| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include "http_parser.h" | ||
| 2 | #include <string.h> | ||
| 3 | #include <ctype.h> | ||
| 4 | |||
| 5 | static const size_t MAX_REQUEST_LINE = 2048; | ||
| 6 | |||
| 7 | 11 | int parse_http_request(char *buffer, size_t len, HttpRequest *req) { | |
| 8 | 11 | char *cursor = buffer; | |
| 9 | 11 | char *end = buffer + len; | |
| 10 | char *line_end; | ||
| 11 | |||
| 12 | // Parse the Request-Line: METHOD SP PATH SP VERSION CRLF | ||
| 13 | 11 | line_end = strstr(cursor, "\r\n"); | |
| 14 |
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11 | if (!line_end) return -1; |
| 15 |
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11 | if ((size_t)(line_end - cursor) > MAX_REQUEST_LINE) return -1; |
| 16 | 10 | *line_end = '\0'; | |
| 17 | |||
| 18 | // Extract the method | ||
| 19 | 10 | char *method = cursor; | |
| 20 | 10 | char *space = strchr(method, ' '); | |
| 21 |
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10 | if (!space) return -1; |
| 22 | 9 | *space = '\0'; | |
| 23 |
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9 | if (method[0] == '\0') return -1; |
| 24 |
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35 | for (char *p = method; *p; p++) { |
| 25 |
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27 | if (!isupper((unsigned char)*p)) return -1; |
| 26 | } | ||
| 27 | 8 | req->method = method; | |
| 28 | |||
| 29 | // Extract the path | ||
| 30 | 8 | char *path = space + 1; | |
| 31 | 8 | space = strchr(path, ' '); | |
| 32 |
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8 | if (!space) return -1; |
| 33 | 7 | *space = '\0'; | |
| 34 | 7 | req->path = path; | |
| 35 | |||
| 36 | // The rest is the HTTP version | ||
| 37 | 7 | char *version = space + 1; | |
| 38 | 7 | req->version = version; | |
| 39 |
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7 | if (strncmp(version, "HTTP/", 5) != 0) return -1; |
| 40 | |||
| 41 | // Move the cursor past the CRLF | ||
| 42 | 7 | cursor = line_end + 2; | |
| 43 | |||
| 44 | // Parse headers | ||
| 45 | 7 | req->header_count = 0; | |
| 46 |
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50 | while (cursor < end && !(cursor[0] == '\r' && cursor[1] == '\n')) { |
| 47 | 45 | line_end = strstr(cursor, "\r\n"); | |
| 48 |
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45 | if (!line_end) break; |
| 49 | 45 | *line_end = '\0'; | |
| 50 | |||
| 51 | // Find the ':' separator | ||
| 52 | 45 | char *colon = strchr(cursor, ':'); | |
| 53 |
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45 | if (!colon) return -1; |
| 54 | 45 | *colon = '\0'; | |
| 55 | 45 | char *field = cursor; | |
| 56 | 45 | char *value = colon + 1; | |
| 57 | |||
| 58 | // Remove any leading spaces in the value | ||
| 59 |
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90 | while (*value && isspace((unsigned char)*value)) value++; |
| 60 | |||
| 61 |
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45 | if (req->header_count >= MAX_HEADERS) return -1; |
| 62 | 43 | req->headers[req->header_count].field = field; | |
| 63 | 43 | req->headers[req->header_count].value = value; | |
| 64 | 43 | req->header_count++; | |
| 65 | |||
| 66 | 43 | cursor = line_end + 2; | |
| 67 | } | ||
| 68 | |||
| 69 | // The parser has also read the empty line separating headers and body | ||
| 70 | 5 | return 0; | |
| 71 | } | ||
| 72 |