mirror of
https://github.com/jart/cosmopolitan.git
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2046c0d2ae
- Expand redbean UNIX module - Expand redbean documentation - Ensure Lua copyright is embedded in binary - Increase the PATH_MAX limit especially on NT - Use column major sorting for linenoise completions - Fix some suboptimalities in redbean's new UNIX API - Figured out right flags for Multics newline in raw mode
109 lines
4.9 KiB
C
109 lines
4.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.internal.h"
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#include "libc/dns/servicestxt.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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/**
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* Opens and searches /etc/services to find name for a given port.
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*
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* The format of /etc/services is like this:
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*
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* # comment
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* # NAME PORT/PROTOCOL ALIASES
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* ftp 21/tcp
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* fsp 21/udp fspd
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* ssh 22/tcp
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*
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* @param servport is the port number
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* @param servproto is a NULL-terminated string (eg "tcp", "udp")
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* (if servproto is an empty string,
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* if is filled with the first matching
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* protocol)
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* @param servprotolen the size of servproto
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* @param buf is a buffer to store the official name of the service
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* @param bufsize is the size of buf
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* @param filepath is the location of the services file
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* (if NULL, uses /etc/services)
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* @return 0 on success, -1 on error
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* @note aliases are not read from the file.
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*/
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int LookupServicesByPort(const int servport, char *servproto,
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size_t servprotolen, char *buf, size_t bufsize,
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const char *filepath) {
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FILE *f;
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char *line;
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char pathbuf[PATH_MAX + 1];
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const char *path;
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size_t linesize;
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int found;
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char *name, *port, *proto, *comment, *tok;
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if (!(path = filepath)) {
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path = "/etc/services";
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if (IsWindows()) {
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path =
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firstnonnull(GetNtServicesTxtPath(pathbuf, ARRAYLEN(pathbuf)), path);
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}
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}
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if (servprotolen == 0 || bufsize == 0 || !(f = fopen(path, "r"))) {
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return -1;
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}
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line = NULL;
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linesize = 0;
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found = 0;
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strcpy(buf, "");
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while (found == 0 && (getline(&line, &linesize, f)) != -1) {
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if ((comment = strchr(line, '#'))) *comment = '\0';
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name = strtok_r(line, " \t\r\n\v", &tok);
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port = strtok_r(NULL, "/ \t\r\n\v", &tok);
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proto = strtok_r(NULL, " \t\r\n\v", &tok);
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if (name && port && proto && servport == atoi(port)) {
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if (!servproto[0] || strncasecmp(proto, servproto, servprotolen) == 0) {
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if (!servproto[0] && !memccpy(servproto, proto, '\0', servprotolen)) {
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strcpy(servproto, "");
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break;
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}
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if (!memccpy(buf, name, '\0', bufsize)) {
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strcpy(buf, "");
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break;
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}
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found = 1;
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}
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}
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}
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free(line);
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if (ferror(f)) {
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errno = ferror(f);
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return -1;
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}
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fclose(f);
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if (!found) return -1;
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return 0;
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}
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