/* * 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, 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; } 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[] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 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, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -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, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }; 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] == -1) { 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); } 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_TOO_LARGE: return "The length of the frame is too large"; 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"; } }