add errors checks on strlcpy, fgets, use faster memmove to don't need buffer
This commit is contained in:
prx
Solene Rapenne
parent
e3448992bc
commit
8aa3acd2d4
59
main.c
59
main.c
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@ -2,6 +2,7 @@
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdio.h>
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@ -12,17 +13,18 @@
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#include "mimes.h"
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#define BUFF_LEN_2 1025
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#define BUFF_LEN_3 1024
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#define GEMINI_PART 9
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#define DEFAULT_LANG "en"
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#define DEFAULT_CHROOT "/var/gemini/"
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#define DEFAULT_CHROOT "/var/gemini"
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#define GEMINI_REQUEST_MAX 1024 /* see https://gemini.circumlunar.space/docs/specification.html */
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void display_file(const char *, const char *);
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void status (const int, const char *, const char *);
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void drop_privileges(const char *, const char *);
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void eunveil(const char *path, const char *permissions);
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size_t estrlcpy(char *dst, const char *src, size_t dstsize);
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void
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eunveil(const char *path, const char *permissions)
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@ -33,6 +35,19 @@ eunveil(const char *path, const char *permissions)
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}
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}
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size_t
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estrlcpy(char *dst, const char *src, size_t dstsize)
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{
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size_t n = 0;
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n = strlcpy(dst, src, dstsize);
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if (n >= dstsize) {
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err(1, "estrlcpy failed");
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}
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return n;
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}
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void
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drop_privileges(const char *user, const char *path)
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{
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@ -142,11 +157,10 @@ err:
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int
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main(int argc, char **argv)
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{
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char buffer [BUFF_LEN_2];
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char request [BUFF_LEN_2];
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char hostname [BUFF_LEN_2];
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char file [BUFF_LEN_2];
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char path [BUFF_LEN_2] = DEFAULT_CHROOT;
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char request [GEMINI_REQUEST_MAX] = {'\0'};
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char hostname [GEMINI_REQUEST_MAX] = {'\0'};
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char file [GEMINI_REQUEST_MAX] = {'\0'};
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char path [GEMINI_REQUEST_MAX] = DEFAULT_CHROOT;
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char lang [3] = DEFAULT_LANG;
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char user [_SC_LOGIN_NAME_MAX] = "";
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int virtualhost = 0;
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@ -158,16 +172,16 @@ main(int argc, char **argv)
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while ((option = getopt(argc, argv, ":d:l:u:v")) != -1) {
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switch (option) {
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case 'd':
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strlcpy(path, optarg, sizeof(path));
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estrlcpy(path, optarg, sizeof(path));
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break;
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case 'v':
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virtualhost = 1;
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break;
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case 'l':
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strlcpy(lang, optarg, sizeof(lang));
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estrlcpy(lang, optarg, sizeof(lang));
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break;
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case 'u':
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strlcpy(user, optarg, sizeof(user));
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estrlcpy(user, optarg, sizeof(user));
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chroot = 1;
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break;
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}
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@ -180,13 +194,17 @@ main(int argc, char **argv)
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/* change basedir to / to build the filepath if we use chroot */
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if (chroot == 1)
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strlcpy(path, "/", sizeof(path));
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estrlcpy(path, "/", sizeof(path));
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/*
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* read 1024 chars from stdin
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* to get the request
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*/
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fgets(request, BUFF_LEN_3, stdin);
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if (fgets(request, GEMINI_REQUEST_MAX, stdin) == NULL){
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/*TODO : add error code 5x */
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syslog(LOG_DAEMON, "request is too long (1024 max): %s", request);
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exit(1);
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}
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/* remove \r\n at the end of string */
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pos = strchr(request, '\r');
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@ -209,8 +227,7 @@ main(int argc, char **argv)
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syslog(LOG_DAEMON, "request %s", request);
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/* remove the gemini:// part */
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strlcpy(buffer, request + GEMINI_PART, sizeof(buffer) - GEMINI_PART);
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strlcpy(request, buffer, sizeof(request));
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memmove(request, request + GEMINI_PART, sizeof(request) - GEMINI_PART);
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/*
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* look for the first / after the hostname
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@ -230,8 +247,10 @@ main(int argc, char **argv)
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/* separate hostname and uri */
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if (position != -1) {
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strlcpy(hostname, request, position + 1);
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strlcpy(file, request + position + 1, sizeof(request));
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/*estrlcpy(hostname, request - position + 1, sizeof(request - position + 1));*/
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estrlcpy(file, request+position+1, sizeof(request+position+1));
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request[position +1] = '\0'; /* this is faster than strlcpy above*/
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/*
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* use a default file if no file are requested this
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@ -239,7 +258,7 @@ main(int argc, char **argv)
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* gemini://hostname/directory/
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*/
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if (strlen(file) == 0)
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strlcpy(file, "/index.gmi", 11);
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estrlcpy(file, "/index.gmi", 11);
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if (file[strlen(file) - 1] == '/')
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strlcat(file, "index.gmi", sizeof(file));
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@ -252,8 +271,8 @@ main(int argc, char **argv)
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* there are no slash / in the request
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* -2 to remove \r\n
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*/
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strlcpy(hostname, request, sizeof(hostname));
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strlcpy(file, "/index.gmi", 11);
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estrlcpy(hostname, request, sizeof(hostname));
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estrlcpy(file, "/index.gmi", 11);
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}
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/*
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