0x8b */, 0 /* 0x8c */, 0 /* 0x8d */, 0 /* 0x8e */, 0 /* 0x8f */, 0 /* 0x90 */, 0 /* 0x91 */, 0 /* 0x92 */, 0 /* 0x93 */, 0 /* 0x94 */, 0 /* 0x95 */, 0 /* 0x96 */, 0 /* 0x97 */, 0 /* 0x98 */, 0 /* 0x99 */, 0 /* 0x9a */, 0 /* 0x9b */, 0 /* 0x9c */, 0 /* 0x9d */, 0 /* 0x9e */, 0 /* 0x9f */, 0 /* 0xa0 */, 0 /* 0xa1 */, 0 /* 0xa2 */, 0 /* 0xa3 */, 0 /* 0xa4 */, 0 /* 0xa5 */, 0 /* 0xa6 */, 0 /* 0xa7 */, 0 /* 0xa8 */, 0 /* 0xa9 */, 0 /* 0xaa */, 0 /* 0xab */, 0 /* 0xac */, 0 /* 0xad */, 0 /* 0xae */, 0 /* 0xaf */, 0 /* 0xb0 */, 0 /* 0xb1 */, 0 /* 0xb2 */, 0 /* 0xb3 */, 0 /* 0xb4 */, 0 /* 0xb5 */, 0 /* 0xb6 */, 0 /* 0xb7 */, 0 /* 0xb8 */, 0 /* 0xb9 */, 0 /* 0xba */, 0 /* 0xbb */, 0 /* 0xbc */, 0 /* 0xbd */, 0 /* 0xbe */, 0 /* 0xbf */, 0 /* 0xc0 */, 0 /* 0xc1 */, 0 /* 0xc2 */, 0 /* 0xc3 */, 0 /* 0xc4 */, 0 /* 0xc5 */, 0 /* 0xc6 */, 0 /* 0xc7 */, 0 /* 0xc8 */, 0 /* 0xc9 */, 0 /* 0xca */, 0 /* 0xcb */, 0 /* 0xcc */, 0 /* 0xcd */, 0 /* 0xce */, 0 /* 0xcf */, 0 /* 0xd0 */, 0 /* 0xd1 */, 0 /* 0xd2 */, 0 /* 0xd3 */, 0 /* 0xd4 */, 0 /* 0xd5 */, 0 /* 0xd6 */, 0 /* 0xd7 */, 0 /* 0xd8 */, 0 /* 0xd9 */, 0 /* 0xda */, 0 /* 0xdb */, 0 /* 0xdc */, 0 /* 0xdd */, 0 /* 0xde */, 0 /* 0xdf */, 0 /* 0xe0 */, 0 /* 0xe1 */, 0 /* 0xe2 */, 0 /* 0xe3 */, 0 /* 0xe4 */, 0 /* 0xe5 */, 0 /* 0xe6 */, 0 /* 0xe7 */, 0 /* 0xe8 */, 0 /* 0xe9 */, 0 /* 0xea */, 0 /* 0xeb */, 0 /* 0xec */, 0 /* 0xed */, 0 /* 0xee */, 0 /* 0xef */, 0 /* 0xf0 */, 0 /* 0xf1 */, 0 /* 0xf2 */, 0 /* 0xf3 */, 0 /* 0xf4 */, 0 /* 0xf5 */, 0 /* 0xf6 */, 0 /* 0xf7 */, 0 /* 0xf8 */, 0 /* 0xf9 */, 0 /* 0xfa */, 0 /* 0xfb */, 0 /* 0xfc */, 0 /* 0xfd */, 0 /* 0xfe */, 0 /* 0xff */ }; static int check_header_name(const uint8_t *name, size_t len, int nocase) { const uint8_t *last; if(len == 0) { return 0; } if(*name == ':') { if(len == 1) { return 0; } ++name; --len; } for(last = name + len; name != last; ++name) { if(nocase && 'A' <= *name && *name <= 'Z') continue; if(!VALID_HD_NAME_CHARS[*name]) { return 0; } } return 1; } int nghttp2_check_header_name(const uint8_t *name, size_t len) { return check_header_name(name, len, 0); } int nghttp2_check_header_name_nocase(const uint8_t *name, size_t len) { return check_header_name(name, len, 1); } static int VALID_HD_VALUE_CHARS[] = { 1 /* NUL */, 0 /* SOH */, 0 /* STX */, 0 /* ETX */, 0 /* EOT */, 0 /* ENQ */, 0 /* ACK */, 0 /* BEL */, 0 /* BS */, 1 /* HT */, 0 /* LF */, 0 /* VT */, 0 /* FF */, 0 /* CR */, 0 /* SO */, 0 /* SI */, 0 /* DLE */, 0 /* DC1 */, 0 /* DC2 */, 0 /* DC3 */, 0 /* DC4 */, 0 /* NAK */, 0 /* SYN */, 