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https://github.com/jart/cosmopolitan.git
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9b29358511
Status lines for Emacs and Vim have been added to Python sources so they'll be easier to edit using Python's preferred coding style. Some DNS helper functions have been broken up into multiple files. It's nice to have one function per file whenever possible, since that way we don't need -ffunction-sections. Another reason it's good to have small source files, is because the build will be enforcing resource limits on compilation and testing soon.
108 lines
4.9 KiB
C
108 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];
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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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