0 /* ETB */, 0 /* CAN */, 0 /* EM */, 0 /* SUB */, 0 /* ESC */, 0 /* FS */, 0 /* GS */, 0 /* RS */, 0 /* US */, 1 /* SPC */, 1 /* ! */, 1 /* " */, 1 /* # */, 1 /* $ */, 1 /* % */, 1 /* & */, 1 /* ' */, 1 /* ( */, 1 /* ) */, 1 /* * */, 1 /* + */, 1 /* , */, 1 /* - */, 1 /* . */, 1 /* / */, 1 /* 0 */, 1 /* 1 */, 1 /* 2 */, 1 /* 3 */, 1 /* 4 */, 1 /* 5 */, 1 /* 6 */, 1 /* 7 */, 1 /* 8 */, 1 /* 9 */, 1 /* : */, 1 /* ; */, 1 /* < */, 1 /* = */, 1 /* > */, 1 /* ? */, 1 /* @ */, 1 /* A */, 1 /* B */, 1 /* C */, 1 /* D */, 1 /* E */, 1 /* F */, 1 /* G */, 1 /* H */, 1 /* I */, 1 /* J */, 1 /* K */, 1 /* L */, 1 /* M */, 1 /* N */, 1 /* O */, 1 /* P */, 1 /* Q */, 1 /* R */, 1 /* S */, 1 /* T */, 1 /* U */, 1 /* V */, 1 /* W */, 1 /* X */, 1 /* Y */, 1 /* Z */, 1 /* [ */, 1 /* \ */, 1 /* ] */, 1 /* ^ */, 1 /* _ */, 1 /* ` */, 1 /* a */, 1 /* b */, 1 /* c */, 1 /* d */, 1 /* e */, 1 /* f */, 1 /* g */, 1 /* h */, 1 /* i */, 1 /* j */, 1 /* k */, 1 /* l */, 1 /* m */, 1 /* n */, 1 /* o */, 1 /* p */, 1 /* q */, 1 /* r */, 1 /* s */, 1 /* t */, 1 /* u */, 1 /* v */, 1 /* w */, 1 /* x */, 1 /* y */, 1 /* z */, 1 /* { */, 1 /* | */, 1 /* } */, 1 /* ~ */, 0 /* DEL */, 1 /* 0x80 */, 1 /* 0x81 */, 1 /* 0x82 */, 1 /* 0x83 */, 1 /* 0x84 */, 1 /* 0x85 */, 1 /* 0x86 */, 1 /* 0x87 */, 1 /* 0x88 */, 1 /* 0x89 */, 1 /* 0x8a */, 1 /* 0x8b */, 1 /* 0x8c */, 1 /* 0x8d */, 1 /* 0x8e */, 1 /* 0x8f */, 1 /* 0x90 */, 1 /* 0x91 */, 1 /* 0x92 */, 1 /* 0x93 */, 1 /* 0x94 */, 1 /* 0x95 */, 1 /* 0x96 */, 1 /* 0x97 */, 1 /* 0x98 */, 1 /* 0x99 */, 1 /* 0x9a */, 1 /* 0x9b */, 1 /* 0x9c */, 1 /* 0x9d */, 1 /* 0x9e */, 1 /* 0x9f */, 1 /* 0xa0 */, 1 /* 0xa1 */, 1 /* 0xa2 */, 1 /* 0xa3 */, 1 /* 0xa4 */, 1 /* 0xa5 */, 1 /* 0xa6 */, 1 /* 0xa7 */, 1 /* 0xa8 */, 1 /* 0xa9 */, 1 /* 0xaa */, 1 /* 0xab */, 1 /* 0xac */, 1 /* 0xad */, 1 /* 0xae */, 1 /* 0xaf */, 1 /* 0xb0 */, 1 /* 0xb1 */, 1 /* 0xb2 */, 1 /* 0xb3 */, 1 /* 0xb4 */, 1 /* 0xb5 */, 1 /* 0xb6 */, 1 /* 0xb7 */, 1 /* 0xb8 */, 1 /* 0xb9 */, 1 /* 0xba */, 1 /* 0xbb */, 1 /* 0xbc */, 1 /* 0xbd */, 1 /* 0xbe */, 1 /* 0xbf */, 1 /* 0xc0 */, 1 /* 0xc1 */, 1 /* 0xc2 */, 1 /* 0xc3 */, 1 /* 0xc4 */, 1 /* 0xc5 */, 1 /* 0xc6 */, 1 /* 0xc7 */, 1 /* 0xc8 */, 1 /* 0xc9 */, 1 /* 0xca */, 1 /* 0xcb */, 1 /* 0xcc */, 1 /* 0xcd */, 1 /* 0xce */, 1 /* 0xcf */, 1 /* 0xd0 */, 1 /* 0xd1 */, 1 /* 0xd2 */, 1 /* 0xd3 */, 1 /* 0xd4 */, 1 /* 0xd5 */, 1 /* 0xd6 */, 1 /* 0xd7 */, 1 /* 0xd8 */, 1 /* 0xd9 */, 1 /* 0xda */, 1 /* 0xdb */, 1 /* 0xdc */, 1 /* 0xdd */, 1 /* 0xde */, 1 /* 0xdf */, 1 /* 0xe0 */, 1 /* 0xe1 */, 1 /* 0xe2 */, 1 /* 0xe3 */, 1 /* 0xe4 */, 1 /* 0xe5 */, 1 /* 0xe6 */, 1 /* 0xe7 */, 1 /* 0xe8 */, 1 /* 0xe9 */, 1 /* 0xea */, 1 /* 0xeb */, 1 /* 0xec */, 1 /* 0xed */, 1 /* 0xee */, 1 /* 0xef */, 1 /* 0xf0 */, 1 /* 0xf1 */, 1 /* 0xf2 */, 1 /* 0xf3 */, 1 /* 0xf4 */, 1 /* 0xf5 */, 1 /* 0xf6 */, 1 /* 0xf7 */, 1 /* 0xf8 */, 1 /* 0xf9 */, 1 /* 0xfa */, 1 /* 0xfb */, 1 /* 0xfc */, 1 /* 0xfd */, 1 /* 0xfe */, 1 /* 0xff */ }; int nghttp2_check_header_value(const uint8_t* value, size_t len) { const uint8_t *last; for(last = value + len; value != last; ++value) { if(!VALID_HD_VALUE_CHARS[*value]) { return 0; } } return 1; } const char* nghttp2_strerror(int error_code) { switch(error_code) { case 0: return "Success"; case NGHTTP2_ERR_INVALID_ARGUMENT: return "Invalid argument"; case NGHTTP2_ERR_UNSUPPORTED_VERSION: return "Unsupported SPDY version"; case NGHTTP2_ERR_WOULDBLOCK: return "Operation would block"; case NGHTTP2_ERR_PROTO: return "Protocol error"; case NGHTTP2_ERR_INVALID_FRAME: return "Invalid frame octets"; case NGHTTP2_ERR_EOF: return "EOF"; case NGHTTP2_ERR_DEFERRED: return "Data transfer deferred"; case NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE: return "No more Stream ID available"; case NGHTTP2_ERR_STREAM_CLOSED: return "Stream was already closed or invalid"; case NGHTTP2_ERR_STREAM_CLOSING: return "Stream is closing"; case NGHTTP2_ERR_STREAM_SHUT_WR: return "The transmission is not allowed for this stream"; case NGHTTP2_ERR_INVALID_STREAM_ID: return "Stream ID is invalid"; case NGHTTP2_ERR_INVALID_STREAM_STATE: return "Invalid stream state"; case NGHTTP2_ERR_DEFERRED_DATA_EXIST: return "Another DATA frame has already been deferred"; case NGHTTP2_ERR_START_STREAM_NOT_ALLOWED: return "request HEADERS is not allowed"; case NGHTTP2_ERR_GOAWAY_ALREADY_SENT: return "GOAWAY has already been sent"; case NGHTTP2_ERR_INVALID_HEADER_BLOCK: return "Invalid header block"; case NGHTTP2_ERR_INVALID_STATE: return "Invalid state"; case NGHTTP2_ERR_GZIP: return "Gzip error"; case NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE: return "The user callback function failed due to the temporal error"; case NGHTTP2_ERR_FRAME_SIZE_ERROR: return "The length of the frame is invalid"; case NGHTTP2_ERR_HEADER_COMP: return "Header compression/decompression error"; case NGHTTP2_ERR_NOMEM: return "Out of memory"; case NGHTTP2_ERR_CALLBACK_FAILURE: return "The user callback function failed"; default: return "Unknown error code"; } } void nghttp2_free(void *ptr) { free(ptr); }